Abstract:We investigate the
temperature-dependent phase behavior of mixtures
of poly(N-isopropylacrylamide) (pNIPAM) microgel
colloids and a triblock copolymer (PEO–PPO–PEO) surfactant.
Usually, gelation in these systems results from an increase in temperature. Here we investigate the role of the heating rate,
and surprisingly, we find that this causes the mechanism of aggregation
to change from one which is driven by depletion of the microgels by
the micelles at low temperatures to the association of the two species
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