Re-entrant solidification in polymer-colloid mixtures as a consequence of competing entropic and enthalpic attractions

Lang Feng, Bezia Laderman, Stefano Sacanna, Paul Chaikin

Research output: Contribution to journalArticle

Abstract

In polymer-colloid mixtures, non-adsorbing polymers dispersed with much larger colloids provide a universal yet specific entropic attraction between the colloids. Such so-called depletion interaction arises from an osmotic-pressure imbalance caused by the polymers and is considered to be independent of temperature. Here we show that, for the most commonly used polymer-colloid depletion systems, the polymer undergoes a crossover from non-adsorbing to adsorbing and that, consequently, the effective colloidal interactions depend on temperature. We also find that a combination of the enthalpic (polymer bridging) and entropic (polymer exclusion) interactions, both attractive, leads to a re-entrant regime where the colloids are dispersed and form solids both on heating and on cooling. We provide a simple model to explain the observed transitions and to fill the theoretical gap at the polymer-adsorption crossover. Our findings open possibilities for colloidal self-assembly, the formation of colloidal crystals and glasses, and the behaviour of temperature-controlled viscoelastic materials.

Original languageEnglish (US)
Pages (from-to)61-65
Number of pages5
JournalNature Materials
Volume14
Issue number1
DOIs
StatePublished - Jan 1 2015

Fingerprint

Colloids
solidification
attraction
Solidification
colloids
Polymers
polymers
crossovers
depletion
osmosis
interactions
exclusion
Temperature
Self assembly
temperature
self assembly
Cooling
cooling
Heating
Adsorption

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics
  • Materials Science(all)
  • Chemistry(all)

Cite this

Re-entrant solidification in polymer-colloid mixtures as a consequence of competing entropic and enthalpic attractions. / Feng, Lang; Laderman, Bezia; Sacanna, Stefano; Chaikin, Paul.

In: Nature Materials, Vol. 14, No. 1, 01.01.2015, p. 61-65.

Research output: Contribution to journalArticle

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