Molecular structure of liquids at solid surfaces

液体在固体表面通常形成分子层状结构。即使是简单的有机液体，如短链烷烃或醇，也会形成多达五个分子层。关于这种分层的实验信息是从表面力测量获得的。在表面力实验中，测量在封闭的液体间隙上接近两个光滑固体表面所需的力。在这个项目中，表面力测量使用原子力显微镜和自制的粒子相互作用装置计划。作为液体醇，烷烃和其他简单的液体（分子量低于100克/摩尔，熔点低于0 °C）进行了研究。解决的一个重要问题是液体是否在孤立的表面或仅在有限的空间（这是不可避免的表面力实验）显示分层结构。因此，我们尝试用不同的基底（云母，氧化硅，金上的硫醇分子层，其他无机层状材料）和针尖材料（氮化硅，氧化硅，金上的硫醇分子层）进行实验。此外，尖端的半径系统地变化，保持材料特性恒定。

Liquids at solid surfaces often form a molecularly layered structure. Even for simple organic liquids such as short-chain alkanes or alcohols up to five molecular layers are formed. Experimental information about this layering is obtained from surface force measurements. In a surface force experiment the force required to approach two smooth solid surfaces over a closing liquid gap is measured. In this project surface force measurements using an atomic force microscope and a homebuilt particle interaction apparatus are planned. As liquids alcohols, alkanes and other simple liquids (molecular weight below 100 g/mol, melting point below O°C) are studied. One significant question addressed is whether the liquids show the layered structure at isolated surfaces or only in confined spaces (which is inevitable in a surface force experiment). Therefore, we indent to do experiments with different substrates (mica, silicon oxide, thiol mololayers on gold, other inorganic layered materials) and tip materials (silicon nitride, silicon oxide, thiol monolayers on gold). In addition, the radius of the tip is systematically varied keeping the material properties constant.