Document Type

Thesis - Open Access

Award Date

2018

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Advisor

Zong Hu

Keywords

Ferrite magnetic nanoparticles, Finite element analysis, Magnetic and Dielectric properties, Microwave, Nanocomposites, Radiation absorbent

Abstract

The purpose of this study is to simulate and synthesize a Radar (or Radiation) Absorbent Material (RAM) by using polymers and nickel zinc ferrite (Ni0.5Zn0.5Fe2O4) magnetic nanoparticles. There is an ardent desire in military, space and electronics for lighter, faster, cheaper and widespread bandwidth providing RAM materials. Electromagnetic property such as magnetic permeability and electric permittivity play a major in controlling the radiation. The appropriate combination of permeability and permittivity properties is acquired for the synthesis of RAM providing wide-ranging bandwidth. The apt property is achieved by rule of mixture, mixing of particular composition of epoxy polymer having low permeability and permittivity with the nickel zinc ferrite magnetic nanoparticle having high permeability and permittivity. In this investigation, we studied the effective relative permeability and permittivity of Ni0.5Zn0.5Fe2O4 nanoparticles encapsulated within the epoxy polymer resin through Finite Element Analysis (FEA) and several various analytical experiments to verify and match both the simulation and experimental results. The FEA model was explored in two different aspect. First, shape of the nanoparticle is assumed to be spherical, cubic and bar structure. Secondly, the distribution of nanoparticle in the epoxy polymer matrix is assumed to be Simple Cubic (SC), Body Center Cubic (BCC), Face Center Cubic (FCC) and Random distributed unit cell. The result is compared with analytic approaches (Maxwell-Garnett (M-G) theory, Bruggeman theory) and Vibrating Sample Magnetometer (VSM) experimental data.

Library of Congress Subject Headings

Composite materials.
Nanoparticles.
Magnetic structure.
Finite element method.

Description

Includes bibliographical references (pages 76-78)

Format

application/pdf

Number of Pages

88

Publisher

South Dakota State University

Rights

In Copyright - Educational Use Permitted
http://rightsstatements.org/vocab/InC-EDU/1.0/

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