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Structure and growth behavior of centimeter-sized helical oleate assemblies formed with assistance of medium-length carboxylic acids

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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)

Submitter: 景山 義之

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