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14 September 2018 Motion of matter induced by light fueled molecular machines
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Materials which can be actuated by light have potential to lead to light fueled robots and machines. Such materials deform and move by the action of photo-active molecules; e.g. molecular machines. Azobenzene derivatives are such a molecules, and they undergo a high rate of light-induced cyclic molecular shape change from an elongated, trans form, to a more globular, cis form; a feature which imparts macroscopic motion into materials in the presence of intensity gradients. That is photoisomerization leads to matter motion in inhomogeneous irradiation light fields. In viscoelastic materials, matter motion, in concept, is due to competing forces, including viscous and photoisomerization forces, and possible radiation pressure and elastic forces, as well as random forces due to thermal fluctuations. In solid films of azopolymers, the photoisomerization force overcomes other forces due to softening and decrease of viscosity of the material by photoisomerization. In this paper, we give a brief overview of the theoretical concept of matter motion induced by photoisomerization; e.g. photochemical tweezing, and we show that light absorption provides the energy needed by the system for isomerization and matter motion.
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Sanaa Elhani and Zouheir Sekkat "Motion of matter induced by light fueled molecular machines", Proc. SPIE 10740, Molecular Machines, 1074007 (14 September 2018);

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