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The phase behavior of poly (N-isopropylacrylamide) nanoparticles dispersed inaqueous medium is investigated as a function of temperature using static anddynamic light scattering techniques. The diameter, d of the particles, asdetermined by dynamic light scattering measurements on dilute dispersion showeda decrease in size from 273 nm at 25C to 114 nm at 40C as function oftemperature with a sudden collapse of particle volume (volume phase transition)at 32.4C. Further this nanoparticle dispersion is found to turn turbid beyondvolume phase transition. Static light scattering measurements on samples withintermediate concentration and high concentration showed liquid-like order andcrystalline order respectively. The intensity of the Bragg peak of thecrystallized sample when monitored as a function of temperature showed crystalto liquid transition at 26.2C and a fluid to fluid transition at 31C. Theoccurrence of melting at a volume fraction of 0.85 and the absence of change innumber density across the fluid-to-fluid transition suggest that interparticleinteraction is repulsive soft-sphere below the volume phase transition. Thereported results on the phase behavior of poly(N-isopropylacrylamide) nanogelsuspensions are discussed in the light of the present results.

Phase Behavior of Poly(N-isopropylacrylamide) Nanogel dispersions: Temperature Dependent Particle Size and Interactions