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A Double-Layer Mechanochromic Hydrogel with Multidirectional Force Sensing and Encryption Capability

机译：具有双向力感应和加密功能的双层机械变色水凝胶

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摘要

Hydrogel-based soft mechanochromic materials that display colorimetric changes upon mechanical stimuli have attracted wide interest in sensors and display device applications. A common strategy to produce mechanochromic hydrogels is through photonic structures, in which mechanochromism is obtained by strain-dependent diffraction of light. Here, a distinct concept and simple fabrication strategy is presented to produce luminescent mechanochromic hydrogels based on a double-layer design. The two layers contain different luminescent species-carbon dots and lanthanide ions-with overlapped excitation spectra and distinct emission spectra. The mechanochromism is rendered by strain-dependent transmittance of the top-layer, which regulates light emission from the bottom-layer to control the overall hydrogel luminescence. An analytical model is developed to predict the initial luminescence color and color changes as a function of uniaxial strain. Finally, this study demonstrates proof-of-concept applications of the mechanochromic hydrogel for pressure and contact force sensors as well as for encryption devices.
机译：在机械刺激下显示色度变化的基于水凝胶的软机械变色材料引起了传感器和显示设备应用的广泛兴趣。产生机械变色水凝胶的一种常见策略是通过光子结构，其中机械变色是通过光的应变依赖性衍射获得的。在这里，提出了一个独特的概念和简单的制造策略，以基于双层设计生产发光的机械变色水凝胶。这两层包含不同的发光物质-碳点和镧系元素离子-具有重叠的激发光谱和不同的发射光谱。机械致变色是由顶层的应变依赖性透射率引起的，该透射率调节了底层的发光以控制整个水凝胶的发光。开发了一种分析模型来预测初始发光颜色和颜色变化，作为单轴应变的函数。最后，这项研究证明了机械变色水凝胶在压力和接触力传感器以及加密设备上的概念验证应用。

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  • 来源
    《Advanced Functional Materials》 |2019年第14期|1808191.1-1808191.8|共8页
  • 作者

    Zhu Qingdi; Van Vliet Krystyn; Holten-Andersen Niels; Miserez Ali;

  • 作者单位

    Singapore Alliance Res & Technol SMART Ctr CREATE, BioSyst & Micromech Interdisciplinary Res Grp, Singapore 138602, Singapore|Nanyang Technol Univ, Sch Mat Sci & Engn, Biol & Biomimet Mat Lab, Singapore 637553, Singapore;

    Singapore Alliance Res & Technol SMART Ctr CREATE, BioSyst & Micromech Interdisciplinary Res Grp, Singapore 138602, Singapore|MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA|MIT, Dept Biol Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA;

    MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA;

    Nanyang Technol Univ, Sch Mat Sci & Engn, Biol & Biomimet Mat Lab, Singapore 637553, Singapore|Nanyang Technol Univ, Sch Biol Sci, Singapore 637551, Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    double layer; encryption; lanthanides; luminescence; mechanochromic hydrogels;

    机译：双层;加密;镧系元素;发光;机械变色水凝胶;

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