Materials Literature
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In photothermal cancer therapy, gold nanoparticles and silica-gold nanoshells of specific shapes are used in order to generate heat by excitation of plasmons. We have investigated a different mechanism for heating metal nanoparticles: the Joule effect, whereby the energy resonantly absorbed from laser radiation first…
Gold nanoparticles have interesting properties of nano-antennas that focus the radiation field into relatively small, much smaller than the wavelength of radiation, regions. Optical and electronic properties of nano-wires experiencing huge field enhancement can be modified due to these plasmonic interactions. We have…
Abstract Ethylene polymerization catalysts have been prepared by grafting chromium (III) nitrate onto Al/SBA‐15 and Ti/SBA‐15 mesoporous materials. A combination of XRD, nitrogen adsorption, TEM, and inductively coupled plasma‐atomic emission spectroscopy (ICP‐AES), were used to characterize the catalysts. Polymerizat…
The yttrium-barium-copper oxide cuprate (YBCO) is well-known to exhibit superconducting properties in its YBa2Cu3O(6+x) phase for x close to 1. Oxygen depletion (x ≈ 0.3–0.5) of this compound leads, however, to a semiconductor. An unusual although promising application of YBCO in this semiconducting form can be sought…
The peaklike behavior of interface trap generation was observed in silicon-nanocrystal (Si-NC) memory during Fowler-Nordheim program/erase cycling. In addition to the two peaks at 0.3 and 0.85 eV from Pb0centers, two extra peaks (0.45 and 0.7 eV) were also observed and suggested from Pb1centers. In contrast, only Pb0c…
We present a rigorous investigation on elution behaviors of ultrasonically shortened multiwalled carbon nanotubes in size-exclusion chromatography. The size separation of five carbon nanotube samples that underwent ultrasonic shortening for varying lengths of time revealed the existence of three kinds of carbon specie…
5250-4 bismaleimide resin is used in high performance polymer matrix composites with high temperature aeronautical applications. This thesis investigated the thermal and oxidative degradation of 5250-4 neat resin powder in argon, air, and oxygen environments. The powder was aged at 163 deg. C, 177 deg. C, and 190 deg.…
Fabrication and magnetization characteristics of permalloy nanotube arrays that are in 100-nm-scale have been demonstrated. Permalloy nanotube array is made by using a standard electron-beam lithography combining with an ion-beam milling process. Geometric parameters of individual permalloy nanotube are fixed to be 30…
Theoretical studies of the spin transport through a magnetic superatom dimer (Cs(8)V)-(Cs(8)V) have been carried out within a density functional theory combined with nonequilibrium Green's-function formalism. It is shown that the electronic transport is sensitive to the binding site as well as the contact distance bet…
In the early nineteenth century, an English physician, Thomas Young, observed the liquid contact angle on a ridge surface and discovered the phenomena of capillary action on the principle of surface tension; a French scientist, Simon-Pierre Laplace, discovered the signi cance of meniscus radii with respect to capillar…
The sterically hindered title complex, [Fe(3)Te(2)(C(36)H(40)N(2))(CO)(7)], was obtained by substitution of two carbonyl groups in the [Fe(3)(μ(3)-Te)(2)(CO)(9)] cluster by the bulky redox-active N,N'-bis(2,6-diisopropylphenyl)acenaphthene-1,2-diimine (dpp-BIAN) ligand. The asymmetric unit contains two molecules of th…
A plasma system with a complementary filter to shield samples from damage during tetrafluoromethane (CF(4)) plasma treatment was proposed in order to incorporate fluorine atoms into gadolinium oxide nanocrystals (Gd(2)O(3)-NCs) for flash memory applications. X-ray photoelectron spectroscopy confirmed that fluorine ato…
We study the effects of elastic and inelastic scattering on the thermoelectric transport properties of molecular systems. These systems can exhibit high thermopower due to resonant transmission through molecular orbitals. We focus on systems which exhibit suppressed conductance near transmission antiresonances due to…
Abstract A new method for the processing of time-dependent isothermal depolarization current in oxide varistors is proposed. It involves (i) a new model for kinetics of the depolarization current, which is related to the parameters of the localized states, (ii) an account of the distribution of the relaxation time (wh…
We investigate the ensemble inequivalence of the spherical spin glass model with nonlinear interactions of polynomial order $p$. This model is solved exactly for arbitrary $p$ and is shown to have first-order phase transitions between the paramagnetic and spin glass or ferromagnetic phases for $p \geq 5$. In the param…
The equilibrium geometry and electronic structure of graphene on the most stable In-vacancy InAs(111)A surface has been investigated using the density functional and pseudopotential theories. The equilibrium distance between graphene and InAs(111) is found to be 3.05 Å with adsorption energy approximately 38 meV/C ato…
We propose a new computational approach for predicting the impact of point mutations on residual enzymatic activities. We build on the general linear trends existing between free energy and enthalpy of transfer of substrates from cytosol to enzyme active sites (protein–ligand binding), therefore linking the docking en…
In this paper, the impact of short fiber content, yarn count and yarn delivery speed on the structure and properties of fine count cotton vortex yarns were investigated. The factors affecting the fine count yarn spinning on a vortex spinning system were determined on the basis of yarn structure and properties by using…
A broadband and high efficiency metal–multilayer dielectric grating (MMDG), which was used to compress and stretch an ultra-short laser pulse in a chirped-pulse amplification (CPA) system, was designed. The diffraction characteristics of the MMDG were analyzed using the method of rigorous coupled wave analysis. The re…
We experimentally investigated complexation of oppositely charged bottle polymer brushes at the single-molecule level using AFM and CryoTEM. It was found that polyelectrolyte complexes have “scrambled-egg” morphology where oppositely charged polymer chains are not oriented parallel to each other but are intercrossed.…