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Non-equilibrium antifreeze activity of poly(vinyl alcohol) for size control of ice crystals in ice slurries.

Author(s) : INADA T., MODAK P. R., LU S. S.

Summary

Biological non-equilibrium antifreezes, such as antifreeze proteins (AFPs) and antifreeze glycoproteins (AFGPs), have been discovered in several organisms living in cold regions. These non-equilibrium antifreezes are completely different from common antifreezes; AFPs and AFGPs can stop crystal growth of ice in a solution at temperatures even below the melting temperature of ice. The difference between the melting temperature and the freezing temperature at which ice crystals start to grow is called thermal hysteresis. Although AFPs and AFGPs are recognized as effective additives for ice slurries to achieve flow in pipes without clogging, they are relatively expensive and easily denatured. Poly(vinyl alcohol) (PVA) is a possible substitute for AFPs and AFGPs. In this study, evidence of the thermal hysteresis of PVA was obtained by observing growth of single crystals of ice in PVA solutions. Results revealed that PVA is the only known non-peptide polymer that exhibits thermal hysteresis, and that PVA is effective in controlling the size of ice crystals in ice slurries.

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Details

  • Original title: Non-equilibrium antifreeze activity of poly(vinyl alcohol) for size control of ice crystals in ice slurries.
  • Record ID : 2006-2930
  • Languages: English
  • Source: Proceedings of the sixth Workshop on Ice Slurries of the IIR/Proceedings of the Second Conference on Phase Change Material and Slurry (PCM 2005).
  • Publication date: 2005/06/15

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