Effects of the polyvinyl alcohol (PVA) on the synthesis of alumina fibers through electrospinning technique
Abstract
Ceramic fiber products especially
alumina has good properties such as high
modulus and strength that were resistant
toward the attacks of molten metals and nonoxide
materials up to 1000°C and also have
low thermal conductivity and high melting
point. Alumina is a well-known structural
material among functional ceramics in the
area of catalysts, microelectronics and optic,
both in pure or doped form as well as in
combination with others. In this work,
alumina fiber was synthesized by sol-gel
electrospinning technique (e-spinning). The
sol was prepared by mixing aluminum nitrate
nonahydrate (ALN) and aluminum
isopropoxide at 3 molar ratios. The precursor
sol was stirred vigorously for 24 hours until
ALP completely dissolved. After stirring, the
precursor sol with PVA and without PVA was
evaporating to obtain the suitable viscosity to
spin. The rheology and viscosity were checked
by viscometer. At the appropriate viscosity,
the sol was spin into fibers using
electrospinning machine. The green fibers
were then dried at room temperature then
calcined at 1200°C. The fibers produced were
characterized using X-Ray Diffraction (XRD)
and Field Emission Scanning Electron
Microscope (FESEM). The XRD analysis had
shown the -alumina was formed at 1200 °C
and SEM micrograph shows the formation of
fibers with PVA addition.
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