研究者データベース
一川 尚広ICHIKAWA Takahiroイチカワ タカヒロ
| ■所属部署名 | 工学研究院 生命機能科学部門 | |||
| ■職名 | 教授 | |||
Last Updated :2025/09/03
業績情報
氏名・連絡先
氏名
イチカワ タカヒロ, 一川 尚広, ICHIKAWA Takahiro生年
1982
主たる所属・職名
工学研究院 生命機能科学部門, 教授
その他の所属
学歴
教育・研究活動状況
- ある種の両親媒性分子は自己組織的に様々なナノ構造を形成する。当研究室では、この自己組織化現象を自在に制御する分子設計技術の開発とそれを利用した超機能を追求しています。特に、エネルギー・環境分野に貢献するテクノロジーとして期待できます。
研究テーマ
科学研究費助成事業
- 国際共同研究加速基金（国際共同研究強化（B））
固体高分子電解質/電極界面設計技術を基盤とするフレキシブルLi金属二次電池の創出
自 2024年, 至 2024年 - 基盤研究(B)
水/イオン液体のLCST型相転移機構の解明とこの相転移を活用した凝集誘起機能制御
自 2024年, 至 2026年 - 国際共同研究加速基金（国際共同研究強化(B)）（令和３(2021)以降採択分）
固体高分子電解質/電極界面設計技術を基盤とするフレキシブルLi金属二次電池の創出
自 2023年, 至 2023年 - 挑戦的研究（萌芽）
中性子準弾性散乱測定を駆使した界面プロトンホッピング伝導機構の解明
自 2023年, 至 2024年 - 新学術領域研究（研究領域提案型）
三次元水ナノシートを用いたプロトン伝導パスの構築と伝導メカニズムの解明
自 2022年, 至 2023年 - 国際共同研究加速基金（国際共同研究強化(B)）
固体高分子電解質/電極界面設計技術を基盤とするフレキシブルLi金属二次電池の創出
自 2022年, 至 2022年 - 基盤研究(B)
三相界面の次元拡張を実現するジャイロイド構造膜の開発
自 2021年, 至 2023年 - 基盤研究(B)
三次元極小界面における脂質分子ダイナミクスの解明と革新的脂質キュービック法の開発
自 2017年, 至 2020年 - 若手研究(A)(一部基金)
Gyroid極小界面を用いたI/I3レドックス対伝導界面の構築
自 2013年, 至 2015年 - 若手研究(B)
キラルイオン液体の光学選択的溶媒和力を用いたキラル体分離膜の開発
自 2011年, 至 2012年 - 特別研究員奨励費
ナノ相分離構造を有するイオン機能性材料の構築
自 2008年, 至 2010年
論文
- Developing a fast estimation method for the pH in aqueous solutions made of ILs with protic constituents: The case of choline with amino acid and peptide anions
Lois Morandeira , Esther Guti´errez-Arnillas, Angeles Sanrom´an, Adilson Alves de Freitas, Jos´e N. Canongia Lopes, Takahiro Ichikawa, Karina Shimizu
Fluid Phase Equilibria
2025年05月20日, 研究論文（学術雑誌）, 共同, DOI(公開)(r-map) - Design of Functional Gyroid Minimal Surfaces Transporting Proton Based Solely on Surface Hopping Conduction Mechanism
Nanami Aoki, Yumin Tang, Xiangbing Zeng, and Takahiro Ichikawa
Macromolecular Rapid Communications
2024年11月03日, 研究論文（学術雑誌）, 共同, DOI(公開)(r-map) - Design of V-shaped ionic liquid crystals: atropisomerisation ability and formation of double-gyroid molecular assemblies
Takahiro Ichikawa, Soki Obara, Saori Yamaguchi, Yumin Tang, Toshiyo Kato and Xiangbing Zeng
CHEMICAL COMMUNICATIONS
ROYAL SOC CHEMISTRY
We designed V-shaped ionic liquid crystals with two sterically congested ionic parts at the vertex. Depending on the degree of steric hindrance, atropisomerisation occurred in solution. All compounds formed bicontinuous cubic phases with double-gyroid structures in the bulk state, partially owing to the co-existence of atropisomers with opposite chirality. We designed a series of V-shaped ionic liquid crystals with two sterically congested ionic parts at the vertex, which formed bicontinuous cubic phases with gyroid nanostructures.
2024年10月03日, 研究論文（学術雑誌）, 共同, 60, 80, 1359-7345, DOI(公開)(r-map) - Control of phase transition temperature of thermoresponsive poly(ionic liquid) gels and application to a water purification system using these gels with polydopamine
Takumi Takahashi, Takahiro Yoshida, Masaki Tanaka, Takahiro Ichikawa, Hiroyuki Ohno, Nobuhumi Nakamura
Separation and Purification Technology
ELSEVIER
Demand for purified water is increasing as the population grows. Water purification systems combining thermoresponsive materials and adsorbents that can be used in areas without electricity or other energy infrastructure have begun to be reported. The thermoresponsive hydrogel used in this system must be able to adsorb and desorb a large amount of water, react drastically to temperature, and have a phase transition temperature that can be easily changed depending on the environment in which it is used. In this study, thermoresponsive ionic liquid-derived polyelectrolyte gels (poly(IL) gels) were prepared as lower critical solution temperature (LCST)-type thermoresponsive materials. As a result, poly(IL) gel, which exhibits drastic swelling/shrinking and reversible adsorption/desorption of a large amount of water (44 times the amount of water to its own weight), was successfully fabricated. The phase transition temperature can be controlled between 20 degrees C and 35 degrees C by copolymerizing ILs with different structures. Then, polydopamine (PDA), which can serve as a photothermal conversion material as well as an adsorbent for contaminants, was polymerized on the surface of the poly(IL) gel. In addition to its role as an adsorbent, PDA can also serve as a photothermal conversion material. First, a poly (IL)-based material with PDA is swollen in contaminated water. Subsequent irradiation with sunlight induces an LCST-type phase transition behavior by converting light energy into heat. Finally, the contaminants remain adsorbed, and only the water is discharged from the material to obtain purified water. Using this material, we were able to show that organic dyes are removed from aqueous solutions with high efficiency using sunlight.
2024年06月13日, 研究論文（学術雑誌）, 共同, 337, 1383-5866, DOI(公開)(r-map) - Surface proton hopping conduction mechanism dominant polymer electrolytes created by self-assembly of bicontinuous cubic liquid crystals
Takahiro Ichikawa, Takeshi Yamada, Nanami Aoki, Yuki Maehara, Kaori Suda, and Tsubasa Kobayashi
CHEMICAL SCIENCE
ROYAL SOC CHEMISTRY
For the development of the next generation of fuel cells, it is essential to create an innovative design principle of polymer electrolytes that is beyond extension of the existing strategy. In the present study, we focused on the surface hopping proton conduction mechanism where an activation energy for proton conduction is greatly reduced by decreasing the distance between SO3- groups. Our gyroid nanostructured polymer film (Film-G), with a hydrophilic surface where the SO3- groups are aligned densely and precisely, shows high proton conductivity of the order of 10-2 S cm-1 when the water content is about 15 wt%. We reveal that the high proton conductivity of Film-G is attributed to the exhibition of an extremely-fast surface hopping conduction mechanism due to the reduced activation energy barrier along the gyroid minimal surface. This finding should introduce a game-changing novel opportunity in polymer electrolyte design. Ultrafast surface proton hopping conduction was achieved in a gyroid nanostructured polymer films having a 3D continuous interface where sulfonate groups are aligned densely and periodically.
2024年05月15日, 研究論文（学術雑誌）, 共同, 15, 19, 2041-6520, DOI(公開)(r-map) - Thermally Reversible On-Off Switching of Aggregation-Induced Emission via LCST Phase Transition of Ionic Liquids in Water
Iwasawa, Hironobu; Uchida, Daisuke; Hara, Yoichi; Tanaka, Masaki; Nakamura, Nobuhumi; Ohno, Hiroyuki; Ichikawa, Takahiro
ADVANCED OPTICAL MATERIALS
WILEY-V C H VERLAG GMBH
A new phosphonium-based ionic liquid is designed and synthesized using the 1,1,2,2-tetraphenylethene-derived anion ([P-4444](4)[TSPE]). Aqueous solutions of [P-4444](4)[TSPE] are obtained as transparent liquids (monophasic state), which suspended with increasing temperature. This behavior is found to exhibit a lower critical solution temperature (LCST) phase transition behavior. The LCST phase transition temperature can be controlled from 36 to 55 & DEG;C by changing the weight ratio between [P-4444](4)[TSPE] and water. When observing the LCST phase transition behavior of aqueous solutions of [P-4444](4)[TSPE] under excitation light with a wavelength of 365 nm, negligible photoluminescence in the monophasic state is observed at room temperature. Conversely, strong photoluminescence is observed in the suspended state when the temperature is above the LCST phase transition temperature. This strong photoluminescence is attributed to aggregation-induced emission (AIE) that is induced by the restriction of the intramolecular rotations of the 4-sulfophenyl groups against the ethylene core in the [TSPE] anion. This behavior is thermally reversible. This is the first example of on-off switching of AIE achieved using the LCST behavior of ionic liquids.
