Photomechanical bimorph fibers

Abstract

Photomechanical actuators are a promising alternative to electrical actuators. Photomechanical actuators can be made of lightweight materials arranged in a simple system with few components, being powered solely by a light source. The result of this would be lighter motorized systems that are less prone to malfunction and damage. Such an actuator was developed in the form of a fiber backfilled with a low melting point wax, eicosane. The operating mechanisms for this fiber are based on bimorph actuator theory and the use of a photoactive additive. By drawing a PMMA fiber with a continuous and uniform cavity throughout the entirety of the length of fiber, and then backfilling it with eicosane, which has disparate mechanical and thermal properties, a bimorph actuator is made. Filled fibers were observed during actuation under an optical microscope with a heated stage and their mechanical response is discussed.