Screening of heterogeneous surfaces: charge renormalization of Janus particles

Details Screening of heterogeneous surfaces: charge renormalization of Janus particles Screening of heterogeneous surfaces: charge renormalization of Janus particles

2009-04-16

arxiv.org/abs/0904.2532v2

Physics

Condensed Matter

Soft Condensed Matter

2 figures

Scientific paper

Nonlinear ionic screening theory for heterogeneously charged spheres is developed in terms of a mode-decomposition of the surface charge. A far-field analysis of the resulting electrostatic potential leads to a natural generalization of charge renormalization from purely monopolar to dipolar, quadropolar, etc., including mode-couplings. Our novel scheme is generally applicable to large classes of surface heterogeneities, and is explicitly applied here to Janus spheres with differently charged upper and lower hemispheres, revealing strong renormalization effects for all multipoles.

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