2023年10月, 研究論文（学術雑誌）, 共同, 11, 20, 2195-1071, DOI(公開)(r-map) - Thermally Reversible On-Off Switching of Aggregation-Induced Emission via LCST Phase Transition of Ionic Liquids in Water
Hironobu Iwasawa, Daisuke Uchida, Yoichi Hara, Masaki Tanaka, Nobuhumi Nakamura, Hiroyuki Ohno, Takahiro Ichikawa
Advanced Optical Materials
2023年08月03日, 研究論文（学術雑誌）, 共同, DOI(公開)(r-map) - Chromonic Ionic Liquid Crystals Forming Nematic and Hexagonal Columnar Phases
Ichikawa, Takahiro; Kuwana, Mei; Suda, Kaori
CRYSTALS
MDPI
We designed an ionic salt by combining a pi-conjugated anion and a cholinium cation. It formed homogeneous mixtures with water in various weight ratios. The obtained mixtures showed chromonic liquid-crystalline behavior in a wider concentration range as compared to analogous compounds with inorganic cations. Although only an exhibition of nematic phases was previously reported by Kasianova et al. for analogous compounds with an inorganic cation in 2010, the ionic salt with a cholinium cation showed not only nematic phases but also hexagonal columnar phases. The formation of hexagonal columnar phases is attributed to its ability to form mesophases even in a high concentration range, which enables the cylindrical aggregates of the pi-conjugated anions to form dense packing. By examining the states of the water molecules, we revealed that the ability of the cholinium cation to form a hydrated ionic liquid state strongly contributes to the widening of the concentration range forming chromonic liquid-crystalline behavior.
2022年11月, 研究論文（学術雑誌）, 共同, 12, 11, DOI(公開)(r-map) - Molecular design of a series of gemini-type zwitterionic amphiphiles with various linker lengths: control of their self-organisation for developing gyroid nanostructured proton conductive membranes
Hikaru Oshiro, Tsubasa Kobayashi and Takahiro Ichikawa
Molecular Systems Design & Engineering
ROYAL SOC CHEMISTRY
The development of advanced proton-conductive membranes is considered a significant challenge in fuel cell technology. To induce high proton conductivity (10(-2)-10(-1) S cm(-1)), it is important to construct a macroscopically continuous pathway for protons in the membranes. Recently, we successfully created gyroid nanostructured polymer films with a three-dimensional continuous proton conductive pathway, which exhibited high ionic conductivity on the order of 10(-5)-10(-1) S cm(-1) depending on the water content. These films were prepared by self-organisation of gemini-type zwitterionic amphiphiles with polymerisable groups into bicontinuous cubic phases in the presence of appropriate amounts of acid, HTf2N, and water, followed by in situ polymerisation. Herein, we investigated the effects of the n values of the -(CH2)(n)- linker in gemini-type zwitterionic amphiphiles on bicontinuous cubic phases. Results revealed that n = 4-6 was suitable for designing gemini-type zwitterionic amphiphiles that can form bicontinuous cubic phases. Moreover, we successfully developed a new method to change the mesophase pattern of mixtures of these zwitterionic amphiphiles and HTf2N from smectic to bicontinuous cubic phases by placing them under controlled relative humidity conditions. Using this method, a gyroid nanostructured polymer film was successfully obtained from a gemini-type zwitterionic amphiphile with polymerisable groups. A high ionic conductivity of 1.8 x 10(-2) S cm(-1) was observed when the water content in the film was 13.3 wt%. The present study is expected to provide important insights into the next-generation design of proton-conductive membranes with innovative functions and properties.
2022年10月31日, 研究論文（学術雑誌）, 共同, 7, 11, 2058-9689, DOI(公開)(r-map), 1459, 1466 - イオン結合をデザインする
一川尚広、大野弘幸
化学と教育
2021年07月20日, （MISC）総説・解説（学術雑誌）, 共同, 69, 7, 300, 303 - Gyroid-Nanostructured All-Solid Polymer Films Combining High H+ Conductivity with Low H-2 Permeability
Kobayashi, Tsubasa; Li, Ya-xin; Hirota, Yuichiro; Maekawa, Asako; Nishiyama, Norikazu; Zeng, Xiang-bing; Ichikawa, Takahiro
MACROMOLECULAR RAPID COMMUNICATIONS
WILEY-V C H VERLAG GMBH
Gyroid-nanostructured all-solid polymer films with exceedingly high proton conductivity and low H-2 gas permeability have been created via crosslinking polymerization of mixtures of a zwitterionic amphiphilic monomer and a polymerizable imide-type acid that co-organize into bicontinuous cubic liquid-crystalline phases. The gyroid nanostructures are visualized by reconstructing a 3D electron map from the synchrotron X-ray diffraction patterns. These films exhibit high proton conductivity of the order of 10(-1) S cm(-1) and extremely low H-2 gas permeability of the order of 10(-15) mol m m(-2) s(-1) Pa-1. These properties can be ascribed to the presence of the ionic liquid-like layer along the gyroid minimal surface. Since these two characteristics are required for improving the performance of proton-exchange membrane fuel cells, the present membrane design represents a promising strategy for the development of advanced devices, pertinent to establishing sustainable energy sources.
2021年06月, 研究論文（学術雑誌）, 共同, 42, 12, 1022-1336, DOI(公開)(r-map), 2100115 - Creation of Gyroid Nanostructured Polymer Films from Lyotropic Liquid Crystals Containing a Polymerizable Ionic Liquid as a Solvent
Chem. Lett.
2021年05月27日, 研究論文（学術雑誌）, 共同, 50, 6, DOI(公開)(r-map), 1198, 1201 - Thermally Responsive Poly(ethylene oxide)-Based Polyrotaxanes Bearing Hydrogen-Bonding Pillar[5]arene Rings**
Kato, Kenichi; Onishi, Katsuto; Maeda, Koki; Yagyu, Masafumi; Fa, Shixin; Ichikawa, Takahiro; Mizuno, Motohiro; Kakuta, Takahiro; Yamagishi, Tada-Aki; Ogoshi, Tomoki
CHEMISTRY-A EUROPEAN JOURNAL
WILEY-V C H VERLAG GMBH
Poly(ethylene oxide)s (PEOs) are useful polymers with good water solubility, biological compatibility, and commercial availability. PEOs with various end groups were threaded into pillar[5]arene rings in a mixture of water and methanol to afford pseudopolyrotaxanes. Corresponding polyrotaxanes were also constructed by capping COOH-terminated pseudopolyrotaxanes with bulky amines, in which multiple hydrogen bonds involving the pillar[5]arene OH groups were critically important to prevent dethreading. The number of threaded ring components could be rationally controlled in these materials, providing a simple and versatile method to tune the mechanical and thermal properties. Specifically, a polyrotaxane with a high-molecular-weight axle became elastic upon heating above the melting point of PEOs and exhibited temperature-dependent shape memory property because of the topological confinement and crosslinked hydrogen bonds.
2021年04月12日, 研究論文（学術雑誌）, 共同, 27, 21, 0947-6539, DOI(公開)(r-map), 6435, 6439 - Thermally Responsive Poly(ethylene oxide)-Based Polyrotaxanes Bearing Hydrogen-Bonding Pillar[5]arene Rings
Kato, Kenichi; Onishi, Katsuto; Maeda, Koki; Yagyu, Masafumi; Fa, Shixin; Ichikawa, Takahiro; Mizuno, Motohiro; Kakuta, Takahiro; Yamagishi, Tada-aki; Ogoshi, Tomoki
CHEMISTRY-A EUROPEAN JOURNAL
WILEY-V C H VERLAG GMBH
Polyrotaxanes constructed from hydrogen-bonding pillar[5]arene rings and poly(ethylene oxide) chains were synthesized. A polyrotaxane with a high-molecular-weight poly(ethylene oxide) chain showed temperature-dependent shape memory properties, because of the topological confinement and cross-linked hydrogen bonds. The hydrogen bond networks constructed from pillar[5]arene rings and poly(ethylene oxide) chains are illustrated as music notes and staff notation, respectively. More information can be found in the Full Paper by T. Ogoshi et al. (DOI: 10.1002/chem.202005099).+
2021年04月12日, 研究論文（学術雑誌）, 共同, 27, 21, 0947-6539, DOI(公開)(r-map), 6358, 6358 - Gyroid nanostructured soft membranes formed by controlling the degree of crosslinking polymerization of bicontinuous cubic liquid-crystalline monomers
Maekawa, Asako; Kobayashi, Tsubasa; Ichikawa, Takahiro
POLYMER JOURNAL
SPRINGERNATURE
The self-organization of liquid-crystalline monomers and subsequent polymerization is a unique strategy for creating nanostructured polymer membranes with novel functions and innovative properties. In this study, we developed gyroid nanostructured soft polymer films based on this strategy. Two types of amphiphile zwitterion monomers were designed and synthesized: a single-type amphiphile zwitterion monomer (S-ZI) and a gemini-type monomer (G-ZI). These compounds show liquid-crystalline behavior in the presence of bis(trifluoromethanesulfonyl)imide (HTf2N) and water. We attempted to find an appropriate mixing ratio of S-ZI and G-ZI that satisfied the following two criteria: suitability for the exhibition of bicontinuous cubic (Cub(bi)) phases and acquisition of self-standing properties and softness. The 25/75 wt% component ratio of S-ZI/G-ZI was found to meet these conditions. By carrying out a polymerization for the mixture in the above mixing ratio in the Cub(bi) phase, a polymer film with self-standing properties and resistance to bending was successfully obtained. This film showed a high ionic conductivity of 1.27 x 10(-2) S cm(-1) under a relative humidity of 90%.
