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Multiscale directed self-assembly of composite microgels in complex electric fields

Crassous, Jerome LU and Demirörs, Ahmet F. (2017) In Soft Matter 13(1). p.88-100
Abstract

This study explored the application of localized electric fields for reversible directed self-assembly of colloidal particles in 3 dimensions. Electric field microgradients, arising from the use of micro-patterned electrodes, were utilized to direct the localization and self-assembly of polarizable (charged) particles resulting from a combination of dielectrophoretic and multipolar forces. Deionized dispersions of spherical and ellipsoidal core-shell microgels were employed for investigating their assembly under an external alternating electric field. We demonstrated that the frequency of the field allowed for an exquisite control over the localization of the particles and their self-assembled structures near the electrodes. We extended... (More)

This study explored the application of localized electric fields for reversible directed self-assembly of colloidal particles in 3 dimensions. Electric field microgradients, arising from the use of micro-patterned electrodes, were utilized to direct the localization and self-assembly of polarizable (charged) particles resulting from a combination of dielectrophoretic and multipolar forces. Deionized dispersions of spherical and ellipsoidal core-shell microgels were employed for investigating their assembly under an external alternating electric field. We demonstrated that the frequency of the field allowed for an exquisite control over the localization of the particles and their self-assembled structures near the electrodes. We extended this approach to concentrated binary dispersions consisting of polarizable and less polarizable composite microgels. Furthermore, we utilized the thermosensitivity of the microgels to adjust the effective volume fraction and the dynamics of the system, which provided the possibility to dynamically “solidify” the assembly of the field-responsive particles by a temperature quench from their initial fluid state into an arrested crystalline state. Reversible solidification enables us to re-write/reconstruct various 3 dimensional assemblies by varying the applied field frequency.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
13
issue
1
pages
13 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85007143961
  • wos:000395374100008
ISSN
1744-683X
DOI
10.1039/C6SM00857G
language
English
LU publication?
yes
id
0d9655cb-7e77-498b-9948-d5074d61e75f
date added to LUP
2017-03-17 10:48:30
date last changed
2018-02-25 04:15:18
@article{0d9655cb-7e77-498b-9948-d5074d61e75f,
  abstract     = {<p>This study explored the application of localized electric fields for reversible directed self-assembly of colloidal particles in 3 dimensions. Electric field microgradients, arising from the use of micro-patterned electrodes, were utilized to direct the localization and self-assembly of polarizable (charged) particles resulting from a combination of dielectrophoretic and multipolar forces. Deionized dispersions of spherical and ellipsoidal core-shell microgels were employed for investigating their assembly under an external alternating electric field. We demonstrated that the frequency of the field allowed for an exquisite control over the localization of the particles and their self-assembled structures near the electrodes. We extended this approach to concentrated binary dispersions consisting of polarizable and less polarizable composite microgels. Furthermore, we utilized the thermosensitivity of the microgels to adjust the effective volume fraction and the dynamics of the system, which provided the possibility to dynamically “solidify” the assembly of the field-responsive particles by a temperature quench from their initial fluid state into an arrested crystalline state. Reversible solidification enables us to re-write/reconstruct various 3 dimensional assemblies by varying the applied field frequency.</p>},
  author       = {Crassous, Jerome and Demirörs, Ahmet F.},
  issn         = {1744-683X},
  language     = {eng},
  number       = {1},
  pages        = {88--100},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {Multiscale directed self-assembly of composite microgels in complex electric fields},
  url          = {http://dx.doi.org/10.1039/C6SM00857G},
  volume       = {13},
  year         = {2017},
}