Melting Kinetics of Thermally Responsive Microgel Crystals
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The melting kinetics of three-dimensional colloidal crystals consisting of poly(N-isopropylacrylamide) microgels was investigated by using UV - visible transmission spectroscopy. It was found that the melting was initiated with a decrease of the interplanar spacing of the crystals and that crystallites broke into smaller pieces at large overheating temperatures. The crystallites reach a minimum burst size before completely broken apart. The complete melting occurs as the average thermal fluctuation of the particles reach around 19%. The experimental results corroborate with recent computer simulations that conciliate the Lindemann criterion of melting with Born's mechanical instability. © 2007 American Chemical Society.
author list (cited authors)
Tang, S., Hu, Z., Zhou, B. o., Cheng, Z., Wu, J., & Marquez, M.