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Citation: Sun Tao-Lei, Peng Bo, Xu Zhi-Ming, Zhang Lu, Zhao Sui, Li Ming-Yuan, Yu Jia-Yong. Dilational Viscoelasticity of Interfacial Film Formed by Active Components of Crude Oil at Oil/Water Interface[J]. Acta Physico-Chimica Sinica, ;2002, 18(02): 161-165. doi: 10.3866/PKU.WHXB20020214 shu

Dilational Viscoelasticity of Interfacial Film Formed by Active Components of Crude Oil at Oil/Water Interface

1.
Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing　100101;State Key Laboratory of Heavy Oil Processing, University of Petroleum,Beijing　102200

Received Date: 10 July 2001
Available Online: 15 February 2002

The dilational viscoelasticity of the interfacial film formed by interfacial active components of crude oil at n-decane/water interface was investigated.The interfacial active components was obtained by supercritical fluid extraction and fractionation(SFEF) method from Iranian heavy oil.The properties of the two samples that have different average molecular weights and the influence of temperature on these properties were studied.The results show that the sample of higher average molecular weight has higher dynamic interfacial dilational activity.From the slope of the lg|ε|～lgω curve and the result of phase angle we can infer that the primary relaxation mechanism is not of diffusion-control but perhaps of adsorption-barrier-control.Temperature profoundly influences the dilational viscoelasticity of interfacial films of the two samples.Increasing temperature decreases the amplitude of dilational modulus and viscosity of the film,and alter the frequency response of phase angle of dilational modulus.
- Interfacial dilational viscoelasticity;Interfacial relaxation;　Surface active component;Supercritical fluid extraction and fractionation;Crude oil
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