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The effect of crystal structure on the electromechanical properties of piezoelectric Nylon-11 nanowires.

ABSTRACT: Crystal structure is crucial in determining the properties of piezoelectric polymers, particularly at the nanoscale where precise control of the crystalline phase is possible. Here, we investigate the electromechanical properties of three distinct crystalline phases of Nylon-11 nanowires using advanced scanning probe microscopy techniques. Stiff ?-phase nanowires exhibited a low piezoelectric response, while relatively soft ?'-phase nanowires displayed an enhanced piezoelectric response.

SUBMITTER: Choi YS

PROVIDER: S-EPMC6009497 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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The effect of crystal structure on the electromechanical properties of piezoelectric Nylon-11 nanowires.

Choi Yeon Sik YS Kim Sung Kyun SK Williams Findlay F Calahorra Yonatan Y Elliott James A JA Kar-Narayan Sohini S

Chemical communications (Cambridge, England) 20180601 50

Crystal structure is crucial in determining the properties of piezoelectric polymers, particularly at the nanoscale where precise control of the crystalline phase is possible. Here, we investigate the electromechanical properties of three distinct crystalline phases of Nylon-11 nanowires using advanced scanning probe microscopy techniques. Stiff α-phase nanowires exhibited a low piezoelectric response, while relatively soft δ'-phase nanowires displayed an enhanced piezoelectric response. ...[more]

PMID: 29855641

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Project description:Electromechanical coupling defines the ratio of electrical and mechanical energy exchanged during a flexure cycle of a piezoelectric actuator. This paper presents an analysis of the dynamic electromechanical coupling factor (dynamic EMCF) for cantilever based piezoelectric actuators and provides for the first time explicit expressions for calculation of dynamic EMCF based on arrangement of passive and active layers, layer geometry, and active and passive materials selection. Three main cantilever layer configurations are considered: unimorph, dual layer bimorph and triple layer bimorph. The actuator is modeled using standard constitutive dynamic equations that relate deflection and charge to force and voltage. A mode shape formulation is used for the cantilever dynamics that allows the generalized mass to be the actual mass at the first resonant frequency, removing the need for numerical integration in the design process. Results are presented in the form of physical insight from the model structure and also numerical evaluations of the model to provide trends in dynamic EMCF with actuator design parameters. For given material properties of the active and passive layers and given system overall damping ratio, the triple layer bimorph topology is the best in terms of theoretically achievable dynamic EMCF, followed by the dual layer bimorph. For a damping ratio of 0.035, the dynamic EMCF for an example dual layer bimorph configuration is 9% better than for a unimorph configuration. For configurations with a passive layer, the ratio of thicknesses for the passive and active layers is the primary geometric design variable. Choice of passive layer stiffness (Young's modulus) relative to the stiffness of the material in the active layer is an important materials related design choice. For unimorph configurations, it is beneficial to use the highest stiffness possible passive material, whereas for triple layer bimorph configurations, the passive material should have a low stiffness. In all cases, increasing the transverse electromechanical coupling coefficient of the active material improves the dynamic EMCF.

Dataset Information

The effect of crystal structure on the electromechanical properties of piezoelectric Nylon-11 nanowires.

Publications

The effect of crystal structure on the electromechanical properties of piezoelectric Nylon-11 nanowires.

Similar Datasets

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