TY - JOUR
T1 - Preparation of polydiacetylene microcrystals and their properties
AU - Kasai, Hitoshi
AU - Katagi, Hideyuki
AU - Iida, Rieko
AU - Okada, Shuji
AU - Oikawa, Hidetoshi
AU - Matsuda, Hiro
AU - Nakanishi, Hachiro
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1997
Y1 - 1997
N2 - Microcrystals of solid-state polymerizable diacetylene compounds have been successfully prepared by a reprecipitation from their acetone solution in water, and were converted into polydiacetylene microcrystals dispersed in water. Effect of size-determining factors such as concentration of solution and temperature of water were investigated. Based on the results, microcrystal formation mechanism, i.e. first reprecipitation of amorphous microparticles, followed by the competing processes of crystallization in particle and adhesion of particles, was suggested. Some characteristic features of the microcrystals, compared with those of large bulk crystals, have been revealed: for example, excitonic absorption of polydiacetylenes took place a blue shift with decreasing size, in almost one order of magnitude larger size range than those of metals and semiconductors. It has also been demonstrated that polydiacetylene microcrystal dispersion gives good enough optical quality to conduct optical Kerr-shutter experiment, and the large X(3) value of ca. 10-9 esuM-1 at a nonresonant wavelength was clarified.
AB - Microcrystals of solid-state polymerizable diacetylene compounds have been successfully prepared by a reprecipitation from their acetone solution in water, and were converted into polydiacetylene microcrystals dispersed in water. Effect of size-determining factors such as concentration of solution and temperature of water were investigated. Based on the results, microcrystal formation mechanism, i.e. first reprecipitation of amorphous microparticles, followed by the competing processes of crystallization in particle and adhesion of particles, was suggested. Some characteristic features of the microcrystals, compared with those of large bulk crystals, have been revealed: for example, excitonic absorption of polydiacetylenes took place a blue shift with decreasing size, in almost one order of magnitude larger size range than those of metals and semiconductors. It has also been demonstrated that polydiacetylene microcrystal dispersion gives good enough optical quality to conduct optical Kerr-shutter experiment, and the large X(3) value of ca. 10-9 esuM-1 at a nonresonant wavelength was clarified.
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U2 - 10.1246/nikkashi.1997.309
DO - 10.1246/nikkashi.1997.309
M3 - Article
AN - SCOPUS:5344236068
SP - 309
EP - 317
JO - [No source information available]
JF - [No source information available]
IS - 5
ER -