Ceramic Synthesis and Functionalization Lab, UMR3080 CNRS/Saint-Gobain, 84306 Cavaillon, France.
Laboratoire de Chimie de la Matière Condensée de Paris, Université Pierre et Marie Curie, Sorbonne Universités, UMR7574, 4 Place Jussieu, 75005 Paris, France.
J Chem Phys. 2017 Apr 14;146(14):144504. doi: 10.1063/1.4979845.
Few compounds feature ice-shaping properties. Zirconium acetate is one of the very few inorganic compounds reported so far to have ice-shaping properties similar to that of ice-shaping proteins, encountered in many organisms living at low temperature. When a zirconium acetate solution is frozen, oriented and perfectly hexagonal ice crystals can be formed and their growth follows the temperature gradient. To shed light on the water/ice phase transition while freezing zirconium acetate solution, we carried out differential scanning calorimetry measurements. From our results, we estimate how many water molecules do not freeze because of their interaction with Zr cations. We estimate the colligative properties of the Zr acetate on the apparent critical temperature. We further show that the phase transition is unaffected by the nature of the base which is used to adjust the pH. Our results provide thus new hints on the ice-shaping mechanism of zirconium acetate.
很少有化合物具有冰成型特性。醋酸锆是迄今为止报道的少数具有类似冰成型蛋白的无机化合物之一，冰成型蛋白存在于许多生活在低温下的生物体中。当醋酸锆溶液被冷冻时，可以形成取向和完美六边形的冰晶，并且它们的生长遵循温度梯度。为了阐明冷冻醋酸锆溶液时的水/冰相转变，我们进行了差示扫描量热法测量。根据我们的结果，我们估计了由于与 Zr 阳离子相互作用而不冻结的水分子数量。我们估计了Zr 醋酸盐在表观临界温度下的依数性质。我们进一步表明，相转变不受用于调节 pH 值的碱的性质的影响。因此，我们的结果为醋酸锆的冰成型机制提供了新的线索。