2021年03月, 研究論文（学術雑誌）, 共同, 53, 3, 0032-3896, DOI(公開)(r-map), 463, 470 - Gyroid nanostructured soft membranes formed by controlling the degree of crosslinking polymerization of bicontinuous cubic liquid-crystalline monomers
A. Maekawa, T. Kobayashi, T. Ichikawa
Polymer Journal
2020年10月27日, 研究論文（学術雑誌）, 共同, 53, DOI(公開)(r-map), 463, 470 - 液晶分子の自己組織化を利用したソフトなジャイロイド構造膜の創成
一川尚広
日本ゼオライト学会誌
2020年10月15日, （MISC）総説・解説（学術雑誌）, 単独, 37, 4, 0918-7774, DOI(公開)(r-map), 107, 114 - Double-Gyroid Nanostructure Formation by Aggregation-Induced Atropisomerization and Co-Assembly of Ionic Liquid-Crystalline Amphiphiles
Uemura, Nanami; Kobayashi, Tsubasa; Yoshida, Shintaro; Li, Ya-xin; Goossens, Karel; Zeng, Xiangbing; Watanabe, Go; Ichikawa, Takahiro
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
WILEY-V C H VERLAG GMBH
We report a new molecular-design principle for creating double-gyroid nanostructured molecular assemblies based on atropisomerization. Ionic amphiphiles containing two imidazolium rings close to each other were designed and synthesized. NMR data revealed that the rotation of the imidazolium rings is restricted, with an activation energy as high as 63 kJ mol(-1) in DMSO-d(6) solution (DFT prediction for a model compound in the vacuum: 90-100 kJ mol(-1)). Due to the restricted rotation, the amphiphiles feature double atropisomeric axes in their ionic segments and form three stable atropisomers: meso, R, and S. These isomers co-organize into Ia3?d -type bicontinuous cubic liquid-crystalline mesophases through nanosegregation of the ionic and non-ionic parts. Considering the intrinsic characteristic of Ia3?d -type bicontinuous cubic structures that they are composed of intertwined right- and left-handed single gyroids, we propose that the simultaneous presence of both R- and S-atropisomers is an important contributor to the formation of double-gyroid structures.
2020年05月25日, 研究論文（学術雑誌）, 共同, 59, 22, 1433-7851, DOI(公開)(r-map), 8445, 8450 - A liquid-crystalline semiconducting polymer based on thienylene-vinylene-thienylene: Enhanced hole mobilities by mesomorphic molecular ordering and thermoplastic shape-deformable characteristics
Mori, Tatsuya; Komiyama, Hideaki; Ichikawa, Takahiro; Yasuda, Takuma
POLYMER JOURNAL
NATURE PUBLISHING GROUP
Liquid-crystalline (LC) pi-conjugated polymers are an emerging class of semiconducting materials owing to their promising performance in organic field-effect transistors (OFETs). Little is known, however, about the relationship between LC nature and charge carrier mobility. In this paper, we focus on a thiophene-based p-type semiconducting polymer, PC12TV12T, containing thienylene-vinylene-thienylene (TVT) units, and report a systematic investigation of its thermotropic LC properties, self-organized structures in bulk and thin films, as well as charge transport properties in OFETs. We found that thermal annealing at LC temperatures (99-170 degrees C) strongly enhanced OFET performance, leading to field-effect hole mobilities as high as 0.37 cm(2) V-1 s(-1), comparable to that of amorphous silicon. By virtue of its thermoplasticity, the TVT-based polymer can also be processed into fine semiconducting microfibers, which can even function as a p-type active channel for charge transport. This bottom-up technology utilizing the LC nature enables cost-effective and energy-efficient manufacture of optoelectronic devices. A pi-conjugated polymer based on thienylene-vinylene-thienylene (TVT) units can form a thermotropic liquid-crystalline (LC) mesophase over a wide temperature range. Thermal annealing at LC temperatures strongly enhanced hole mobilities in organic field-effect transistors (OFETs) owing to improved molecular ordering. Because of its thermoplasticity, the TVT-based pi-conjugated polymer can also be processed into semiconducting fine microfibers and serve as a charge transport pathway in microfiber OFETs.
2020年03月, 研究論文（学術雑誌）, 共同, 52, 3, 0032-3896, DOI(公開)(r-map), 313, 321 - Anisotropic, Organic Ionic Plastic Crystal Mesophases from Persubstituted Imidazolium Pentacyanocyclopentadienide Salts
Goossens, Karel; Rakers, Lena; Heinrich, Benoit; Ahumada, Guillermo; Ichikawa, Takahiro; Donnio, Bertrand; Shin, Tae Joo; Bielawski, Christopher W.; Glorius, Frank
CHEMISTRY OF MATERIALS
AMER CHEMICAL SOC
We describe the synthesis, supramolecular organization, and thermal characteristics of an unprecedented family of symmetric 1,2,3,4,5-pentaalkylimidazohum ([(C-n)(5)im](+)) salts equipped with halide, nitrate, or pentacyanocyclopentadienide ([Cp(CN)(5)](-)) counterions. Salts containing relatively small anions were obtained as low-melting solids, whereas those with [Cp(CN)(5)](-) anions were found to be ionic liquids even below room temperature. A permethylated derivative, [(C-1)(5)im][Cp-(CN)(5)], proved to be exceptional. Upon heating, the salt self-organized into a new type of organic ionic plastic crystal (OIPC) mesophase, which was termed M-hex and whose anisotropic structure featured hexagonally ordered, rotating anionic stacks positioned within a continuum composed of disordered cations. The structure of the mesophase resembles that of classical columnar liquid-crystalline phases, despite the absence of long, flexible chains. In the M-hex phase, the cations surrounding the anionic columns effectively fulfill the role of ”softening” structural constituents, much in the same way as flexible chains. The discovery of the novel mesophase, which displays a two-dimensional, and thus intrinsically anisotropic, lattice resulting from the rotation of entire ionic assemblies around a columnar axis, represents a new paradigm in the field of OIPCs. Relatively high ionic conductivities were measured in the M-hex phase, particularly after doping with the corresponding sodium salt, Na[Cp(CN)(5)], demonstrating the materials' potential for use in electrochemical applications such as sodium-ion batteries.
2019年12月10日, 研究論文（学術雑誌）, 共同, 31, 23, 0897-4756, DOI(公開)(r-map), 9593, 9603 - Dimension control of ionic liquids
Ichikawa, Takahiro; Kato, Takashi; Ohno, Hiroyuki
CHEMICAL COMMUNICATIONS
ROYAL SOC CHEMISTRY
Ionic liquids have established themselves as promising soft compounds for bringing innovation to materials science. For further developing functions and abilities of ionic liquids, one of the most important challenges is to organize ionic liquids into dimensionally ordered states. In this feature article, we will present the organization of ionic liquids by endowing them with liquid-crystalline properties. In particular, focusing on the specific abilities and properties of functional ionic liquids, a variety of nanostructured ionic materials have been developed and their unique and enhanced functions have been revealed. Some potential uses of organized ionic liquids have also been mentioned.
2019年07月21日, 研究論文（学術雑誌）, 共同, 55, 57, 1359-7345, DOI(公開)(r-map), 8205, 8214 - Gyroid structured aqua-sheets with sub-nanometer thickness enabling 3D fast proton relay conduction
Kobayashi, Tsubasa; Li, Ya-xin; Ono, Ayaka; Zeng, Xiang-bing; Ichikawa, Takahiro
CHEMICAL SCIENCE
ROYAL SOC CHEMISTRY
A polymerizable amphiphile having two zwitterionic head-groups has been designed. This compound co-organizes with an acid, bis(trifluoromethanesulfonyl) imide (HTf2N), into a gyroid bicontinuous cubic liquid-crystalline phase. In situ polymerization of this phase has been successfully achieved by UV irradiation in the presence of a photoinitiator, yielding a self-standing gyroid-nanostructured polymer film. When the polymer film is placed under different relative humidity conditions or in water, it absorbs water owing to the strong hydration ability of the zwitterionic parts. It has been found that the polymer film preserves the gyroid nanostructure after the water absorption. Based on reconstructed electron density maps, it is assumed that the absorbed water molecules form a 3D continuous network along the gyroid minimal surface, which satisfies several key conditions for inducing fast proton conduction. As expected, such hydrated films show high ionic conductivities in the order of 10(-1) S cm(-1) when the water content of the film reaches 15.6 wt% at RH = 90%. The high conductivity is attributed to the induction of the Grotthuss mechanism, that is, proton conduction via the hydrogen-bonding network of the incorporated water molecules.
