Deformable particles with anisotropic interactions: unusual field-induced structural transitions in ultrasoft ionic microgel colloids
Mohanty, Priti LU ; Yethiraj, Anand and Schurtenberger, Peter LU
(2012)
In Soft Matter
8(42).
p.10819-10822
- Abstract
- Ionic microgels are intriguing soft and deformable colloids with an effective pair potential that crosses over from Yukawa-like at large distances to a much softer repulsive interaction at short distances. Here we report the effect of adding an anisotropic dipolar contribution to colloids with such "ultra-soft" interactions. We use an alternating electric field to induce a tunable dipolar contribution, and study the resulting particle self-assembly and phase transitions in situ with confocal laser scanning microscopy. We find significant field-induced structural transitions at low as well as at very high effective volume fractions. At phi(eff) = 0.1 we observe a transition from an isotropic to a string fluid. At phi(eff) = 0.85, there is a... (More)
- Ionic microgels are intriguing soft and deformable colloids with an effective pair potential that crosses over from Yukawa-like at large distances to a much softer repulsive interaction at short distances. Here we report the effect of adding an anisotropic dipolar contribution to colloids with such "ultra-soft" interactions. We use an alternating electric field to induce a tunable dipolar contribution, and study the resulting particle self-assembly and phase transitions in situ with confocal laser scanning microscopy. We find significant field-induced structural transitions at low as well as at very high effective volume fractions. At phi(eff) = 0.1 we observe a transition from an isotropic to a string fluid. At phi(eff) = 0.85, there is a reversible transition from an amorphous to a dipolar crystalline state, followed by the onset of a gas-(string) solid coexistence. At phi(eff) = 1.6 and 2.0, i.e. far above close packing, evidence for a field-induced arrested phase separation is found. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3283276
- author
- Mohanty, Priti
LU
; Yethiraj, Anand
and Schurtenberger, Peter
LU
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Soft Matter
- volume
- 8
- issue
- 42
- pages
- 10819 - 10822
- publisher
- Royal Society of Chemistry
- external identifiers
-
- wos:000310829400003
- scopus:84867378369
- ISSN
- 1744-6848
- DOI
- 10.1039/c2sm26729b
- language
- English
- LU publication?
- yes
- id
- d5dfd280-d93d-47ad-94d0-a10575bb9090 (old id 3283276)
- date added to LUP
- 2016-04-01 14:36:20
- date last changed
- 2022-04-06 19:29:18
@article{d5dfd280-d93d-47ad-94d0-a10575bb9090,
abstract = {{Ionic microgels are intriguing soft and deformable colloids with an effective pair potential that crosses over from Yukawa-like at large distances to a much softer repulsive interaction at short distances. Here we report the effect of adding an anisotropic dipolar contribution to colloids with such "ultra-soft" interactions. We use an alternating electric field to induce a tunable dipolar contribution, and study the resulting particle self-assembly and phase transitions in situ with confocal laser scanning microscopy. We find significant field-induced structural transitions at low as well as at very high effective volume fractions. At phi(eff) = 0.1 we observe a transition from an isotropic to a string fluid. At phi(eff) = 0.85, there is a reversible transition from an amorphous to a dipolar crystalline state, followed by the onset of a gas-(string) solid coexistence. At phi(eff) = 1.6 and 2.0, i.e. far above close packing, evidence for a field-induced arrested phase separation is found.}},
author = {{Mohanty, Priti and Yethiraj, Anand and Schurtenberger, Peter}},
issn = {{1744-6848}},
language = {{eng}},
number = {{42}},
pages = {{10819--10822}},
publisher = {{Royal Society of Chemistry}},
series = {{Soft Matter}},
title = {{Deformable particles with anisotropic interactions: unusual field-induced structural transitions in ultrasoft ionic microgel colloids}},
url = {{http://dx.doi.org/10.1039/c2sm26729b}},
doi = {{10.1039/c2sm26729b}},
volume = {{8}},
year = {{2012}},
}