Stability of Colloidal Gas Aphrons Prepared Solely by Nonionic Surfactant

Chem. J. Chinese Universities

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Stability of Colloidal Gas Aphrons Prepared Solely by Nonionic Surfactant

YAN Yong-Li^1*, HE Fei¹, ZHANG Jia-Ming², QU Cheng-Tun¹, ZHANG Ning-Sheng¹

1. College of Chemistry & Chemical Engineering, Xi’an Shiyou University, Xi’an 710065, China;
2. Shaanxi Yanchang Petroleum Co. Ltd., Yan’an 717208, China

Received:2008-03-10 Revised:1900-01-01 Online:2008-10-10 Published:2008-10-10
Contact: YAN Yong-Li

Abstract

Abstract: Stable colloidal gas aphrons(CGA) were prepared solely by polyoxyethylene-type nonionic surfactant(C₁₂EO_n). Four different EO chain lengths namely C₁₂EO₃, C₁₂EO₅, C₁₂EO₇ and C₁₂EO₉ were considered. The microstructure and rheological properties on these colloidal systems were studied via optical microscopy and viscosimeter in attempt to explore the stability mechanisms. The experimental results suggest that CGA stabilized solely by C₁₂EO₃ and C₁₂EO₅ respectively exhibit the presence of lamellar liquid crystal adsorbed at the air/liquid interface, and could maintain more than 20 h without occurrence of collapse. In the case of CGA generated from C₁₂EO₇ and C₁₂EO₉, respectively, there is not any optical fine structure between two air bubbles and thus have a poor stability only for several minutes. It is concluded that the stability of CGA stabilized solely by C₁₂EO_n surfactants is attributed to the presence of lamellar liquid crystalline phases located at the gas/liquid interface. The role of liquid crystal in stabilizing CGA could be explained in several mechanisms including hydrodynamic drainage, the mechanical strength of the liquid film and the diffusion rate of entrapped gas.

Key words: Colloidal gas aphron(CGA), Polyethylene glycol monododecyl ether(C₁₂EO_n), Stability, Lamellar liquid crystal, Rheology

CLC Number:

O648.2

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YAN Yong-Li^1*, HE Fei¹, ZHANG Jia-Ming², QU Cheng-Tun¹, ZHANG Ning-Sheng¹. Stability of Colloidal Gas Aphrons Prepared Solely by Nonionic Surfactant[J]. Chem. J. Chinese Universities, doi: .

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Stability of Colloidal Gas Aphrons Prepared Solely by Nonionic Surfactant

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