Nanomechanical characterisation of multilayered organic-inorganic composite films produced by bioinspired processing routes

通过仿生加工路线生产的多层有机-无机复合薄膜的纳米力学表征

• 批准号: 15068179
• 负责人: Professor Dr. Joachim Bill
• 金额: --
• 依托单位: Max-Planck-Institut für Intelligente Systeme
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/15068179?language=en
• 关键词: Nanomechanical; characterisation; multilayered; organic; inorganic

This project aims at the nanomechanical investigation of organic-inorganic composite films synthesised via an established bioinspired route. A major goal is to impart superior mechanical properties on these biomimetic molecular architectures by the implementation of nature-derived molecular design principles. The envisioned composite films shall be fabricated on various types of surface-modified substrates through alternating layer-by-layer assembly of metal oxides as inorganic and charged polymers as organic components. While in the first stage of the project, titanium dioxide layers formed via low-temperature chemical bath deposition will be chosen as inorganic component of the multilayers, the investigations will then be extended to layers composed of vanadium oxide nanofibres with ultra-high aspect ratio. For the assembly of the latter type of layers, two deposition approaches will be used, in which either pre-formed fibres are adsorbed onto the surface, or the fibre growth is nucleated at suitable chemical surface sites. To investigate the mechanical properties of the composite films, nanoindentation and nanoscratch tests shall be employed, in order to determine hardness, Young s modulus, fracture toughness as well as the adhesion strength of the layers to the substrate. For this purpose, different procedures for analysing the nanoindentation/nanoscratch data will be critically evaluated with respect to their ability to cope with possible complications such as surface roughness and the influence of the substrate. On that basis, the importance of the multilayered architecture will be evaluated by comparing the nanoindenation data with those obtained from oxide monolayers as reference. Further to this testing, extensive structural characterisations will be made to enable a detailed correlation between the multilayer morphology/composition and their mechanical performance.

该项目旨在通过既定的生物启发路线合成的有机-无机复合膜的纳米力学研究。一个主要的目标是赋予这些仿生分子结构上的上级机械性能的实施自然衍生的分子设计原则。所设想的复合膜应通过金属氧化物作为无机物和带电聚合物作为有机组分的交替逐层组装在各种类型的表面改性基材上制造。在项目的第一阶段，通过低温化学浴沉积形成的二氧化钛层将被选为多层膜的无机成分，然后研究将扩展到由超高纵横比的氧化钒纳米纤维组成的层。对于后一种类型的层的组装，将使用两种沉积方法，其中预形成的纤维被吸附到表面上，或者纤维生长在合适的化学表面位点处成核。为了研究复合膜的机械性能，应采用纳米压痕和纳米划痕试验，以确定硬度、杨氏模量、断裂韧性以及层与基材的粘附强度。为此目的，不同的程序进行分析的纳米压痕/nanoscratch数据将严格评估他们的能力，以科普可能的并发症，如表面粗糙度和基板的影响。在此基础上，多层结构的重要性将通过比较纳米压痕数据与从氧化物单层作为参考获得的数据进行评估。除了这项测试之外，还将进行广泛的结构表征，以实现多层形态/组成与其机械性能之间的详细相关性。