诱导期法对溶液初级成核的研究

Study on Solution Primary Nucleation by Induction Period

建立了一套用激光法测定溶液初级成核诱导期的实验装置,将诱导期与经典的初级成核理论相结合,对涉及溶液初级成核的多种性质进行了定量研究,包括初级成核自由能、临界晶核的尺寸和分子数、固液界面张力、接触角等.实验结果表明,这是一个研究溶液初级成核的很好方法.对于实际情况下过饱和度比S=5～10,得到的临界晶核的分子数Nc=15～5,与有关的文献报道相一致.

A set of experimental apparatus was es ta blished to study the induction period of solution primary nucleation by laser me thod. The induction period was combined with the classical theory of nucleation, through which many important properties involved in the solution primary nuclea tion could be quantitatively studied, including critical nucleation free energy, size and molecular number of critical nucleus, interfacial tension between soli d and liquid, the contact angle between nucleus and the foreign solid surface.Th e experiment indicated that this is a very good method to study solution primary nucleation.In practice,when supersaturation S=5～10,the molecul a r number of critical nucleus Nc=15～5 obtained by this method is consistent with that reported by relevant references.