Computational study of dielectric composites with core-shell filler particles

TY - JOUR

T1 - Computational study of dielectric composites with core-shell filler particles

AU - Wang, Yu U.

AU - Tan, Daniel Q.

AU - Krahn, John

N1 - Funding Information: Support from AFRL Materials and Manufacturing Directorate under Grant No. FA8650-09-C-5001 is acknowledged. Y.U.W. also acknowledges support from NSF under Grant No. DMR-0968792. This computational research was supported in part by NSF through TeraGrid resources under Grant No. TG-DMR100033.

PY - 2011/8/15

Y1 - 2011/8/15

N2 - Phase field modeling and computer simulation is employed to study dielectric composites with core-shell filler particles for high-energy-density applications. The model solves electrostatic equations in terms of polarization vector field in reciprocal space using fast Fourier transform technique and parallel computing algorithm. Composites composed of linear constituent phases (matrix, core, and shell materials) of different dielectric constants are considered. Inter-phase boundary conditions are automatically taken into account without explicitly tracking inter-phase interfaces in the composites. The core-shell structures of filler particles are systematically investigated in terms of shell thickness and dielectric constant with respect to core size and matrix dielectric constant, respectively. The effects of filler particle size, shape, and orientation are considered. It is found that core-shell structures of filler particles provide effective means to mitigate local electric field concentration in dielectric composites, improving dielectric breakdown strength and energy density of the composites. Optimal design of core-shell filler particles requires low shell dielectric constant and thick shell coating as compared to core material and core size, respectively.

AB - Phase field modeling and computer simulation is employed to study dielectric composites with core-shell filler particles for high-energy-density applications. The model solves electrostatic equations in terms of polarization vector field in reciprocal space using fast Fourier transform technique and parallel computing algorithm. Composites composed of linear constituent phases (matrix, core, and shell materials) of different dielectric constants are considered. Inter-phase boundary conditions are automatically taken into account without explicitly tracking inter-phase interfaces in the composites. The core-shell structures of filler particles are systematically investigated in terms of shell thickness and dielectric constant with respect to core size and matrix dielectric constant, respectively. The effects of filler particle size, shape, and orientation are considered. It is found that core-shell structures of filler particles provide effective means to mitigate local electric field concentration in dielectric composites, improving dielectric breakdown strength and energy density of the composites. Optimal design of core-shell filler particles requires low shell dielectric constant and thick shell coating as compared to core material and core size, respectively.

UR - http://www.scopus.com/inward/record.url?scp=80052421730&partnerID=8YFLogxK

U2 - 10.1063/1.3624660

DO - 10.1063/1.3624660

M3 - 文章

AN - SCOPUS:80052421730

SN - 0021-8979

VL - 110

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 4

M1 - 044103

ER -