Flow electrification in nonaqueous colloidal suspensions, studied with video microscopy

Langmuir : the ACS Journal of Surfaces and Colloids
V A TolpekinJ Mellema

Abstract

Flow electrification in nonaqueous suspensions has been scarcely reported in the literature but can significantly affect colloidal stability and (phase) behavior, perhaps even without being recognized. We have observed it in shear flow experiments on concentrated binary suspensions of hydrophobized silica particles in chloroform. In this low-polarity solvent, electrical charges on the large-particles' surfaces manifest themselves via long-ranged forces, because hardly any screening can take place through counterions. By shearing the suspension for a prolonged time, we could demonstrate that the effective interactions between the large particles change from weakly attractive (due to the small particles) to strongly repulsive (due to acquired Coulomb interactions). One of the conditions required for flow electrification was the presence of a glass surface in the shear cell. A spectacular manifestation of the phenomenon was observed with confocal video microscopy. First, the formation of large-particle aggregates was seen, while subsequently (over a long shearing time) the aggregates disintegrated into small entities, mostly primary particles. The spatial distribution of these entities in the quiescent state after stopping the flo...Continue Reading

Citations

Nov 29, 2012·Physical Chemistry Chemical Physics : PCCP·Gregory N Smith, Julian Eastoe
Jun 10, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·G Seth RobertsPaul Bartlett
Nov 20, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Qiong GuoSven Holger Behrens
Oct 15, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Carlos E EspinosaSven H Behrens

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