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Crystallization kinetics of thermosensitive colloids probed by transmission spectroscopy.

The kinetics of crystallization of poly-N-isopropylacrylamide (PNIPAM) particles has been investigated using the UV-visible transmission spectroscopy. Since the particle size decreases with the increase in temperature, microgel dispersions of different volume fractions have been obtained by varying the temperature of a single sample. It is found that the rates of the change in crystallinity, the average crystallite size, and the number density of crystallites at the most rapid stage over a certain time interval at various temperatures can be described by the power-law relations. At 19 degrees C, the PNIPAM system behaves as a hard sphere system under microgravity. The hard sphere theory based on Monte Carlo simulation has been used as a reference point to compare with conventional hard spheres, soft spheres, and PNIPAM spheres.[1]

References

  1. Crystallization kinetics of thermosensitive colloids probed by transmission spectroscopy. Tang, S., Hu, Z., Cheng, Z., Wu, J. Langmuir : the ACS journal of surfaces and colloids. (2004) [Pubmed]
 
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