Materials Literature
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Acceptor-type defects in highly n-type InN are probed using positron annihilation spectroscopy. Results are compared to Hall effect measurements and calculated electron mobilities. Based on this, self-compensation in n-type InN is studied and the microscopic origin of compensating and scattering centers in irradiated…
We investigated the electronic and magnetic properties of the pyrochlore oxide Cd$_2$Os$_2$O$_7$ using the density-functional theory plus on-site repulsion ($U$) method, and depict the ground-state phase diagram with respect to $U$. We conclude that the all-in/all-out non-collinear magnetic order is stable in a wide r…
Ion implantation is an interesting method to dope semiconducting materials such as zinc oxide provided that the implantation-induced defects can be subsequently removed. Nitrogen implantation followed by anneals under O2 were carried out on zinc oxide nanowires in the same conditions as in a previous study on bulk ZnO…
The gate-voltage (VG) dependence of the contact resistance (RC) in graphene field-effect transistors is characterized by the transmission line model. The RC-VG characteristics of Ag, Cu, and Au contacts display a dip around the charge neutrality point and become even negative with Ag contacts. The dip structure is wel…
Temperature dependent electrical resistivity, crystal structure and heat capacity measurements reveal a resistivity drop and metal to semiconductor transition corresponding to first order structural phase transition near 400 K in Ca3Co4O9. The lattice parameter c varies smoothly with increasing temperature, while anom…
We propose a hydrodynamic model describing steady-state and dynamic electron and hole transport properties of graphene structures which accounts for the features of the electron and hole spectra. It is intended for electron-hole plasma in graphene characterized by high rate of inter-carrier scattering compared to exte…
xBaZrO3-(1−x)BaTiO3 solid solutions (x = 0, 0.04, 0.06, 0.08, 0.12, and 0.18) synthesized via conventional solid state reaction method exhibit piezoelectric coefficients comparable to those of “hard” PZT-8, PZT-4, and even “soft” PZT-5 A. Doping also improves the poling efficiency of xBaZrO3-(1−x)BaTiO3 ceramics. Stud…
Abstract In this study, the relationship between wood cellulose crystallinity, influence of extractives on wood degradation, correlation between chemical composition, and physical properties of four wood species were investigated by chemical analysis, Fourier transform infrared (FTIR) spectroscopy, and thermogravimetr…
We demonstrate for 24 metal oxide (MOx) nanoparticles that it is possible to use conduction band energy levels to delineate their toxicological potential at cellular and whole animal levels. Among the materials, the overlap of conduction band energy (E(c)) levels with the cellular redox potential (-4.12 to -4.84 eV) w…
The heat capacity of a strontium tetraborate (SrB 4 O 7 ) single crystal has been determined in the temperature range 55–300 K by adiabatic calorimetry, and its Debye characteristic temperature, entropy change, enthalpy increment, and phonon mean free path have been calculated as functions of temperature.
Abstract This article proposed a new high‐Q L resonator with a combination of a double spiral resonator and single split ring resonator with μ‐ near zero metamaterial.It is applied to the design of an X‐band oscillator. A very low phase noise for the oscillator can be obtained due to its sharp band‐ rejection characte…
Abstract The microwave reflection loss (RL) of four series of synthesized ferrites, Ba 0.5 Sr 0.5 Co x Zr x Fe (12 − 2x) O 19 and Ba 0.5 Sr 0.5 Co x Ti x Fe (12 − 2x) O 19 , have been measured using network analyzer in the frequency range from 8.2 to 12.4 GHz. The comprehensive analysis of RL is carried out as a funct…
This paper examines the growth of aligned ZnO nanorod arrays through chemical deposition from solution and the vapor phase. The nanorod alignment is ensured primarily by a thin layer of seeds—zinc oxide nanoparticles produced by decomposing zinc acetate directly on the substrate and aligned with their c axes normal to…
We have studied the cation distribution over the tetrahedral and octahedral sites in the spinel structure of nanocrystalline Ni x Zn1 − x Fe2O4 ferrites prepared by spray pyrolysis. 57Fe Mössbauer spectroscopy data for the ferrites demonstrate that, depending on the composition of the materials, the tetrahedral site m…
Abstract Surfactant EOR is an attractive method to recover the residual oil left behind in the reservoir after water flooding. The formulation of an effective surfactant system is a relatively complex and often time consuming process because the surfactant activity depends on the crude oil composition and the surfacta…
The transesterification of methyl acetate and 1-hexanol catalyzed by the cation exchange resin Amberlyst-131 was studied to obtain optimum operating parameters, adsorption parameters, and kinetic parameters. The effects of temperature, molar ratio of ester to alcohol, stirrer speed, and catalyst loading on the reactio…
We report here for the first time the isolation and characterization of a protein from the organic matrix (OM) of the sclerites of the alcyonarian, Corallium rubrum. This protein named scleritin is one of the predominant proteins extracted from the EDTA-soluble fraction of the OM. The entire open reading frame (ORF) w…
The aggregation of CuS nanoparticles during synthesis by a hassle-free aqueous route under microwave irradiation gave remarkable spherical shape, utilizing Cu(CH 3 COO) 2 ·H 2 O as the source of copper and Na 2 S 2 O 3 ·5H 2 O, as sulfur source; these materials were used without assistance of any surfactant or templat…
Single-wall carbon nanotubes (SWCNTs) are fluorinated around 200 °C with molecular fluorine (F 2 ) and xenon difluoride (XeF 2 ) as fluorination agents. In this latter case, fluorination is carried out by atomic fluorine F • generated by the thermal decomposition of gaseous XeF 2 on the nanotube surface. XeF 2 treatme…
Abstract Viscous C/W foams were generated without the use of polymers or surfactants by shearing CO2 and an aqueous phase containing partially hydrophobic silica nanoparticles in a beadpack filled with 180μm glass beads. Silica particles with 50% SiOH coverage were chosen because they have a hydrophilicity that falls…