Materials Literature
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The aim of this work is to investigate the microstructure development of cerium oxide nanocrystal, prepared by the microemulsion process, as a function of annealing temperature in air. Combined with the HRTEM and the thermogravimetric−differential thermal analysis (TG−DTA), the XRD patterns reveal that the sample anne…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFree-standing Single Crystal Silicon NanoribbonsWensheng Shi, Hongying Peng, Ning Wang, Chi Pui Li, Lu Xu, Chun Sing Lee, Rafi Kalish, and Shuit-Tong LeeView Author Information Center Of Super-Diamond and Advanced Films (COSDAF) and the Department of Physics and Materi…
The vortex-liquid and vortex-solid phases in single crystals of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ placed in tilted magnetic fields are studied by in-plane resistivity measurements using the Corbino geometry to avoid spurious surface barrier effects. It was found that the anisotropy of the vortex-solid phase increases with…
This paper focuses on mechanical aspects of chromatin biological functioning. Within a basic geometric modeling of the chromatin assembly, we give for the first time the complete set of elastic constants (twist and bend persistence lengths, stretch modulus and twist-stretch coupling constant) of the so-called 30-nm ch…
We demonstrate experimentally the electrical ballistic electron spin injection from a ferromagnetic metal / tunnel barrier contact into a semiconductor III-V heterostructure. We introduce the Oblique Hanle Effect technique for reliable optical measurement of the degree of injected spin polarization. In a CoFe / Al2O3…
A linear bubble model of grain growth is introduced to study the conditions under which an isolated grain can grow to a size much larger than the surrounding matrix average (abnormal growth). We first consider the case of bubbles of two different types such that the permeability of links joining unlike bubbles is larg…
Microbolometers respond to variations in impinging infrared energy through changes in the temperature of their thermally isolated detector structure. Thus, variations in the temperature of the substrate give rise to erroneous detector output variations. In order to minimize these effects, microbolometers are thermally…
A unit cell of a spinel ferrite is just under 1 nm, actually about 0.8 nm. Particles approaching this size can be expected to possess properties that differ from the bulk material. Bulk polycrystalline Zn-ferrite ( ZnFe 2 O 4 ) has been ball milled; after 50 h the average particle size is about 13 nm. The 57 Fe Mössba…
We have prepared (Sm-Co)/Co multilayers with two different Co thicknes to study the hard magnetic properties (coercivity H ci and energy product BH max ) of nanostructured SmCo magnets consisting of hard SmCo and softer higher moment Co phases. Samples are annealed at a temperature in the range 450 – 700°C, for 20 min…
Volume is indexed by Thomson Reuters CPCI-S (WoS).X-ray powder diffraction is a non-destructive technique widely applied for the characterisation of crystalline materials. The method has been traditionally used for phase identification, quantitative analysis and the determination of structure imperfections. In recent…
Thermopiles are uncooled, broadband detectors that require no chopper or temperature stabilizer. Their wide operating- temperature range, lack of temperature stabilization, and radiometric accuracy make thermopiles well suited for some space-based scientific imaging applications. These detectors may also offer advanta…
Abstract Mathematical models are proposed to predict degradation of unstabilized low density polyethylene (LDPE) films and those stabilized with hindered amine light stabilizers (HALS) under both thermo‐oxidation at 90°C and natural weathering conditions. The degradation was measured by change in percent elongation at…
Abstract The reactivity of cyclosiloxane with 3,3,4,4,5,5,6,6,6‐nonafluorohexyl group and its application to fluorosilicone synthesis were studied. In contrast to the polymerization of the commercially available 1,3,5‐tris(3,3,3‐trifluoropropyl)‐1,3,5‐trimethylcyclotrisiloxane (CF 3 –D3), the polymerization of 1,3,5‐t…
Abstract A disperse dyeable polypropylene fiber has been prepared by admixing polystyrene to the polymer prior to extrusion. Polystyrene has been synthesized at suitable molecule weight and narrow mol wt distribution. The dyeability, mechanical properties, shrinkage, degree of crystallinity, and orientation of pure po…
The transverse Hall resistivity, ${\ensuremath{\rho}}_{\mathrm{xy}},$ and magnetization, M, of [110] and [100] oriented epitaxial ${\mathrm{Nd}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ films with large magnetoresistance were measured as a function of temperature and applied magnetic field to study the ordinary and…
A novel strategy for preparing a wide range of substituted poly(aniline)s from a single precursor is described. This approach relies on a boron activation/electrophilic displacement reaction resulting in ipso-substitution. Specifically, we demonstrate this strategy to prepare a few of the many possible structures that…
Starting with β-formyl- and β,β′-diformylporphyrins, novel mono- and dipyrroloporphyrins were synthesised via 1,5-electrocyclization of porphyrinic azomethine ylides.
Ab initio molecular dynamics simulations are performed on small single wall nanotubes. By structural relaxation, the equilibrium C-C bond lengths and bond angles are determined. Our result shows that for both zigzag and armchair nanotubes there are two nonequivalent bond lengths. One bond stretches from that of the gr…
Single crystals of K 2 Te 4 O 9 ·3.2H 2 O, KGaTe 6 O 14, and KGaTe 2 O 6 ·1.8H 2 O have been synthesized by supercritical hydrothermal methods using KOH, TeO 2, and Ga 2 O 3 as reagents. K 2 Te 4 O 9 ·3.2H 2 O has a layered structure, whereas KGaTe 6 O 14 and KGaTe 2 O 6 ·1.8H 2 O have three-dimensional frameworks. In…
Abstract With trimesinic acid as a molecular weight regulator, the hydrolytic polymerization of ϵ‐caprolactam was carried out, and nylon‐6 or polyamide‐6 with three‐branched chains was obtained. Through a systematic study of the effects of conditions such as the reaction time and concentration of trimesinic acid on th…