Hydration/Dehydration Processes from the Viewpoints of Effects of Pressure on Solubilities and Growth Rates of Crystals(<Special Issue>Topics of Crystal Growth Related to Water)

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  • 溶解度・結晶成長速度の圧力依存性から見る水和・脱水和プロセス(<特集>水が関係する結晶成長のトピックス)
  • 溶解度・結晶成長速度の圧力依存性から見る水和・脱水和プロセス
  • ヨウカイド ・ ケッショウ セイチョウ ソクド ノ アツリョク イソンセイ カラ ミル スイワ ・ ダツスイワ プロセス

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Precise understandings of hydration and dehydration processes in crystallization processes are prerequisites for deeper insights into fundamentals of crystal growth in aqueous solutions. In this review, we present the great potentialities of thermodynamic and kinetic analyses of the dependence of solubilities and crystal-growth-rates on pressure on experimentally accessible information of hydration and dehydration processes in crystallization processes. The dependence of solubility of crystals on pressure provides molar volume change of dissolution. Positive and negative slopes of solubility curves with pressure result in the decrease and increase in the molar volume of solutes during dissolution processes, respectively. Activation volumes during solute incorporation processes at kink sites are calculated using the dependence of step kinetic constant on pressure. In practice, solubilities of alkali halide, amino acid, and protein crystals, and step velocity of glucose isomerase crystals are discussed.

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