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Using electrets to design concurrent magnetoelectricity and piezoelectricity in soft materials

Published online by Cambridge University Press:  21 November 2014

Zeinab Alameh ,
Qian Deng ,
Liping Liu  and
Pradeep Sharma
Zeinab Alameh
Affiliation:
Materials Program, University of Houston, Texas 77204, USA; and Department of Mechanical Engineering, University of Houston, Texas 77204, USA
Qian Deng
Affiliation:
Department of Mechanical Engineering, University of Houston, Texas 77204, USA
Liping Liu
Affiliation:
Department of Mathematics, Rutgers University, New Jersey, USA; and Department of Mechanical and Aerospace Engineering, Rutgers University, New Jersey 08854, USA
Pradeep Sharma*
Affiliation:
Materials Program, University of Houston, Texas 77204, USA; Department of Mechanical Engineering, University of Houston, Texas 77204, USA; and Department of Physics, University of Houston, Texas 77204, USA
*
a)Address all correspondence to this author. e-mail: psharma@uh.edu
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Abstract

Piezoelectricity and magnetoelectricity are contradictory properties with a rather limited set of natural (often hard) materials that exhibit both. Composite materials – almost always restricted to hard ones – provide a limited recourse with the attendant limitations of small strains, fabrication challenges among others. In this article, using the concept of electrets, we propose a simple scheme to design soft, highly deformable materials that simultaneously exhibit piezoelectricity and magnetoelectricity. We demonstrate that merely by embedding charges and ensuring elastic heterogeneity, the geometrically nonlinear behavior of soft materials leads to an emergent piezoelectric and magnetoelectric behavior. We find that an electret configuration made of sufficiently soft (nonpiezoelectric and nonmagnetic) polymer foams can exhibit simultaneous magnetoelectricity and piezoelectricity with large coupling constants that exceed the best-known ceramic composites. Moreover, we show that these properties can be tuned with the action of an external field.

Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 1: Focus Issue: Soft Nanomaterials , 14 January 2015 , pp. 93 - 100
Copyright
Copyright © Materials Research Society 2015 

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References

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