A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Prospect 31 Bldg. 4, 119071, Moscow, Russia.
Phys Chem Chem Phys. 2023 Feb 1;25(5):3950-3958. doi: 10.1039/d2cp05144c.
According to the classical nucleation theory, the presence of solid particles in a liquid should facilitate its heterogeneous nucleation upon supercooling. Here, we have analysed the behaviour of aqueous dispersions of detonation diamond nanoparticles (DND) with different signs of the surface charge in supercooled conditions and the frozen state. The behaviours of the diamond nanoparticles with a typical size of 4.5 nm were compared with each other and with deionized water in ice nucleation and ice shear experiments. The presented experimental data and analysis allowed the description of the significant increase in the freezing delay times for positively charged nanoparticles and the sharp decrease for negatively charged ones in comparison to deionized water, based on the peculiarities of the water structure around the nanoparticles and in the vicinity of a superhydrophobic surface. In addition, this approach has allowed the successful explanation of the difference in the practical work of adhesion for deionized water and dispersions of DND with different particle charges.
根据经典成核理论，固体颗粒的存在应该会促进液体在过冷时异相成核。在这里，我们分析了具有不同表面电荷的爆轰金刚石纳米颗粒（DND）在过冷条件和冻结状态下的分散体的行为。具有典型尺寸 4.5nm 的金刚石纳米颗粒的行为彼此之间以及与去离子水在成冰和冰剪切实验中进行了比较。所呈现的实验数据和分析允许根据纳米颗粒周围和超疏水表面附近的水结构的特性，描述带正电荷的纳米颗粒的冷冻延迟时间显著增加，而带负电荷的纳米颗粒的冷冻延迟时间急剧减少，与去离子水相比。此外，这种方法还成功地解释了去离子水和具有不同颗粒电荷的 DND 分散体的实际附着功之间的差异。
