Colloid and Polymer Science

, Volume 293, Issue 10, pp 2763–2769 | Cite as

Thermo-sensitive colloidal crystals composed of monodisperse colloidal silica- and poly(N-isopropyl acrylamide) gel spheres

  • Daisuke Suzuki
  • Kiyoshi Shibata
  • Akira Tsuchida
  • Tsuneo Okubo
Original Contribution

Abstract

Thermo-sensitive colloidal crystals were prepared simply and conveniently by mixing of colloidal silica spheres with a series of thermo-sensitive gel spheres, poly (N-isopropyl acrylamide) (pNIPAm, 225~1500 nm in hydrodynamic diameter, 0.5~5 mol% in degree of cross-linking and at 20~45 °C) in the deionized aqueous suspension. The thermo-reversible change in the lattice spacing of colloidal crystals of monodispersed silica spheres (CS83, 103 nm in diameter) depends on the size of the admixed pNIPAm. For gel spheres with similar or less than that of the silica spheres, the lattice spacing decreased with rising temperature. On the other hand, the spacing increased with temperature for the mixtures with pNIPAm spheres of larger than the size of the silica spheres. A mechanism, which is able to explain properly the several experiments including the present work, is proposed, i.e., balancing between the weak adsorption and segregation effects of silica with gel spheres.

Keywords

Thermo-sensitive colloidal crystal Thermo-sensitive hydrogel spheres Colloidal silica spheres Poly (N-isopropyl acrylamide) Adsorption Segregation 

Notes

Acknowledgments

D.S. and A.T. from Japan Society for the promotion of Science for Scientific Research (B) are highly appreciated. D.S. also acknowledges Grant-in-Aid for Young Scientists (A) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (22685024).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Daisuke Suzuki
    • 1
    • 2
  • Kiyoshi Shibata
    • 3
  • Akira Tsuchida
    • 3
  • Tsuneo Okubo
    • 4
  1. 1.Division of Smart TextileGraduate School of Textile Science & TechnologyUedaJapan
  2. 2.Institute for Fiber Engineering, Interdisciplinary Cluster for Cutting Edge ResearchShinshu UniversityUedaJapan
  3. 3.Department of Applied ChemistryGifu UniversityGifuJapan
  4. 4.Institute for Colloidal OrganizationUjiJapan

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