Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A circular braiding machine can be used to produce complex shapes by overbraiding a contoured mandrel and adjusting the process parameters. To simplify the design process and advance this technology, a CAD model is developed to describe the geometry of a 3D circular braid both externally and internally. A quadrilatera…
It has been found that the rate of Si etching by hydrazine (N 2 H 4 H 2 O) is drastically retarded by ion-beam exposure. By utilizing this new phenomenon, a simple process of fabricating nanopyramid arrays (NPAs) on a Si surface is proposed. Two-dimensional arrays of dots and lines are written directly on a Si substra…
Mass loss and thermometric methods have been used to study the inhibition of aluminium corrosion in HCl solution by four Schiff bases: 2-anisalidine-pyridine; 2-anisalidine-pyrimidine; 2-salicylidine-pyridine; and 2-salicylidine-pyrimidine. Values of inhibition efficiency obtained from the two methods are in good agre…
The temperature rise produced in iron and copper specimens by high strain deformation in a compression split Hopkinson pressure bar was measured simultaneously using two independent techniques: (i) small thermocouples (0.2 mm junction size) and (ii) an infrared (IR) camera system based on mercury cadmium telluride (sp…
A Huber G670 imaging-plate Guinier powder diffraction camera has been tested at an X-ray synchrotron source. It was found to be a very potent tool, offering an unusual combination of high angular resolution and short data collection time, while using very small amounts of sample. Specifically, it was found that: (i) t…
Lawsonite crystals have been investigated by dilatometry and dynamic mechanical analysis as well as by measurements of the optical birefringence and the dielectric constant in the temperature range 90K ≤T ≤ 633K. Two successive phase transitions have been found at low temperatures. The analysis of the spontaneous stra…
Local deposition of copper on aluminum was attempted by the successive processes of anodizing, laser irradiation, and electroless plating. Aluminum specimens covered with anodic oxide films were immersed in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="ML1" overflow="scroll"> <mml:msup>…
The effect of atmospheric conditions on the water vapour permeability characteristics of waterproof breathable fabrics has been studied. Several types of waterproof breathable fabrics were tested for vapour permeability under a wide range of atmospheric temperatures and relative humidities. It was found that atmospher…
Abstract The objective of this review is to provide a working knowledge of the chemistry of silicone compounds to the practicing chemist. Although silicone compounds have been known for over 50 yr, the chemistry of these materials remains elusive to the average formulating chemist. This is indeed unfortunate, since th…
Synthetic Cs(VO2)3(TeO3)2 is built up from infinite sheets of distorted octahedral VVO6 groups, sharing vertices. These octahedral layers are “capped” by Te atoms (as parts of pyramidal [TeIVO3]2– groups) on both faces of each V/O sheet, with inter-layer, 12-coordinate, Cs+ cations providing charge compensation. Cs(VO…
The α‐ and β‐SiAlONs are ceramic solid solutions with charge‐neutral substitutions in α‐ and β‐Si 3 N 4 . They have high potential for applications as structural materials. We have calculated the electronic structure and bonding of β‐Si 6— z Al z O z N 8— z for z = 0, 1, 2, 3, 4 using a first‐principles method. Total…
The crystal structures at room (296 K) and low (173 K) temperature of several alpha-alums have been refined by single-crystal X-ray structure analysis. Many alpha-alums of known structure are disordered, the sulfate anions occupying one of two possible sites. All those studied here exhibited such disorder and the rela…
The mechanisms of failure of symmetrical tilt boundaries have been investigated using an atomistic technique. The fracture process advances in steps that are related to the structural unit of the symmetrical tilt grain boundary. These boundaries are shown to fail through a combined mechanism involving dislocation emis…
Abstract The distribution and crystal-chemical characteristics of chlorite, corrensite, and mica in samples from a stratigraphic profile in the Cameros basin are controlled by changes in the sedimentary facies. The lacustrine marls and limestones from the base and the top of the profile contain quartz + calcite + illi…
Transparent strontium titanate thin films were prepared on fused silica substrate by spin-on sol–gel process using strontium 2-ethyl hexanoate and titanium isopropoxide as precursors in ethanol medium. The lattice constants of crystalline films were a = b = c =3.91 Å. Optical constants of the films in amorphous and po…
Colloidal mineralogy is one of the main characteristics of the steady state reached in developed soils. Surface charge and other chemical and physical properties of the soil depend on colloidal mineralogy. It is, therefore, very important to further investigate the clay mineralogy of acidic variable charge subsoils in…
Novel bio-/organic-inorganic hybrid compounds of deoxyribonucleic acid (DNA) and methotrexate (MTX)-layered double hydroxide are prepared by ion-exchange type intercalation reaction. The layered inorganic support. Mg2Al(NO3)-LDH, is at first obtained by coprecipitation in an aqueous solution, and then the interlayer N…
Abstract Degradation behavior of poly(vinyl chloride) (PVC) was analyzed by means of simultaneous thermogravimetry-mass spectrometry (TG-MS). Weight loss and the production behavior of hydrogen chloride and organic materials with PVC degradation was clearly divided into three stages at lower heating rate. Dehydrochlor…
A number of fused silica samples were evaluated for their resistance to densification by deep UV radiation at 193 nm wavelength. Density changes for all the samples equal the product of a material dependent constant and the absorbed two-photon dose to a sublinear power of about 2/3. This dose dependence is consistent…
Living free-radical bulk polymerization using a stable free radical initiator system based on nitroxide stable radicals such as TEMPO (2,2,6,6,-tetramethyl-1-piperidynyloxy) has permitted the synthesis of polymers with molecular weight distributions only slightly broader than those obtained via anionic polymerization…