NaCl晶体表面潮解过程的扫描介电力显微镜研究  

SPFM Study of Deliquescence Process of NaCl Crystal Surface

作　　者：孙洁林[1] 胡钧[1] 徐磊[1] 陈圣福[1] 张益[1] 欧阳振乾[1] 胡志强[1] 张桂根[1] 徐耀良[1] 於新根 李民乾[1] 

机构地区：[1]中国科学院上海原子核所核分析开放实验室

出　　处：《电子显微学报》1997年第6期742-743,共2页Journal of Chinese Electron Microscopy Society

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。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 be clearly observed and it becomes faster at higher humidity.The dynamic mechanism of salt deliquescence has been discussed.

关 键 词：晶体 SPFM 潮解过程 氯化钠 

分 类 号：O614.112[理学—无机化学]