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Research Paper

Dielectric Properties of Electrospun PVP and PAN Nanocomposite Fibers at Various Temperatures

[+] Author and Article Information
W. S. Khan, R. Asmatulu

Department of Mechanical Engineering, Wichita State University, 1845 Fairmount, Wichita, KS 67260-0133

M. M. Eltabey

Department of Mechanical Engineering, Wichita State University, 1845 Fairmount, Wichita, KS 67260-0133; Department of Basic Engineering Science, Menoufiya University, Shebin El-Kom 32511, Egypt

J. Nanotechnol. Eng. Med 1(4), 041017 (Nov 02, 2010) (6 pages) doi:10.1115/1.4002533 History: Received August 02, 2010; Revised August 21, 2010; Published November 02, 2010; Online November 02, 2010

Dielectric properties of electrospun polyvinylpyrrolidone (PVP) and polyacrylonitrile (PAN) nanocomposite fibers were determined as a function of temperature and concentration in order to explore the possibility of using them as dielectric materials in different industrial applications. Multiwall carbon nanotubes and Ni0.6Zn0.4Fe2O4 (NiZn ferrite) were individually dispersed into the polymeric solutions of PVP and PAN and were then electrospun at various conditions. Thin layers of films were placed between two parallel Al electrode plates of the capacitance bridge prior to the measurements. We determined that nanoscale inclusions and temperature mainly affect the dielectric properties of the nanocomposite fibers. The dielectric studies can provide critical information for many electronic applications, such as loss of a cable insulator, the impedance of a substrate, and the frequency of a dielectric resonator.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

A schematic view of an electrospinning process currently utilized for nanofiber fabrication

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Figure 2

Schematic illustration of the parallel Al plate (left) and guarded and guard electrodes utilized for the capacitance measurements

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Figure 3

AFM image of Ni0.6Zn0.4Fe2O4 nanoparticles produced in our laboratory

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Figure 4

X-ray diffraction pattern of Ni0.6Zn0.4Fe2O4 nanoparticles

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Figure 5

SEM images of PVP and PAN electrospun fibers with various processing parameters: (a) PVP dissolved in ethanol at 85:15 ratio and electrospun at 20 kV, 25 cm separation distance and 2.5 ml/h pump speed, (b) the same condition of the previous one with the addition of 16% Ni0.6Zn0.4Fe2O4 nanoparticles, (c) PAN dissolved in DMF at 90:10 ratio and electrospun at 25 kV, 25 cm separation distance and 1 ml/h pump speed, and (d) the same condition of the previous one with the addition of 15% MWCNTs

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Figure 6

Dielectric constant values of PVP fibers as a function of (a) MWCNTs and (b) Ni0.6Zn0.4Fe2O4 nanoparticle concentrations at room temperature

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Figure 7

Dielectric constant values of PAN fibers as a function of (a) MWCNTs and (b) Ni0.6Zn0.4Fe2O4 nanoparticle concentrations at room temperature

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Figure 8

Dielectric constant values of PVP fibers as a function of (a) MWCNTs and (b) Ni0.6Zn0.4Fe2O4 nanoparticle concentrations at various temperatures

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Figure 9

Dielectric constant values of PAN fibers as a function of (a) MWCNTs and (b) Ni0.6Zn0.4Fe2O4 nanoparticle concentrations at various temperatures

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