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Effect of ionic surfactants on the iridescent color in lamellar liquid crystalline phase of a nonionic surfactant

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Title: Effect of ionic surfactants on the iridescent color in lamellar liquid crystalline phase of a nonionic surfactant
Authors: Chen, Xinjiang Browse this author
Mayama, Hiroyuki Browse this author →KAKEN DB
Matsuo, Goh Browse this author
Torimoto, Tsukasa Browse this author
Ohtani, Bunsho Browse this author →KAKEN DB
Tsujii, Kaoru Browse this author
Keywords: Bilayer membrane
Iridescent color
Helfrich thermal undulation
Liquid crystal
Lamellar sheet
Lamellar vesicle
Issue Date: 2007
Publisher: Elsevier Inc.
Journal Title: Journal of Colloid and Interface Science
Volume: 305
Issue: 2
Start Page: 308
End Page: 314
Publisher DOI: 10.1016/j.jcis.2006.09.070
PMID: 17046012
Abstract: A nonionic surfactant, n-dodecyl glyceryl itaconate (DGI), self-assembles into bilayer membranes in water having a spacing distance of sub-micrometer in the presence of small amounts of ionic surfactants, and shows beautiful iridescent color. Ionic surfactants have strong effects on this iridescent system. We have interestingly found that the iridescent color changes with time after mixing DGI and ionic surfactants and the color in equilibrium state changes greatly with concentration of the ionic surfactants. The time-dependent color change results from the transformation of DGI aggregate structure after being mixed with ionic surfactant. It is first found that the iridescent color of this nonionic system can be changed from red to deep blue by altering the concentration of ionic surfactants added even though the total concentration of surfactant is almost constant. Such large blue shift of the iridescent color in equilibrium state cannot be fully explained by the ordinary undulation theory applied so far for this phenomenon. The flat lamellar sheets tend to curve by increasing the concentration of ionic surfactants to form separated onion-like and/or myelin-like structures. These separated structures of lamellar system result in the decrease of spacing distance between bilayer membranes because some vacant spaces necessarily appear among these structures.
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 辻井 薫

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