Wood液态合金在NaOH溶液中的电化学反应及表面张力变化行为

发布时间：2018-05-28 16:27

本文选题：氧化 + 还原　；参考：《化工学报》2017年03期

【摘要】：通过改变液体金属在NaOH溶液中所处的环境介质,利用石墨电极对其施加电场,研究了液态金属的表面张力、界面电化学反应、氧化膜的产生、溶液中电润湿等动态过程。实验发现Wood合金液滴在阳极发生电化学反应产生的氧化膜会迅速减小表面张力并发生铺展,在阴极发生还原反应会使带氧化膜的金属在3 s内恢复到原状,电毛细作用力使氧化膜破裂,各氧化物与NaOH反应产生Sn(OH)_6~(2-)、SnO_3~(2-)、SnO_2~(2-)、PbO_3~(2-)、Cd(OH)_4~(2-)使溶液的颜色发生改变,溶液中生成Bi2O3-Bi(OH)3白色共聚物。薄膜电介质层润湿和溶液中电润湿机理在本质上相同,表面张力随着电压的增大而减小并发生明显的电润湿铺展过程,但由于金属液滴通过电化学反应所能吸附的OH-数量有限,润湿角存在饱和性。
[Abstract]:By changing the environmental medium of liquid metal in NaOH solution and applying electric field to liquid metal, the dynamic processes of surface tension, interfacial electrochemical reaction, the formation of oxide film and electrical wetting in solution were studied. It was found that the oxide film produced by electrochemical reaction of Wood alloy droplets at the anode could rapidly reduce the surface tension and spread out, and the metal with oxide film would return to its original state within 3 seconds after the reduction reaction at the cathode. The electric capillary force causes the oxide film to rupture, and the reaction between the oxides and the NaOH produces SnOHJ / Sno _ 3 / T _ 2 / S _ 2O _ 3 / T _ 2 / S _ 2O _ 2 / T _ 2 / P _ bO _ 3 / T _ 2). The color of the solution is changed and the white copolymers of Bi2O3-Bi(OH)3 are formed in the solution by the reaction of the oxide film with the electro capillary force, and the formation of a white copolymers of Bi2O3-Bi(OH)3 in the solution. The mechanism of film dielectric layer wetting is essentially the same as that of electric wetting in solution. The surface tension decreases with the increase of voltage and an obvious electrical wetting spreading process occurs. However, the number of OH- adsorbed by metal droplets through electrochemical reaction is limited. The wetting angle is saturated.
【作者单位】：兰州理工大学材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室;
【基金】：国家自然科学基金项目(51665031) 甘肃省杰出青年基金项目(1506RJDA087)~~
【分类号】：TG111.4

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