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Mater Sci Nanotechnol 2017 | Volume 1 Issue 2
allied
academies
Nanomaterials and Nanochemistry
November 29-30, 2017 | Atlanta, USA
International Conference on
Q
uasicrystals are complex in nature and it has been
difficult to gain atomic scale understanding of catalytic
activity of leached quasicrystals. Additionally, the underlying
role of quasicrystals in the catalytic activity is yet to be
understood. In order to achieve this information, we have
attempted to create a simple model catalyst of nano particles
on quasicrystalline surfaces by leaching well defined surfaces
of single grain quasicrystals. As the first step of these studies,
we present here the effect of leaching treatments on surface
morphology and chemical composition of different Al-based
quasicrystals studied by scanning electron microscopy
(SEM), energy dispersive X-ray (EDX) analysis and X-ray
photoelectron spectroscopy (XPS). The high symmetry
surfaces of single grain icosahedral (i)-Al-Cu-Fe and decagonal
(d-) Al-Ni-Co, (d)Al-Cu-Co quasicrystals and a polygrain (i)-Al-
Pd-Re, (
i
)-Al-Cu-Fe, (
i
)-Al-Pd-Mn quasicrystal with random
surface orientation were leached with NaOH solution at
varying times and the resulting surfaces were characterized
by scanning electron microscopy, energy dispersive X-ray
analysis and X-ray photoelectron spectroscopy. The
leaching treatments preferentially remove Al producing
nano-particles of the transition metals and their oxides.
The leached fivefold surface of i-Al-Cu-Fe exhibits micron
sized dodecahedral cavities on which the nano-particles
are precipitated. However, no specific microstructure has
been observed on the tenfold surface of d-Al-Ni-Co and
the polygrain i-Al-Pd-Re. Quasicrystalline surface can be
regained after polishing the leached layer, indicating that
leaching occurs only in a limited depth from the surface. The
2 hour leached as grown and mechanically activated Al-Cu-
Fe alloys was subjected for catalyst application in hydrogen
storage materials. The catalytic effect of leached alloy on the
de/rehydrogenenation characteristics has been studied. The
hydrogenation behavior including absorption kinetics will be
discussed and presented in detail.
e:
yadavtp@gmail.comMetal and metal oxide nano-particles on quasicrystalline surface: A notable catalytic application in green
energy
T P Yadav
Rice University, USA