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Structure and growth behavior of centimeter-sized helical oleate assemblies formed with assistance of medium-length carboxylic acids
| Title: | Structure and growth behavior of centimeter-sized helical oleate assemblies formed with assistance of medium-length carboxylic acids |
| Authors: | Kageyama, Yoshiyuki Browse this author →KAKEN DB | | Ikegami, Tomonori Browse this author | | Hiramatsu, Natsuko Browse this author | | Takeda, Sadamu Browse this author →KAKEN DB | | Sugawara, Tadashi Browse this author →KAKEN DB |
| Issue Date: | 5-Mar-2015 |
| Publisher: | Royal Society of Chemistry |
| Journal Title: | Soft Matter |
| Volume: | 11 |
| Issue: | 18 |
| Start Page: | 3550 |
| End Page: | 3558 |
| Publisher DOI: | 10.1039/C5SM00370A |
| PMID: | 25781720 |
| Abstract: | The nonequilibrium organization of self-assemblies from small building-block molecules offers an attractive and essential means to develop advanced functional materials and to understand the intrinsic nature of life systems. Fatty acids are well-known amphiphiles that form self-assemblies of several shapes. Here, we found that the lengths of helical structures of oleic acid formed in a buffered aqueous solution are dramatically different by the presence or absence of certain amphiphilic carboxylic acids. For example, under the coexistence of a small amount of N-decanoyl-L-alanine, we observed the formation of over 1 centimeter-long helical assemblies of oleate with a regular pitch and radius, whereas mainly less than 100 μm-long helices formed without this additive. Such long helical assemblies are unique in terms of their highly dimensional helical structure and growth dynamics. Results from the real-time observation of self-assembly formation, site-selective small-angle X-ray scattering, high-performance liquid chromatography analysis, and pH titration experiments suggested that the coexisting carboxylates assist in elongation by supplying oleate molecules to a scaffold for oleate helical assembly. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/60785 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 景山 義之
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