Bidirectional Photomodulation of Surface Tension in Langmuir Films
Bidirectional Photomodulation of Surface Tension in Langmuir Films
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DOI：
10.1002/anie.201611187
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发表时间：
2017-01-02
影响因子：
16.6
通讯作者：
Feringa, Ben L.
中科院分区：
文献类型：
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作者：
Cheng, Jinling;Stacko, Peter;Feringa, Ben L.
以协作方式运行的能够将光能转换成机械运动的开关系统对于光学设备、数据存储、纳米级能量转换器和分子传感非常感兴趣。在此，光可切换单层在空气-水界面处由纯双(噻吨基)基光可切换两亲物或由光可切换两亲物与常规脂质二棕榈酰磷脂酰胆碱(DPPC)的混合物形成。两亲物中心核的反折叠几何结构到顺式折叠几何结构的有效光异构化会引起任一方向表面压力的变化，具体取决于初始分子密度。此外，在 DPPC 存在的情况下可以调节开关行为，从而影响分子的堆积，从而控制照射时的转变。基于双（噻吨基）的光可切换单层膜为探索协同性和运动放大提供了一个有前景的系统。
Switching systems operating in a cooperative manner capable of converting light energy into mechanical motion are of great interest for optical devices, data storage, nanoscale energy converters and molecular sensing. Herein, photoswitchable monolayers were formed at the air-water interface from either a pure bis(thiaxanthylidene)-based photoswitchable amphiphile or from a mixture of the photoswitchable amphiphile with a conventional lipid dipalmitoyl-phosphatidylcholine (DPPC). Efficient photoisomerization of the anti-folded to syn-folded geometry of the amphiphile's central core induces changes in the surface pressure in either direction, depending on the initial molecular density. Additionally, the switching behavior can be regulated in the presence of DPPC, which influences the packing of the molecules, thereby controlling the transformation upon irradiation. Bis(thiaxanthylidene)-based photoswitchable monolayers provide a promising system to explore cooperativity and amplification of motion.