2019年07月07日, 研究論文（学術雑誌）, 共同, 10, 25, 2041-6520, DOI(公開)(r-map), 6245, 6253 - Amphotropic liquid-crystalline behaviour of glycolipids in amino acid ionic liquids
Shimizu, Yukako; Takeuchi, Hiroaki; Takeuchi, Rika; Ichikawa, Takahiro
LIQUID CRYSTALS
TAYLOR & FRANCIS LTD
We examined lyotropic liquid-crystalline behaviour of glycolipids (GLs) with a normal alkyl chain or a diacetylene-functionalised alkyl chain in several amino acid ionic liquids (AAILs). It was found that the mixtures of GL and AAIL form various nanosegregated liquid-crystalline phases, such as smectic, bicontinuous cubic and hexagonal columnar phases, depending on the two-component ratio and AAIL species. The observed liquid-crystalline behaviours were summarised as phase diagrams. It is noteworthy that the employment of amino acid anions with superior hydrogen-bonding ability, such as aspartic and glutamic acid anions, gives a phase diagram with a wide liquid-crystalline region. Comparing with a phase diagram obtained for the GL/water mixtures, we gained insights on the similarity/dissimilarity between water and AAILs as self-organisation media of amphiphiles. For the diacetylene-functionalised molecule, UV irradiation was carried out to progress polymerisation. It is of interest that the polymerisation reaction progressed when the glycolipid formed a smectic phase in an AAIL while a reaction progress was not found when it formed a bicontinuous cubic phase in another AAIL. We believe that AAILs have a great potential to be a liquid media not only for amphiphiles but for various functional materials, such as polymers and colloids, to form novel assemblies. [GRAPHICS]
2019年06月21日, 研究論文（学術雑誌）, 共同, 46, 8, 0267-8292, DOI(公開)(r-map), 1298, 1306 - Design of Ionic Liquid Crystals Forming Normal-Type Bicontinuous Cubic Phases with a 3D Continuous Ion Conductive Pathway
Ichikawa, Takahiro; Sasaki, Yui; Kobayashi, Tsubasa; Oshiro, Hikaru; Ono, Ayaka; Ohno, Hiroyuki
CRYSTALS
MDPI
We have prepared a series of pyridinium-based gemini amphiphiles. They exhibit thermotropic liquid-crystalline behavior depending on their alkyl chain lengths and anion species. By adjusting the alkyl chain lengths and selecting suitable anions, we have obtained an ionic amphiphile that exhibits a normal-type bicontinuous cubic phase from 38 degrees C to 12 degrees C on cooling from an isotropic phase. In the bicontinuous cubic liquid-crystalline assembly, the pyridinium-based ionic parts align along a gyroid minimal surface forming a 3D continuous ionic domain while their ionophobic alkyl chains form 3D branched nanochannel networks. This ionic compound can form homogeneous mixtures with a lithium salt and the resultant mixtures keep the ability to form normal-type bicontinuous cubic phases. Ion conduction measurements have been performed for the mixtures on cooling. It has been revealed that the formation of the 3D branched ionophobic nanochannels does not disturb the ion conduction behavior in the ionic domain while it results in the conversion of the state of the mixtures from fluidic liquids to quasi-solids, namely highly viscous liquid crystals. Although the ionic conductivity of the mixtures is in the order of 10(-7) S cm(-1) at 40 degrees C, which is far lower than the values for practical use, the present material design has a potential to pave the way for developing advanced solid electrolytes consisting of two task-specific nanosegregated domains: One is an ionic liquid nano-domain with a 3D continuity for high ionic conductivity and the other is ionophobic nanochannel network domains for high mechanical strength.
2019年06月, 研究論文（学術雑誌）, 共同, 9, 6, 2073-4352, DOI(公開)(r-map) - Switching of ionic conductivities in columnar liquid-crystalline anilinium salts: effects of alkyl chains, ammonium cations and counter anions on thermal properties and switching temperatures
Kuo, Daniel; Soberats, Bartolome; Kumar, K. R. S.; Yoshio, Masafumi; Ichikawa, Takahiro; Ohno, Hiroyuki; Zeng, Xiangbing; Ungar, Goran; Kato, Takashi
MOLECULAR SYSTEMS DESIGN & ENGINEERING
ROYAL SOC CHEMISTRY
Switching one-dimensional ion conductivities in organic materials is a challenging task. Recently we found that a liquid-crystalline (LC) N,N,N-trimethyl-3,4,5-tridodecyloxy-anilinium salt showed a remarkable change in the conductivities of about four orders of magnitude, which was triggered by a thermotropic LC phase transition between rectangular (Col(r)) and hexagonal (Col(h)) columnar phases. In the present study, we have succeeded in tuning the switching temperature by changing the length of the alkyl chains attached to the anilinium ring of LC materials. The size of the N,N,N-trialkylanilinium cations, that is, trimethyl, dimethylethyl and diethylmethyl, and the counterion (BF4, PF6 or CF3SO3) play a crucial role in the formation of successive Col(r) and Col(h) LC phases, which affect the switching behaviour. We have found that the temperature of the Col(r)-Col(h) phase transition and the switching of ion conductivity are tuned in N,N,N-trimethylanilinium tetrafluoroborates by changing the length of the alkyl chains. These results give new insights into the design of ion-conductive self-assembled molecular materials.
2019年04月01日, 研究論文（学術雑誌）, 共同, 4, 2, 2058-9689, DOI(公開)(r-map), 342, 347 - Improvement of lipidic bicontinuous cubic phases by the addition of a zwitterion with strong hydration ability and kosmotropicity
Takeuchi, Rika; Ichikawa, Takahiro
NEW JOURNAL OF CHEMISTRY
ROYAL SOC CHEMISTRY
Lyotropic bicontinuous cubic (Q(II)) phases have attracted increasing attention as nanostructured fluidic matrices for some bio-polymers including enzymes and DNA. Owing to the 3D nature of the Q(II) phases, the incorporated polymers show unique molecular behavior in the matrices. In many cases, monoolein (MO) is frequently employed as a lipid molecule because of its advanced ability to form Q(II) phases under a wide range of conditions. However, there are still several aspects that require improvements in MO/water-based systems. In the present study, we have focused on the improvement of the temporal stability of MO/water-based Q(II) matrices by the addition of a zwitterion. We have found that (I) the addition of 3-(1-methyl-3-imidazolio)propanesulfonate (ImZI) results in a decrease in the water activity of the MO/water-based matrices; (II) ImZI is a kosmotropic salt with structure-stabilizing effects on proteins; (III) a polypeptide, dermaseptin, forms a secondary structure in the MO/water/ImZI systems. These results suggest that the present lyotropic systems have great potential to be an ideal matrix for the lipidic cubic phase method that is known as a method to create single crystals of membrane proteins.
2019年02月21日, 研究論文（学術雑誌）, 共同, 43, 7, 1144-0546, DOI(公開)(r-map), 3084, 3090 - Novel V- and Y-Shaped Light-Emitting Liquid Crystals with Pentafluorinated Bistolane-Based Luminophores
Yamada, Shigeyuki; Tanaka, Tsuyoshi; Ichikawa, Takahiro; Konno, Tsutomu
ACS OMEGA
AMER CHEMICAL SOC
Herein, we describe the synthesis of novel light-emitting liquid-crystalline (LC) compounds bearing pentafluorinated bistolane-based luminophores with a V- or a Y-shaped molecular geometry and the evaluation of their LC and photophysical characteristics. The V- or Y-shaped compounds exhibited a unique LC phase and showed photoluminescence (PL) behavior under various circumstances, such as in dilute solution or in the solid state. Notably, PL characteristics were observed even under high-temperature conditions with a crystal (Cr) to LC phase transition, although the PL efficiency (Phi(PL)) was gradually reduced because of thermal molecular motion. Interestingly, FPL was found to be completely recovered through the LC -> Cr phase transition during the cooling process; the PL characteristics of the V- or Y-shaped compounds were sensitively changed by external thermal stress, giving these compounds the ability to act as thermoresponsive PL sensing materials.
2019年02月, 研究論文（学術雑誌）, 共同, 4, 2, 2470-1343, DOI(公開)(r-map), 3922, 3932 - Guest Vapor-Induced State Change of Structural Liquid Pillar[6]arene
Ogoshi, Tomoki; Maruyama, Keisuke; Sakatsume, Yuma; Kakuta, Takahiro; Yamagishi, Tada-aki; Ichikawa, Takahiro; Mizuno, Motohiro
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
AMER CHEMICAL SOC
State change is a key phenomenon in materials science. We report the first observation of vapor responsive reversible structural liquid-to-solid and solid to-structural liquid state changes. We observed that a macrocyclic compound, a pillar[6]arene derivative bearing 12 n-hexyl substituents, is a room temperature structural liquid with unique properties. Formation of a host guest complex between the pillar[6]arene cavity and the n-hexyl substituent results in a structural liquid with nanoscale structural heterogeneities. The structural liquid solidifies when exposed to competitive cyclohexane guest vapor, whereupon cyclohexane replaces the n-hexyl substituents in the pillar[6]arene cavity and the n-hexyl substituents located outside of the cavity crystallize into distinct nanolayer assemblies. The solid reverts back to the structural liquid when the cyclohexane guest is removed through heating under reduced pressure because of rethreading of the n-hexyl substituents into the cavity. The structural liquid-to-solid and solid-to-structural liquid changes are reversible through the uptake and release of cyclohexane guest vapor.
2019年01月16日, 研究論文（学術雑誌）, 共同, 141, 2, 0002-7863, DOI(公開)(r-map), 785, 789 - Thermoresponsive luminescence properties of polyfluorinated bistolane-type light-emitting liquid crystals
Yamada, Shigeyuki; Morita, Masato; Agou, Tomohiro; Kubota, Toshio; Ichikawa, Takahiro; Konno, Tsutomu
ORGANIC & BIOMOLECULAR CHEMISTRY
ROYAL SOC CHEMISTRY
We developed and characterized four polyfluorinated bistolane derivatives. These compounds, which possess either two alkoxy substituents or an alkoxy group and a bromine atom in their two molecular terminals, were synthesized from readily available 4-alkoxy-1-ethynylbenzene with a facile three-step procedure. Their thermodynamic and photophysical properties were evaluated in detail, and they were found to display both liquid-crystalline (LC) and photoluminescence properties. Remarkably, the photoluminescence behaviors dramatically changed during the thermal phase transition between the crystal and LC phases. Thus, these polyfluorinated bistolanes may be promising candidates for thermoresponsive luminous molecules.
