Ice Nucleating Behaviour of Aqueous and Alcoholic Solution of Phloroglucinol: A Laboratory Study

Authors

  • S Paul Atmospheric Science Research Group M.Phil Programme in Environmental Science Faculty of Science Jadavpur University
  • A Hazra Atmospheric Science Research Group M.Phil Programme in Environmental Science Faculty of Science Jadavpur University
  • D Roy Atmospheric Science Research Group M.Phil Programme in Environmental Science Faculty of Science Jadavpur University
  • U K De Atmospheric Science Research Group M.Phil Programme in Environmental Science Faculty of Science Jadavpur University
  • S Bahr Dept. of Chemistry Jadavpur University Kolkata, India
  • K Goswami Dept. of Physics Jadavpur University Kolkata, India

Abstract

The behaviour of ice nucleation at different temperatures has been studied in case of seeding with aqueous solution and alcoholic solution of Phloroglucinol. For aqueous solution, the nucleation has been studied starting from –17.90C and it was observed to terminate at -0.50C. In case of alcoholic solution, the study has been started from –22.30C and it was found to continue up to –3.50 C. The higher temperature is a cut-off temperature, but at the lower temperature end the nucleation becomes quite small, though not amounting to zero. However the peak in crystallization occurs at –13.00 C in the case of aqueous solution and the corresponding peak occurs at – 17.80 C in the case of alcoholic solution. Apparently both these temperatures are close to the freezing temperature of the mixture. Besides, dendrite structure is observed in both the cases in the temperature range of –200C to –170C. However, hexagonal crystals have only been observed in case of aqueous solution in the temperature range of -15 0 C to –10 0 C. Cubic crystals exist dominantly in case of alcoholic solution, but rod shape crystals dominate in case of aqueous solution.

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Technical Notes and Correspondence