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Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels
Published on: September 8, 2016
The size of particle aggregates produced by flocculation with PNIPAM, as a function of temperature
Elizaveta Burdukova1, Naoyuki Ishida, Timothy Shaddick
1Australian Mineral Science Research Institute, Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia. forbese@unimelb.edu.au
Abstract:
This work investigates the effect of temperature on the size of alumina aggregates formed by flocculation with temperature responsive Poly(N-Isopropylacrylamide)(PNIPAM). The results are discussed in terms of the effects of temperature on particle collision, particle adhesion and aggregate breakage. It was found that the size of alumina aggregates increases with increasing solution temperature. Particle/particle collision and aggregate breakage are largely unaffected by increasing solution temperature and therefore could not account for the change in aggregate size. The dominant factor in aggregate growth with increasing temperature was found to be the increase in the force of adhesion between alumina particles. The appearance of the adhesive force is triggered by the increase in temperature above the lower critical solution temperature of PNIPAM.
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