有机硅表面活性剂在乙醇-水体系中的起泡机制研究

doi:10.3969/j.issn.1001-1803.2021.02.001

Abstract

Abstract:

The structure and liquid content of the foams, and the surface elasticity of films of a silicone surfactant FC-7160 and several hydrocarbon surfactants in 50% ethanol-aqueous media were studied. The results showed that, compared with the situation in water, the bubbles of FC-7160 in mixed solvent of 50% ethanol-water were smaller and nearly spherical, and the liquid content was higher; the dilatational modulus of hydrocarbon surfactants in aqueous ethanol solution were 0 mN/m, indicating that the foam films had no surface elasticity in 50% ethanol-aqueous media. However, the surface elasticity of FC-7160 in 50% ethanol-aqueous media was high, indicative of a more compact molecular arrangement which not only increased the surface viscosity but also enhanced the liquid film strength, so FC-7160 could form stable foam in the 50% ethanol-aqueous media.

Key words: ethanol-aqueous solution, foam, surface tension, interfacial elasticity

CLC Number:

TQ423

NIU Qi-qi,BAI Yan-yun,TAI Xiu-mei,WANG Wan-xu,WANG Guo-yong. Study of the foaming mechanism of a silicone surfactant in ethanol-aqueous system[J].China Surfactant Detergent & Cosmetics, 2021, 51(2): 83-88.

Figures/Tables 6

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References 20

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表面活性剂	临界胶束浓度/（mg·L^-1）		最低表面张力/（mN·m^-1）
表面活性剂	水溶液	50%乙醇-水溶液	水溶液	50%乙醇-水溶液
FC-7160	141.4	43.1	24.0	22.8
AES-3	191.2	—	28.0	—
AEO-9	20.8	—	30.4	—
CAB	66.5	—	27.8	—

Study of the foaming mechanism of a silicone surfactant in ethanol-aqueous system

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