Various types of polydiacetylene microcrystals fabricated by reprecipitation technique and some applications

The reprecipitation method is a useful technique to fabricate organic microcrystals such as polydiacetylene (PDA), low‐molecular‐weight aromatic compounds, organic functional dyes, which features are located in a mesoscopic phase between a single molecule and bulk crystals, and organic microcrystals...

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Published inPolymers for advanced technologies Vol. 11; no. 8-12; pp. 783 - 790
Main Authors Oikawa, Hidetoshi, Oshikiri, Toshiyuki, Kasai, Hitoshi, Okada, Shuji, Tripathy, Sukant K., Nakanishi, Hachiro
Format Journal Article
LanguageEnglish
Published Chichester, UK John Wiley & Sons, Ltd 01.08.2000
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Summary:The reprecipitation method is a useful technique to fabricate organic microcrystals such as polydiacetylene (PDA), low‐molecular‐weight aromatic compounds, organic functional dyes, which features are located in a mesoscopic phase between a single molecule and bulk crystals, and organic microcrystals are expected to exhibit peculiar optical and electronic properties. In the present article, the effects of added surfactants and temperature were investigated to develop and establish further the reprecipitation method to control crystal size, shape of PDA microcrystals. Especially, we were much interested in reprecipitation conditions and formation mechanism to form fibrous PDA microcrystals. In addition, as some trial applications, it has been successful to trap an isolated PDA microcrystal and to prepare well‐defined PDA microcrystal thin film, using a layer‐by‐layer procedure. This technique utilized an electrostatic adsorption between microcrystals with highly negative ζ‐potential in an aqueous dispersion liquid and polyelectrolyte (polycation) film. As a result, the value of χ(3)(ω) for the resulting layered PDA microcrystal thin film was confirmed to be enhanced by a factor of about 100, owing to concentration effect. Copyright © 2000 John Wiley & Sons, Ltd.
Bibliography:ark:/67375/WNG-CX49QT9L-J
istex:3EF8E160D2D6D8A4323596233BBB73685BF7861E
ArticleID:PAT28
ISSN:1042-7147
1099-1581
DOI:10.1002/1099-1581(200008/12)11:8/12<783::AID-PAT28>3.0.CO;2-L