湿度敏感

Abstract(#br)Stimuli responsive hydrogels may be promising materials for shape transforming structures due to their ability to deform significantly in response to an environmental stimulus without the need for external power. It is well-known that by laminating swelling hydrogels and non-swelling flexible materials, such as inert elastomers, bending actuation can be achieved. In this work, we report an improved hydrogel-elastomer bonding process and demonstrate the utility of the process with a stimuli-induced bi-directional hydrogel unimorph actuator.

湿度传感器已成为提高日常生活质量的重要需求。这里以软聚二甲基硅氧烷( PDMS )为芯层，以嵌有溶胀性MIL-88A的非溶胀聚偏氟乙烯( PVDF )为外层，制备了一种新型湿敏纤维。值得注意的是，PDMS纤维由于其光滑性、柔软性和良好的拉伸性能而被选择作为载体。具有可溶胀金属-有机骨架( MOFs )的异核FeⅢ二羧酸盐MIL-88家族能够在外界湿度变化的响应下发生可逆的动态结构转变。所制备的MOFs纤维对单一溶剂表现出三种形变，对不同体积比的双组分混溶体也具有良好的形变性能。作为概念的证明，采用相对湿度从10 %到90 %的形状记忆效应和模拟盐溶液代替相对湿度变化来评价湿度变化。此外，研究了这些现象之间的自变形机理，其中PDMS纤维的膨胀变形以及MIL - 88A在不同条件下的结构转变。