Materials Literature
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The compounds alpha-RE2B4O9, with RE = Sm (disamarium tetraborate) and Ho (diholmium tetraborate), were synthesized under conditions of high pressure and high temperature in a Walker-type multianvil apparatus, at 7.5 GPa and 1323 K for alpha-Sm2B4O9 and at 10 GPa and 1323 K for alpha-Ho2B4O9. The crystal structures we…
In this paper, we present and thoroughly characterize several new models of amorphous binary IV-VI glasses. We apply both a quench from the melt simulation regime and a scheme based on decoration of tetrahedral amorphous networks. We show that for certain binary IV-VI glasses (especially silica), decoration of bond-ce…
A potent crystallization strategy for the synthesis of homogeneous calcite crystals in a variety of morphological forms (see picture) from solutions containing Mg ions and using self-assembled monolayers as nucleation templates is reported. The approach is based on a new phenomenon – template-dependant crystal morphog…
We derive a dynamic field theory for a kinetically constrained model, based on the Fredrickson-Andersen model, which we expect to describe the properties of an Arrhenius (strong) supercooled liquid at the coarse-grained level. We study this field theory using the renormalization group. For mesoscopic length and time s…
We present a method for making highly ordered arrays of Ni nanowire (NW) tips fully exposed over the surface of anodic aluminum oxide (AAO) templates with uniform exposed lengths. Ni NWs are electrochemically deposited in the nanochannels of the AAO templates, and the templates surface is selectively etched to expose…
White-light and blue-green electroluminescence (EL) of a multirecipe Si-ion-implanted SiO/sub 2/ (SiO/sub 2/:Si/sup +/) film on Si substrate are demonstrated. The blue-green photoluminescence (PL) is enhanced by the reaction of O/sub 3//spl equiv/Si-O-Si/spl equiv/O/sub 3//spl rarr/O/sub 3//spl equiv/Si-Si/spl equiv/O…
This contribution reports on the investigations of partial discharge (PD) and dissipation factor measurements as function of the applied test voltage to evaluate the actual status of insulation system for high voltage rotating machines due to thermomechanical stress. As test object actual stator bars were used, based…
Abstract A new method is described to prepare composites of poly[(butylene succinate)‐ co ‐(butylene adipate)] (PBSA) with an organophilic clay having a particular functional group, namely twice‐functionalized organoclay (TFC). TFCs were produced by treating Cloisite 25A ® with (glycidyloxypropyl)trimethoxy silane (GP…
A novel flame retardant (4-diphenylphosphoryloxyphenoxy)(4-hydroxyphenoxy)cyclotriphosphazene (PPPZ) was prepared and characterized by FT-IR, 31P-NMR and 1H-NMR spectroscopy. Polyurethanes that contained aromatic phosphate groups attached to cyclotriphosphazene, with various phosphorus contents, were prepared from PPP…
Abstract Summary: The degradation behaviour of a flexible epoxy/amine resin has been studied. The resin, made of DGEBA and polyether diamine (Jeffamine® D2000) has been submitted to photooxidation, photolysis (in absence of oxygen) and thermooxidation experiments. The nature and the mechanism of formation of the produ…
Three-dimensional (3D) ZnO hybrid structure was fabricated by growing a ZnO buffer layer, a ZnO nanowire array, and a ZnO film continuously through the control of supersaturation conditions. Lower and upper ends of vertically aligned nanowires in this hybrid structure formed seamless interfacial contacts with the buff…
Using a synchrotron radiation source and a diamond anvil cell, we measured the pressure dependence of the lattice parameters of a polycrystalline Ti4AlN3 sample up to a pressure of 55 GPa. No phase transformations were observed. As observed in Ti3SiC2,Ti3Si0.5Ge0.5C2, and Zr2InC, the compressibility of Ti4AlN3 along t…
A continuum model yielding dispersion relations for long-wavelength acoustic and optical phonons in two-dimensional graphite and achiral single-walled carbon nanotubes is developed. Close relations with the theory of thin elastic plates and cylindrical shells are established. The effective thickness of a nanotube dete…
Highly ordered cadmium sulphide (CdS) nanoparticle (NP) arrays were fabricated on silicon (Si) substrates using ultrathin alumina membranes as evaporation masks. The CdS NPs are polycrystalline and are composed of ultrasmall closely packed nanocrystallites. These crystallites increase in size as the duration of the Cd…
Raman active phonon frequencies and corresponding vibrational eigenmodes are reported for two M2AlC ceramics, Ti2AlC and Cr2AlC, by means of first-principles calculations. The theoretical modes are approved by the experimental Raman spectrum for Ti2AlC. Compared with that of the Ti3SiC2 counterpart, the number of Rama…
Abstract A new analytical form for bond and angle potentials suitable for obtaining mesoscale effective force fields from target distributions is reported. Applications to realistic coarse‐grained models of atactic polystyrene and polyamide‐6,6 are described. The potential optimization procedure, despite its simplicit…
In this work, a photothermal experiment is designed and conducted to characterize the thermal transport in carbon nanotubes (CNTs) along the axial direction exclusively. We characterize the thermal contact resistance between CNTs and the substrate. The measured value demonstrates a sound thermal contact between them.…
A promising generation of extremely low frequency magnetic field sensors, based on multilayer composites (MLCs) of magnetostrictive Terfenol-D (Tb1−xDyxFe2−y) and piezoelectric Pb(Mg1∕3Nb2∕3)O3–PbTiO3, has been developed. Our MLC magnetoelectric sensor presently shows a limit in (i) working frequency of ∼5×10−3Hz; and…
We demonstrate that carefully prepared (Ga,Mn)As films can show large magnetic moments per atom across a wide range of Mn concentrations, indicating almost full participation of the Mn in the ferromagnetism. Applying sum rules to Mn ${L}_{2,3}$ x-ray magnetic circular dichroism (XMCD) spectra yields a magnetic moment…
The electronic structure of the rhombohedral $\mathrm{La}\mathrm{Co}{\mathrm{O}}_{3}$ perovskite is calculated for a number of structures with varying $\mathrm{Co}{\mathrm{O}}_{6}$ octahedra geometry. The calculations are based on the generalized gradient approximation (GGA) to the density functional theory and, in or…