Dünne Filme - Steuerung kristalliner Morphologien über Strukturbildung auf mikroheterogenisierten Oberflächen

表面的非平衡生长过程产生了典型的形貌特征，这主要受组元向结构单元生长前沿的扩散行为的影响。因此，即使对于非常不同的系统，如凝固过程的生长模式或基质上细菌的生长模式，扩散限制聚集过程的形态模式也是非常相似的。对于与非均质表面接触的聚乙烯薄膜中的结晶，我们发现结晶和去湿似乎是竞争过程。用十二烷基硫代羧酸微接触印迹法制备了具有局部不同自由表面能的化学非均相金表面。在异质表面上形成的薄膜在不同的表面积内表现出不同的形貌特征。薄膜形貌表现出除湿和扩散控制晶体生长过程的特征。薄膜的检测首选原子力显微镜和激光扫描电子显微镜。未来的实验重点是更详细地研究超薄聚合物薄膜的形态特征(包括结晶学精细结构)，这些特征与在具有不同尺寸的磁区的异质表面上形成薄膜有关。与结晶PE平行，应研究异构化表面上超薄膜中的刚性棒状聚合物(聚-(二正己基)硅烷)。从其他基团的运动学研究中发现了动力学表面性质的影响，并用Avrami动力学进行了量化。我们的实验将集中在聚二己基硅烷的形态结构如何受下表面控制的问题上。

Non-equilibrium growth processes on surfaces produce typical morphological features which are mainly influenced by the diffusion behaviour of components to the growth front of the structural unit. The morphological patterns from diffusion limited aggregation processes are therefore very similar even for very different systems such as the growth patterns from solidification processes or the growth of bacteria on substrates.For crystallisation in thin films of polyethylene in contact with hererogeneous surfaces we found that crystallisation and dewetting appear as competitive processes. Chemically heterogeneous gold surfaces with locally different free surface energies are prepared by micro-contactprinting with 12-undecanthiocarboxylicacid. The films formed on the heterogenized surfaces exhibit different morphological features within the different surface areas. Film morphologies show features characteristic for dewetting as well as for diffusion controlled crystal growth processes. The examination of films is preferently done by AFM and LVSEM.Future experiments focus on a more detailled investigation between the morphological features (including crystallographic fine structure of ultrathin polymer films) which are related to the film formation on heterogenized surfaces with domains of different size ... and shape.Parallel to the crystallisation PE a rigid-rod polymer (Poly-(di-n-hexylsilan)) in ultrathin films on heteronenized surfaces should be investigated. From kinetical investigations of other groups an influence of surface properties of the kinetics has been found and quantified in terms of Avrami kinetics. Our experiments will focus on the question how morphological structures in the Poly-(di-n-hexylsilan) can be influenced by control of the underlying surface.