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首页> 外文期刊>Journal of Materials Research >Double-layer hydrogel with photoresponsive shape memory features for controllable catalysis
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Double-layer hydrogel with photoresponsive shape memory features for controllable catalysis

机译：具有光响应性形状记忆功能的双层水凝胶，可控催化

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摘要

A photoresponsive double-layer hydrogel has been developed, in which light-sensitive cinnamic moieties are grafted onto a polyacrylamide network to produce a photoresponsive layer and pure polyacrylamide formed the supporting layer. Ag nanoparticles were dispersed using in situ reduction on the photoresponsive layer to act as the catalyst. The as-fabricated hydrogel exhibits a shape memory effect and controllable catalytic behavior under an external light stimulus. When exposed to ultraviolet (UV) light at lambda 260 nm, the resulting cycloaddition of cinnamic moieties not only fix the hydrogel's temporary shape, but also greatly slow down the catalytic reaction rate. After irradiated with UV light at lambda 260 nm, however, the newly formed crosslinking points are reversibly cleaved. This results in the shape recovery of the hydrogel to its permanent shape. At the same time, the catalytic reaction was greatly accelerated because of the facile diffusion of the reactants into the hydrogel.
机译：已经开发了光响应性双层水凝胶，其中将光敏肉桂酸部分接枝到聚丙烯酰胺网络上以产生光响应层，并且纯聚丙烯酰胺形成支撑层。使用原位还原将银纳米颗粒分散在光响应层上以充当催化剂。所制造的水凝胶在外部光刺激下显示出形状记忆效应和可控制的催化行为。当暴露在λ> 260 nm的紫外线（UV）下时，肉桂酸酯部分的环加成反应不仅固定了水凝胶的临时形状，而且大大降低了催化反应速度。但是，在λ<260 nm的紫外线下照射后，新形成的交联点被可逆地裂解。这导致水凝胶恢复其永久形状的形状。同时，由于反应物容易扩散到水凝胶中，因此大大促进了催化反应。

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  • 来源
    《Journal of Materials Research》 |2019年第10期|1795-1804|共10页
  • 作者

    Leng Jinghang; Li Shujing; Yang Mingxin; Hu Jie;

  • 作者单位

    Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China;

    Beijing Technol & Business Univ, Key Lab Cosmet, China Natl Light Ind, Beijing 100048, Peoples R China;

    Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China;

    Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    composite; catalytic; polymer;

    机译：复合;催化;聚合物;

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