Light responsive liquid crystalline networks were prepared by photopolymerization of azobenzene-doped mesogen mixtures and applied for production of micro-actuators by a laser writing technique. Adjusting the cross-linker content was found to be an efficient and easy way to control the dynamics of lightinduced deformation from the micro-up to the macro-meter length scales. Starting from a complete characterization of the response of millimeter-sized stripes under irradiation with different sources (LED and laser light), micro-structures based on different monomer mixtures were analyzed for micro-actuator preparation. Double stripes, able to perform a light driven asymmetric movement due to the different mixture properties, were created by a double step process through a laser writing system. These results are a simple demonstration of an optically activated non-reciprocal movement in the microscale by a chemical material manipulation. Moreover, we demonstrate a rapid actuator dynamics that allows a movement in the second time scale for macrostructures and a millisecond actuation in the microscale.

Light activated non-reciprocal motion in liquid crystalline networks by designed microactuator architecture / Martella, D.; Antonioli, D.; Nocentini, S.; Wiersma, D. S.; Galli, G.; Laus, M.; Parmeggiani, C.. - In: RSC ADVANCES. - ISSN 2046-2069. - 7:32(2017), pp. 19940-19947. [10.1039/c7ra03224b]

Light activated non-reciprocal motion in liquid crystalline networks by designed microactuator architecture

Martella, D.;Nocentini, S.;Wiersma, D. S.;Parmeggiani, C.
2017

Abstract

Light responsive liquid crystalline networks were prepared by photopolymerization of azobenzene-doped mesogen mixtures and applied for production of micro-actuators by a laser writing technique. Adjusting the cross-linker content was found to be an efficient and easy way to control the dynamics of lightinduced deformation from the micro-up to the macro-meter length scales. Starting from a complete characterization of the response of millimeter-sized stripes under irradiation with different sources (LED and laser light), micro-structures based on different monomer mixtures were analyzed for micro-actuator preparation. Double stripes, able to perform a light driven asymmetric movement due to the different mixture properties, were created by a double step process through a laser writing system. These results are a simple demonstration of an optically activated non-reciprocal movement in the microscale by a chemical material manipulation. Moreover, we demonstrate a rapid actuator dynamics that allows a movement in the second time scale for macrostructures and a millisecond actuation in the microscale.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/66825
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