Materials Literature
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The stability of the [Mo 72 Fe 30 O 252 (CH 3 COO) 12 {Mo 2 O 7 (H 2 O)} 2 {H 2 Mo 2 O 8 (H 2 O)}(H 2 O) 91 ] · ∼150H 2 O polyoxometalate (Mo 72 Fe 30 ) with a buckyball framework structure in solution has been investigated as a function of the solute concentration, illuminance, the presence/absence of a polymer, and…
Thermal resistance between layers impedes effective heat dissipation in electronics packaging applications. Thermal conductance for clean and disordered interfaces between silicon (Si) and aluminum (Al) was computed using realistic Si/Al interfaces and classical molecular dynamics with the modified embedded atom metho…
The effects of stacking fault (SF) spacing and temperature on the mechanical properties of Mg with SF under c-axis tension are investigated by molecular dynamics (MD) simulations. The results indicate that there is an optimal SF spacing for mechanical properties of Mg containing SF. The results also show that the effe…
We report on the enhancement of photovoltaic performance in a graphene/polycrystalline BiFeO3 (BFO)/Pt heterojunction for the first time. The unique properties of the graphene electrode lead to a short circuit current density of 61 μA/cm2 and an open circuit voltage of 0.52 V in the heterojunction. These values are mu…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Theoretical studies have shown that electron-electron (e-e) and electron-hole (e-h) interactions play important roles in many observed quantum properties of graphene making this an ideal system to study many-body effects. In this report we show that spectroscopic ellipsometry can enable us to measure this interactions…
The aim of this research work is to investigate the preparation of polypyrrole/carbon nanotube (PPy/CNT) and polyaniline/carbon nanotube (PAn/CNT) nanocomposites in aqueous media by chemical polymerization of pyrrole and aniline in presence of ferric chloride and potassium iodate as an oxidants, respectively. The prod…
The changes of microstructure, strength, electrical conductivity and fracture micromechanisms of porous YSZ-Ni substrate as anode-supported solid oxide fuel cell (SOFC) material after the treatment in high temperature (600°C) reducing and oxidizing environments have been studied.
We present a calculation of the electron-phonon scattering rates in ideal monolayer graphene using the third-nearest-neighbor (3NN) tight-binding (TB) electronic Bloch wave functions formed by the analytical carbon 2pz orbitals with an effective nuclear charge of Zeff=4.14. With these wave functions, the band structur…
Polymer nanocomposites represent a class of materials that have assumed great importance in recent years and are the focus of extensive research. Unlike plastomer nanocomposites, the elastomer nanocomposites are in the stage of infancy in respect to their applications. In general, in polymer composites, the matrix and…
In this study corrosion rates of aluminum, copper, brass and Stainless Steel 304 (SS 304) in tequila are reported from potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) measurements. A simple kinetic model is proposed to analyze the polarization data and to establish a comparison with EIS m…
In this work, electric transport properties of CaCu3Ti4O12 (CCTO) thin films were investigated for resistive switching, rectifying and gas sensor applications. Single phase CCTO thin films were produced by polymeric precursor method (PPM) on different substrates and their electrical properties were studied. Films prod…
We studied the ferroelectric properties of GeTe and Ge2Sb2Te5 thin films through the analysis of capacitance-temperature, contact resonance piezoresponse force, resonance tracking piezoresponse force, and switching piezoresponse force microscopy measurements. These alloys are non-typical ferroelectric materials with l…
The corrosion inhibition of carbon steel (CS) using the “green” inhibitor, polyvinyl pyrrolidone (PVP) was investigated. This study was conducted at pH 7 and pH 8 in an aerated medium containing 0.1 M NaCl. The effects caused by some additives (KI and untreated clay) were investigated. The study was done over a range…
Nd-doped BiFeO 3 (BNF) thin films were fabricated on SrRuO 3 (SRO)-coated (100) Nb-doped SrTiO 3 substrates by pulsed laser deposition, and nondoped BiFeO 3 (BFO) thin films were also fabricated similarly for comparison. Then, Nd-doping effects on ferroelectric and photovoltaic properties were evaluated. Polarization-…
Thermoelectric generators (TEGs) can harvest thermal energy producing electrical power from a temperature gradient. They are often employed in dynamic thermal environments, therefore it is important to quickly and precisely track the best operating point to maximize the power production. This paper presents an innovat…
In this work, one-pot hydrothermal method was used for modifying a wood surface by the deposition of TiO 2 /ZnO coating at a relatively low temperature. The prepared wood samples were characterised using SEM, energy dispersive X-ray analysis and powder X-ray diffraction. Results showed that wood surface was coated by…
Both carbon nanotubes (CNTs) and graphene nanosheets (GNs) have potential applications in polymer composites. Combining them may induce a synergistic effect on enhancing the properties of composites. Herein, CNT-GN 3D hybrids were prepared by liquid injection chemical vapor deposition through a spray containing both c…
In this work, we present a systematic study on the complete control over the sphere diameters of MCM-41 nanospheres with different pore sizes. The mesoporous silica nanospheres with diameter range from 40 nm to 160 nm are synthesized by using cationic quaternary ammonium surfactants as template and TEOS as silicon sou…
Abstract In this work, a detailed structural and spectroscopic study of nanocrystalline diamond (NCD) thin films grown by a continuous bias assisted CVD growth technique is reported. This technique allows the tuning of grain size and phase purity in the deposited material. The crystalline properties of the films are c…