Jeffrey Christopher Everts (Author), Bohdan Senyuk (Author), Haridas Mundoor (Author), Miha Ravnik (Author), Ivan I. Smalyukh (Author)

Abstract

The physical behavior of anisotropic charged colloids is determined by their material dielectric anisotropy, affecting colloidal self-assembly, biological function, and even out-of-equilibrium behavior. 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.

Keywords

elektrostatika;nematski elektroliti;koloidi;fizika mehke snovi;electrostatics;nematic electrolytes;colloids;soft matter physics;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FMF - Faculty of Mathematics and Physics
UDC: 537.2
COBISS: 49147651 Link will open in a new window
ISSN: 2375-2548
Views: 324
Downloads: 153
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Other data

Secondary language: Slovenian
Secondary keywords: elektrostatika;nematski elektroliti;koloidi;fizika mehke snovi;
Pages: 12 str.
Volume: ǂVol. ǂ7
Issue: ǂart. no. ǂeabd0662
Chronology: Jan. 2021
DOI: 10.1126/sciadv.abd0662
ID: 12512665