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Nishiyama K, Kinoshita M, Harada T, Katsumoto Y. Synthesis of optically clear molecular organogels using phenol and a sulfosuccinic surfactant in various solvents with cyclic geometries. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.07.091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Nishiyama K, Ehara M, Katsube S, Kaji T. Synthesis of Optically Clear Molecular Organogels Comprising Phenol and Surfactants of Sulfosuccinic Acid Derivatives. CHEM LETT 2017. [DOI: 10.1246/cl.170540] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Katsura Nishiyama
- Department of Environmental Science and Technology, Meijo University, Tempaku, Nagoya, Aichi 468-8502
| | - Mamoru Ehara
- Faculty of Education, Shimane University, Matsue, Shimane 690-8504
| | - Shotaro Katsube
- Faculty of Education, Shimane University, Matsue, Shimane 690-8504
| | - Toshihiko Kaji
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588
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Katsube S, Kinoshita M, Amano K, Sato T, Katsumoto Y, Umecky T, Takamuku T, Kaji T, Hiramoto M, Tsurunaga Y, Nishiyama K. Solvent-Dependent Properties and Higher-Order Structures of Aryl Alcohol + Surfactant Molecular Gels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:4352-4360. [PMID: 27064848 DOI: 10.1021/acs.langmuir.6b01109] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Molecular organogels, comprising small organic gelators in solvents, can be applied for dispersal of optical devices, such as emitters. Phenolic compounds and the surfactant bis(2-ethylhexyl) sulfosuccinate (AOT) are known examples of self-assembly organogels. However, conventional phenol + AOT gels in aromatic and acyclic alkane solvents are optically turbid, which is an obstacle for use as host materials in optical devices. In this study, a variety of aryl alcohol-AOT-solvent sets have been investigated systematically, and the correlation between the molecular architecture and optical transparency of the gels was considered. Accordingly, p-chlorophenol + AOT gels in cyclic alkane solvents were shown to form optically transparent gels. In contrast, aromatic and acyclic alkane solvents gave rise to turbid or opaque gels, even when utilizing the same gelators. AFM, NMR, SAXS, and FTIR were employed to determine the organogel structures. Consequently, we found that the gel transparency strongly depends on the size of the fibrous network of the gel, the structure of which is attributed to higher-order aggregates of the gelators. The average contour length and diameter of the fibrous network, lav and dav, respectively, were determined from AFM images. The transparent gels were shown to have lav = 4-9 μm and dav ≤ 0.3 μm, whereas the turbid gels had lav = 15 μm and dav = 0.4-0.6 μm. Such differences in the size of the fibrous network significantly affected the mechanical response of the gels, as shown by stress-strain measurements.
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Affiliation(s)
- Shotaro Katsube
- Faculty of Education, Shimane University , Matsue, Shimane 690-8504, Japan
| | - Masaru Kinoshita
- Faculty of Education, Shimane University , Matsue, Shimane 690-8504, Japan
| | - Kenshi Amano
- Division of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University , Ueda, Nagano 386-8567, Japan
| | - Takaaki Sato
- Division of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University , Ueda, Nagano 386-8567, Japan
| | - Yukiteru Katsumoto
- Department of Chemistry, Faculty of Science, Fukuoka University , Fukuoka 814-0180, Japan
| | - Tatsuya Umecky
- Department of Chemistry and Applied Chemistry, Graduate School of Science and Engineering, Saga University , Saga 840-8502, Japan
| | - Toshiyuki Takamuku
- Department of Chemistry and Applied Chemistry, Graduate School of Science and Engineering, Saga University , Saga 840-8502, Japan
| | - Toshihiko Kaji
- Department of Applied Physics, Tokyo University of Agriculture and Technology , Koganei, Tokyo 184-8588, Japan
| | | | - Yoko Tsurunaga
- Faculty of Education, Shimane University , Matsue, Shimane 690-8504, Japan
| | - Katsura Nishiyama
- Faculty of Education, Shimane University , Matsue, Shimane 690-8504, Japan
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Watanabe Y, Harada T, Kawai H, Kaji T, Hiramoto M, Nishiyama K. Emission properties of [Eu(hfa)3(phen)] and [Eu(hfa)3(TPPO)2] dispersed in a fibrous network comprising p-chlorophenol + AOT organogels. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2015.08.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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