A nonliquid crystal azobenzene polymer was prepared.The obtained films exhibit fast bending response at room temperature,which can improve the efficiency of the transformation of energy from light to mechanical energy...A nonliquid crystal azobenzene polymer was prepared.The obtained films exhibit fast bending response at room temperature,which can improve the efficiency of the transformation of energy from light to mechanical energy.The surface structure of the relief gratings was investigated by atomic force microscopy.The depth of surface relief in a typical case is found to be around 94 nm.The product structures were characterize by UV light,1H NMR,AFM and Fourier transform infrared spectrum.展开更多
Manipulating motion of microobjects with light is indispensable in various technologies.On solid interfaces,its realizations,however,are hampered by surface friction.To resolve this difficulty,light-induced elastic wa...Manipulating motion of microobjects with light is indispensable in various technologies.On solid interfaces,its realizations,however,are hampered by surface friction.To resolve this difficulty,light-induced elastic waves have been recently proposed to drive microobjects against friction.Despite its expected applicability for arbitrary optical-absorptive objects,the new principle has only been tested with microsized gold plates.Herein,we validate this principle using a new material and report directional and continuous movements of a two-dimensional topological insulator(Sb2Te3)plate on an untreated microfiber surface driven by nanosecond laser pulses.The motion performance of the Sb2Te3 plate is characterized by a scanning electron microscope.We observe that the motion velocity can be controlled by tuning the average power of laser pulses.Further,by intentionally increasing the pulse repetition rate and exploiting the low thermal conductivity of Sb2Te3,we examine the thermal effects on actuation and reveal the motion instability induced by formations of microbumps on Sb2Te3 surfaces due to the Marangoni effects.Moreover,as the formed microbumps are heated to viscoelasticity states,liquid-like motion featuring asymmetry in contact angles is observed and characterized,which expands the scope of light-induced actuation of microobjects.展开更多
文摘A nonliquid crystal azobenzene polymer was prepared.The obtained films exhibit fast bending response at room temperature,which can improve the efficiency of the transformation of energy from light to mechanical energy.The surface structure of the relief gratings was investigated by atomic force microscopy.The depth of surface relief in a typical case is found to be around 94 nm.The product structures were characterize by UV light,1H NMR,AFM and Fourier transform infrared spectrum.
基金supported by the National Natural Science Foundation of China(Nos.61927820,61905201,and 62275221)。
文摘Manipulating motion of microobjects with light is indispensable in various technologies.On solid interfaces,its realizations,however,are hampered by surface friction.To resolve this difficulty,light-induced elastic waves have been recently proposed to drive microobjects against friction.Despite its expected applicability for arbitrary optical-absorptive objects,the new principle has only been tested with microsized gold plates.Herein,we validate this principle using a new material and report directional and continuous movements of a two-dimensional topological insulator(Sb2Te3)plate on an untreated microfiber surface driven by nanosecond laser pulses.The motion performance of the Sb2Te3 plate is characterized by a scanning electron microscope.We observe that the motion velocity can be controlled by tuning the average power of laser pulses.Further,by intentionally increasing the pulse repetition rate and exploiting the low thermal conductivity of Sb2Te3,we examine the thermal effects on actuation and reveal the motion instability induced by formations of microbumps on Sb2Te3 surfaces due to the Marangoni effects.Moreover,as the formed microbumps are heated to viscoelasticity states,liquid-like motion featuring asymmetry in contact angles is observed and characterized,which expands the scope of light-induced actuation of microobjects.
