标题：Effect of liquid paraffin on the stability of aqueous foam in the presence and absence of electrolytes
作者：Dong, Xiaoqiang; Sun, Dejun; Zhang, Huawei; Cao, Chengbo; Xu, Jian; Jiang, Xiren
作者机构：[Dong, Xiaoqiang; Sun, Dejun; Xu, Jian] Shandong Univ, Key Lab Colloid & Interface Chem, Educ Minist, Jinan 250100, Shandong, Peoples R China.; [Zha 更多
通讯作者地址：[Cao, CB]73 Jingshi Rd, Jinan, Shandong, Peoples R China.
来源：COLLOID AND POLYMER SCIENCE
关键词：Foam stability; Film; Electrolyte surfactant; Liquid paraffin
摘要：The foam stability of dodecyl diphenyl ether disulfonate solution with liquid paraffin droplets in the presence and absence of electrolytes was evaluated, and the stabilization mechanisms were deduced. The foam film is stabilized when the monovalent and divalent counterion concentration is lower than a critical value. However, the foam stability declined with the addition of trivalent counterions. There are two mechanisms we have speculated. Firstly, the counterions reduce the repulsive interaction between the polar groups of surfactants adsorbed at the air/water and oil/water interfaces in the pseudo-emulsion film. Secondly, comparing with the monovalent counterions, the multivalent counterions are not only able to interconnect head groups of adjacent ionic surfactant molecules which are adsorbed at the air/water or oil/water interface, but also to attract the couples of neighboring surfactant head groups adsorbed at the air/water and oil/water interfaces. The attractive interaction between both the interfaces promotes the emulsified droplets piercing the air/water interface.