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Citation: WANG Hai-Ying, LI Bin-Dong, HU An-Jun, LU Chun-Xu. Surface Activity of a Novel Borate Ester Surfmer and Its Interaction with LAS in Aqueous Solutions[J]. Acta Physico-Chimica Sinica, ;2007, 23(02): 253-257. doi: 10.3866/PKU.WHXB20070222 shu

Surface Activity of a Novel Borate Ester Surfmer and Its Interaction with LAS in Aqueous Solutions

1.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

Received Date: 3 July 2006
Available Online: 30 January 2007

Using surface tension method, the changes of surface activity and thermodynamic properties of a novel borate surfactant surfmer (BES) in aqueous solution were studied at different temperatures (288-313 K). The interaction of BES with sodium dodecylbenzene sulfonate (LAS) in 0.5 mol·L-1 aqueous NaCl solutions was also measured. The results showed that the critical micelle concentration(cmc) of BES at 298 K was 0.066 mmol·L-1, and γcmc was 29.2 mN·m-1. The micellization free energie (ΔG0m) was in the range of -22.4 - -25.8 kJ·mol-1 at the experimental temperatures, and the process of micellization of BES was mainly driven by the entropy. The mixed BES/LAS solution was a non-ideal system with negative deviation, and the average molecular interaction parameter βm was -3.48. When the molar fraction αBES of BES in bulk solution was 0.5, its molar fraction X1m in mixed micelles was 0.46, |βm| could reach the maximum, cmc of the mixed solution reached the minimum 0.017 mmol·L-1, and γcmc was 27.8 mN·m-1.
- Surfmer;Borate ester;Critical micelle concentration(cmc);Molecular interaction parameter
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