Reactivity of gypsum faces according to the relative humidity by scanning force microscopy

被引:30
作者
Finot, E
Lesniewska, E
Mutin, JC
Goudonnet, JP
机构
[1] UNIV BOURGOGNE,PHYS LAB,CNRS 5027,F-21011 DIJON,FRANCE
[2] UNIV BOURGOGNE,CNRS 5613,LAB RECH REACTIV SOLIDES,F-21011 DIJON,FRANCE
关键词
adhesion; atomic force microscopy; diffusion and migration; friction; gypsum; solid-liquid interfaces; surface chemical reaction; wetting;
D O I
10.1016/S0039-6028(97)00220-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This article reports the experimental observation of the stability of the different Faces of calcium sulphate dihydrate (gypsum CaSO4.2H(2)O) according to the relative humidity. Scanning Force Microscopy experiments were carried out with a view to discerning the topography of the surfaces, the chemical compositional domains, and in an attempt to evaluate the friction and viscoelastic propel ties of the surface. Our results indicate that the (010) Face of gypsum is hydrophilic and very reactive contrary to the less hydrophilic (120) and (<(1)over bar 01>) faces which remain stable depending on the relative humidity. It is clear from our results that a precipitation like process can be induced by the SFM tip. The dissolution of this precipitate depends on the amount of water in the meniscus between the probe and the surface. For the purpose of comparison, the cleaved surfaces of natural anhydrite (CaSO4), calcite (CaCO3), and muscovite mica were also observed. The Lateral Force Microscopy images provided the undisputed evidence that the process of dehydration of the (010) face actually occurs with a change of the elastic constant of the crystal. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:201 / 217
页数:17
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