Biomedical Engineering Reference
In-Depth Information
3.4
UV-VIS spectra of AZO/epoxy nanocomposites: (a) transmittance;
(b) absorbance.
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Their experimental results showed that a nanocomposite with a thickness of
about 3.5mm containing an extremely low content (0.08 wt%) of AZO
nanoparticles after calcination at 600
C would have excellent overall optical
properties, having UV-shielding efficiency greater than 85% at
8
360 nm and
~
good visible transmittance greater than 70% at
650 nm. Moreover, AZO
addition in the composite was found to change the IR light absorptive
capability. Therefore, a nanocomposite containing AZO shows enhanced IR
shielding efficiency compared to that of the epoxy matrix and the
nanocomposite containing pure ZnO nanoparticles. The as-prepared
transparent AZO/epoxy nanocomposites have potential for use in a range
of engineering applications such as UV- and IR-shielding windows, contact
lenses and heat mirrors.
Rare earth (RE) ions are generally incorporated into a glass in their
trivalent state. However, some of the RE ions can exist in a divalent state as
well. These divalent RE ions show very strong emission because of the
dipole-allowed electronic transition. Glasses doped with Sm
2+
or Eu
2+
~
