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Dynamic Arrest of Adhesive Hard Rod Dispersions

Published

Author(s)

Ryan P Murphy, Harold Wickes Hatch, Nathan NMN Mahynski, Vincent K. Shen, Norman J. Wagner

Abstract

Dynamic arrest transitions of model, thermoreversible dispersions of adhesive hard rods are measured as a function of absolute temperature Τ = 15 -40 °C, aspect ration L/D{approximately equal}3-7, and volume fraction φ0.1-0.5. The critical gel temperature Τgel and glass volume fraction φg are quantified based on the particle dynamics and rheology. Scattering measurements of the attraction-driven gel boundaries reveal a convergence in reduced temperature τ for φ<φg, indicating rod gelation occurs at a similar effective attraction independent of L/D. Monte Carlo simulations find an average bond coordination number [n6dc^]{approximately equal}2.4 at the gel point, supporting the link between physical gelation and rigidity percolation of rod-like dispersions.
Citation
Soft Matter
Volume
16
Issue
5

Keywords

Gelation, glass formation, anisotropic particles, scattering
Created February 6, 2020, Updated September 15, 2020