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研究了不同pH值下、不同温度和过饱和度的KDP溶液的成核过程,测定了不同情况下溶液的诱导期。研究表明,当KDP溶液的过饱和比S>1.3时,均匀成核起主导作用;当S<1.2时,非均匀成核起主导作用。根据经典均匀成核理论,针对KDP过饱和溶液均匀成核的情况计算出了不同pH值、不同温度下的固-液界面张力等成核参数,并从上述参数的相互比较中分析得到了改变pH值后溶液稳定性变强的原因。最后通过对表面熵因子的计算,确定了KDP晶体的微观生长机制为连续生长模式。
The nucleation process of KDP solution with different temperature and supersaturation under different pH values was studied and the induction period of the solution under different conditions was determined. The results show that homogeneous nucleation plays a leading role when the supersaturation ratio of KDP solution is higher than 1.3. When S <1.2, non-uniform nucleation plays a leading role. According to the classical theory of uniform nucleation, the nucleation parameters such as solid-liquid interfacial tension at different pH values and different temperatures were calculated for the homogeneous nucleation of supersaturated KDP solutions. The nucleation parameters were also analyzed from the comparison of the above parameters The reason why the solution becomes more stable after the pH value. Finally, through the calculation of surface entropy factor, it is confirmed that the microscopic growth mechanism of KDP crystal is continuous growth mode.