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Phase Behavior of Bowl-Shaped Colloids : Order and Dynamics in Plastic Crystals and Glasses

Meijer, Janne Mieke LU and Crassous, Jérôme J. LU (2018) In Small 14(46).
Abstract

Charged fluorescent bowl-shaped colloids consisting of a polystyrene core surrounded by a poly(N-isopropylmethacrylamide) shell are obtained by nanoengineering spherical composite microgels. The phase diagram of these soft bowl-shaped colloids interacting through long-range Yukawa-type interactions is investigated using confocal laser scanning microscopy. The bowl-shaped structure leads to marked differences in phase-behavior compared to their spherical counterpart. With increasing number density, a transition from a fluid to a plastic crystal phase, with freely rotating particles, followed by a glass-like state is observed. It is found that the anisotropic bowl shape frustrates crystallization and slows down crystallization kinetics... (More)

Charged fluorescent bowl-shaped colloids consisting of a polystyrene core surrounded by a poly(N-isopropylmethacrylamide) shell are obtained by nanoengineering spherical composite microgels. The phase diagram of these soft bowl-shaped colloids interacting through long-range Yukawa-type interactions is investigated using confocal laser scanning microscopy. The bowl-shaped structure leads to marked differences in phase-behavior compared to their spherical counterpart. With increasing number density, a transition from a fluid to a plastic crystal phase, with freely rotating particles, followed by a glass-like state is observed. It is found that the anisotropic bowl shape frustrates crystallization and slows down crystallization kinetics and causes the glass-like transition to shift to a significantly lower volume fraction than for the spheres. Quantitative analysis of the positional and orientational order demonstrates that the plastic crystal phase exhibits quasi-long range translational order and orientational disorder, while in the disordered glass-like phase the long-range translational order vanishes and short-range rotational order appears, dictated by the specific bowl shape. It is further shown that the different structural transitions are characterized by decoupling of the translational and orientational dynamics.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
bowl-shaped colloids, Brownian dynamics, glass transition, image analysis, plastic crystal
in
Small
volume
14
issue
46
publisher
John Wiley & Sons
external identifiers
  • scopus:85052662280
ISSN
1613-6810
DOI
10.1002/smll.201802049
language
English
LU publication?
yes
id
8ca0fac4-ac49-4fe4-92aa-ed07ee888431
date added to LUP
2018-10-05 08:23:28
date last changed
2019-01-14 18:02:50
@article{8ca0fac4-ac49-4fe4-92aa-ed07ee888431,
  abstract     = {<p>Charged fluorescent bowl-shaped colloids consisting of a polystyrene core surrounded by a poly(N-isopropylmethacrylamide) shell are obtained by nanoengineering spherical composite microgels. The phase diagram of these soft bowl-shaped colloids interacting through long-range Yukawa-type interactions is investigated using confocal laser scanning microscopy. The bowl-shaped structure leads to marked differences in phase-behavior compared to their spherical counterpart. With increasing number density, a transition from a fluid to a plastic crystal phase, with freely rotating particles, followed by a glass-like state is observed. It is found that the anisotropic bowl shape frustrates crystallization and slows down crystallization kinetics and causes the glass-like transition to shift to a significantly lower volume fraction than for the spheres. Quantitative analysis of the positional and orientational order demonstrates that the plastic crystal phase exhibits quasi-long range translational order and orientational disorder, while in the disordered glass-like phase the long-range translational order vanishes and short-range rotational order appears, dictated by the specific bowl shape. It is further shown that the different structural transitions are characterized by decoupling of the translational and orientational dynamics.</p>},
  articleno    = {1802049},
  author       = {Meijer, Janne Mieke and Crassous, Jérôme J.},
  issn         = {1613-6810},
  keyword      = {bowl-shaped colloids,Brownian dynamics,glass transition,image analysis,plastic crystal},
  language     = {eng},
  month        = {08},
  number       = {46},
  publisher    = {John Wiley & Sons},
  series       = {Small},
  title        = {Phase Behavior of Bowl-Shaped Colloids : Order and Dynamics in Plastic Crystals and Glasses},
  url          = {http://dx.doi.org/10.1002/smll.201802049},
  volume       = {14},
  year         = {2018},
}