九州大学 · Materials Science
김이즈카 교수의 연구실은 이온 액체, 고분자 수용체, 광학적 에너지 변환을 중심으로 한 혁신적 소재 개발을 추구합니다. 특히 당을 용해할 수 있는 이온 액체를 통해 생체 분자의 상호작용을 제어하고, 광열 변환 및 광학 업컨버전을 활용한 생체 적합성 소재를 개발하고 있습니다. 또한, 자기 조립을 통한 이온 젤, 삼중자 에너지 이동 기반 업컨버전 등 고도화된 나노구조를 설계하여 에너지 효율성과 안정성을 동시에 확보하는 데 주력하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Ether-containing ionic liquids are developed, which are capable of dissolving carbohydrates such as β-d-glucose, α-cyclodextrin, amylose, agarose, and a glycosylated protein, glucose oxidase. When glycolipids are dispersed in these sugar-philic ionic liquids, stable bilayer membranes are formed. They display reversible thermal transformation from fibrous assemblies to vesicles. Physical gelation of ionic liquids occurs by dissolving amide-group-enriched glycolipids, providing a first example of
Ionic crystals (ICs) of the azobenzene derivatives show photoinduced IC-ionic liquid (IL) phase transition (photoliquefaction) upon UV-irradiation, and the resulting cis-azobenzene ILs are reversibly photocrystallized by illumination with visible light. The photoliquefaction of ICs is accompanied by a significant increase in ionic conductivity at ambient temperature. The photoliquefaction also brings the azobenzene ICs further significance as photon energy storage materials. The cis-IL shows the
The potential of three-dimensional (3D) metal-halide perovskites to sensitize organic triplets is unveiled. Nanocrystals of surface-modified inorganic cesium lead halide perovskites (CsPbX<sub>3</sub>, X = Br/I) are found to work as efficient triplet sensitizers for photon upconversion based on triplet-triplet annihilation (TTA-UC) at low excitation intensity.
Photon upconversion (UC) from near-infrared (NIR) light to visible light has enabled optogenetic manipulations in deep tissues. However, materials for NIR optogenetics have been limited to inorganic UC nanoparticles. Herein, NIR-light-triggered optogenetics using biocompatible, organic TTA-UC hydrogels is reported. To achieve triplet sensitization even in highly viscous hydrogel matrices, a NIR-absorbing complex is covalently linked with energy-pooling acceptor chromophores, which significantly
An emerging field of triplet energy migration-based photon upconversion (TEM-UC) is reviewed. Highly efficient photon upconversion has been realized in a wide range of chromophore assemblies, such as non-solvent liquids, ionic liquids, amorphous solids, gels, supramolecular assemblies, molecular crystals, and metal-organic frameworks (MOFs). The control over their assembly structures allows for unexpected air-stability and maximum upconversion quantum yield at weak solar irradiance that has neve
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTube-like Nanostructures Composed of Networks of Complementary Hydrogen BondsNobuo Kimizuka, Takayoshi Kawasaki, Kiyoko Hirata, and Toyoki KunitakeCite this: J. Am. Chem. Soc. 1995, 117, 23, 6360–6361Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995https://pubs.acs.org/doi/10.1021/ja00128a027https://doi.org/10.1021/ja00128a027research-articleACS PublicationsRequest reuse permissionsArticle
Complexation of copper(II) 2,3,9,10,16,17,23,24-octahydroxy-29H,31H-phthalocyanine (CuPcOH) with copper(II) ions gives a two-dimensional (2D) metal-organic framework (MOF). This is the first report of a phthalocyanine-based MOF. This 2D MOF was obtained as a black powder and showed an electrical conductivity of 1.6×10<sup>-6</sup> S cm<sup>-1</sup> at 80 °C. When this MOF is used as a cathode of lithium ion battery (LIB), large charge/discharge capacities of 151/128 mAh g<sup>-1</sup> were obtai
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-organization of bilayer membranes from amphiphilic networks of complementary hydrogen bondsNobuo Kimizuka, Takayoshi Kawasaki, and Toyoki KunitakeCite this: J. Am. Chem. Soc. 1993, 115, 10, 4387–4388Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 May 1993https://pubs.acs.org/doi/10.1021/ja00063a077https://doi.org/10.1021/ja00063a077research-articleACS PublicationsRequest reuse permissionsArticl
A liquid solar thermal fuel is developed; a low-molecular weight liquid trans-azobenzene derivative shows facile photoisomerization to the higher-energy cis-isomer in neat condition so that a high volumetric energy density is achieved. Shear viscosity measurements for each isomer liquid unveiled transitions from non-Newtonian to Newtonian fluids.
Amphiphilic hydrogen bond networks consisting of alkylated melamines and ammonium headgroup-appended cyanuric acids are stably dispersed in water as supramolecular membranes. Electron micrographs of these aqueous dispersions indicated the formation of supramolecular assemblies of mesoscopic dimension. Their aggregate morphologies, molecular orientation, and thermal characteristics are markedly dependent on the chemical structure of constituent molecules. Self-supporting multilayer films were obt
An efficient visible-to-UV photon upconversion was achieved by combining a TADF sensitizer and UV emitters with the highest T<sub>1</sub>and S<sub>1</sub>energy levels.
Molecules capable of reversible storage of solar energy have recently attracted increasing interest. Here, a liquid azobenzene molecule has been studied for solar thermal energy storage applications and integrated into flow-chemistry devices.
Farbiges Inneres: Funktionelle Farbstoffmoleküle können adaptiv in Koordinationsnanopartikel (CNPs) aus Nucleotiden und Lanthanoid-Ionen während deren Bildung in Wasser eingeschlossen werden. Dort sind die Farbstoffmoleküle konformativ eingeschränkt und überraschend gut gegen molekularen Sauerstoff geschützt. Diese Eigenschaften sollten für die Entwicklung von lichtsammelnden CNPs günstig sein. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such doc
Efficient NIR-to-blue photon upconversion was realized for the first time by exploiting sensitizer S–T transition and achieved the largest anti-Stokes shift of 0.97 eV.
A new family of surface-functionalized CdSe/ZnS core-shell quantum dots (csQD) has been developed, which work as triplet sensitizers for triplet-triplet annihilation-based photon upconversion (TTA-UC). The surface modification of csQD with acceptor molecules plays a key role in the efficient relay of the excited energy of csQD to emitter molecules in the bulk solution, where the generated emitter triplets undergo triplet-triplet annihilation that leads to photon upconversion. Interestingly, impr
