Drying dissipative structures of lightly cross-linked poly(2-vinyl pyridine) cationic gel spheres stabilized with poly(ethylene glycol) in the deionized aqueous suspension

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• 作者：Tsuneo Okubo (1)
  Syuji Fujii (2)
  Kodai Aono (2)
  Yoshinobu Nakamura (2)
  
• 关键词：Cationic gel spheres ; Poly(2 ; vinyl pyridine) ; Drying pattern ; Dissipative structure ; Ordered array ; Agglomeration ; Convectional pattern
• 刊名：Colloid & Polymer Science
• 出版年：2013
• 出版时间：April 2013
• 年：2013
• 卷：291
• 期：4
• 页码：1019-1030
• 全文大小：1181KB
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• 作者单位：Tsuneo Okubo (1)
  Syuji Fujii (2)
  Kodai Aono (2)
  Yoshinobu Nakamura (2)
  
  1. Institute for Colloidal Organization, Hatoyama 3-1-112, Uji, Kyoto, 611-0012, Japan
  2. Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1, Ohmiya, Asahi-ku, Osaka, 535-8585, Japan
  
• ISSN：1435-1536

文摘

Drying dissipative patterns of deionized and colloidal crystal-state suspensions of the cationic gel spheres of lightly cross-linked poly(2-vinyl pyridine) stabilized with poly(ethylene glycol) were observed on a cover glass, a watch glass, and a Petri glass dish. Convectional patterns were recognized with the naked eyes. The broad rings were observed in the drying pattern and their size and width decreased as gel concentration decreased. Formation of the monodispersed agglomerated particles and their ordered arrays were observed. This work clarified the formation of the drying microscopic structures of (a) ordered rings, (b) flickering ordered spoke-lines, (c) net structure, and (d) lattice-like ordered structures of the agglomerated particles. The ordering of the agglomerated particles of the cationic gel spheres is similar to that of the anionic thermo-sensitive gel spheres of poly(N-isopropyl acrylamide). The role of the electrical double layers around the agglomerated particles and the interaction of the particles with the substrates during dryness are important for the ordering. The microscopic drying patterns of gel spheres were different from those of linear-type polymers and also from typical colloidal hard spheres, though the macroscopic patterns such as broad ring formation at the edges were similar to each other. The addition of sodium chloride shifted the microscopic patterns from lattice to net structures.