Solution properties of mixed surfactant system sodium dodecyl sulfate and alkyl polyoxyethylene ether system |
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| Authors: | Keizo Ogino Toshlaki Kakihara Hirotaka Uchiyama Masahiko Abe |
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| Affiliation: | (1) Faculty of Science and Technology, Science University of Tokyo, Noda, 278 Chiba, Japan;(2) Institute of Colloid and Interface Science, Science University of Tokyo, Shinjuku-ku 162, Kagurazaka, Japan |
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| Abstract: | The effect of oxyethylene groups in a nonionic surfactant on the solution properties of anionicnonionic systems is described;
these systems are sodium dodecyl sulfate (SDS)—hexadecyl polyoxyethylene ethers (C16POEn, where n=10, 20, 30 and 40). The degree of ionic dissociation of the mixed micelles decreases with increasing numbers of
oxyethylene groups in the nonionic surfactant. As polyoxyethylene chain lengths increase, the electrical conductivities of
the mixed surfactant solutions decrease, in spite of the decrease in activation energy for conduction. The radius of the mixed
micelle with the electric double layer is larger for a nonionic surfactant having a shorter polyoxyethylene chain length than
for one having a long polyoxyethylene chain. This may be attributed to the fact that the mixed micelle is formed more easily
by a nonionic surfactant with a shorter polyoxyethylene chain length than by one with a longer chain. |
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