Journal
SOFT MATTER
Volume 11, Issue 18, Pages 3550-3558Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sm00370a
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Funding
- Sasakawa Scientific Research Grant from the Japan Science Society
- JSPS KAKENHI [23750142, 25620002]
- JST PRESTO (Molecular Technology) from MEXT Japan
- Grants-in-Aid for Scientific Research [25103009, 25620002, 23750142] Funding Source: KAKEN
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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 mm-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.
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