Large electrostrictive strain at gigahertz frequencies in a polymer nanoactuator: Computational device design
Alejandro Strachan, William A. Goddard III
Abstract
Using molecular dynamics with a first-principles-based force field (denoted MSXX), we show that large electrostrictive strains (similar to 5%) at extremely high frequencies (over similar to 10^(9) Hz) can be achieved in a poly(vinylidene-fluoride) nanoactuator if the packing density of the polymer chains is chosen appropriately. We control the packing density by assembling the polymer chains on a silicon < 111 > surface with one-half coverage. Under these conditions, the equilibrium, zero electric field conformation of the polymer contains a combination of gauche and trans bonds. This structure can be transformed to an all-T conformation by applying an external electric field. Such molecular transformation is accompanied by a large deformation in the direction of the polymer chains. The device shows typical electrostrictive behavior with strain proportional to the square of the polarization.
Group Members
Strachan, A. & III, W. A. G. (2005). Large electrostrictive strain at gigahertz frequencies in a polymer nanoactuator: Computational device design. *Applied Physics Letters*, *86*(8), Art. No. 083103. https://doi.org/10.1063/1.1862343