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Title: Spatially varying colloidal phase behavior on multi-dimensional energy landscapes

Abstract

A method is reported to determine equilibrium concentration profiles and local phase behavior for colloids on multi-dimensional energy landscapes. A general expression is derived based on local particle concentration and osmotic pressure differences that are balanced by forces on colloids due to energy landscape gradients. This analysis is applied to colloidal particles in high frequency AC electric fields within octupolar electrodes, where the energy landscape can be shaped in two dimensions. These results are also directly applicable to any particles having induced dipoles in spatially non-uniform electromagnetic fields. Predictions based on modelling colloids with an effective hard disk equation of state indicate inhomogeneous solid and fluid states coexisting on different shaped energy landscapes including multiple minima. Model predictions show excellent agreement with time-averaged Brownian Dynamic simulations at equilibrium. Findings demonstrate a general approach to understand colloidal phase behavior on energy landscapes due to external fields, which could enable control of colloidal microstructure on morphing energy landscapes and the inverse design of fields to assemble hierarchically structured colloidal materials.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Research Org.:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1599609
Alternate Identifier(s):
OSTI ID: 1597143
Grant/Contract Number:  
SC0017892
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 152; Journal Issue: 5; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Zhang, Jianli, Zhang, Yuanxing, and Bevan, Michael A. Spatially varying colloidal phase behavior on multi-dimensional energy landscapes. United States: N. p., 2020. Web. https://doi.org/10.1063/1.5142609.
Zhang, Jianli, Zhang, Yuanxing, & Bevan, Michael A. Spatially varying colloidal phase behavior on multi-dimensional energy landscapes. United States. https://doi.org/10.1063/1.5142609
Zhang, Jianli, Zhang, Yuanxing, and Bevan, Michael A. Tue . "Spatially varying colloidal phase behavior on multi-dimensional energy landscapes". United States. https://doi.org/10.1063/1.5142609. https://www.osti.gov/servlets/purl/1599609.
@article{osti_1599609,
title = {Spatially varying colloidal phase behavior on multi-dimensional energy landscapes},
author = {Zhang, Jianli and Zhang, Yuanxing and Bevan, Michael A.},
abstractNote = {A method is reported to determine equilibrium concentration profiles and local phase behavior for colloids on multi-dimensional energy landscapes. A general expression is derived based on local particle concentration and osmotic pressure differences that are balanced by forces on colloids due to energy landscape gradients. This analysis is applied to colloidal particles in high frequency AC electric fields within octupolar electrodes, where the energy landscape can be shaped in two dimensions. These results are also directly applicable to any particles having induced dipoles in spatially non-uniform electromagnetic fields. Predictions based on modelling colloids with an effective hard disk equation of state indicate inhomogeneous solid and fluid states coexisting on different shaped energy landscapes including multiple minima. Model predictions show excellent agreement with time-averaged Brownian Dynamic simulations at equilibrium. Findings demonstrate a general approach to understand colloidal phase behavior on energy landscapes due to external fields, which could enable control of colloidal microstructure on morphing energy landscapes and the inverse design of fields to assemble hierarchically structured colloidal materials.},
doi = {10.1063/1.5142609},
journal = {Journal of Chemical Physics},
number = 5,
volume = 152,
place = {United States},
year = {2020},
month = {2}
}

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