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Abstract:
The sodium carboxylate Gemini surfactants containing a rho-phendioxy spacer, Cm+1-Ph-Cm+1(2cbx) . 2Na (cbx means carboxylate, m + 19,11,13), were synthesized and their micellization in aqueous solution was studied by using conductivity measurements. The critical micelle concentration (cme) of Cm+1-Ph-Cm+1(2cbx) . 2Na was found to be considerably low in aqueous solution. The regression equations of cmc-T was shown as cmc = 8.57 x 10(-4)T(2) - 0.499T + 78.2 (m + 1 = 9), cmc = 2.86 x 10(-5)T(2) - 0.0146T + 2.90(m + 1 = 11) and cmc = 1. 43 x 10(-5)T(2) - 0.00730T + 1.28(m + 1 = 13), respectively. The variation of lncmc with (m+1) for all three surfactants obeyed an unified regression equation as Incmc = 0.0323 (m + 1)(2) - 1.00 (m + 1) + 7.16. The thermodynamic functions calculated indicate that the micellization is an entropy-driven process and has a character of enthalpy-entropy compensation. In all the systems examined the micelle formed by (m + 1) = 11 is the most stable.
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CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
ISSN: 0251-0790
CN: 22-1131/O6
Year: 2003
Issue: 11
Volume: 24
Page: 2056-2059
0 . 7 9 6
JCR@2003
0 . 7 0 0
JCR@2023
ESI Discipline: CHEMISTRY;
JCR Journal Grade:2
Cited Count:
WoS CC Cited Count: 10
SCOPUS Cited Count:
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 2
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