Anisotropic electrostatic screening of charged colloids in nematic solvents
arXiv:2005.05682 · doi:10.1126/sciadv.abd0662
Abstract
The physical behaviour of anisotropic charged colloids is determined by their material dielectric anisotropy, affecting colloidal self-assembly, biological function and even out-of-equilibrium behaviour. However, little is known about anisotropic electrostatic screening, which underlies all electrostatic effective interactions in such soft or biological materials. In this work, we demonstrate anisotropic electrostatic screening for charged colloidal particles in a nematic electrolyte. We show that material anisotropy behaves markedly different from particle anisotropy: The electrostatic potential and pair interactions decay with an anisotropic Debye screening length, contrasting the constant screening length for isotropic electrolytes. Charged dumpling-shaped near-spherical colloidal particles in a nematic medium are used as an experimental model system to explore the effects of anisotropic screening, demonstrating competing anisotropic elastic and electrostatic effective pair interactions for colloidal surface charges tunable from neutral to high, yielding particle-separated metastable states. Generally, our work contributes to the understanding of electrostatic screening in nematic anisotropic media.
arXiv comment15 pages, 5 figures, SM under ancillary files
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- Stokes drag on a sphere in a three-dimensional anisotropic porous medium
- Interactions of charged microrods in chiral nematic liquid crystals
- Linear odd electrophoresis of a sphere in a charged chiral active fluid