Attractions between charged colloids at water interfaces

Details Attractions between charged colloids at water interfaces Attractions between charged colloids at water interfaces

2005-04-18

arxiv.org/abs/cond-mat/0504434v2

J. Phys.: Condens. Matter 17 (2005) L337

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 1 figure, revised version (one paragraph added) accepted in JPCM

Scientific paper

10.1088/0953-8984/17/32/L02

The effective potential between charged colloids trapped at water interfaces is analyzed. It consists of a repulsive electrostatic and an attractive capillary part which asymptotically both show dipole--like behavior. For sufficiently large colloid charges, the capillary attraction dominates at large separations. The total effective potential exhibits a minimum at intermediate separations if the Debye screening length of water and the colloid radius are of comparable size.

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