Anisotropic electrostatic screening of charged colloids in nematic solvents
| Autor: | Bohdan Senyuk, Haridas Mundoor, Jeffrey C. Everts, Miha Ravnik, Ivan I. Smalyukh |
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| Rok vydání: | 2021 |
| Předmět: |
endocrine system
Materials science Materials Science FOS: Physical sciences 02 engineering and technology Electrolyte Condensed Matter - Soft Condensed Matter complex mixtures 01 natural sciences symbols.namesake Physics::Plasma Physics Liquid crystal Physics - Chemical Physics Metastability Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Surface charge 010306 general physics Anisotropy Research Articles Debye length Chemical Physics (physics.chem-ph) Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics Physics digestive oral and skin physiology Isotropy SciAdv r-articles 021001 nanoscience & nanotechnology 3. Good health body regions Condensed Matter::Soft Condensed Matter Chemical physics symbols Soft Condensed Matter (cond-mat.soft) Particle 0210 nano-technology Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| DOI: | 10.1126/sciadv.abd0662 |
| Popis: | 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. Comment: 15 pages, 5 figures, SM under ancillary files |
| Databáze: | OpenAIRE |
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