2018年08月21日, 研究論文（学術雑誌）, 共同, 16, 31, 1477-0520, DOI(公開)(r-map), 5609, 5617 - A tailor-made design of lipidic bicontinuous cubic matrices using amino acid ionic liquids as self-assembly media
Fujiwara, Saki; Ohno, Hiroyuki; Ichikawa, Takahiro
MOLECULAR SYSTEMS DESIGN & ENGINEERING
ROYAL SOC CHEMISTRY
Lipidic bicontinuous cubic (Q(II)) matrices are a class of liquid-crystalline matrices with three-dimensional (3D) continuity and periodicity. Owing to their unique nanostructures, they have attracted extensive attention as matrices for various bio-functional molecules such as enzymes, DNA, and membrane proteins. In the present study, we have succeeded in developing novel Q(II) matrices using monoolein (MO) as an amphiphile and amino acid ionic liquids (AAILs) as solvents. By employing various AAILs, it has been found that the design of AAILs plays a key role in inducing Q(II) liquid-crystalline phases. It is noteworthy that the excellent designability of AAILs enables the development of Q(II) matrices showing various unique behaviors that are totally different from those of conventional Q(II) matrices containing water as a solvent. For example, the AAIL-based Q(II) matrices preserve the 3D nanostructures even in a low temperature region (lower than 0 degrees C). It is also possible to design Q(II) matrices that preserve the nanostructures for a long period of time under conventional conditions using these AAILs; on the other hand, for water-based Q(II) matrices, special conditions, such as relative humidity over 90%, are required for preserving the nanostructures; moreover, the cubic lattice constant can be controlled from 88 to 100 angstrom by tuning the AAILs. Herein, we not only present the results showing the advantages of the AAIL-based Q(II) matrices in terms of their nanostructure design, but also describe our finding of a primary result showing that the AAIL-based Q(II) matrices have great potential to be used as a matrix for some proteins to form secondary structures. Considering the recent significant progress made in the design of biocompatible ionic liquids, we believe that the present matrix design will lead to the development of a new technology for controlling the functions and behavior of various bio-functional molecules.
2018年08月01日, 研究論文（学術雑誌）, 共同, 3, 4, 2058-9689, DOI(公開)(r-map), 668, 676 - Functional Liquid Crystals towards the Next Generation of Materials
Kato, Takashi; Uchida, Junya; Ichikawa, Takahiro; Sakamoto, Takeshi
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
WILEY-V C H VERLAG GMBH
Since the discovery of the liquid-crystalline state in 1888, liquid crystal science has made great advances through fusion with various technologies and disciplines. Recently, new molecular design strategies and new self-assembled structures have been developed as a result of the progress made in synthetic procedures and characterization techniques. Since these liquid crystals exhibit new functions and properties derived from their nanostructures and alignment, a variety of new functions for liquid crystals, such as transport for energy applications, separation for environmental applications, chromism, sensing, electrooptical effects, actuation, and templating have been proposed. This Review presents recent advances of liquid crystals that should contribute to the next generation of materials.
2018年04月09日, 研究論文（学術雑誌）, 共同, 57, 16, 1433-7851, DOI(公開)(r-map), 4355, 4371 - Oligothiophene-Indandione-Linked Narrow-Band Gap Molecules: Impact of pi-Conjugated Chain Length on Photovoltaic Performance
Komiyama, Hideaki; To, Takahiro; Furukawa, Seiichi; Hidaka, Yu; Shin, Woong; Ichikawa, Takahiro; Arai, Ryota; Yasuda, Takuma
ACS APPLIED MATERIALS & INTERFACES
AMER CHEMICAL SOC
Solution-processed organic solar cells (OSCs) based on narrow-band gap small molecules hold great promise as next-generation energy-converting devices. In this paper, we focus on a family of A-pi-D-pi-A-type small molecules, namely, BDT-nT-ID (n = 1-4) oligomers, consisting of benzo[1,2-b:4,5-b']dithiophene (BDT) as the central electron-donating (D) core, 1,3-indandione (ID) as the terminal electron-accepting (A) units, and two regioregular oligo(3-hexylthiophene)s (nT) with different numbers of thiophene rings as the pi-bridging units, and elucidate their structure-property-function relationships. The effects of the length of the pi-bridging nT units on the optical absorption, thermal behavior, morphology, hole mobility, and OSC performance were systematically investigated. All oligomers exhibited broad and intense visible photoabsorption in the 400-700 nm range. The photovoltaic performances of bulk heterojunction OSCs based on BDT-nT-IDs as donors and a fullerene derivative as an acceptor were studied. Among these oligomers, BDT-2T-ID, incorporating bithiophene as the pi-bridging units, showed better photovoltaic performance with a maximum power conversion efficiency as high as 6.9% under AM 1.5G illumination without using solvent additives or postdeposition treatments. These favorable properties originated from the well-developed interpenetrating network morphology of BDT-2T-ID, with larger domain sizes in the photoactive layer. Even though all oligomers have the same A-D-A main backbone, structural modulation of the pi-bridging nT length was found to impact their self-organization and nanostructure formation in the solid state, as well as the corresponding OSC device performance.
2018年04月04日, 研究論文（学術雑誌）, 共同, 10, 13, 1944-8244, DOI(公開)(r-map), 11083, 11093 - Design of 3D continuous proton conduction pathway by controlling co-organization behavior of gemini amphiphilic zwitterions and acids
Ono, Ayaka; Ohno, Hiroyuki; Kato, Takashi; Ichikawa, Takahiro
SOLID STATE IONICS
ELSEVIER SCIENCE BV
Gemini-type amphiphiles with benzylimidazolium-based zwitterionic head-groups have been newly designed and synthesized. They co-organize into liquid-crystalline ordered states with various acids owing to the nature of the zwitterionic parts to cause ion exchanges with these acids. Their co-organization behaviors can be tuned by various factors including the linker selection between the head-groups, the length of the long alkyl chains, the acid species, and the molar ratio between the zwitterions and acids. By tuning these factors, we have succeeded in preparing amphiphilic zwitterion/acid mixtures that form bicontinuous cubic liquid-crystalline assemblies with a 3D continuous hydrophilic surface. These cubic liquid crystals function as ion transporting matrices whose ionic conductivities are enhanced owing to the presence of a 3D continuous proton conduction pathway along the hydrophilic surface. The present material design would possess a great potential to bring an innovation to the design of proton conductive polymer electrolytes.
2018年04月, 研究論文（学術雑誌）, 共同, 317, 0167-2738, DOI(公開)(r-map), 39, 45 - High-Mobility Regioisomeric Thieno[f,f']bis[1]benzothi-ophenes: Remarkable Effect of Syn/Anti Thiophene Configuration on Optoelectronic Properties, Self-Organization, and Charge-Transport Functions in Organic Transistors
Oyama, Tatsuya; Mori, Tatsuya; Hashimoto, Tomohiro; Kamiya, Muneaki; Ichikawa, Takahiro; Komiyama, Hideaki; Yang, Yu Seok; Yasuda, Takuma
ADVANCED ELECTRONIC MATERIALS
WILEY
pi-Conjugated thienoacene-based organic semiconductors with high charge carrier mobility and processability have been intensively pursued for electronic device applications, including organic field-effect transistors (OFETs). Their charge carrier mobility is an important figure of merit, and is influenced not only by the intrinsic electronic structure at molecular level, but also by the molecular packing arrangement and crystallinity in the solid state. In this work, the focus is on a unique regioisomeric thienoacene system involving dialkyl-thieno[f,f']bis[1]benzothiophene isomers having different syn/anti thiophene configurations (syn- and anti-TBBT-8). The effects of these regioisomeric structures on the physicochemical properties, self-organization behavior, and charge-transport functions are systematically investigated using experimental and theoretical analyses. The structural analyses indicate that the syn- and anti-TBBT-8 isomers self-organize into completely different packing arrangements, in the form of solution-crystallized microribbons and thin films. The resulting charge-transport properties are strongly dependent on the syn/anti thiophene configurations. Remarkably, solution-processed OFETs using the syn-TBBT-8 isomer show high hole mobilities of up to 10.1 cm(2) V-1 s(-1), which are more than one order of magnitude higher than those of the anti-TBBT-8 isomer. This work highlights the importance of the regioisomeric molecular configuration of thienoacene-based organic semiconductors for developing high-performance electronic devices.
2018年01月, 研究論文（学術雑誌）, 共同, 4, 1, 2199-160X, DOI(公開)(r-map) - Design of Dication-Type Amino Acid Ionic Liquids and Their Application to Self-Assembly Media of Amphiphiles
Fujiwara, Saki; Ohno, Hiroyuki; Yoshio, Masafumi; Kato, Takashi; Ichikawa, Takahiro
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
CHEMICAL SOC JAPAN
Dication-type amino acid ionic liquids have been prepared and their physicochemical properties, such as viscosity, glass transition temperature, Kamlet-Taft parameter, ionic conductivity, and refractive index, have been examined. Comparing these properties of the dication-type amino acid ionic liquids with those of corresponding monocation-type ones, we have investigated the effects of the cation-bridging. In addition, the comparison of aliphatic amino acid ionic liquids and aromatic ones has been also examined. By examining lyotropic liquid-crystalline behavior of an amphiphile in these ionic liquids, we have examined how these modifications of ionic liquids make changes in the potential utility of ionic liquids as self-organization media of amphiphiles. It has been found that critical concentrations of lyotropic liquid-crystalline amphiphiles in ionic liquids are successfully reduced by bridging their cations with covalent bonding and/or introducing aromatic-structures into their anions.
