Self-Assembly of Ionic Microgels Driven by an Alternating Electric Field : Theory, Simulations, and Experiments
Colla, Thiago ; Mohanty, Priti S. LU ; Nöjd, Sofi LU ; Bialik, Erik LU ; Riede, Aaron ; Schurtenberger, Peter LU
and Likos, Christos N.
(2018)
In ACS Nano
12(5).
p.4321-4337
- Abstract
The structural properties of a system of ionic microgels under the influence of an alternating electric field are investigated both theoretically and experimentally. This combined investigation aims to shed light on the structural transitions that can be induced by changing either the driving frequency or the strength of the applied field, which range from string-like formation along the field to crystal-like structures across the orthogonal plane. In order to highlight the physical mechanisms responsible for the observed particle self-assembly, we develop a coarse-grained description, in which effective interactions among the charged microgels are induced by both equilibrium ionic distributions and their time-averaged hydrodynamic... (More)
The structural properties of a system of ionic microgels under the influence of an alternating electric field are investigated both theoretically and experimentally. This combined investigation aims to shed light on the structural transitions that can be induced by changing either the driving frequency or the strength of the applied field, which range from string-like formation along the field to crystal-like structures across the orthogonal plane. In order to highlight the physical mechanisms responsible for the observed particle self-assembly, we develop a coarse-grained description, in which effective interactions among the charged microgels are induced by both equilibrium ionic distributions and their time-averaged hydrodynamic responses to the applied field. These contributions are modeled by the buildup of an effective dipole moment at the microgels backbones, which is partially screened by their ionic double layer. We show that this description is able to capture the structural properties of this system, allowing for very good agreement with the experimental results. The model coarse-graining parameters are indirectly obtained via the measured pair distribution functions and then further assigned with a clear physical interpretation, allowing us to highlight the main physical mechanisms accounting for the observed self-assembly behavior.
(Less)
- author
- Colla, Thiago
; Mohanty, Priti S.
LU
; Nöjd, Sofi
LU
; Bialik, Erik
LU
; Riede, Aaron
; Schurtenberger, Peter
LU
and Likos, Christos N.
- organization
- publishing date
- 2018-05-22
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- chain formation, coarse-graining, confocal microscopy, dipoles, ionic microgels, self-assembly, soft colloids
- in
- ACS Nano
- volume
- 12
- issue
- 5
- pages
- 17 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- pmid:29634232
- scopus:85047402092
- ISSN
- 1936-0851
- DOI
- 10.1021/acsnano.7b08843
- language
- English
- LU publication?
- yes
- id
- ea823e5e-c84b-4975-8313-8d69225db5e4
- date added to LUP
- 2018-06-05 12:02:52
- date last changed
- 2024-04-01 06:37:29
@article{ea823e5e-c84b-4975-8313-8d69225db5e4,
abstract = {{<p>The structural properties of a system of ionic microgels under the influence of an alternating electric field are investigated both theoretically and experimentally. This combined investigation aims to shed light on the structural transitions that can be induced by changing either the driving frequency or the strength of the applied field, which range from string-like formation along the field to crystal-like structures across the orthogonal plane. In order to highlight the physical mechanisms responsible for the observed particle self-assembly, we develop a coarse-grained description, in which effective interactions among the charged microgels are induced by both equilibrium ionic distributions and their time-averaged hydrodynamic responses to the applied field. These contributions are modeled by the buildup of an effective dipole moment at the microgels backbones, which is partially screened by their ionic double layer. We show that this description is able to capture the structural properties of this system, allowing for very good agreement with the experimental results. The model coarse-graining parameters are indirectly obtained via the measured pair distribution functions and then further assigned with a clear physical interpretation, allowing us to highlight the main physical mechanisms accounting for the observed self-assembly behavior.</p>}},
author = {{Colla, Thiago and Mohanty, Priti S. and Nöjd, Sofi and Bialik, Erik and Riede, Aaron and Schurtenberger, Peter and Likos, Christos N.}},
issn = {{1936-0851}},
keywords = {{chain formation; coarse-graining; confocal microscopy; dipoles; ionic microgels; self-assembly; soft colloids}},
language = {{eng}},
month = {{05}},
number = {{5}},
pages = {{4321--4337}},
publisher = {{The American Chemical Society (ACS)}},
series = {{ACS Nano}},
title = {{Self-Assembly of Ionic Microgels Driven by an Alternating Electric Field : Theory, Simulations, and Experiments}},
url = {{http://dx.doi.org/10.1021/acsnano.7b08843}},
doi = {{10.1021/acsnano.7b08843}},
volume = {{12}},
year = {{2018}},
}