title: A Study of Thin Liquid Films as Related to the Stability of Crude Oil Emulsions.
abstract: In this paper, we report the influence of surface-active compounds on the stability of crude oil emulsions using the apparatus designed for bilayer lipid membrane studies. The results obtained show that natural surface-active materials in crude oil, such as petroleum acids and asphaltenes, play a pivotal role. The ionized acids formed by the reaction between the petroleum acids and the alkali can decrease the interfacial tension and accelerate the thinning as well as the breakdown of the thin liquid film. The asphaltenes can adsorb onto the interface and improve the stability of the film. The order of the stability of the films between crude oil and alkaline solutions is found to be as follows: crude oil with asphaltenes removed (ii) <crude oil (i) <crude oil with both asphaltenes and petroleum acids removed (iv) <crude oil with petroleum acids removed (iii). Copyright 2001 Academic Press.
authors.affiliation: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China
authors.forename: Hongbo
authors.initials: H
authors.lastname: Fang
authors.forename: Lu
authors.initials: L
authors.lastname: Zhang
authors.forename: Lan
authors.initials: L
authors.lastname: Luo
authors.forename: Sui
authors.initials: S
authors.lastname: Zhao
authors.forename: Jingyi
authors.initials: J
authors.lastname: An
authors.forename: Zhicheng
authors.initials: Z
authors.lastname: Xu
authors.forename: Jiayong
authors.initials: J
authors.lastname: Yu
authors.forename: Angelica
authors.initials: A
authors.lastname: Ottova
authors.forename: H. Ti
authors.initials: HT
authors.lastname: Tien