Benetzung fester und flüssiger van der Waals-Filme

固体和液体范德华薄膜的润湿

• 批准号: 5107110
• 负责人: Professor Dr. Paul Leiderer
• 金额: --
• 依托单位: Fachbereich Physik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 1998
• 资助国家: 德国
• 起止时间: 1997-12-31 至 2004-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5107110?language=en
• 关键词: Benetzung; fester; und; fl; ssiger

The project deals with weakly bound van der Waals films formed by molecular hydrogen and the light noble gases. Such films usually display the phenomenon of triple point wetting, i.e. complete wetting of the liquid phase above the triple point temperature Tt and incomplete wetting of the solid phase below Tt. In recent experiments we have shown that this behavior does not change qualitatively when the adsobate-substate interaction is modified by preplating the substrate with thin inert buffer layers. This result is at variance with current theory. The origin for this discrepancy is not clear: it might be due to shortcomings in the theoretical treatment, but may also be caused by the nonideal substrate surfaces used in the experiment. In order to investigate this problem the experimental results obtained here are to be analyzed in close collaboration with a theoretical project (Prof. H. Löwen) in which computer simulations will be carried out which go beyond the existing phenomenogical theory. Future adsorbate-substrate combinations to be studied will also be selected on the basis of this comparison. Moreover, emphasis will be put on the in situ preparation of well-defined substrate and their characterization in order to study the role of disorder and inhomogeneities on the wetting behavior of solid van der Waals films.

该项目涉及由分子氢和轻惰性气体形成的弱束缚货车德瓦耳斯膜。这种膜通常显示三相点润湿现象，即在三相点温度Tt以上液相完全润湿，在Tt以下固相不完全润湿。在最近的实验中，我们已经表明，这种行为不会发生质的变化时，吸附剂基相互作用的修改预镀薄惰性缓冲层的基板。这个结果与目前的理论不一致。这种差异的起源尚不清楚：这可能是由于理论处理中的缺陷，但也可能是由实验中使用的非理想衬底表面引起的。为了研究这个问题，我们将与一个理论项目密切合作，对这里获得的实验结果进行分析。Löwen），其中将进行计算机模拟，超越现有的唯象理论。今后将研究的吸附物-基质组合也将根据这一比较加以选择。此外，重点将放在原位制备的定义明确的基板和他们的表征，以研究的作用，无序和不均匀性的固体货车德瓦尔斯膜的润湿行为。