[SY-F3] Actuation in Metal-Polymer Nanocomposites: Chemoelectromechanical Coupling on Interfaces
Nanoporous metals have recently garnered interest as actuator materials because of their unique microstructure. The characteristic interconnected pore network and resulting high interface-to-volume ratio allows them to react sensitively to electric signals. By coating the metal backbone with ionically-activated polymers, increased actuation strains are achieved while still retaining the metal’s superior mechanical properties.
In understanding and modelling the chemoelectromechanically coupled behaviour of such nanocomposite actuators, one has to account for charge carrier transport and coupled effects in the polymer as well as effects arising from build-up of charges in and at the metal-electrolyte interface. We present an interface-extended continuum model that couples large deformations with electrostatics and charge carrier transport for the bulk and the interface. The developed framework utilises the concept of interface stresses to model the different coupling mechanisms occurring on the interface, that is, interface charging and electroadsorption, in addition to the coupled behaviour in the bulk material arising from mass transport in the pore space. This allows to study the different phenomena and their interaction with each other, giving insight into the underlying physical mechanisms. Simulations reveal that both, the nanocomposite’s structure and the ions’ mobilities, strongly affect the actuator’s response, providing the means to tailor the actuator’s behaviour to specialised applications.
References
[1] Wilmers, McBride, Bargmann, Interface Elasticity Effects in Polymer-Filled Nanoporous Metals, JMPS, 163-177, 2017.
[2] Wilmers, Bargmann, Functionalisation of Metal-Polymer-Nanocomposites: Chemoelectromechanical Coupling and Charge Carrier Transport, EML, accepted, 2018
[3] McBride, Javili, Steinmann, Bargmann, Geometrically nonlinear continuum thermomechanics with surface energies coupled to diffusion, JMPS 59, 2116-2133, 2011
[4] Soyarslan, Bargmann, Pradas, Weissmüller, 3d stochastic bicontinuous microstructures: generation, topology and elasticity, Acta Mater., 326-340, 2018
[5] Bargmann et al., Generation of 3d representative volume elements (RVEs) for heterogeneous materials: a review, Prog. Mater. Sci., accepted, 2018
In understanding and modelling the chemoelectromechanically coupled behaviour of such nanocomposite actuators, one has to account for charge carrier transport and coupled effects in the polymer as well as effects arising from build-up of charges in and at the metal-electrolyte interface. We present an interface-extended continuum model that couples large deformations with electrostatics and charge carrier transport for the bulk and the interface. The developed framework utilises the concept of interface stresses to model the different coupling mechanisms occurring on the interface, that is, interface charging and electroadsorption, in addition to the coupled behaviour in the bulk material arising from mass transport in the pore space. This allows to study the different phenomena and their interaction with each other, giving insight into the underlying physical mechanisms. Simulations reveal that both, the nanocomposite’s structure and the ions’ mobilities, strongly affect the actuator’s response, providing the means to tailor the actuator’s behaviour to specialised applications.
References
[1] Wilmers, McBride, Bargmann, Interface Elasticity Effects in Polymer-Filled Nanoporous Metals, JMPS, 163-177, 2017.
[2] Wilmers, Bargmann, Functionalisation of Metal-Polymer-Nanocomposites: Chemoelectromechanical Coupling and Charge Carrier Transport, EML, accepted, 2018
[3] McBride, Javili, Steinmann, Bargmann, Geometrically nonlinear continuum thermomechanics with surface energies coupled to diffusion, JMPS 59, 2116-2133, 2011
[4] Soyarslan, Bargmann, Pradas, Weissmüller, 3d stochastic bicontinuous microstructures: generation, topology and elasticity, Acta Mater., 326-340, 2018
[5] Bargmann et al., Generation of 3d representative volume elements (RVEs) for heterogeneous materials: a review, Prog. Mater. Sci., accepted, 2018