Long-ranged attraction between disordered heterogeneous surfaces

Details Long-ranged attraction between disordered heterogeneous surfaces Long-ranged attraction between disordered heterogeneous surfaces

2011-09-22

arxiv.org/abs/1109.4715v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

Long-ranged attractions across water between two surfaces that are randomly covered with (mobile) positive and negative charge domains have been attributed to induced correlation of the charges (positive lining up with negative) as the surfaces approach. Here we show, by directly measuring normal forces under a rapid shear field, that these attractions may not in fact be due to such correlations. It is rather the inherent interaction-asymmetry between equally- and between oppositely-charged domains that results in the long-ranged attraction even in the complete absence of any charge correlation.

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