Perrot Alexis, Wang Wen-Zhi, Buhler Eric, Moulin Emilie, Giuseppone Nicolas
SAMS Research Group, Université de Strasbourg, CNRS, Institut Charles Sadron UPR 22, 67000, Strasbourg, France.
School of Chemistry, University of Birmingham, Birmingham, B15 2TT, UK.
Angew Chem Int Ed Engl. 2023 Mar 20;62(13):e202300263. doi: 10.1002/anie.202300263. Epub 2023 Feb 14.
The unidirectional rotation of chemically crosslinked light-driven molecular motors is shown to progressively shift the swelling equilibrium of hydrogels. The concentration of molecular motors and the initial strand density of the polymer network are key parameters to modulate the macroscopic contraction of the material, and both parameters can be tuned using polymer chains of different molecular weights. These findings led to the design of optimized hydrogels revealing a half-time contraction of approximately 5 min. Furthermore, under inhomogeneous stimulation, the local contraction event was exploited to design useful bending actuators with an energy output 400 times higher than for previously reported self-assembled systems involving rotary motors. In the present configuration, we measure that a single molecular motor can lift up loads of 200 times its own molecular weight.
化学交联的光驱动分子马达的单向旋转被证明会逐渐改变水凝胶的溶胀平衡。分子马达的浓度和聚合物网络的初始链密度是调节材料宏观收缩的关键参数，并且这两个参数都可以使用不同分子量的聚合物链进行调节。这些发现促成了优化水凝胶的设计，其显示出约5分钟的半衰期收缩。此外，在非均匀刺激下，利用局部收缩事件设计了有用的弯曲致动器，其能量输出比先前报道的涉及旋转马达的自组装系统高400倍。在当前配置中，我们测量到单个分子马达能够提起其自身分子量200倍的负载。
