• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Mechanically Responsive Crystals: Analysis of Macroscopic Strain Reveals 'Hidden' Processes
【24h】

Mechanically Responsive Crystals: Analysis of Macroscopic Strain Reveals 'Hidden' Processes

机译：机械响应晶体：宏观菌株的分析显示“隐藏”过程

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Mechanical response of single crystals to light, temperature, and/or force-an emerging platform for the development of new organic actuating materials for soft robotics-has recently been quantitatively described by a general and robust mathematical model (Chem. Rev. 2015, 115, 12440-12490). The model can be used to extract accurate activation energies and kinetics of solid-state chemical reactions simply by tracking the time-dependent bending of the crystal. Here we illustrate that deviations of the macroscopic strain in the crystal from that predicted by the model reveal the existence of additional, "hidden" chemical or physical processes, such as sustained structural relaxation between the chemical transformation and the resulting macroscopic deformation of the crystal. This is illustrated with photobendable single crystals of 4-hydroxy-2-(2-pyridinylmethylene)-hydrazide, a photochemical switch that undergoes E-to-Z isomerization. The irreversible isomerization in these crystals results in amorphization and plastic deformation that are observed as poor correlation between the transformation extent and the induced strains. The occurrence of these processes was independently confirmed by X-ray diffraction and differential scanning calorimetry. An extended mathematical model is proposed to account for this complex mechanical response.
机译：单个晶体的机械响应光，温度和/或力 - 用于开发用于软机器人的新有机致动材料的新兴平台 - 最近通过一般和强大的数学模型（Chem. 2015,115 ，12440-12490）。通过跟踪晶体的时间依赖性弯曲，该模型可用于简单地提取固态化学反应的精确活化能量和动力学。在这里，我们说明了模型预测的宏观菌株在晶体中的偏差揭示了附加的“隐藏”的化学或物理过程，例如化学转化与所得晶体的宏观变形之间的持续结构松弛。这用4-羟基-2-（2-吡啶基甲基） - 酰肼的光屈服单晶，一种经历E- Z异构化的光化学开关。这些晶体中的不可逆异构化导致非晶化和塑性变形，其观察到转化程度与诱导菌株之间的相关性差。通过X射线衍射和差示扫描量热法独立地确认这些方法的发生。建议扩展数学模型来解释这种复杂的机械响应。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号