Phase behavior and rheology of sticky rod-like particles

Details Phase behavior and rheology of sticky rod-like particles Phase behavior and rheology of sticky rod-like particles

2008-11-05

arxiv.org/abs/0811.0669v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 6 figures

Scientific paper

We construct colloidal ``sticky'' rods from the semi-flexible filamentous fd virus and temperature-sensitive polymers poly(N-isopropylacrylamide) (PNIPAM). The phase diagram of fd-PNIPAM system becomes independent of ionic strength at high salt concentration and low temperature, i.e. the rods are sterically stabilized by the polymer. However, the network of sticky rods undergoes a sol-gel transition as the temperature is raised. The viscoelastic moduli of fd and fd-PNIPAM suspensions are compared as a function of temperature, and the effect of ionic strength on the gelling behavior of fd-PNIPAM solution is measured. For all fluidlike and solidlike samples, the frequency-dependant linear viscoelastic moduli can be scaled onto universal master curves.

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