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Investigation of the formability of thin nanoclay containing polyelectrolyte films on NiTi-substrates in humid environments

研究潮湿环境下 NiTi 基底上含有聚电解质薄膜的纳米粘土薄层的形成性

基本信息

批准号：
58242643
负责人：
Professor Dr.-Ing. Guido Grundmeier
金额：
--
依托单位：
Institut für Werkstoffkunde (IW)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/58242643?language=en
关键词：
Investigation formability thin nanoclay containing

项目摘要

For the understanding of the formability of thin nanoclay/polyelectrolyte films on metal substrates, layer-by-layer growth of polyelectrolyte layers in combination with the adsorption of exfoliated nanoclay is performed to deposit nanocomposite films of defined chemistry onto NiTi single crystal substrates. NiTi is chosen due to its pseudoelastic properties and the need to inhibit metal release in case of a biomedical application of this shape memory alloy. LBL polyelectrolyte films are chosen because of the defined electrostatic intermolecular forces and the possible conversion of electrostatic interactions to covalent bonds by thermal curing and the thereby special viscoelastic properties. The interface between the oxide covered NiTi-alloy and the thin composite film will be tailored by the self-assembly of bi-functional organophosphonic acids. The structure and chemical composition of the thin films will be analysed by spectroscopic and microscopic techniques. Each scientific group will perform special complementary in-situ measurements such as in-situ electron microscopy and in-situ electrochemical impedance spectroscopy to study the forming behaviour and the defect formation during and directly after the forming process. Thereby, the formability and selfrepair properties of the thin nanocomposite films can be directly correlated with the interfacial forces within the film (between the polyelectrolytes and between polyelectrolytes and the nanoclay), the interfacial forces between the film and the substrate and the morphology of the thin film. Moreover, the influence of the change in interfacial forces and the viscoelastic properties by incorporated water on the formability will be studied.

为了理解薄纳米粘土/NiTi膜在金属基底上的可成形性，进行NiTi层的逐层生长结合剥离的纳米粘土的吸附，以将限定化学性质的纳米复合材料膜存款到NiTi单晶基底上。选择NiTi是由于其伪弹性特性以及在该形状记忆合金的生物医学应用的情况下抑制金属释放的需要。选择LBL薄膜是因为其定义的静电分子间力和通过热固化可能将静电相互作用转化为共价键，从而具有特殊的粘弹性。氧化物覆盖的NiTi合金和薄的复合膜之间的界面将通过双官能有机膦酸的自组装来定制。薄膜的结构和化学成分将通过光谱和显微技术进行分析。每个科学小组将进行特殊的补充原位测量，如原位电子显微镜和原位电化学阻抗谱，以研究成形过程中和成形过程后的成形行为和缺陷形成。因此，纳米复合薄膜的可成形性和自修复特性可以与薄膜内的界面力（聚电解质之间以及聚电解质和纳米粘土之间）、薄膜和基底之间的界面力以及薄膜的形态直接相关。此外，将研究界面力和粘弹性的变化，通过引入水的可成形性的影响。