Materials Literature
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Abstract Monodispersed zinc oxide (ZnO) whiskers with different aspect ratios were successfully prepared via a simple solution route at low temperature. It is found that the diameter and aspect ratio of ZnO whiskers depend critically on the structure and type of ionic surfactant added in the reaction solution. To furt…
The pressure ($p$) -- temperature ($T$) phase diagram for microscopic magnetism in the multiferroic compound HoMn$_{2}$O$_{5}$ was established using neutron diffraction measurements under a hydrostatic pressure up to 1.25 GPa. At ambient pressure, incommensurate--commensurate--incommensurate magnetic phase transitions…
We carried out chymotryptic digestion of multimeric ATP-dependent Lon protease from Escherichia coli. Four regions sensitive to proteolytic digestion were located in the enzyme and several fragments corresponding to the individual structural domains of the enzyme or their combinations were isolated. It was shown that…
The scanning electron microscopy-based electron backscatter diffraction technique has been used to determine grain orientations of abnormally grown grains upon annealing in nanocrystalline Ni and Ni-20 at.% Fe electrodeposits. The results show that in nanocrystalline Ni and Ni-Fe, the first grown grains that can be de…
The optimization of magnetic and physical properties of electrical steel is imperative for many engineering applications. The key factors to improve magnetic properties are the steel composition as well as control of the crystallographic orientation and microstructure of the steel during processing. However, this requ…
The effect of ultraviolet (UV) photon assisted annealing on the structural, dielectric, and insulating properties of barium strontium titanate (BST) thin films was investigated. Isothermal-temporal annealing experiments revealed that the films annealed utilizing UV assist possessed enhanced crystallization and lattice…
Abstract We present an analytical device model for a graphene field‐effect transistor (GFET) on a highly conducting substrate, playing the role of the back gate, with relatively short top gate which controls the source–drain current The equations of the GFET device model include the Poisson equation in the weak nonloc…
The photovoltaic properties of Si∕SiO2 multiple quantum wells (QWs) embedded in lateral Schottky contacts are investigated. The QWs were fabricated by remote plasma enhanced chemical vapor deposition. By subsequent rapid thermal annealing, the two-dimensional Si layers are partially recrystallized, which gives rise to…
Abstract Chlorine‐doped ZnO thin films were grown by MOCVD on sapphire and fused silica. Chlorine is incorporated in substitution for oxygen and acts as a donor, leading to an increase of electron concentration. Transport properties were studied for samples with different chlorine content. Hall effect measurements sho…
In situ electron backscatter diffraction microstructural analysis of recrystallizing interstitial free steels deformed to strains of 0.75 and 1.6 has been carried out in a FEG-SEM. The experimental procedures are discussed, and it is shown that there is no degradation of the electron backscatter diffraction patterns a…
A contribution is made to the study of the negative difference effect (NDE) for AZ91 corroding in 1N NaCl. The volume of evolved hydrogen, the weight loss and the mass of Mg2+ ions was measured for applied current densities from 0 to 6 mA/cm2. The experimental results agreed with the standard model of Mg corrosion inv…
Engineering quantum dots (QDs) with a paramagnetic nitroxide radical tail yields a weakly fluorescent spin-labeled QD conjugate. Quenching of the intrinsic fluorescence of the QDs results from electron transfer between the QDs and nitroxide radical. Interestingly, when the paramagnetic properties of the nitroxide moie…
Abstract We report investigation of electrical conductivity of high resistivity polystyrene/carbon nanotube composites. The films consisted of a thiol‐bonded network of wrapped MWNTs within a polystyrene matrix with mass ratios ranging from 0% to 1%. The electrical conductivity and its thermal activation energy were s…
A lithographic process based on focused ion beam bombardment is developed for selectively closing and opening nanochannels on a porous anodic alumina film. This resist-free process is based on the use of focused ion beams with different energies that strike a balance between material sputtering and material relocation…
Abstract The thermoelectric properties of n‐type Mg 2 Si 0.6– y Sb y Sn 0.4 solid solutions with a small Sb‐doping ratio on the Si‐site ( y = 0.0–0.015) were prepared by an induction melting/hot‐pressing method. The electrical conductivity, Seebeck coefficient and thermal conductivity have been measured as a function…
The A -site-ordered perovskites A Cu 3 V 4 O 12 ( A = Na + , Ca 2+ , and Y 3+ ) have been found to be Pauli paramagnetic metals. Bond valence sum calculations, magnetic susceptibility measurement, and electronic structure calculations reveal that both Cu and V orbitals contribute to the metallic conduction. Changing t…
In situ electrical transport measurements on individual bent ZnO nanowires have been performed inside a high-resolution transmission electron microscope, where the crystal structures of ZnO nanowires were simultaneously imaged. A series of consecutively recorded current-voltage (I-V) curves along with an increase in n…
Abstract Well‐shaped yellow to red transparent single crystals of the phosphide oxides RE ZnPO ( RE = Y, La–Nd, Sm, Gd, Dy, Ho) were synthesized from the elements and ZnO in NaCl/KCl fluxes in sealed silica ampoules. Four structures (NdZnPO type, R 3 m ) were refined from single crystal X‐ray diffractometer data: a =…
There are several 3-D analytical models available for predicting the permeability of fibrous media. These models are developed based on the assumption that the medium is homogeneous with fibers oriented either in one specific direction, randomly oriented in the plane of the material, or isotropically oriented in a 3-D…
A phenomenon of negative refraction of dipole-exchange spin waves (DESWs) was demonstrated by micromagnetic modeling, based on the fact that the DESWs’ dispersion is anisotropic according to the relative orientation of the DESW propagation direction with respect to the orientation of local static magnetizations. Using…