Materials Literature
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Spark plasma sintering ( SPS ) is a high current, low voltage process. Nevertheless, the system voltage (3–10 V) can be large enough to produce significant fields across a thin, insulating sample. A lumped circuit model is analyzed to estimate the magnitude of this field in terms of the die geometry. Normalizing the s…
The work described herein employs neutral alumina as an effective catalyst for ring opening of triarylpyrylium perchlorates to corresponding aromatic cyanodienones, which have main roles in biological activities. The present porous catalyst has several advantages, it is inexpensive, thermally and mechanically stable,…
This paper presents an optical element capable of multiplexing two diffraction patterns for two orthogonal linear polarizations, based on the use of non-resonant metamaterial cross elements. The metamaterial cross elements provide unique building blocks for engineering arbitrary birefringence. As a proof-of-concept de…
A novel incorporation of polyoxometalate (POM) into Cu2O photocathodes was achieved by electrostatic adsorption of polyoxometalate on Cu2O crystal faces, so that the Cu2O/POM composite films exhibit significant photovoltaic enhancement because the POM could act as electron-acceptor to retard the electron–hole recombin…
We use the tight-binding method to study spin-dependent exciton effects in zigzag-edged graphene nanoribbons (ZGNRs). Our results show the three spin-triplet excitons are not degenerate in energy due to different charge distributions: Electrons and holes are distributed on the opposite edges of ZGNRs for the triplets…
Combining mesoscale distinct element method simulations with analytical modeling, we predict the ability of individual single-wall carbon nanotubes to form stable ring windings with multiple turns, in spite of their remarkable stiffness. The stability of these structures arises from the energy balance between the bend…
The alignment of band energies between conductive oxides and semiconductors is crucial for the further development of oxide contacting layers in electronic devices. The growth of ultra thin films on the surface of an oxide material can be used to introduce a dipole moment at that surface due to charge differences. The…
Safety, lightweight design, and reduction of emissions are terms which are key issues in modern vehicle construction. These challenges can be met by new lightweight design strategies, e.g., by using lightweight materials and high-strength steels as well as innovative forming technologies such as media based press hard…
Using first principles calculations, the electronic and magnetic properties of the multiferroic LaMn2O5 have been studied. In particular, we have studied the magnetic stability of this material not only in ab-plane but also along c direction. Beside this, the exchange couplings between manganese ions have been calcula…
Abstract Significant progress has been achieved in the field of tissue engineering to create functional tissue using biomimetic three‐dimensional scaffolds that support cell growth, proliferation, and extracellular matrix production. However, many of these constructs are severely limited by poor nutrient diffusion thr…
There is an increasing interest in the thermoelectric (TE) properties of hybrid organic–inorganic structures, such as molecular junctions, organic–inorganic multilayers, and nanocomposites, owing to the recent success in nanostructuring of inorganic materials for high-efficiency thermoelectrics and the ability to synt…
Temperature-dependent and frequency-dependent dielectric investigations have been performed in TbMnO3 polycrystals sintered in either oxidative or reductive atmospheres. The results revealed the occurrence of two dielectric anomalies above 100 K, which are caused by the thermal activation of charge carriers and their…
The performance of biodegradable polymeric systems strongly depends on their physical as well as on their chemical properties. Therefore, detailed chemical analysis of such systems is essential. Enzymatic and chemical hydrolysis are the primary biodegradation mechanisms for these materials. This review provides an ove…
We investigate theoretically the spin-dependent transport and tunnel magnetoresistance in a system consisting of two ferromagnetic graphene (FG) electrodes separated by the Thue-Morse graphene superlattice (TMGSL) or periodic graphene superlattice (PGSL). Using transfer matrix methods, the spin-dependent conductance,…
We report results from an investigation into the plasmonic properties of metallic nanoparticles supported by graphene fabricated using two different methods. In the first method we used electron-beam lithography to produce ordered arrays of metallic nanoparticles. In the second method we used a technique based on elec…
We theoretically study the plasmon modes in double parallel metallic armchair graphene nanoribbons (AGNRs) separated by a distance ${L}_{b}$. Starting with a single doped metallic AGNR at zero temperature, we show the plasmon dispersion dependence on the Fermi wave vector. By evaluating the static dielectric function…
The reactivity of 0.5-1.4 nm iron nanoparticles and corresponding bulk surfaces has been systematically studied using density functional theory. The study includes both ideally symmetric and more realistic rugged nanoparticles. The activation energies for CO dissociation vary between 1.1 and 2.1 eV. An increasing part…
Abstract A series of alternating block polyurethanes (abbreviated as PULA‐alt‐PEG) and random block polyurethanes (abbreviated as PULA‐ran‐PEG) based on poly(l‐lactic acid) (PLA) and poly(ethylene glycol) (PEG) were synthesized. The differences of PULA‐alt/ran‐PEG chemical structure, molecular weight, distribution, th…
The modified fluorescence properties of a molecule in the vicinity of a metallic nanoparticle are further studied accounting for the possible existence of extraneous charges on the particle surface. This is achieved via a generalization of the previous theory of Bohren and Hunt for light scattering from a charged sphe…
Density functional theory (DFT) calculations are performed to study the mechanistic details of NO oxidation promoted by gold dimer anions. Furthermore, we studied a full catalytic cycle producing two NO2 molecules. The reaction is explored along three possible pathways. Our theoretical results show that anionic gold d…