Song Xiaoyuan, Zhong Lisheng, Gao Jinghui
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
Materials (Basel). 2021 Nov 18;14(22):6975. doi: 10.3390/ma14226975.
In this paper, the inhibition effect of an alternative current (AC) electric field on ice crystallization in 0.9 wt % NaCl aqueous solution was confirmed thermodynamically with characterization. An innovative experimental and analytical method, combining differential scanning calorimeter (DSC) measurement with an externally applied electric field was created by implanting microelectrodes in a sample crucible. It was found that the ice crystallization, including pure ice and salty ice, was obviously inhibited after field cooling with an external AC electric field in a frequency range of 100 k-10 MHz, and the crystallization ratio was related to frequency. Compared with non-field cooling, the crystallization ratio of ice crystals was reduced to less than 20% when = 57.8 kV/m and = 1 MHz. The dielectric spectrum results show that this inhibition effect of an alternating electric field on ice crystal growth is closely related to the dielectric relaxation process of hydrated ions.
本文通过表征从热力学角度证实了交流（AC）电场对0.9 wt% NaCl水溶液中冰结晶的抑制作用。通过在样品坩埚中植入微电极，创建了一种将差示扫描量热仪（DSC）测量与外部施加电场相结合的创新实验和分析方法。研究发现，在100 k - 10 MHz频率范围内施加外部交流电场进行场冷后，包括纯冰和盐冰在内的冰结晶明显受到抑制，且结晶率与频率有关。与非场冷相比，当电场强度E = 57.8 kV/m且频率f = 1 MHz时，冰晶的结晶率降低至20%以下。介电谱结果表明，交变电场对冰晶生长的这种抑制作用与水合离子的介电弛豫过程密切相关。
