Temperature-triggered colloidal gelation through well-defined grafted polymeric surfaces

J.M.H. van Doorn, J.H.B. Sprakel, T.E. Kodger

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Sufficiently strong interparticle attractions can lead to aggregation of a colloidal suspension and, at high enough volume fractions, form a mechanically rigid percolating network known as a colloidal gel. We synthesize a model thermo-responsive colloidal system for systematically studying the effect of surface properties, grafting density and chain length, on the particle dynamics within colloidal gels. After inducing an attraction between particles by heating, aggregates undergo thermal fluctuation which we observe and analyze microscopically; the magnitude of the variance in bond angle is larger for lower grafting densities. Macroscopically, a clear increase of the linear mechanical behavior of the gels on both the grafting density and chain length arises, as measured by rheology, which is inversely proportional to the magnitude of local bond angle fluctuations. This colloidal system will allow for further elucidation of the microscopic origins to the complex macroscopic mechanical behavior of colloidal gels including bending modes within the network. View Full-Text
Original languageEnglish
Article number21
JournalGels
Volume3
Issue number2
DOIs
Publication statusPublished - 30 Apr 2017

Fingerprint Dive into the research topics of 'Temperature-triggered colloidal gelation through well-defined grafted polymeric surfaces'. Together they form a unique fingerprint.

  • Cite this