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DOI	10.1073/PNAS.2102477118
	Flexoelectricity in soft elastomers and the molecular mechanisms underpinning the design and emergence of giant flexoelectricity
	Grasinger M.; Mozaffari K.; Sharma P.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:21
英文摘要	Soft robotics requires materials that are capable of large deformation and amenable to actuation with external stimuli such as electric fields. Energy harvesting, biomedical devices, flexible electronics, and sensors are some other applications enabled by electroactive soft materials. The phenomenon of flexoelectricity is an enticing alternative that refers to the development of electric polarization in dielectrics when subjected to strain gradients. In particular, flexoelectricity offers a direct linear coupling between a highly desirable deformation mode (flexure) and electric stimulus. Unfortunately, barring some exceptions, the flexoelectric effect is quite weak and rather substantial bending curvatures are required for an appreciable electromechanical response. Most experiments in the literature appear to confirm modest flexoelectricity in polymers although perplexingly, a singular work has measured a “giant” effect in elastomers under some specific conditions. Due to the lack of an understanding of the microscopic underpinnings of flexoelectricity in elastomers and a commensurate theory, it is not currently possible to either explain the contradictory experimental results on elastomers or pursue avenues for possible design of large flexoelectricity. In this work, we present a statistical-mechanics theory for the emergent flexoelectricity of elastomers consisting of polar monomers. The theory is shown to be valid in broad generality and leads to key insights regarding both giant flexoelectricity and material design. In particular, the theory shows that, in standard elastomer networks, combining stretching and bending is a mechanism for obtaining giant flexoelectricity, which also explains the aforementioned, surprising experimental discovery. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Flexoelectricity \| elastomers
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238548
作者单位	Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force BaseOH 45433, United States; UES, Inc., Dayton, OH 45432, United States; Department of Mechanical Engineering, University of Houston, Houston, TX 77204, United States; Department of Physics, University of Houston, Houston, TX 77204, United States
推荐引用方式 GB/T 7714	Grasinger M.,Mozaffari K.,Sharma P.. Flexoelectricity in soft elastomers and the molecular mechanisms underpinning the design and emergence of giant flexoelectricity[J],2021,118(21).
APA	Grasinger M.,Mozaffari K.,&Sharma P..(2021).Flexoelectricity in soft elastomers and the molecular mechanisms underpinning the design and emergence of giant flexoelectricity.Proceedings of the National Academy of Sciences of the United States of America,118(21).
MLA	Grasinger M.,et al."Flexoelectricity in soft elastomers and the molecular mechanisms underpinning the design and emergence of giant flexoelectricity".Proceedings of the National Academy of Sciences of the United States of America 118.21(2021).