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A further investigation to mechanism of the electrorheological effect of waxy oils:Behaviors of charged particles under electric field

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Petroleum Science 2023年第2期20卷 1247-1254页

作者： Yi-Wei Xie Hong-Ying Li Chao-Yue Zhang Yang Su Qian Huang Feng Jiang Chao-Hui Chen Shan-Peng Han Jin-Jun Zhang National Engineering Research Center of Oil and Gas Pipeline Transportation Safety China University of PetroleumBeijing 102249China MOE Key Laboratory of Petroleum Engineering China University of PetroleumBeijing 102249China Beijing Key Laboratory of Urban Oil&Gas Distribution Technology China University of PetroleumBeijing 102249China PetroChina Planning and Engineering Institute Beijing 100083China

Exposing waxy oils to an electric field may significantly improve their cold *** previous study has shown that interfacial polarization,i.e.,charged particle accumulation on the wax particle surface,is the primary mechanism of the electrorheological behavior of waxy ***,the way that charged particles interact with wax particles under an electric field remains *** this study,we found no viscosity and impedance change for two waxy crude oils after their exposure to a high-voltage electric ***,the yield stresses were reduced *** thus proposed that the collision of colloidal particles such as resins and asphaltenes with the wax particles could be an essential mechanism that the wax particle structure was *** verify this hypothesis,a series of ad hoc experiments were carried out,i.e.,by performing electrorheological tests on model waxy oils containing additives removable under an electric field,including electrically-neutral colloidal particles(Fe3O4),charged colloidal particles(resins),and oil-soluble electrolyte(C22H14CoO4),respectively,and demonstrated that upon application of a high-voltage electric field,charged particles in a waxy oil may move and thus collide with wax particles,and consequently adhere to the wax particle *** particle collision results in damage to the wax particle network,and the electrostatic repulsion arising from the adhesion of the charged particle on the wax particle diminishes attraction between wax *** study clarifies the process of interfacial polarization.

关键词： Waxy oil electrorheological effect Interfacial polarization Charged particle motion

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ER effect of PMMA Wrapped Alumina-Siloxane Gel Doped with Rare Earths

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Journal of Rare Earths 2002年第1期20卷 23-27页

作者：邱关明周兰香张明李幼荣严长浩 Changchun College of Optics & Fine Mechanics Changchun 130022 China Department of Chemistry Yangzhou University Yangzhou 225002 China

PMMA wrapped alumina siloxane gel was obtained by using poly (methyl methacrylate) (PMMA) to wrap alumina siloxane sol which was made from water glass, aluminum nitrate and α methacrylic acid. Meanwhile, rare earth ions were used to dope in the course of reaction, and stable suspensions was produced by putting PMMA wrapped microcapsule powder doped with rare earths into methy silicon oil. It is found that its electrorheological (ER) effect improves strikingly after loading electric field. At a certain concentration, the immediate viscosity increases from 95 to 178 Pa·s compared to the system without doping.

关键词： rare earths water glass PMMA wrapped alumina siloxane gel suspensions electrorheological effect

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