Anisotropic electrostatic screening of charged colloids in nematic solvents
Everts, Jeffrey Christopher (Author), Senyuk, Bohdan (Author), Mundoor, Haridas (Author), Ravnik, Miha (Author), Smalyukh, Ivan I. (Author)

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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:electrostatics, nematic electrolytes, colloids, soft matter physics
Tipology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Number of pages:12 str.
Numbering:Vol. 7, art. no. eabd0662
ISSN on article:2375-2548
DOI:10.1126/sciadv.abd0662 Link is opened in a new window
COBISS.SI-ID:49147651 Link is opened in a new window
License:CC BY 4.0
This work is available under this license: Creative Commons Attribution 4.0 International
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Record is a part of a journal

Title:Science advances
Publisher:American Association for the Advancement of Science
COBISS.SI-ID:523392025 This link opens in a new window

Document is financed by a project

Funder:EC - European Commission
Funding Programme:H2020
Project no.:795377
Name:Topological Colloidal Double Layers

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P1-0099
Name:Fizika mehkih snovi, površin in nanostruktur

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:J1-1697
Name:Študij sil znotraj celic s pomočjo deformacij fotonskih kapljic

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:L1-8135
Name:Biološka zdravila: detektor tvorbe proteinskih delcev na osnovi tekočih kristalov

Secondary language

Keywords:elektrostatika, nematski elektroliti, koloidi, fizika mehke snovi

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