Natural Gas purity on HVOF coatings using a commercial powder of D1008 (Iron based) on a Forged low alloy steel (AISI 8740)

Nanocomposites of Mg0.5Zn0.5Fe2O4 –Polyvinyl alcohol
were successfully synthesized using two steps: the nanoparticles
of Mg0.5Zn0.5Fe2O4 were synthesized via micro-emulsion
and then embedded into polyvinyl alcohol (PVA) matrix
by ultrasound assisted emulsion liquid phase method. This
approach can be solving problems in the dispersion and stabilization
of Mg0.5Zn0.5Fe2O4 nanoparticles in the PVA
matrix. The result showed that the prepared nanoparticles of
Mg0.5Zn0.5Fe2O4 diffuse homogeneously in a polyvinyl alcohol
matrix, maintaining the particle shape and size of the
Mg0.5Zn0.5Fe2O4 nanoparticles. It was found that the aggregation
of Mg0.5Zn0.5Fe2O4 nanoparticles could be reduced
under ultrasonic irradiation. High resolution transmission
electron microscopy (HRTEM) images reveal the presence
of spherically shaped nanoparticles in the polyvinyl alcohol
chains with an average size of 22nm. The XRD patterns indicate
that the crystalline structure of composite is single phase
cubic and the crystallite size decreases gradually from 44 to
22 nm by increasing concentration (0.1-0.5g) of nanoparticles
with PVA. The interaction between the PVA and nanoparticles
in nanocomposites samples were confirmed by Fourier-transform
infrared spectroscopy via the shifting of bands revealed
from Fourier-transform infrared spectra. The dielectric properties
are found to be higher for Mg0.5Zn0.5Fe2O4 -reinforced
blend systems than the pure blend system due to polarization
exerted by the incorporation of nanoparticles.Dielectric constant
and loss factor shows the decreases trend with varying
concentrations of nanoparticles with constant polymer concentration.
This occurred due to the grain boundary effect which
becomes dominant at low frequencies.

Author(s): Mujahid Mustaqeem

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