In order to make conductive, biocompatible, and mechanically robust actuators for use in a variety of biomedical applications, we have synthesized new composite materials made from the biopolymer silk fibroin and the conducting polymer poly(pyrrole). Initial proof-of-concept experiments demonstrated that these composites bend under an applied voltage (or current) using a simple bilayer device geometry. Free-end bending actuation and tensile stress testing was conducted in phosphate buffered saline solutions to characterize the material properties in a biologically relevant setting, and identify the actuation mechanism. In addition to material characterization, actuation sequence programming was optimized to explore more efficient modes of actuation. Program sequences can be modified to fit the function of the actuator, allowing for optimized device life spans and strength of actuation. These methods are now being applied towards the construction and characterization of more efficient, complex three dimensional devices.

Characterizing material properties of silk-based poly(pyrrole) electromechanical actuators

247th National Meeting (2014)

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