Local structure of percolating gels at very low volume fractions

Samuel Griffiths, Francesco Turci, C. Patrick Royall

Research output: Contribution to journalArticle (Academic Journal)peer-review

12 Citations (Scopus)
410 Downloads (Pure)

Abstract

The formation of colloidal gels is strongly dependent on the volume fraction of the system and the strength of the interactions between the colloids. Here we explore very dilute solutions by the means of numerical simulations, and show that, in the absence of hydrodynamic interactions and for sufficiently strong interactions, percolating colloidal gels can be realised at very low values of the volume fraction. Characterising the structure of the network of the arrested material we find that, when reducing the volume fraction, the gels are dominated by low-energy local structures, analogous to the isolated clusters of the interaction potential. Changing the strength of the interaction allows us to tune the compactness of the gel as characterised by the fractal dimension, with low interaction strength favouring more chain-like structures.
Original languageEnglish
Article number014905
Number of pages8
JournalJournal of Chemical Physics
Volume146
DOIs
Publication statusPublished - 6 Jan 2017

Keywords

  • gels
  • local structure

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