Thermal melting in depletion gels of hairy nanoparticles

Domenico Truzzolillo, Dimitris Vlassopoulos, Mario Gauthier, Abdul Munam

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Under certain conditions, the addition of small non-adsorbing polymers to a suspension of large hard spheres yields a depletion gel. It is expected that, provided that solvent quality issues do not lead to phase separation, thermodynamics imposes an invariance of the hard-sphere depletion gel upon heating. We show here that this is not the case for depletion gels of soft hairy nanoparticles. Using multiarm star polymers as a model that encompasses the key features of a huge range of grafted colloids, we show that their microstructural details make the difference. In particular, their hybrid nature, consisting of a carbosilane core and a polymeric shell, gives rise to a mismatch in thermal expansion upon heating, which affects the nanoparticle's conformation in a way analogous to a dry-to-wet brush transition, and hence leads to thermal melting of the gel. These results open the route for the molecular design of new materials, providing new opportunities to colloid chemistry and processing.

Original languageEnglish
Pages (from-to)9088-9093
Number of pages6
JournalSoft Matter
Volume9
Issue number38
DOIs
Publication statusPublished - Oct 14 2013

Fingerprint

depletion
Melting
Gels
melting
gels
Nanoparticles
nanoparticles
colloids
Polymers
Colloid chemistry
Heating
heating
brushes
polymers
Colloids
Brushes
Invariance
Phase separation
Stars
Thermal expansion

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Truzzolillo, D., Vlassopoulos, D., Gauthier, M., & Munam, A. (2013). Thermal melting in depletion gels of hairy nanoparticles. Soft Matter, 9(38), 9088-9093. https://doi.org/10.1039/c3sm50731a

Thermal melting in depletion gels of hairy nanoparticles. / Truzzolillo, Domenico; Vlassopoulos, Dimitris; Gauthier, Mario; Munam, Abdul.

In: Soft Matter, Vol. 9, No. 38, 14.10.2013, p. 9088-9093.

Research output: Contribution to journalArticle

Truzzolillo, D, Vlassopoulos, D, Gauthier, M & Munam, A 2013, 'Thermal melting in depletion gels of hairy nanoparticles', Soft Matter, vol. 9, no. 38, pp. 9088-9093. https://doi.org/10.1039/c3sm50731a
Truzzolillo D, Vlassopoulos D, Gauthier M, Munam A. Thermal melting in depletion gels of hairy nanoparticles. Soft Matter. 2013 Oct 14;9(38):9088-9093. https://doi.org/10.1039/c3sm50731a
Truzzolillo, Domenico ; Vlassopoulos, Dimitris ; Gauthier, Mario ; Munam, Abdul. / Thermal melting in depletion gels of hairy nanoparticles. In: Soft Matter. 2013 ; Vol. 9, No. 38. pp. 9088-9093.
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