Surface Fluctuations Dominate the Slow Glassy Dynamics of Polymer-Grafted Colloid Assemblies

Makoto Asai, Angelo Cacciuto, Sanat K. Kumar

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Colloids grafted with a corona layer of polymers show glassy behavior that covers a wide range of fragilities, with this behavior being tunable through variations in grafting density and grafting chain length. We find that the corona roughness, which is maximized for long chain lengths and sparse grafting, is directly correlated to the concentration-dependence of the system relaxation time (fragility). Relatively rougher colloids result in stronger liquids because their rotational motions become orientationally correlated across the whole system even at low particle loadings leading to an essentially Arrhenius-like concentration-dependence of the relaxation times near the glass transition. The smoother colloids do not show as much orientational correlation except at higher densities leading to fragile behavior. We therefore propose that these materials are an ideal model to study the physical properties of the glass transition.

Original languageEnglish
Pages (from-to)1179-1184
Number of pages6
JournalACS Central Science
Volume4
Issue number9
DOIs
Publication statusPublished - 2018 Sep 26
Externally publishedYes

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Colloids
Polymers
Chain length
Relaxation time
Glass transition
Physical properties
Surface roughness
Liquids

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Surface Fluctuations Dominate the Slow Glassy Dynamics of Polymer-Grafted Colloid Assemblies. / Asai, Makoto; Cacciuto, Angelo; Kumar, Sanat K.

In: ACS Central Science, Vol. 4, No. 9, 26.09.2018, p. 1179-1184.

Research output: Contribution to journalArticle

Asai, Makoto ; Cacciuto, Angelo ; Kumar, Sanat K. / Surface Fluctuations Dominate the Slow Glassy Dynamics of Polymer-Grafted Colloid Assemblies. In: ACS Central Science. 2018 ; Vol. 4, No. 9. pp. 1179-1184.
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