专家著述(1997)：NaCl晶体表面潮解过程的扫描介电力显微镜研究

【中文摘要】 潮解是一个经典的物化现象，由于缺乏直接的显微手段，对潮解的微观动态过程，一直没有细致的了解。利用扫描介电力显微镜（ＳＰＦＭ）技术，可以对盐表面进行非接触式测量，从而能够直接观察盐表面在空气中潮解的过程，在研究ＮａＣｌ晶体的实验中发现，在相对湿度＜３０％情况下，水主要吸附在台阶附近。在中等湿度（～５０％）时，可以观察到台阶明显移动，这种移动随湿度增高而加快。文章对潮解的微观动态机制进行了讨论。 【英文摘要】 Deliquescence is a classical phenomenon in chemical physics.However,the detailed understanding of its dynamic mechanism in a microscopic scale is quite poor due to the lack of direct imaging techniques.By using scanning polarization force microscopy (SPFM),it is possible to observe in situ the deliquescence process of salt in air.In this paper,it′s found that the water likes to be adsorbed near the steps on NaCl crystal surfaces at low humidity (RH<30%).Under the middle humidity (～50%),step movement can ...