摘要:

Compressibilities (Cs) and excess surface areas (ΔAM) are calculated for mixed films of asphaltenes and resins and asphaltenes combined with different commercial demulsifiers from Langmuir measurements. Both attraction and repulsion is observed between asphaltenes and resins, depending on the composition of the film. High molecular weight demulsifiers present in an asphaltene film increase the compressibility and the repulsion in the film, which is important for the demulsification process of water and crude oil emulsions.

ISSN:0193-2691    

DOI:10.1080/01932699908943894

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The estimation of the C-potential of ionic surfactant micelles may be useful for the study of adsorption of solutes onto the micellar surface, which causes a reduction of the net electrostatic charge. This work presents results on the variation of ζ-potential of alkylsulfate and fatty carboxylate micelles with the bulk concentrations of Al3+and Ca2+cations. Combined with results from the literature about the effect of micellar surfactant concentration on reducing surfactant precipitation in the presence of polyvalent cations, these allow to conclude that micelles of anionic surfactants will have a higher chance of electroneutralization of their surface charge by adsorbing cations if the end functional group of the surfactant is smaller.

ISSN:0193-2691    

DOI:10.1080/01932699908943895

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:0193-2691    

DOI:10.1080/01932699908943896

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor