Andrieux Dominique, Acharid Abdelhaq, Fritsch Marie-Claire, Marquez Garcia Jose, Martin Martin Marcos, Méar Anne-Marie, Sadiki Mustapha, Huruguen Jean-Pierre, Olier René, Privat Mireille
UMR 6521-CR4, Département de Chimie, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, C.S.93837 - 29238 Brest Cedex 3, France.
Langmuir. 2004 Dec 7;20(25):11012-21. doi: 10.1021/la048067d.
Surface state changes described as phase transitions or simple molecular rearrangements have become a key issue in modern science. Indeed, they have an impact on the development of numerous (nano)technologies; they are also involved in biochemical and chemical mechanisms at the molecular level and also in environmental phenomena. At last, they have been at the origin of flourishing statistical descriptions that have illuminated new and very interesting aspects of surface behaviors. Here, to obtain still lacking coherent sets of experimental data on systems in which molecular interactions and thermodynamic properties are different, the adsorption behaviors of three aqueous mixtures in contact with a dense and homogeneous silica were studied versus concentrations and temperatures. Of course, these mixtures displayed very different bulk phase properties. Their stairlike isotherms are interpreted through surface phase diagrams; each of them is very similar to the corresponding bulk phase diagram. Their comparison gives new insights into the different surface states, the role of solvent in the surface, and the probable molecular mobility.
被描述为相变或简单分子重排的表面状态变化已成为现代科学中的一个关键问题。事实上，它们对众多（纳米）技术的发展产生影响；它们还涉及分子水平的生化和化学机制以及环境现象。最后，它们是蓬勃发展的统计描述的起源，这些描述揭示了表面行为的新的且非常有趣的方面。在此，为了获得关于分子相互作用和热力学性质不同的系统仍缺乏的连贯实验数据集，研究了三种与致密且均匀的二氧化硅接触的水性混合物的吸附行为随浓度和温度的变化。当然，这些混合物表现出非常不同的体相性质。它们的阶梯状等温线通过表面相图来解释；它们中的每一个都与相应的体相图非常相似。它们的比较为不同的表面状态、溶剂在表面的作用以及可能的分子迁移率提供了新的见解。
