Drying structures of micrometer-sized cationic gel spheres of lightly cross-linked poly(2-vinyl pyridine) in the deionized aqueous suspension

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• 作者：Syuji Fujii ; Koji Kobayashi ; Yoshinobu Nakamura…
• 关键词：Cationic gel spheres ; Poly(2 ; vinyl pyridine) ; Drying pattern ; Dissipative structure ; Dissipative crystallization ; Array of single crystals
• 刊名：Colloid & Polymer Science
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：293
• 期：7
• 页码：1855-1864
• 全文大小：9,098 KB
• 参考文献：1.Okubo T (2006) Drying dissipative structures of colloidal dispersions. In: Stoylov SP, Stoimenova MV (eds) Molecular and colloidal electro-optics. CRC Book, Taylor & Francis, New York, pp 573-89
  2.Okubo T (2008) Convectional, sedimentation and drying dissipative patterns of colloidal dispersions and solutions. In: Nanoparticles: syntheses, stabilization, passivation and functionalization, Nagarajan R, Hatton TA (eds), pp 256-270, ACS Book Washington DC
  3.Okubo T (2010) Dissipative structure in the course of drying suspensions and solutions. Macromol Symp 288:67-7View Article
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  9.Okubo T, Fujii S, Aono K, Nakamura Y (2012) Drying dissipative structures of lightly cross-linked poly(2-vinyl pyridine) cationic gel spheres stabilized with poly(ethylene glycol) in the deionized aqueous suspension. Colloid Polym Sci 290:1019-030
  10.Okubo T, Fujii S, Aono K, Nakamura Y (2013) Drying dissipative structures of lightly cross-linked poly(2-vinyl pyridine) (170 ~ 180?nm in diameter) in the deionized aqueous suspension. Colloid Polym Sci 291:2805-813View Article
  11.Fujii S, Yamashita Y, Nakamura Y, Okubo T (2014) Drying dissipative structures of cationic gel spheres of lightly cross-linked poly(2-vinylpyridine) in deionized aqueous suspension. Colloid Polym Sci 292:2621-631View Article
  12.Okubo T, Fujii S, Aono K, Nakamura Y (2013) Cationic gel crystals of lightly cross-linked poly(2-vinyl pyridine) spheres (170 ~ 180?nm in diameter) in the deionized aqueous suspension. Colloid Polymer Sci 291:2569-577View Article
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• 作者单位：Syuji Fujii (1)
  Koji Kobayashi (1)
  Yoshinobu Nakamura (1)
  Tsuneo Okubo (2)
  
  1. Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1, Ohmiya, Asahi-ku, Osaka, 535-8585, Japan
  2. Institute for Colloidal Organization, Hatoyama 3-1-112, Uji, Kyoto, 611-0012, Japan
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

Drying dissipative patterns of cationic gel crystals of lightly cross-linked poly(2-vinyl pyridine) spheres stabilized with poly(ethylene glycol) (μPEGMA-P2VP (0.1), μPEGMA-P2VP (0.5), and μPEGMA-P2VP (1) (1.12?~-.20?μm in diameter and 0.1, 0.5, and 1 in degrees of cross-linking) were studied on a cover glass, a watch glass and a Petri glass dish. Iridescent colors and hexagonal spots were observed with the naked eyes in the dried film. Two kinds of the broad rings were observed at the outside edge and inner region in the macroscopic drying patterns. The size of the inner rings increased with gel concentration. Formation of the similar sized aggregates (or agglomerates) and their ordered arrays ((a) ordered ring, (b) spoke-lines, (c) net, and (d) lattice structures) have been observed in common for cationic and anionic gel sphere suspensions examined hitherto. However, the ordering of the agglomerates was not observed for μPEGMA-P2VP spheres. Coexistence of the similar-sized face-centered cubic (fcc) and body-centered cubic (bcc) single crystals was observed instead. Interestingly, fcc crystals looked like white clouds and distributed roughly broad ring-like. This morphological effect on the drying patterns of μPEGMA-P2VP cationic gel spheres is considered to be one of the dissipative crystallization phenomena of colloidal gel spheres during drying processes accompanied with the release of the strain during the course of solidification. Importance of the dissipative convectional flow, formation of the electrical double layers around the spheres, and the interaction of the large gel spheres with the substrates was clear during dryness on the drying pattern formation.