2018年01月, 研究論文（学術雑誌）, 共同, 91, 1, 0009-2673, DOI(公開)(r-map), 1, 5 - Functional liquid-crystalline polymers and supramolecular liquid crystals
Kato, Takashi; Uchida, Junya; Ichikawa, Takahiro; Soberats, Bartolome
POLYMER JOURNAL
NATURE PUBLISHING GROUP
The design and functions of liquid-crystalline (LC) polymers with classifying them into conventional-, supramolecular-, dendriticand network-type LC polymers are described. LC polymers show new functions as new devices in the field of energy and environment by incorporating mesogenic moieties exhibiting photonic, electronic and ionic functions. Supramolecular LC polymers show dynamic and unique properties because the mesogenic moieties are built with non-covalent interactions. Dendritic-type LC polymers exhibit liquid crystallinity by nanosegregation of aromatic and aliphatic moieties. Dendritic fork-like mesogens have also been prepared. A variety of nonmesogeic functional building blocks including fullerene, pi-conjugated moieties, catenane, rotaxane and others can be incorporated into LC phases by attaching these dendritic moieties. LC networks are constructed in situ polymerization of polymerizable nematic or nanostructured liquid crystals. The specific characteristics of the LC networks have generated new research trends to develop well-defined polymers that exhibit optical, transport and separation properties. In these materials, through suitable design of LC monomers, the preservation of smectic, columnar and bicontinuous cubic phases has been successfully used for the development of membranes with one-dimensional, two-dimensional and three-dimensional nanostructures.
2018年01月, 研究論文（学術雑誌）, 共同, 50, 1, 0032-3896, DOI(公開)(r-map), 149, 166 - High-Mobility Regioisomeric Thieno[f,f]bis[1]benzothiophenes: Remarkable Effect of syn/anti Thiophene Configuration on Optoelectronic Properties, Self-Organization, and Charge-Transport Functions in Organic Transistors
Tatsuya Oyama, Tatsuya Mori, Tomohiro Hashimoto, Muneaki Kamiya, Takahiro Ichikawa, Hideaki Komiyama, Yu Seok Yang, and Takuma Yasuda
Advanced Electronic Materials
2017年12月, 研究論文（学術雑誌）, 共同, 4, DOI(公開)(r-map), 1700390 - Design of Viologen-Based Liquid Crystals Exhibiting Bicontinuous Cubic Phases and Their Redox-Active Behavior
Kobayashi, Tsubasa; Ichikawa, Takahiro
MATERIALS
MDPI AG
We have succeeded in developing viologen-based liquid-crystalline materials forming bicontinuous cubic phases. They are composed of amphiphilic zwitterions with a viologen ionic-head-group and sulfonyl-imide-type acids. In the bicontinuous cubic liquid-crystalline assemblies, the ionic-head groups of the amphiphiles align along a gyroid minimal surface, forming a 3D continuous viologen layer. The ionic state of the viologen-moieties can be tuned from a dication state (V2+) to a radical mono cation state (V1+center dot) by UV irradiation and/or electric field. This redox reaction proceeds in bulk, accompanying the change of their color from colorless to purple. Interestingly, they preserve the 3D molecular assembled structures beyond the redox reaction, which has been confirmed by polarizing optical microscopy and X-ray diffraction measurements.
2017年11月, 研究論文（学術雑誌）, 共同, 10, 11, 1996-1944, DOI(公開)(r-map) - Design of Dication-Type Amino Acid Ionic Liquids and Their Application to Self-Assembly Media of Amphiphiles
Saki Fujiwara, Hiroyuki Ohno, Masafumi Yoshio, Takashi Kato, Takahiro Ichikawa
Bulletin of the Chemical Society of Japan
2017年10月, 研究論文（学術雑誌）, 共同, 91, DOI(公開)(r-map), 1, 5 - Functional liquid-crystalline polymers and supramolecular liquid crystals
Takashi Kato, Junya Uchida, Takahiro Ichikawa, Bartolome Soberats
Polymer Journal
2017年09月, 共同, 50, DOI(公開)(r-map), 149 - Zwitterions as building blocks for functional liquid crystals and block copolymers
Ichikawa, Takahiro
POLYMER JOURNAL
NATURE PUBLISHING GROUP
Zwitterions are a class of organic salts whose cation and anion are covalently tethered. This characteristic imparts unique physicochemical properties that differ from those of conventional organic salts. Recently, there has been increasing attention paid to the use of these zwitterions as building blocks for functional organic materials due to their unique properties. These materials have been applied to polymers, liquid crystals, dendrimers and nanoparticles. In this review, I focus on the development of nanostructured ionic materials through the organization of zwitterions. The strategies for such development can be roughly classified into two groups: the introduction of liquid-crystalline properties into zwitterions and the design of block copolymers with zwitterionic segments. These zwitterion derivatives show various organizational behaviors, such as self-organization, co-organization with acids or lithium salts and solvent-induced organizational behavior; they also function as unique ionic matrices. The potential applications of these ionic matrices are described.
2017年05月, 研究論文（学術雑誌）, 単独, 49, 5, 0032-3896, DOI(公開)(r-map), 413, 421 - Transport of ions and electrons in nanostructured liquid crystals
Kato, Takashi; Yoshio, Masafumi; Ichikawa, Takahiro; Soberats, Bartolome; Ohno, Hiroyuki; Funahashi, Masahiro
NATURE REVIEWS MATERIALS
NATURE PUBLISHING GROUP
The nanosegregated structures of columnar, smectic and bicontinuous cubic liquid crystals can provide well-organized, nano-and sub-nanosized 1D, 2D and 3D channels capable of ion and electron transport. The molecular shape, intermolecular interactions and nanosegregation of the molecular structures can influence their self-assembly into a range of functional liquid-crystalline nanostructures. The formation of stable and soft liquid-crystalline materials leads to their application as electrolytes for batteries and photovoltaics, semi-conductors, electroluminescence and electrochemical devices. In addition, electro-chemical devices are obtained by using redox-active liquid crystals. In this Review, we focus on the design of liquid-crystalline phases, the resultant self-assembled structures, the transport mechanisms, and the fabrication, function and future development of devices incorporating nanostructured liquid crystals.
2017年04月, 研究論文（学術雑誌）, 共同, 2, 4, 2058-8437, DOI(公開)(r-map) - Development of Glassy Bicontinuous Cubic Liquid Crystals for Solid Proton-Conductive Materials
Kobayashi, Tsubasa; Ichikawa, Takahiro; Kato, Takashi; Ohno, Hiroyuki
ADVANCED MATERIALS
WILEY-V C H VERLAG GMBH
Glassy bicontinuous cubic liquid crystals are developed to be a matrix having a hydrophilic infinite periodic minimal surface (IPMS). They function as a scaffold for water, leading to the formation of a 3D continuous hydrogen-bonding network of water molecules along the IPMS. This material design is advantageous for developing novel electrolytes with rigidity and high proton conductivity.
2017年01月, 研究論文（学術雑誌）, 共同, 29, 4, 0935-9648, DOI(公開)(r-map) - Development of Glassy Bicontinuous Cubic Liquid Crystals for Solid Proton Conductive Materials
Tsubasa Kobayashi, Takahiro Ichikawa, Takashi Kato, and Hiroyuki Ohno
Advanced Materials
