Curland Sofia, Allolio Christoph, Javitt Leah, Dishon Ben-Ami Shiri, Weissbuch Isabelle, Ehre David, Harries Daniel, Lahav Meir, Lubomirsky Igor
Department of Materials and Interfaces, The Weizmann Institute of Science, 76100-, Rehovot, Israel.
Institute of Chemistry and the Fritz Haber Research Centre, The Hebrew University, 91904, Jerusalem, Israel.
Angew Chem Int Ed Engl. 2020 Sep 1;59(36):15575-15579. doi: 10.1002/anie.202006435. Epub 2020 Aug 11.
Electrofreezing experiments of super-cooled water (SCW) with different ions, performed directly on the charged hemihedral faces of pyroelectric LiTaO and AgI crystals, in the presence and in the absence of pyroelectric charge are reported. It is demonstrated that bicarbonate (HCO ) ions elevate the icing temperature near the positively charged faces. In contrast, the hydronium (H O ) slightly reduces the icing temperature. Molecular dynamics simulations suggest that the hydrated trigonal planar HCO ions self-assemble with water molecules near the surface of the AgI crystal as clusters of slightly different configuration from those of the ice-like hexagons. These clusters, however, have a tendency to serve as embryonic nuclei for ice crystallization. Consequently, we predicted and experimentally confirmed that the trigonal planar ions of NO and guanidinium (Gdm ), at appropriate concentrations, elevate the icing temperature near the positive and negative charged surfaces, respectively. On the other hand, the Cl and SO ions of different configurations reduce the icing temperature.
报道了在热释电LiTaO和AgI晶体的带电半晶面上，在有和没有热释电电荷的情况下，对含有不同离子的过冷水（SCW）进行的电冷冻实验。结果表明，碳酸氢根（HCO ）离子提高了带正电表面附近的结冰温度。相比之下，水合氢离子（H O ）略微降低了结冰温度。分子动力学模拟表明，水合三角平面HCO 离子在AgI晶体表面附近与水分子自组装成构型与冰状六边形略有不同的簇。然而，这些簇有作为冰结晶胚胎核的趋势。因此，我们预测并通过实验证实，硝酸根（NO ）和胍鎓（Gdm ）的三角平面离子在适当浓度下分别提高带正电和带负电表面附近的结冰温度。另一方面，不同构型的氯离子（Cl ）和硫酸根离子（SO ）降低了结冰温度。
