Synthesis and Surface Activity of Anionic Gemini Surfactants with Alkyl Spacers |
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| Authors: | Xue-Peng Liu Jie Feng Lu Zhang Qing-Tao Gong Jia-Yong Yu |
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| Affiliation: | 1. Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Beijing, P. R. China;2. Graduate School , Chinese Academy of Sciences , Beijing, P. R. China;3. Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Beijing, P. R. China |
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| Abstract: | A series of anionic Gemini surfactants called alkanediyl-α,ω-bis(m-octylphenoxy sulfonate) with different length of (CH2)x spacer, C8CxC8 (x = 2, 4, 6, 8), have been synthesized from 4-n-octylphenol and their basic physicochemical properties are investigated. The results indicate that they are different from cationic Gemini surfactants called alkanediyl-α,ω-bis(dimethyldodecylammonium bromide), 12-(CH2)s-12, in the literature. It is found that as the carbon atom number of the spacer increases, the cmc (critical micelle concentration) decreases gradually, and the surface area per molecule (Amin) decreases initially and then increases. The breakpoints appear at number 4 of carbon atom in the spacer. Though the length of the spacer is different for the Gemini surfactants from C8C2C8 to C8C6C8, there is no obvious change on the micropolarity. |
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| Keywords: | Anionic Gemini surfactants critical micelle concentration (cmc) micropolarity synthesis the surface area per molecule (Amin) |
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