玻璃状稀海藻糖水溶液结晶冰的转化过程,Physical Chemistry Chemical Physics

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玻璃状稀海藻糖水溶液结晶冰的转化过程
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2022-10-12 , DOI: 10.1039/d2cp02712g
Yoshiharu Suzuki ₁ , Satoshi Takeya ₂

Affiliation

亚稳态冰及其晶体生长在气象学、低温生物学和行星科学中起着重要作用。然而，由于偏析，很难研究溶质对稀水溶液中冰晶体生长的影响。在此，我们制作了一种非分离的稀海藻糖水溶液（0.023 摩尔分数）玻璃，并使用粉末 X 射线衍射测量方法检查了随着温度升高水溶液中结晶冰的转变。结晶后立即形成的冰是纳米级堆积无序冰（ice Isd），堆垛层错少，立方体度高。冰Isd在海藻糖水溶液中的晶体生长明显慢于冰Isd在甘油水溶液和纯冰Isd中的晶体生长。冰 Isd 存活至 ~230 K，高于从冰 Isd 到纯水六方冰（冰 Ih）的转变温度（~200 K）。海藻糖的存在抑制了冰的晶体生长，因此冰在真空条件下容易升华。此外，在 ~245 K 时宏观偏析的发生与 Isd 到 Ih 的转变有关。这些结果对于改进低温保存的生物组织的解冻技术以及了解地球大气中冰云形成的机制具有重要意义。~245 K 时宏观偏析的发生与 Isd 到 Ih 的转变有关。这些结果对于改进低温保存的生物组织的解冻技术以及了解地球大气中冰云形成的机制具有重要意义。~245 K 时宏观偏析的发生与 Isd 到 Ih 的转变有关。这些结果对于改进低温保存的生物组织的解冻技术以及了解地球大气中冰云形成的机制具有重要意义。

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Transformation process of ice crystallized from a glassy dilute trehalose aqueous solution

Metastable forms of ice and their crystal growth play an important role in meteorology, cryobiology, and planetary science. However, it is difficult to investigate the effects of solute on the crystal growth of ice in a dilute aqueous solution due to the segregation. Herein, we made a non-segregated glass of dilute trehalose aqueous solution (0.023 mole fraction) and examined the transformation of crystalline ice in the aqueous solution with increasing temperature using powder X-ray diffraction measurements. The ice formed immediately after the crystallization is nano-sized stacking disordered ice (ice Isd) with few stacking faults and has high cubicity. The crystal growth of ice Isd in the trehalose aqueous solution was remarkably slower than those of ice Isd in a glycerol aqueous solution and pure ice Isd. The ice Isd survived up to ∼230 K which is higher than the transformation temperature from ice Isd to hexagonal ice (ice Ih) of pure water (∼200 K). The existence of trehalose inhibits the crystal growth of ice Isd and, as a result, the ice sublimates easily under vacuum conditions. Moreover, the occurrence of macroscopic segregation at ∼245 K is related to the Isd-to-Ih transformation. These results are important for the improvement of thawing techniques for cryopreserved biological tissues and for the understanding of the mechanism of ice cloud formation in the Earth's atmosphere.

更新日期：2022-10-12

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