Mechanotransduction in Polyelectrolyte Brushes - Towards Mechanically Addressable Smart Surfaces
聚电解质刷中的力传导——迈向机械可寻址智能表面
基本信息
- 批准号:158439160
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Fellowships
- 财政年份:2009
- 资助国家:德国
- 起止时间:2008-12-31 至 2011-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The proposed project focuses on the question how polyelectrolyte (PE) brushes can convert mechanical deformation into well-defined chemical signals (“mechanotransduction”). PE brushes consist of charged polymer chains which are grafted with one end to a surface. In the planned project, the chemical environment in deformed PE brushes will be investigated. It is known that the vertical compression of a strong PE brush may induce the dissociation of immobilised dyes which is detectable by UV-vis spectroscopy. This approach will be extended to weak PE brushes, where compression alters the degree of dissociation of the PE brush itself. The degree of dissociation will be quantified by immobilised pH indicators. In a second step, the method will be applied to PE brushes on laterally stretchable supports where the grafting density is changed by mechanical deformation. Optical measurements will be supplemented by an electrochemical detection of the degree of dissociation of weak PE brushes on flexible gold strips. A more explorative part of the work aims at the creation of optical strain sensors which exploit changes of the co-ion distribution in the brush upon deformation. The planned set of experiments will provide detailed insight into the interior properties of PE brushes under deformation and form a basis for the development of mechanosensitive surfaces and bio-mimetic strain sensors.
该项目主要研究聚电解质(PE)电刷如何将机械变形转化为明确定义的化学信号(“机械转导”)。PE电刷由一端接枝到表面的带电聚合物链组成。在计划的项目中,将对变形PE刷的化学环境进行研究。众所周知,强力PE刷的垂直压缩可能会引起固定染料的解离,这是通过紫外可见光谱检测到的。这种方法将扩展到弱PE刷,其中压缩改变PE刷本身的解离程度。解离程度将通过固定化pH指示剂来量化。在第二步中,该方法将应用于横向可拉伸支架上的PE刷,其中接枝密度因机械变形而改变。光学测量将通过电化学检测弱PE刷在柔性金条上的解离程度来补充。这项工作的一个更具探索性的部分旨在创造光学应变传感器,利用电刷变形时co-ion分布的变化。计划中的实验将提供对PE刷在变形下的内部特性的详细了解,并为机械敏感表面和仿生应变传感器的开发奠定基础。
项目成果
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