Electric field distribution around asymmetric agglomerate model reconstructed from FIB–SEM images of epoxy nanocomposite

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2023-01-12 DOI:10.1049/nde2.12042
Kazuma Tagawa, Muneaki Kurimoto, Toru Sawada, Shigeyoshi Yoshida, Takahiro Umemoto, Hirotaka Muto
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Abstract

This study focussed on determining the electric field distribution formed by asymmetric agglomerates in order to elucidate the mechanism by which large agglomerates reduce the dielectric breakdown strength of nanocomposites. Epoxy nanocomposite sample was prepared by adding 2.5 vol% of TiO2 nanoparticles with a primary particle size ranging from 30 to 50 nm. The three-dimensional (3D) structure of the epoxy nanocomposites with a thickness of 5 μm was analysed via focussed ion beam and scanning electron microscopy. The 3D reconstruction was performed using 250 observation images, and a 3D model of the particle in the observational range was obtained. The electric field distribution for the 3D model of the agglomerate with the largest size was determined using the finite element method. In addition, we constructed a calculation model that effectively accommodate changes in the direction of the applied electric field. Subsequently, we examined the changes in the maximum electric field intensity around the agglomerate.

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利用FIB-SEM图像重建环氧纳米复合材料不对称团聚体模型的电场分布
为了阐明大团聚体降低纳米复合材料介电击穿强度的机理,研究了不对称团聚体形成的电场分布。通过添加2.5 vol%的TiO2纳米粒子制备环氧纳米复合材料样品,初始粒径为30 ~ 50 nm。利用聚焦离子束和扫描电镜对厚度为5 μm的环氧纳米复合材料的三维结构进行了分析。利用250张观测图像进行三维重建,得到观测范围内粒子的三维模型。采用有限元法确定了最大粒径团聚体三维模型的电场分布。此外,我们建立了一个计算模型,有效地适应了外加电场方向的变化。随后,我们研究了团块周围最大电场强度的变化。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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