Mesoporous Hydrogels from Microemulsions and Similar Structures for Hydrogel-based Sensors

来自微乳液的介孔水凝胶和用于水凝胶传感器的类似结构

基本信息

项目摘要

Hydrogels are crosslinked polymers with the ability of uptaking huge amounts of water. This characteristic behavior leads to an increase of the hydrogel volume. Thus, hydrogels are the proper materials for applications in sensors and actuators, especially since hydrogels can be employed for utilization in micro systems.The swelling of huge hydrogel volumes results in detectable forces which can either be measured by means of a sensor or work as actuator components. However, the diffusion properties of water and chemical species in the crosslinked polymer structure of the hydrogel affect the response characteristics. Hence, high sensitivity often goes along with long response times.A solution may be the employment of porous hydrogels which can accelerate the cooperative diffusion process. Porous hydrogels in hydrogel-based piezoresistive pH sensors showed remarkable improvements in our previous works. Here, the response time of a pH sensor based on an acrylic acid/acrylamide based hydrogel was reduced considerably. Also, the swelling degree of the hydrogel increased noticeably. However, the sensitivity of the sensor decreased due to a decreased stiffness of the hydrogel. For this previous work, porous layers were synthesized by using porogens which cause a phase separation during polymerization. The use of porogens yields materials with macroporosity. Due to the synthesis method, the adjustment of pore sizes and pore size distribution is insufficient though.A possible route for synthesizing hydrogel layers with defined pore geometry is a template method described as follows. Mixtures of organic phase, water and surfactant are prepared. Stable, transparent solutions with defined aggregate structures (micelles, cylindrical micelles, bicontinuous, lamellae, hexagonal and cubic phases) occur at certain compositions. By dissolving monomers or polymers in the aqueous or organic phase of the template solution, the aggregate structures can be used as templates for the synthesis of mesoporous hydrogels with different morphologies.By using this method, firstly, the template is defined before polymerization. Secondly, replacement of macropores with mesopores leads to a higher hydrogel volume in the total volume of the hydrogel layer. For these reasons, this template method can evolve to be the preferred route to produce fast-responsive and sensitive hydrogels for microsystems technology.
水凝胶是具有吸收大量水的能力的交联聚合物。这种特征行为导致水凝胶体积的增加。因此,水凝胶是传感器和致动器中应用的合适材料,特别是因为水凝胶可以用于微系统中。巨大的水凝胶体积的溶胀导致可检测的力,该力可以通过传感器测量或作为致动器组件工作。然而,水和化学物质在水凝胶的交联聚合物结构中的扩散性质影响响应特性。因此,高灵敏度往往沿着着长的响应时间。解决方案可能是采用多孔水凝胶,可以加速合作扩散过程。多孔水凝胶在基于水凝胶的压阻式pH传感器中显示出显着的改进,在我们以前的工作。在此,基于丙烯酸/丙烯酰胺基水凝胶的pH传感器的响应时间显著缩短。此外,水凝胶的溶胀度显著增加。然而,由于水凝胶的刚度降低,传感器的灵敏度降低。对于这一先前的工作,多孔层是通过使用在聚合过程中引起相分离的致孔剂来合成的。致孔剂的使用产生具有大孔隙率的材料。然而,由于合成方法的原因,孔径和孔径分布的调节是不充分的。用于合成具有限定的孔几何形状的水凝胶层的可能途径是如下所述的模板方法。制备有机相、水和表面活性剂的混合物。具有确定的聚集体结构(胶束、圆柱形胶束、双连续相、层状相、六方相和立方相)的稳定、透明的溶液在某些组成下出现。通过将单体或聚合物溶解在模板溶液的水相或有机相中,形成的聚集体结构可以作为模板合成不同形貌的介孔水凝胶。其次,用中孔代替大孔导致水凝胶层的总体积中更高的水凝胶体积。由于这些原因,这种模板方法可以发展成为生产用于微系统技术的快速响应和敏感水凝胶的首选途径。

项目成果

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Professor Dr.-Ing. Gerald Gerlach其他文献

Professor Dr.-Ing. Gerald Gerlach的其他文献

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{{ truncateString('Professor Dr.-Ing. Gerald Gerlach', 18)}}的其他基金

Nanostructured absorption and emission layers for thermal infrared detectors and emitters
用于热红外探测器和发射器的纳米结构吸收和发射层
  • 批准号:
    267557604
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Verschlusslose thermische Infrarot-Sensorarraysysteme mit kleiner Messunsicherheit
无快门热红外传感器阵列系统,测量不确定度小
  • 批准号:
    212029120
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Electrocaloric multilayer cooling device concepts
电热多层冷却装置概念
  • 批准号:
    226684348
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Hydrogelsensoren der zweiten Generation
第二代水凝胶传感器
  • 批准号:
    139859838
  • 财政年份:
    2009
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Untersuchungen an leitfähigen Polymerkompositen zur Anwendbarkeit in Mikrobolometer-Arrays
导电聚合物复合材料在微测辐射热计阵列中的应用研究
  • 批准号:
    63239806
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Höchstdetektive pyroelektrische Infrarotsensoren mit interner thermischer Verstärkung
具有内部热放大功能的高度探测热释电红外传感器
  • 批准号:
    101803911
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Niedertemperatur-Plasmaabscheidung von Perowskit-Dünnschichten auf Folien unedler Metalle und auf Polymerfolien
基底金属箔和聚合物箔上钙钛矿薄膜的低温等离子体沉积
  • 批准号:
    61887668
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Numerische und experimentelle Untersuchung des gekoppelten chemo-elektro-mechanisch, visko-hyperelastischen Verhaltens von Hydrogelen für Aktor- und Sensoranwendungen
用于致动器和传感器应用的水凝胶的化学-机电、粘性-超弹耦合行为的数值和实验研究
  • 批准号:
    27747500
  • 财政年份:
    2006
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Electron-emitting perovskite tips fpr innovative material evaluation
用于创新材料评估的电子发射钙钛矿尖端
  • 批准号:
    5415429
  • 财政年份:
    2003
  • 资助金额:
    --
  • 项目类别:
    Research Units
Ionenstrahlmodifizierung von polymeren Funktionsschichten zur gezielten Einstellung von Sensorfunktionen
聚合物功能层的离子束改性,用于有针对性地调整传感器功能
  • 批准号:
    5158996
  • 财政年份:
    1999
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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CAREER: Robust, Reversible, and Stimuli-responsive Thermodynamic Adhesion in Hydrogels
事业:水凝胶中稳健、可逆且刺激响应的热力学粘附
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