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CHANGES IN ELECTRICAL RESISTANCE DURING FREEZING AND THEIR APPLICATION TO THE CONTROL OF THE FREEZE-DRYING PROCESS.

Author(s) : MACKENZIE A. P.

Summary

EUTECTIC CRYSTALLIZATION OFTEN CAUSED A SUDDEN RISE IN RESISTANCE OF SEVERAL LOG10 OHMS AND WAS THUS RATHER READILY DISTINGUISHED WHERE THE SOLUTE WAS IONIZED IN SOLUTION. SECOND ORDER PHASE CHANGES GAVE RISE TO CUSPS IN THE RESISTANCE/TEMPERATURE RECORDINGS AND IT WAS OFTEN POSSIBLE TO CORRELATE THE CUSPS WITH SECOND ORDER PHASE TRANSITIONS SEEN BY DIFFERENTIAL THERMAL ANALYSIS. AQUEOUS SOLUTIONS SOMETIMES DEMONSTRATED EUTECTIC CRYSTALLIZATION DRNRN. ELECTRICAL RESISTANCES WERE SEEN GENERALLY TO FALL AND THEN TO RISE WITH CONTINUED WARMING AS A CONSEQUENCE OF THE CRYSTALLIZATION OF AN ELECTRICALLY CONDUCTING SOLUTE OR AN INCREASED VISCOSITY. SYSTEMS EXHIBITING THESE SORTS OF BEHAVIOR WERE CAPABLE OF DEMONSTRATING THE SAME ELECTRICAL RESISTANCE AT THREE CLEARLY DISTINGUISHED TEMPERATURES.

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Details

  • Original title: CHANGES IN ELECTRICAL RESISTANCE DURING FREEZING AND THEIR APPLICATION TO THE CONTROL OF THE FREEZE-DRYING PROCESS.
  • Record ID : 1987-0776
  • Languages: English
  • Source: Fundamentals and Applications of Freeze-Drying to Biological Materials, Drugs and Foodstuffs.
  • Publication date: 1985/05/20
  • Document available for consultation in the library of the IIR headquarters only.

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