2017年01月, 研究論文（学術雑誌）, 共同, 29, DOI(公開)(r-map), 1604429 - Induction of bicontinuous cubic liquid-crystalline assemblies for polymerizable amphiphiles via tailor-made design of ionic liquids
Hiroaki Takeuchi, Takahiro Ichikawa, Masafumi Yoshio, Takashi Kato and Hiroyuki Ohno
Chemical Communications
2016年12月, 研究論文（学術雑誌）, 共同, 52, DOI(公開)(r-map), 12167, 12170 - Construction of gyroid-structured matrices through the design of geminized amphiphilic zwitterions and their self-organization
Takuro Matsumoto, Ayaka Ono, Takahiro Ichikawa, Takashi Kato and Hiroyuki Ohno
Chemical Communications
2016年10月, 研究論文（学術雑誌）, 共同, 52, DOI(公開)(r-map), 12167, 12170 - Induction of an Infinite Periodic Minimal Surface by Endowing An Amphiphilic Zwitterion with Halogen-Bond Ability
Takahiro Ichikawa, Akiyoshi Okafuji, Takashi Kato, and Hiroyuki Ohno
ChemistryOpen
2016年10月, 研究論文（学術雑誌）, 共同, 5, DOI(公開)(r-map), 439, 444 - Cation-π interactions within aromatic amino acid ionic liquids: A new tool for designing functional ionic liquids
Saki Fujiwara, Takahiro Ichikawa, Hiroyuki Ohno
Journal of Molecular Liquids 222
2016年07月, 研究論文（学術雑誌）, 共同, 222, DOI(公開)(r-map), 214, 217 - A Comprehensive Study on Lyotropic Liquid-Crystalline Behavior of an Amphiphile in 20 Kinds of Amino Acid Ionic Liquids
Kanae Fujimura, Takahiro Ichikawa, Masafumi Yoshio, Takashi Kato, Hiroyuki Ohno
Chemistry - An Asian Journal
2016年01月, 研究論文（学術雑誌）, 共同, 11, DOI(公開)(r-map), 520, 526 - Design of ionic liquid-based polyelectrolytes by combining nanostructurisation and zwitterionisation
Takuro Matsumoto, Takahiro Ichikawa, and Hiroyuki Ohno
Polymer Chemistry
2015年12月, 研究論文（学術雑誌）, 共同, 7, DOI(公開)(r-map), 1230, 1233 - Ionic Switch Induced by a Rectangular & Hexagonal Phase Transition in Benzenammonium Columnar Liquid Crystals
Bartolome Soberats, Masafumi Yoshio, Takahiro Ichikawa, Xiangbing Zeng, Hiroyuki Ohno, Goran Ungar, and Takashi Kato
Journal of the American Chemical Society
2015年09月, 研究論文（学術雑誌）, 共同, 137, DOI(公開)(r-map), 13212 - 2D assemblies of ionic liquid crystals based on imidazolium moieties: formation of ion-conductive layers
Junji Sakuda, Masafumi Yoshio, Takahiro Ichikawa, Hiroyuki Ohno and Takashi Kato
New Journal of Chemistry
2015年05月, 研究論文（学術雑誌）, 共同, 39, DOI(公開)(r-map), 4471 - Zwitterionic liquid crystals as 1D and 3D lithium ion transport media
Bartolome Soberats, Masafumi Yoshio, Takahiro Ichikawa, Hiroyuki Ohno and Takashi Kato
Journal of Materials Chemistry A
2015年05月, 研究論文（学術雑誌）, 共同, 3, DOI(公開)(r-map), 11232 - Liquid-Crystalline Electrolytes for Lithium-Ion Batteries: Ordered Assemblies of a Mesogen-Containing Carbonate and a Lithium Salt
Junji Sakuda, Eiji Hosono, Masafumi Yoshio, Takahiro Ichikawa, Takuro Matsumoto, Hiroyuki Ohno, Haoshen Zhou, and Takashi Kato
Advanced Functional Materials
2015年01月, 研究論文（学術雑誌）, 共同, 25, DOI(公開)(r-map), 1206, 1212 - Columnar Nanostructured Polymer Films Containing Ionic Liquids in Supramolecular One-Dimensional Nanochannels
Akihiro Yamashita, Masafumi Yoshio, Seiya Shimizu, Takahiro Ichikawa, Hiroyuki Ohno, Takashi Kato
Journal of Polymer Science, Part A: Polymer Chemistry
2014年12月, 研究論文（学術雑誌）, 共同, 53, -, DOI(公開)(r-map), 366, 371 - Transparent and colourless room temperature ionic liquids having high refractive index over 1.60
Yoko Kayama, Takahiro Ichikawa and Hiroyuki Ohno
Chmeical Communications
2014年10月, 研究論文（学術雑誌）, 共同, 50, DOI(公開)(r-map), 14790, 14792 - Design of Amphiphilic Zwitterions Forming Liquid-Crystalline Phases and Effects of Lithium Salt Addition on Their Phase Behavior
Takuro Matsumoto, Takahiro Ichikawa, Junji Sakuda, Takashi Kato, and Hiroyuki Ohno
Bull. Chem. Soc. Jpn
2014年07月, 研究論文（学術雑誌）, 共同, 87, 7, DOI(公開)(r-map), 792, 796 - Designer lyotropic liquid-crystalline systems containing amino acid ionic liquids as self-organization media of amphiphiles
Takahiro Ichikawa, Kanae Fujimura, Masafumi Yoshio, Takashi Kato and Hiroyuki Ohno
Chemical Communications
2013年11月, 研究論文（学術雑誌）, 共同, 49, 100, DOI(公開)(r-map), 11746 - Design and evaluation of nano-biphasic ionic liquid systems having highly polar and low polar domains
Satomi Taguchi, Takahiro Ichikawa, Takashi Kato, and Hiroyuki Ohno
RSC Advances
2013年10月, 研究論文（学術雑誌）, 共同, 3, 45, DOI(公開)(r-map), 23222 - 3D Anhydrous Proton Transporting Nanochannels Formed by Self-Assembly of Liquid Crystals Composed of a Sulfobetaine and a Sulfonic Acid
Bartolome Soberats, Masafumi Yoshio, Takahiro Ichikawa, Satomi Taguchi, Hiroyuki Ohno, Takashi Kato
Journal of the American Chemical Society
2013年10月, 研究論文（学術雑誌）, 共同, 135, 41, DOI(公開)(r-map), 15286, 15289 - 3D Continuous Water Nanosheet as a Gyroid Minimal Surface Formed by Bicontinuous Cubic Liquid-Crystalline Zwitterions
Takahiro Ichikawa, Takashi Kato, and Hiroyuki Ohno
Journal of the American Chemical Society (ACS Publications)
2012年07月, 研究論文（学術雑誌）, 共同, 134, DOI(公開)(r-map), 11354, 11357 - Self-Organized Liquid-Crystalline Nanostructured Membranes for Water Treatment: Selective Permeation of Ions
Masahiro Henmi, Koji Nakatsuji, Takahiro Ichikawa, Hiroki Tomioka, Takeshi Sakamoto, Masafumi Yoshio, and Takashi Kato
Advanced Materials
2012年06月, 研究論文（学術雑誌）, 共同, 24, 2238-2241, DOI(公開)(r-map) - Co-Organisation of Ionic Liquids with Amphiphilic Diethanolamines: Construction of 3D Continuous Ionic Nanochannels through the Induction of Liquid-Crystalline Bicontinuous Cubic Phases
Takahiro Ichikawa, Masafumi Yoshio, Satomi Taguchi, Junko Kagimoto, Hiroyuki Ohno, and Takashi Kato
Chemical Science
2012年05月, 研究論文（学術雑誌）, 共同, 3, DOI(公開)(r-map), 2001, 2008 - Nano-Biphasic Ionic Liquid Systems Composed of Hydrophobic Phosphonium Salts and a Hydrophilic Ammonium Salt
Satomi Taguchi, Takahiro Ichikawa, Takashi Kato, and Hiroyuki Ohno
Chemical Communications
2012年04月, 研究論文（学術雑誌）, 共同, 48, DOI(公開)(r-map), 5271, 5273 - Induction of Thermotropic Bicontinuous Cubic Phases in Liquid-Crystalline Ammonium and Phosphonium Salts
Takahiro Ichikawa, Masafumi Yoshio, Atsushi Hamasaki, Satomi Taguchi, Feng Liu, Xiang-bing Zeng, Goran Ungar, Hiroyuki Ohno, and Takashi Kato
Journal of the American Chemical Society (ACS Publications)
2012年02月, 研究論文（学術雑誌）, 共同, 134, DOI(公開)(r-map), 2634, 2643 - Gelation of an Amino Acid Ionic Liquid by the Addition of a Phosphonium-Type Zwitterion
Satomi Taguchi, Takuro Matsumoto, Takahiro Ichikawa, Takashi Kato, and Hiroyuki Ohno
Chemical Communnication
2011年10月, 研究論文（学術雑誌）, 共同, 47, DOI(公開)(r-map), 11342, 11344 - Anisotropic Proton Conductive Materials Formed by the Self-organization of Phosphonium-Type Zwitterions
Saori Ueda, Junko Kagimoto, Takahiro Ichikawa, Takashi Kato, Hiroyuki Ohno
Advanced Materials
2011年07月, 研究論文（学術雑誌）, 共同, 23, 27, DOI(公開)(r-map) - 3D Interconnected Ionic Nano-Channels Formed in Polymer Films: Self-Organization and Polymerization of Thermotropic Bicontinuous Cubic Liquid Crystals
Takahiro Ichikawa, Masafumi Yoshio, Atsushi Hamasaki, Junko Kagimoto, Hiroyuki Ohno, Takashi Kato
Journal of the American Chemical Society
2011年01月, 研究論文（学術雑誌）, 共同, 133, 7, DOI(公開)(r-map) - m × n Stacks of Discrete Aromatic Stacks in Solution
