NDLI: Kinetic studies of colloidal crystallization of thermo-sensitive gel spheres of poly(N-isopropylacrylamide)

Content Provider	Springer Nature Link
Author	Okubo, Tsuneo Suzuki, Daisuke Shibata, Kiyoshi Tsuchida, Akira
Copyright Year	2012
Abstract	Crystal growth rate coefficients, k of the colloidal crystallization of thermo-sensitive gel spheres of poly(N-isopropylacrylamide) were measured from the time-resolved reflection spectroscopy mainly by the inverted mixing method in the deionized state. Crystallization of colloidal silica spheres were also measured for comparison. The k values of gel and silica systems increased sharply as the sphere concentration and suspension temperature increased. The k values of gel system were insensitive to the degree of cross-linking in the range from 10 to 2 mol% of cross-linker against amount of the monomer in mole and decreased sharply when the degree of cross-linking decreased further to 0.5 %. The k values increased as gel size increased. The k values of gel systems at 20 °C were small and observed only at the very high sphere concentration in volume fraction, whereas those at 45 °C were high but smaller than those of silica systems. Induction time (t i) after which crystallization starts, increased as the degree of cross-linking increased and/or the gel size decreased at any temperatures, when comparison was made at the same gel concentration. The t i values at 45 °C were high and decreased sharply with increasing sphere concentration, whereas those at 20 °C were high only at the very high sphere concentrations. Significant difference in the k and t i values between the soft gels and hard silica spheres was clarified. These kinetic results support that the electrical double layers play an important role for the gel crystallization in addition to the excluded volume of gel spheres. It is deduced further that the electrical double layers of the gel system form from the vague interfaces (between soft gel and water phases) compared with those of typical colloidal hard sphere system.
Starting Page	1403
Ending Page	1412
Page Count	10
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	290
Issue Number	14
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-05-05
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Poly(N-isopropyl acrylamide) Colloidal crystal Thermo-sensitive gel sphere Crystallization kinetics Colloidal interface Food Science Polymer Sciences Characterization and Evaluation of Materials Physical Chemistry Soft and Granular Matter, Complex Fluids and Microfluidics
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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Colloidal crystallization of thermo-sensitive gel spheres of poly (N-isopropyl acrylamide)

Colloidal crystallization of thermo-sensitive gel spheres of poly (N-isopropyl acrylamide). Influence of gel size

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