MRT letter: Real time and in situ imaging the reversible evolution of ethanol vapor condensed on mica surface
MRT letter: Real time and in situ imaging the reversible evolution of ethanol vapor condensed on mica surface
复制标题
DOI：
10.1002/jemt.21022
复制
发表时间：
2011-06
影响因子：
2.5
通讯作者：
Donghua Zhang;Chen Zhang;Fuchun Zhang;Jun Hu
中科院分区：
文献类型：
--
作者：
Donghua Zhang;Chen Zhang;Fuchun Zhang;Jun Hu
利用振动扫描偏振力显微镜（VSPFM）研究了乙醇蒸气在云母表面的可逆吸附和脱附过程。在20°C的温度和20%的相对湿度下，乙醇蒸气冷凝并在新裂开的云母上形成簇。这些团簇扩展成网络结构，随后形成连续VSPFM成像显示的完整膜。在不饱和条件下，膜破裂成碎片并完全脱附。在VSPFM研究中，当偏压不同时，薄膜的表观高度不同，表明乙醇分子在云母表面的极化取向。在云母表面形成团簇或网状结构需要数小时的时间，说明气相乙醇分子不像液相乙醇分子那样容易在云母表面沉淀。显微镜Res. Tech. 2011.© 2011 Wiley利斯公司
The reversible adsorption and desorption of ethanol vapor on mica surface at ambient temperature were investigated in situ with time‐evolution by Vibrating Scanning Polarization Force Microscopy (VSPFM). At temperature 20°C and relative humidity 20%, ethanol vapor condensed and formed clusters on the freshly cleaved mica. These clusters expanded to a network structure and later formed a full film shown by continuous VSPFM imaging. The film broke into pieces and desorbed completely if in unsaturated condition. The film showed different apparent heights when different biases were used in VSPFM study, indicated polarized orientation of the ethanol molecules on the mica surface. It is a process of hours for the clusters or network structures to form a film on mica, which demonstrated that vapor ethanol molecule is not so easy to precipitate on mica as ethanol molecule in liquid stage. Microsc. Res. Tech. 2011. © 2011 Wiley‐Liss, Inc.