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Mechanism of lamellar spacing adjustment in directionally frozen agar gels

  • Colloid Science
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Abstract

A theory is presented for predicting the size of ice crystals which result from steady-state, unidirectional growth within aqueous agar gels. Cellular arrays of adjacent ice crystals were separated by an amorphous water-agar membrane at a composition near the vitrification point. Using this vitrification composition and both a steady-state condition and a minimum free energy criterion, the size of ice crystals was predicted for a given solidification velocity and diffusion condition. It was found, however, that this simple model could not predict the trend towards larger crystal sizes that was observed when the initial agar concentration in the gels increased from 3% to 10% by weight agar.

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Author notes

  1. H. M. Tong

    Present address: IBM Thomas J. Watson Research Center, Yorktown Heights, New York

  2. C. C. Gryte

    Present address: Department of Chemical Engineering and Applied Chemistry, Columbia University, New York, New York

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    1. H. M. Tong
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    2. C. C. Gryte
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    Tong, H.M., Gryte, C.C. Mechanism of lamellar spacing adjustment in directionally frozen agar gels. Colloid & Polymer Sci 263, 147–155 (1985). https://doi.org/10.1007/BF01412789

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    • DOI: https://doi.org/10.1007/BF01412789

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