Temperature-induced sedimentation to dispersion of ionic vesicles |
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Authors: | Kawasaki Hideya Miyahara Masahiko Almgren Mats Karlsson Göran Maeda Hiroshi |
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Institution: | Department of Chemistry, Faculty of Science, Kyushu University 33, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. hkawascc@mbox.nc.kyushu-u.ac.jp |
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Abstract: | We present a temperature-induced sedimentation/dispersion transition of ionic vesicles in the system of alkyldimethylamine oxide hemihydrochloride (CnDMAO.1/2HCl) with a hydrocarbon chain length of 12-16 (n = 12, 14, and 16) and sodium 2-naphthalenesulfonate (NaNphS). The temperature-sensitive sedimentation/dispersion of ionic vesicles took place around a temperature of 50 degrees C, which was weakly dependent on the alkyl chain length. The combined effect of the thermally induced dissociation of the counterions from the vesicle and a hydrogen bonding between the nonionic and the cationic head groups is likely to be responsible for this unique behavior. |
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