流动电位法对降温结晶过程的研究

对过饱和溶液在施加一定的流体压力差使之循环流动,实验结果测算草酸、草酸钠、硼酸和磷酸氢二钠等在不同温度下饱和溶液降温结晶时流动电位随时间的变化规律.实验结果表明流动电位大小与结晶物质的种类、温度和浓度有关,同时易受外界因素的干扰,实验数据的严格重现较难.但多次实验结果都显示:过饱和溶液在某一温度下形成晶核过程中其流动电位均发生显著变化;当饱和溶液起始结晶温度较高时,其流动电位突变点温度也更高.

Descent Temperature Process of Crystallization Studied by the Streaming Potential

A definite hydrodynamic pressure was forced to the supersaturated solution circulation. Universal meters and pressure gauges were utilized to determine the influence of different temperature on streaming potential in H_2C_2O_4, Na_2C_2O_4, H_3BO_3 and Na_2HPO_4 saturated solution. It shows that the sizes of streaming potential relate to electrolyte kinds, temperature and concentration of the crystallized matter. The exact recurrence of the experimental data influenced by external factors is difficult. But lots of experimental results indicated that all streaming potential data change markedly in the course of forming crystal nucleus in supersaturated solution under certain temperature. The higher the original crystallization temperature of saturated solution is,the higher streaming potential mutation is. A kind of method which controls crystal growth may be provided by using the streaming potential.