文献类型：期刊文献

英文题名：Layer-by-Layer Assembled Film of Asphaltenes/Polyacrylamide and Its Stability of Water-in-Oil Emulsions: A Combined Experimental and Simulation Study

作者：Duan, Ming[1,2];Song, Xianyu[3];Zhao, Shuangliang[4];Fang, Shenwen[1,2];Wang, Fen[5];Zhong, Cheng[3];Luo, Zhaoyang[3]

机构：[1]Southwest Petr Univ, Coll Chem & Chem Engn, Chengdu 610500, Peoples R China;[2]Oil & Gas Field Appl Chem Key Lab Sichuan Prov, Chengdu 610500, Peoples R China;[3]Dazhou Vocat & Tech Coll, Dept Mech & Elect Engn, Dazhou 635000, Sichuan, Peoples R China;[4]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[5]Sichuan Univ Arts & Sci, Sch Chem & Chem Engn, Dazhou 635000, Sichuan, Peoples R China

年份：2017

卷号：121

期号：8

起止页码：4332

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20171203458911);WOS:【SCI-EXPANDED(收录号:WOS:000395616200026)】；

基金：This work is supported by National Key Basic Research Program of China (2014CB748500), the National Natural Science Foundation of China (21376193 and 91434110), the Blue Fire Project from the National Department of Education (2014-LHJH-HSZX-015), and the Fundamental Research Funds for the Central Universities of China. S.Z. thanks Fok Ying Tong Education Foundation (151069) and also acknowledges the support of the Scientific Research Fund of the Sichuan Provincial Education Department (15ZA0363).

语种：英文

外文关键词：Dissipative particle dynamics - Emulsification - Asphaltenes - Polycyclic aromatic hydrocarbons - Rigid structures - Emulsions - Crude oil - Interfaces (materials)

摘要：Emulsions with interface-active components at the water/oil (w/o) interface are of fundamental and practical interest in many fields. Here we investigate the interfacial films of asphaltenes and asphaltenes/polyacrylamide (PAM) at the w/o interface of water-in-crude oil emulsions. With the combination of the dissipative particle dynamics simulation and experimental observation, the molecular interactions of asphaltenes and asphaltenes/PAM at the w/o interface are extensively analyzed. We show that the rigid mechanical film of asphaltenes originates from a rigid structure of polycyclic aromatic hydrocarbons (PAHs) and the pi-pi bonding interactions between the PAHs of asphaltenes, and at a higher concentration of asphaltenes, the nanoaggregates of asphaltenes, acting as a space fortress at the w/o interface, make the drop-drop coalescence more difficult. In addition, a layer-by-layer assembled architecture film of asphaltenes/polyacrylamide formed at the w/o interface is identified, and we observe that the inner layer is composed of PAM with a network structure and the outer layer is composed of rigid asphaltenes. While the rigidity and stability of this film are attributed to the viscoelasticity and rheology of PAM and the "synergy effect" between asphaltenes and PAM, its presence greatly enhances the stability of water-in-oil emulsions. We further conclude that PAM with higher concentrations and molecular weights can generate a more ordered network structure, leading to a more stable asphaltenes/PAM film at the w/o interface. This combined study provides helpful insight into the demulsification of water-in-oil emulsion.