Yoshihiro Yamauchi, Yuya Hanaoka, Michito Yoshizawa, Munetaka Akita, Takahiro Ichikawa, Masafumi Yoshio, Takashi Kato, Makoto Fujita
Journal of the American Chemical Society
2010年07月, 研究論文（学術雑誌）, 共同, 132, 28, DOI(公開)(r-map), 9555, 9557 - Ion conductive behavior in a confined nanostructure: NMR observation of self-diffusion in a liquid-crystalline bicontinuous cubic phase
Anton E. Frise, 一川尚広, 吉尾正史, 大野弘幸, Sergey V. Dvinskikh, 加藤隆史, Istvan Furo
Chemical Communications
2010年02月, 研究論文（学術雑誌）, 共同, 46, 5, DOI(公開)(r-map), 728, 730 - Self-Organization of Room-Temperature Ionic Liquids Exhibiting Liquid-Crystalline Bicontinuous Cubic Phases: Formation of Nano-Ion Channel Networks
Takahiro Ichikawa, Masafumi Yoshio, Atsushi Hamasaki, Tomohiro Mukai, Hiroyuki Ohno, and Takashi Kato
Journal of the American Chemical Society
2007年09月, 研究論文（学術雑誌）, 共同, 129, 35, DOI(公開)(r-map) - Columnar Liquid Crystalline Imidazolium Salts: Effects of Anions and Cations on Mesomorphic Properties and Ionic conductivities
Masafumi Yoshio Takahiro Ichikawa Harutoki Shimura Takayoshi Kagata Atsushi Hamasaki Tomohiro Mukai Hiroyuki Ohno and Takashi Kato
Bulletin of the Chemical Society of Japan
2007年09月, 研究論文（学術雑誌）, 共同, 80, 9, DOI(公開)(r-map), 1836, 1841 - Spiropyran-based liquid crystals: The formation of columnar phase via acid-induced spiro-merocyanine isomerisation
Boon-Hooi Tan Masafumi Yoshio Takahiro Ichikawa Tomohiro Mukai Hiroyuki Ohno and Takashi Kato
Chemical Communications
2006年12月, 研究論文（学術雑誌）, 共同, 45, 45, DOI(公開)(r-map), 4703, 4705
著書
- 液晶の自己組織化を利用したナノ構造膜の設計と分離膜としての展開
分離技術会
2023年09月30日 - 両親媒性Zwitterion の自己組織化を用いた三次元プロトン伝導性膜
シーエムシー出版
2022年08月26日 - イオン性液晶を用いた三次元イオン伝導パスの設計
一川尚広
シーエムシー出版
2016年12月 - 分子配向の道しるべ
一川尚広、大野弘幸
高分子学会
2016年02月 - イオン液体を用いた自己組織化技術の革新
一川尚広
化学工業
2015年08月 - 自己組織性イオン液体の設計に基づくジャイロイド構造の構築とその解析および応用
一川尚広，大野弘幸，吉尾正史，加藤隆史
日本結晶学会誌
2015年07月
研究発表、招待講演等
- 界面プロトンホッピング伝導の高速化及びそれに関わる水分子のダイナミクス解析
令和7年度中性子産業利用報告会
2025年07月17日, 口頭発表（招待・特別） - 双性イオンの自己組織化を利用した三次元機能性界面の設計
日本接着学会 若手交流シンポジウム2025
2025年06月29日, 口頭発表（招待・特別） - ジャイロイド構造を有する高分子膜の創成と機能開拓
2025年繊維学会年次大会
2025年06月11日, 口頭発表（招待・特別） - Gyroid Minimal Surface as Proton Conduction Pathway
Gyroid is everywhere
2024年11月20日, 口頭発表（招待・特別） - ジャイロイド構造を活かした高速界面プロトンホッピング伝導
第73回高分子討論会
2024年09月26日, 口頭発表（招待・特別） - Potential Utility of Zwitterionic Liquid Crystals for the Design of Functional Bicontinuous Cubic Liquid Crystals
29th International Liquid Crystal Conference (ILCC 2024)
2024年07月22日, 口頭発表（一般） - 基礎講座「化学」
2024年日本液晶学会小サマースクール（SSS2024）
2024年07月11日, 口頭発表（招待・特別） - 未来液晶の開拓：ジャイロイドナノ構造の創成と超機能
2024年未来物質開拓シンポジウム
2024年07月06日, 口頭発表（招待・特別） - 双連続キュービック液晶を用いた機能性ナノ構造の構築
第4 回柔粘性結晶研究会
2024年06月15日, 口頭発表（招待・特別） - 双連続キュービック液晶を”育てる‼”
さきがけ「超空間」報告会
2023年11月02日, 口頭発表（招待・特別） - ジャイロイド構造膜の開発に向けた液晶性モノマーの設計と機能展開
第72回高分子討論会
2023年09月27日, 口頭発表（一般） - スルホ基の超高密度配列を有するプロトン伝導性高分子膜の開発
第72回高分子討論会
2023年09月27日, 口頭発表（一般） - Gyroid Nanostructured Polymer Electrolytes Having a 3D Continuous Proton Conduction Pathway
ICPAC BALI 2023
2023年09月15日, 口頭発表（招待・特別） - Gyroid nanostructured polymer electrolyte membranes with a 3D continuous proton conduction pathway: conduction mechanism and new functions
2023年07月09日, ポスター発表 - アトロプ異性化能を有するイオン性扇型分子の分子立体構造とサーモトロピック液晶性の評価
第24回液晶化学研究会シンポジウム
2023年07月01日, ポスター発表 - ジャイロイド構造を有する三次元機能高分子膜の設計開発と応用展開
高分子同友会第52回総合講演会
2022年09月21日, 口頭発表（招待・特別） - ジャイロイド極小界面を用いた三次元プロトン伝導パスの創成
高分子同友会勉強会 “Ｄ 環境及びエネルギーに関する 最新の技術及び市場を勉強する会”
2021年03月04日, 口頭発表（招待・特別） - ～研究人生における 『しゅ』 『は』 『り』～
第二回イオン液体研究会 若手の会
2017年11月22日, 口頭発表（招待・特別） - 機能材料としての双連続キュービック液晶設計
第2回 液晶若手勉強会
2016年09月24日, その他 - 三次元極小界面を用いたイオン伝導性界面の設計
高分子討論会
2016年09月14日, 口頭発表（一般） - イオン液体を用いた液晶の設計とその機能展開
高分子夏の学校
2016年08月05日, 口頭発表（招待・特別） - ハロゲンボンディングを利用した三次元極小界面の誘起
第20回液晶化学研究会スケジュール
2016年07月04日, ポスター発表 - 液晶の自己組織化を用いたジャイロイド構造の設計と展開
超分子研究会
2016年05月20日, 口頭発表（招待・特別） - 液晶分子の自己組織化を利用した機能界面の設計と展開
日本化学会 年次大会
2016年03月27日, 口頭発表（一般） - 液晶の自己組織化を利用したジャイロイド界面の設計とその応用
ソフトマター研究室セミナー
2016年03月14日, 口頭発表（一般） - Design of Functional Bicontinuous Cubic Liquid Crystals and Their Potential Applications
The 3rd CMS International Symposium
2016年01月22日, 口頭発表（招待・特別） - Design of bicontinuous cubic liquid-crystalline assemblies using ionic liquids as building block
環太平洋国際化学会議
2015年12月18日, 口頭発表（一般） - Development of 3D Continuous Proton Conduction Pathway Using Self-Organization of Bicontinuous Cubic Liquid Crystals
第25回 日本MRS年次大会
2015年12月08日, 口頭発表（招待・特別） - イオン液体の液晶 ～液晶の自己組織化を駆使したジャイロイド構造の創成～
『不均一性・不規則性・多形性』の研究会
2015年07月17日, その他 - 3D Continuous Proton Conductive Pathways through the Organization of Amphiphilic Zwitterions Forming Bicontinuous Cubic Phases
International Conference on Frontiers in Materials Processing, Applications, Research & Technology (FiMPART 2015)
2015年06月13日, 口頭発表（招待・特別） - "双連続キュービック液晶デザインの難しさ" vs "イオン液体の構造多様性"
第19回 液晶化学研究会シンポジウム
2015年05月15日, 口頭発表（一般） - イオン伝導性液晶の開発 “双連続キュービック液晶との出会い、別れ、再会”
機能分子化学研究会
2015年03月21日, 口頭発表（一般） - 液晶の自己組織化を利用したジャイロイド構造の設計とその応用
日本学術振興会第142委員会
2015年03月10日, 口頭発表（一般） - イオン液体のデザイン性を駆使した自己組織化材料の開発
第20回 錯体化学若手の会 中部・東海地区勉強会
2014年10月18日, 口頭発表（招待・特別） - 液晶性Zwitterionのデザインと その自己組織化制御を通じた機能展開
第63回高分子討論会
2014年09月25日, 口頭発表（一般） - 酸・塩添加による両親媒性Zwitterionの自己組織化制御
2014年日本液晶学会討論会
2014年09月08日, 口頭発表（一般） - Application of Gyroid Minimal Surface for 3D Continuous Proton Conductive Pathway
第23回日本MRS年次大会
2013年12月09日, 口頭発表（一般） - 双連続キュービック相を発現する液晶性イオン液体の構築及びその分子集合構造の解析
第4回イオン液体討論会
2013年11月20日, ポスター発表 - Three-dimensionally continuous gyroid minimal surface formed by self-organization of amphiphilic zwitterions into bicontinuous cubic phases
12th European Conference on Liquid Crystals
2013年09月25日, 口頭発表（一般） - イオン液体を基幹物質とした機能性双連続キュービック液晶のデザインとその応用展開
第62回高分子討論会
2013年09月12日, 口頭発表（一般） - アミノ酸イオン液体を溶媒としたリオトロピック液晶の構築
2013年日本液晶学会討論会
2013年09月09日, 口頭発表（一般） - Zwitterionの自己組織化を利用した三次元プロトン伝導性界面の構築
2013年日本液晶学会討論会
2013年09月09日, 口頭発表（一般） - イオン液体を利用した機能性双連続キュービック液晶の開発
第１回 液晶若手勉強会
2013年07月27日, 口頭発表（一般） - Development of Lyotropic Liquid Crystals Containing Amino Acid Ionic Liquids as Solvents
33rd International Conference on Solution Chemistry Post-symposium on Ionic Liquids From Science to Green Chemical Applications
2013年07月13日, ポスター発表 - Self-Organization of Functional Ionic Liquids into Bicontinuous Cubic Liquid-Crystalline Assemblies
COIL-5
2013年04月23日, ポスター発表 - 液晶分子の自己組織化を利用した機能界面の設計と展開
日本化学会 年次大会
2013年03月27日, 口頭発表（一般） - Bicontinuous Cubic Liquid-Crystalline Assemblies Formed through Self-Organization of Ionic Liquids
JAIST International Symposium on Ionics Materials
2013年03月13日, 口頭発表（一般） - Zwitterionの自己組織化を利用した三次元プロトン伝導性界面の構築
第3回イオン液体討論会
2012年12月07日, 口頭発表（一般） - 双連続キュービック液晶を用いた三次元プロトン伝導性界面の構築
2012年日本液晶討論会
2012年09月05日, ポスター発表 - ホスホニウム塩型Zwitterionを用いた異方的プロトン伝導材料の構築
2011年日本液晶討論会
2011年09月11日, ポスター発表 - Zwitterionの自己組織化による異方的プロトン伝導材料の構築
液晶化学シンポジウム
2011年06月04日, ポスター発表 - Development of Nanostructured Ion-Conductive Polymer Films Having 3D Interconnected Ion Nano-Channels
The 2nd FAPS Polymer Congress
2011年05月09日, その他 - 液晶分子設計とその構築原理～構造解析から最新の機能展開～
第6回有機結晶プレシンポジウム
0201年09月27日, 口頭発表（招待・特別）
外部研究資金等
- 三次元Gyroid極小界面を用いたプロトン伝導性空間の創成
受託研究, 自 2016年04月01日, 至 2017年03月31日 - 三次元Gyroid極小界面を用いたプロトン伝導性空間の創成
受託研究, 自 2015年04月01日, 至 2016年03月31日 - 三次元Gyroid極小界面を用いたプロトン伝導性空間の創成
受託研究, 自 2014年10月01日, 至 2015年03月31日