This study investigated the precipitation
strengthening of the binary Al-0.14wt% Sc,
0.16% Ti alloy system. Ingots of Al-2.1wt% Sc
and Al-4.68wt% Ti were melted together, and
the nucleation, growth, and coarsening of
precipitates were analyzed. The microstructural
evolution of the nanoscale L12 precipitates
phase was examined with Vickers
microhardness testing,...
The effects of Ru, W, and Re on the temporal
evolution of the gamma prime precipitates in
a Ni-Cr-Al alloy were investigated by threedimensional
atom probe (3DAP) microscopy.
The spatial distribution of the gamma prime
precipitates in a model Ni-8.5Cr-10Al alloy
was investigated using atomic force
microscopy (AFM). We reported...
Fullerene and inorganic fullerene-like nanotubes
are molecules with the unique geometry
of a single layer or multiple layers of a bulk
material oriented in a tube. These molecules
have novel mechanical properties and great
potential in experimental systems for nanotechnology
and nanodevices. The threedimensional
atom-probe (3DAP) microscope
is an atomic...
While nanoscale device prototypes using
carbon nanotubes abound, no mass
production-scale technique exists for examining
properties of a batch of nanotubes.
Dielectrophoresis, on the other hand, has
received much attention in the press as a
method of separating and trapping particles.
In this research, a method of developing
mass production-scale...
Chemists and physicists have been interested
in the optical properties of metal nanoparticles
since the time of Michael Faraday.1
New approximation techniques for different
sizes and geometries have created renewed
interest in and investigation of these particles.
Many different arrays of particle extinctions
of various shapes and sizes have been...
In modern medicine, physicians destroy
otherwise healthy tissues in patients’ bodies
because of the lack of site-target specificity
and sensitivity in detecting and attacking
cancerous cells. Many cancer patients are
left with the difficult task of weighing the
benefits against the harm of undergoing
current cancer treatments. Members of the...
The effects of 13 nm Au colloid and 10 nm Ag
colloid on the growth of the yeast species
Saccharomyces cerevisiae were compared
to control samples cultured in a growth
media of yeast extract, bacto peptone, and
dextrose (YPD) to determine the toxicity of
nanoparticles. Growth curves were generated
for...
Transmission and reflection diffraction
gratings were fabricated by micropatterning
polymers on transparent substrates and
drop-coating polymers onto etched silicon
wafers. Exposure of these gratings to three
nerve toxin mimics at very low concentrations
resulted in mimic sorption by the polymers,
changing the polymer’s refractive
index. As a result, the grating’s...
Feedback-controlled lithography (FCL)
enables atomically precise patterning of
individual molecules on the technologically
significant Si(100)-2 x 1:H surface. However,
because it is performed in an ultrahigh vacuum
(UHV) environment, FCL has thus far
been restricted to surface chemistries that
can be delivered in the gas phase. The present
research attempts...
This research project explores two different
processes that can be used to pattern
organic molecules on silicon. In the first
process, hydrogen-terminated silicon surfaces
were anodized in nanometer scale with
a contact-mode atomic force microscope
(AFM). Anodization was done by applying a
positive bias voltage to the surface with
respect...
Recent research suggests that ultraviolet
illumination is essential for the creation of
monolayers of Undecylenic Acid Methyl
Ester (UDAME), as it is believed that the
UV illumination initiates the radical-chain
polymerization. Samples created without
UV illumination, however, also show signs
of a monolayer. In this study, samples were
analyzed using...
The development and applications of
organic/DNA molecules for the use of DNA
detection systems are reported here. In particular,
two different hybrids are synthesized:
DNA/polymer hybrids and small-molecule
DNA hybrids. DNA/polymer hybrids are especially
useful considering that their functionality
may be varied according to the polymer
selected. The hybrids are...
Several phosphonate-functionalized molecular
squares have been successfully synthesized,
and the fabrication of multilayer films
on both conductive and semiconducting
platforms has been demonstrated. These
films were grown using the well-documented
zirconium phosphonate multilayer method.
The layer-by-layer growth rate is uniform.
Experiments suggest, however, that the
molecular squares adopt a semi-collapsed...