纳米银对椰油酰基谷氨酸三乙醇胺盐表面活性的影响

doi:10.3969/j.issn.1001-1803.2022.04.003

Abstract

Abstract:

The mixed system of 50 mg/kg nano-silver and triethanolammonium （TEA⁺） cocoyl glutamate was prepared by green chemical method using cocoyl glutamic acid as raw material. The effects of nano-silver on the critical micelle concentration （cmc）, foaming properties, pH, Krafft point and wetting properties of the mixed system were studied by measurement of conductivity, surface tension and contact angle and by Ross foam analyzer. The results showed that nano-silver could enhance the foaming performance and foam stability of the system. With the increase of the amount of nano-silver, the cmc was first decreased and then increased, and the foaming performance was first enhanced and then decreased, while no significant effects on pH, Krafft point or wetting performance were observed. In this experiment, 5% of 50 mg/kg nano-silver had excellent synergistic effect on the surface activity of TEA-cocoyl glutamate. The mechanism of nano-silver was explored by UV-Vis, FT-IR and Zeta potential. The results showed that the nano-silver did not dissociate in the system. And with the increase of its dosage, the nano-silver tended to adsorb near the N-H bond by electrostatic interaction, resulting in a coordination effect. The physical adsorption of nano-silver in this mixed system was greater than chemical adsorption. It was also found that with the increase of the amount of nano-silver, the absolute value of Zeta potential of the mixed system was decreased, but the absolute value of Zeta potential was greater than 50 mV, indicating that the mixed system of nano-silver/cocoyl glutamic acid triethanolamine had good stability.

Key words: nano silver, TEA-cocoyl glutamate, cmc, foaming performance, Zeta potential

CLC Number:

TQ423

Yu Dongxiu,Jin Xiangxin,Liu Jiaxin,Li Junlang. Effects of nano-silver on the surface activity of triethanolammonium cocoyl glutamate[J].China Surfactant Detergent & Cosmetics, 2022, 52(4): 363-369.

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	cmc/ （g/L）	γ_cmc/ （mN/m）	Г_m/ （mol/m²）	a_m/ nm²
对照组	1.60	23.20	3.17×10^-6	0.523 8
3%纳米银组	1.35	23.30	4.51×10^-6	0.368 2
5%纳米银组	1.05	24.05	5.13×10^-6	0.323 7
8%纳米银组	1.50	24.20	3.43×10^-6	0.484 1

Effects of nano-silver on the surface activity of triethanolammonium cocoyl glutamate

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