Random charge variations at the bitumen-water interface: Characterization by autocorrelation

被引：9

作者：

Lin, Feng ^{[1
]}

Esmaeili, Payman ^{[1
]}

Long, Jun ^{[2
]}

Bara, Barry ^{[2
]}

Yeung, Anthony ^{[1
]}

机构：

[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2V4, Canada

[2] Syncrude Canada Ltd, Edmonton Res Ctr, Edmonton, AB T6N 1H4, Canada

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2014年 / 451卷

关键词：

Surface charge heterogeneity; Bitumen; Autocorrelation; Atomic force microscopy; Surface charge microscopy; COLLOIDAL PARTICLES; SURFACE; FORCES; STABILITY; NONUNIFORMITY; MICROSCOPY; SYSTEMS; SPHERES;

D O I：

10.1016/j.colsurfa.2014.03.045

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Atomic force microscopy was used to measure local surface potentials (or equivalently, surface charges) at the bitumen-water interface. When plotted as a function of position along the bitumen surface, the potential appeared as a random "noise." Autocorrelation of the random noise revealed that the surface charges were correlated over distances much larger than molecular dimensions. Further, this correlation length appeared to be pH-dependent, exhibiting an almost threefold decrease as the pH was increased from 6 to 10. The correlation length, which is a measure of surface charge heterogeneity, is of practical importance as it affects strongly the probability of coalescence between emulsified bitumen droplets. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：144 / 150

页数：7

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