Ferrofluid-based Stretchable Magnetic Core Inductors

15th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Lazarus, N.^1 ; Meyer, C.D.^1

Sensors and Electron Devices Dir., US Army Research Laboratory, Adelphi

MD, United States^1

关键词: Carrier liquid;    Inductance densities;    Low-frequency;    Nanoscale magnetic particles;    Stretchable electronics;    Transformer core;    Uni-axial strains;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/660/1/012007/pdf
DOI  :  10.1088/1742-6596/660/1/012007

来源: IOP

【 摘 要 】

Magnetic materials are commonly used in inductor and transformer cores to increase inductance density. The emerging field of stretchable electronics poses a new challenge since typical magnetic cores are bulky, rigid and often brittle. This paper presents, for the first time, stretchable inductors incorporating ferrofluid as a liquid magnetic core. Ferrofluids, suspensions of nanoscale magnetic particles in a carrier liquid, provide enhanced magnetic permeability without changing the mechanical properties of the surrounding elastomer. The inductor tested in this work consisted of a liquid metal solenoid wrapped around a ferrofluid core in separate channels. The low frequency inductance was found to increase from 255 nH before fill to 390 nH after fill with ferrofluid, an increase of 52%. The inductor was also shown to survive uniaxial strains of up to 100%.