Materials Literature
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A homology model of human choline kinase (CK-alpha) based on the X-ray crystallographic structure of C. elegans choline kinase (CKA-2) is presented. Molecular dynamics simulations performed on CK-alpha confirm the quality of the model, and also support the putative ATP and choline binding sites. A good correlation bet…
A combination of energetic shake-milling and a subsequent double sintering process was employed to synthesize Co0.8Zn1.2Z (Ba3Co0.8Zn1.2Fe24O41) hexaferrite nanoparticles with a high-saturation magnetization and a low coercivity. A homogeneous mixture of BaCO3, CoO, ZnO, 40-nm sized alpha-Fe2O3, and heat-treating in a…
We have prepared ultrathin, nanostructured melanin films on Au(111) by means of electrochemical self-assembly. These films were characterized by using Auger electron spectroscopy, X-ray absorption near-edge structure spectroscopy, scanning tunneling microscopy, magnetic force microscopy, and electrochemical techniques…
In this paper, we report on the growth of BaFe$_12$O$_19$(BaM) thick films on sapphire Al$_2$O$_3$(0001) substrate. Our goal is to fabricate barium ferrite thick films which can be self-biased for circulator applications. We have modified the liquid phase epitaxy (LPE) method by conducting the experiment in vacuum. A…
This paper establishes a comparison between the interface exhibited by an archaeological bronze alloy when previously submitted to a burial environment and a chloride electrolyte. The SEM-EDAX analysis shows that the archaeological surface exhibited a three layered structure characterized by a tin enrichment at the in…
The crystal-melt interfacial free energies of different crystal orientations and crystal forms for the hard-dumbbell systems have been calculated directly using a multistep thermodynamic perturbation method via nonequilibrium work measurements with a cleaving procedure. We found that for the plastic crystal phase, the…
This paper analyzes the performances of an embedded closed-loop control system with a compensated magnetostrictive actuator (e.g., a Terfenol-D based device) for micropositioning tasks. The control system and the compensation algorithm are implemented, as a standalone application, on a microcontroller. The embedded ap…
Abstract A unique tubular structure for mercury telluride HgTe grown inside narrow single walled carbon nanotubes (SWNTs) is described with both Hg and Te in novel coordination geometries. Two unique projections were obtained by high resolution transmission electron microscopy from two separate encapsulated crystal fr…
Melting of a finite size binary system consisting of two types of particles having different charges and/or masses, confined in a two-dimensional (2D) parabolic trap, is studied. The melting temperature is obtained for different values of the ratio between the charges and/or masses of the two types of particles. The t…
This paper reports first on the very promising self-heating and temperature rising characteristics of solid-state NiFe$_2$O$_4$nanoparticles for hyperthermia applications. NiFe$_2$O$_4$nanoparticles were prepared by using both the “high temperature thermal decomposition method (HTTD)” and the “newly modified sol-gel”…
Thermal stability of well-crystallized cubic boron nitride (cBN) films grown by chemical vapor deposition has been investigated by cathodoluminescence (CL), Raman spectroscopy, and scanning electron microscopy (SEM) with the cBN films annealed at various temperatures up to 1,300 degrees C. The crystallinity of the cBN…
High chromium martensitic steels are designed to provide high corrosion resistance in combination with high strength. Some of these steel grades contain primary carbides for improving the wear resistance, e.g. the steel 440C. The present paper mainly deals with the effect of chemical composition and microstructure on…
Surface-enhanced Raman scattering has been applied to study weak intermolecular interactions between small organic gelling molecules involved in the silver nanoparticle-hydrogel composite formation. Assembly and disassembly of the gelator molecules in close vicinity to embedded silver nanoparticles were followed by ch…
M-type barium hexaferrite films were processed by pulsed laser deposition on single-crystal 6-H silicon carbide substrates. MgO buffer and barrier layers were introduced to improve the film quality. Samples were characterized by X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, X…
We studied the transport, magnetic, and structural properties of spinel ${\mathrm{MnTi}}_{2}{\mathrm{O}}_{4}$ and V-doped samples, ${\mathrm{MnTi}}_{2\ensuremath{-}x}{\mathrm{V}}_{x}{\mathrm{O}}_{4}$, to clarify the relation between charge, spin, and orbital degrees of freedom of $3d$ electrons in this series of compo…
A study of the magnetostructural phase transition and related magnetic entropy changes, DeltaSM, in the vicinity of a first-order magnetostructural transition, in polycrystalline shape memory alloys Ni2+xMn1-xGa (x=0.16,0.17,0.18,0.19,0.20) have been done. Thermal expansion measurements reveal the gradual overlap of t…
The optical properties of 0.65Pb(Mg 1/3 Nb 2/3 )O 3 –0.35PbTiO 3 (PMN–0.35PT) single crystals were investigated by means of the optical transmittance spectrum. The refractive indices were measured in the visible region, and the dispersion behaviours of ordinary and extraordinary lights were well described in terms of…
The synthesis, structure, EPR, and magnetic studies of two dodecanuclear heterometallic cyclic clusters are reported. The compounds have the general formula [R(2)NH(2)](2)[Cr(10)Cu(2)F(14)(O(2)CCMe(3))(22)] (R=Me, 1 or iPr, 2). Both structures contain an array of metal centers which describe an approximate "hourglass"…
This paper presents the rotational power loss P, curves measured for nonoriented, conventional grain-oriented and high-permeability grain-oriented electrical steel under controlled loci of flux density B, or magnetic field H. The P is measured at 10, 50, and 250 Hz with the radius of circular loci of B being controlle…
Polyhedral oligomeric silsesquioxanes epoxy resin (POSSER) was prepared from 3-glycidypropyl-trimethoxysilane (GTMS) and tetramethylammonium hydroxide (TMAH) by hydrolytic condensation. POSSER was characterized using Fourier-transformed infrared spectroscopy (FTIR), 1H-NMR, and liquid chromagraphy/mass spectrometry (L…