Potential of Mean Force and Underscreening of Polarizable Colloids in Concentrated Electrolytes

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-06-18 DOI:10.1021/acs.nanolett.5c01541

Emily Krucker-Velasquez, Martin Z. Bazant, Alfredo Alexander-Katz, James W. Swan

引用次数: 0

Abstract

This study uses advanced numerical methods to estimate the mean force potential (PMF) between charged, polarizable colloidal particles in dense electrolytes. We observe that when the Debye screening length, λ_D, is below the hydrated ion size, the PMF shows discernible oscillations of purely electrostatic origin as opposed to chemical affinity, in addition to the expected exponential decay prescribed by Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Moreover, our findings suggest concentrated electrolytes are significantly less efficient at muting electrostatic interactions in electrostatically stabilized colloidal suspensions, potentially having significant implications for our understanding of colloidal stability and the forces that govern the behavior of concentrated charged soft matter systems beyond DLVO theory.

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浓电解质中平均力势和极化胶体的欠筛

本研究使用先进的数值方法来估计密集电解质中带电、极化胶体粒子之间的平均力势（PMF）。我们观察到，当Debye筛选长度λD低于水合离子尺寸时，PMF除了Derjaguin-Landau-Verwey-Overbeek （DLVO）理论所规定的指数衰减外，还表现出明显的纯静电振荡，而不是化学亲和。此外，我们的研究结果表明，在静电稳定的胶体悬浮液中，浓缩电解质在抑制静电相互作用方面的效率明显较低，这可能对我们理解胶体稳定性和超越DLVO理论的控制浓缩带电软物质系统行为的力具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.