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Viscosity and Spinnability of Gelling Solutions

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Handbook of Sol-Gel Science and Technology

Abstract

Gelling solutions of a certain composition range in the alkoxysilane-water-alcohol systems catalyzed with an acid are spinnable at the viscosity of 10 ~ 100 poise and subject to fiber drawing. In order to understand such behavior of sol–gel solutions, rheological properties of solutions, especially, the viscosity change with time and shear rate, and methods of measurement of viscosity of solutions were reviewed. Measurements of viscosity applied to tetraethoxysilane solutions indicated that both spinnable and nonspinnable solutions increase in viscosity with time in a similar manner and that spinnable solutions are Newtonian in flow behavior in the viscosity range of 10 ~ 100 poise where fibers can be drawn, while nonspinnable solutions are characterized by non-Newtonian, thixotropic flow behavior. On the basis of the abovementioned results of viscosity measurements, together with the analysis of flow behavior and mechanism of hydrolysis-condensation of tetraethoxysilanes, the occurrence of spinnability was related to the linear shape of particles in the solution. Further, the same discussion was found to be valid for solutions designed for drawing of Al2O3, TiO2, ZrO2, and Y-Ba-Cu-O superconducting fibers.

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Authors and Affiliations

  1. Sakka Laboratory, Kuzuha-Asahi, 2-7-30, Hirakata, 573-1111, Osaka-fu, Japan

    Sumio Sakka

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  1. Sumio Sakka
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Correspondence to Sumio Sakka .

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Editors and Affiliations

  1. Rutgers University, Piscataway, New Jersey, USA

    Lisa Klein

  2. Madrid, Spain

    Mario Aparicio

  3. City University of New York, New York, USA

    Andrei Jitianu

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Sakka, S. (2016). Viscosity and Spinnability of Gelling Solutions. In: Klein, L., Aparicio, M., Jitianu, A. (eds) Handbook of Sol-Gel Science and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-19454-7_41-1

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  • DOI: https://doi.org/10.1007/978-3-319-19454-7_41-1

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  • Publisher Name: Springer, Cham

  • Online ISBN: 978-3-319-19454-7

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