Eby Thomas, Thachil; Ayswarya, E P; Beena, Abraham T(Wiley Online Library, October 20, 2011)
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Abstract:
Ash-based polymer composites are assuming
increasing importance because of the pollutant potential,
fine particle size, and low price of ash. Fly ash and
rice husk ash are two prominent ash materials on which
some investigations have already been done for potential
use in polymer composites. This article highlights the
results of a study on the use of wood ash in HDPE. Wood
ash is mainly a mixture of various metallic compounds
and some silica. Here, the characterization of wood ash
has been done with the help of XRD, ICPAES, light scattering
based particle size analysis, FTIR, and SEM. The
results show that wood ash particle size has an average
value of 293 nm, much lower than other categories of ash.
When blended with HDPE in the presence of a compatibilizer,
wood ash gives rise to vastly improved mechanical
properties over that of the base polymer. The results
prove that wood ash is a valuable reinforcing material for
HDPE and the environmental pollution due to wood ash
can be solved in a most profitable way by this technique.
Description:
Journal of Applied Polymer Science, Vol. 124, 1659–1667 (2012)
Litty, Irimpan; Nampoori, V P N; Radhakrishnan, P(Elsevier, 2008)
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Abstract:
In this Letter we present the spectral and nonlinear optical properties of ZnO–Ag nanocomposites prepared by colloidal chemical synthesis. Obvious enhancement of ultraviolet (UV) emission of the samples is observed and the strongest UV emission is over three times than that of pure ZnO. These nanocomposites show self-defocusing nonlinearity and good nonlinear absorption behaviour which increases with increasing Ag volume fraction. The observed nonlinear absorption is explained through two photon absorption followed by free carrier absorption. ZnO–Ag is a potential nanocomposite material for the UV light emission and for the development of nonlinear optical devices with a relatively small limiting threshold.
Anantharaman, M R; Senoy, Thomas; Sakthi Kumar, D; Yasuhiko, Yoshida(Springer, December 31, 2006)
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Abstract:
Sol–gel glasses with Fe3O4 nanoparticles having particle sizes laying in the range 10–20 nm were encapsulated
in the porous network of silica resulting in nanocomposites having both optical and magnetic
properties. Spectroscopic and photoluminescence studies indicated that Fe3O4 nanocrystals are embedded
in the silica matrix with no strong Si–O–Fe bonding. The composites exhibited a blue luminescence. The
optical absorption edge of the composites red shifted with increasing concentration of Fe3O4 in the silica
matrix. There is no obvious shift in the position of the luminescence peak with the concentration of Fe3O4
except that the intensity of the peak is decreased. The unique combinations of magnetic and optical
properties are appealing for magneto–optical applications.
Description:
Journal of Nanoparticle Research (2008) 10:203–206
Sol–gel glasses with Fe3O4 nanoparticles having particle sizes laying in the range 10–20 nm were encapsulated
in the porous network of silica resulting in nanocomposites having both optical and magnetic
properties. Spectroscopic and photoluminescence studies indicated that Fe3O4 nanocrystals are embedded
in the silica matrix with no strong Si–O–Fe bonding. The composites exhibited a blue luminescence. The
optical absorption edge of the composites red shifted with increasing concentration of Fe3O4 in the silica
matrix. There is no obvious shift in the position of the luminescence peak with the concentration of Fe3O4
except that the intensity of the peak is decreased. The unique combinations of magnetic and optical
properties are appealing for magneto–optical applications.