Three-dimensional non-close-packed structures of oppositely charged colloids driven by pH oscillation

The implementation of non-close-packed structures in colloids is challenging. Using Brownian dynamics simulations, we study the nonequilibrium self-assembly in suspensions of oppositely charged particles, whose charge magnitude is responsive to the pH of the solution. Under the fast pH-oscillating c...

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Main Authors: Lei, Qun-li, Ren, Chun-lai, Long, Cheng, Ma, Yu-qiang
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2019
Subjects:
Online Access:https://hdl.handle.net/10356/90000
http://hdl.handle.net/10220/48367
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-900002023-12-29T06:50:57Z Three-dimensional non-close-packed structures of oppositely charged colloids driven by pH oscillation Lei, Qun-li Ren, Chun-lai Long, Cheng Ma, Yu-qiang School of Chemical and Biomedical Engineering Colloids DRNTU::Engineering::Chemical engineering pH Oscillation The implementation of non-close-packed structures in colloids is challenging. Using Brownian dynamics simulations, we study the nonequilibrium self-assembly in suspensions of oppositely charged particles, whose charge magnitude is responsive to the pH of the solution. Under the fast pH-oscillating condition, various non-close-packed (e.g., graphitelike and diamondlike) structures are obtained. Here, changing the amplitude of the pH oscillation is an effective way to fabricate colloidal dynamic structures. To clarify the underlying mechanism of the dynamic self-assembly, the analysis of effective potential is adopted. A dimensionless parameter, the ratio of effective repulsion and attraction, is introduced to reflect the subtle interactions in the system. We find that the imbalance between repulsion and attraction is the cause of structural diversity. Madelung energy is used to study the stability of these structures. Our results provide a new way to fabricate non-close-packed structures in colloids, which has potential applications in the synthesis of photonic crystals. Accepted version 2019-05-24T08:38:40Z 2019-12-06T17:38:24Z 2019-05-24T08:38:40Z 2019-12-06T17:38:24Z 2018 Journal Article Long, C., Lei, Q., Ren, C., & Ma, Y. (2018). Three-dimensional non-close-packed structures of oppositely charged colloids driven by pH oscillation. The Journal of Physical Chemistry B, 122(12), 3196-3201. doi:10.1021/acs.jpcb.8b00441 1520-6106 https://hdl.handle.net/10356/90000 http://hdl.handle.net/10220/48367 10.1021/acs.jpcb.8b00441 en The Journal of Physical Chemistry B © 2018 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry B, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcb.8b00441 17 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Colloids
DRNTU::Engineering::Chemical engineering
pH Oscillation
spellingShingle Colloids
DRNTU::Engineering::Chemical engineering
pH Oscillation
Lei, Qun-li
Ren, Chun-lai
Long, Cheng
Ma, Yu-qiang
Three-dimensional non-close-packed structures of oppositely charged colloids driven by pH oscillation
description The implementation of non-close-packed structures in colloids is challenging. Using Brownian dynamics simulations, we study the nonequilibrium self-assembly in suspensions of oppositely charged particles, whose charge magnitude is responsive to the pH of the solution. Under the fast pH-oscillating condition, various non-close-packed (e.g., graphitelike and diamondlike) structures are obtained. Here, changing the amplitude of the pH oscillation is an effective way to fabricate colloidal dynamic structures. To clarify the underlying mechanism of the dynamic self-assembly, the analysis of effective potential is adopted. A dimensionless parameter, the ratio of effective repulsion and attraction, is introduced to reflect the subtle interactions in the system. We find that the imbalance between repulsion and attraction is the cause of structural diversity. Madelung energy is used to study the stability of these structures. Our results provide a new way to fabricate non-close-packed structures in colloids, which has potential applications in the synthesis of photonic crystals.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Lei, Qun-li
Ren, Chun-lai
Long, Cheng
Ma, Yu-qiang
format Article
author Lei, Qun-li
Ren, Chun-lai
Long, Cheng
Ma, Yu-qiang
author_sort Lei, Qun-li
title Three-dimensional non-close-packed structures of oppositely charged colloids driven by pH oscillation
title_short Three-dimensional non-close-packed structures of oppositely charged colloids driven by pH oscillation
title_full Three-dimensional non-close-packed structures of oppositely charged colloids driven by pH oscillation
title_fullStr Three-dimensional non-close-packed structures of oppositely charged colloids driven by pH oscillation
title_full_unstemmed Three-dimensional non-close-packed structures of oppositely charged colloids driven by pH oscillation
title_sort three-dimensional non-close-packed structures of oppositely charged colloids driven by ph oscillation
publishDate 2019
url https://hdl.handle.net/10356/90000
http://hdl.handle.net/10220/48367
_version_ 1787136701021290496