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 mathematical crystallization model in the meso scale (the intermediate dimension scale between interatomic distance in solids and grain size in metals and alloys) is presented with the use of a kinetic-diffusion cellular automaton model. The model considers the non-equilibrium character of real processes of phase tr…
We introduce a method for the determination of the optical retardation, its wavelength dispersion, the cell twist angle, and the orientation of the input director in a reflective liquid crystal (LC) cell. These parameters are found from the extremes of a characteristic function defined as a sum of two spectral reflect…
If colloidal particles are grafted with a polymer, then the grafted chains can provide steric repulsion between them. If some of the grafted polymer chains are also adsorbed to a second particle, then a bridging force is generated as well. For uncharged plates and polymer, the following contributions to the free energ…
A method to prepare a new class of helicene-fused phthalocyanine derivatives is outlined. These derivatives self-assemble into unique rod-like features, with a narrow length distribution of 750-850 nm and a uniform width of 95 ± 10 nm .
Abstract Sulfur vulcanization was carried out with 5-phenyl hex-2-ene serving as a model of e-SBR. Various accelerators have been used to study and compare the reactivity in a system containing sulfur and activators. Both HPLC and GC-MS analytical tools were used to identify the reaction products. It has been observed…
Odd–even behavior for the emergence of ferroelectricity and antiferroelectricity has been examined in bent-core compounds containing two different chain lengths; i.e., 1:1 mixtures of neighboring homologues of symmetric bent-core mesogens and nonsymmetric pure compounds. The odd–even behavior was found to be very stri…
Specific features of electrode behavior of synthetic diamond and diamond-based materials (in particular, diamond-nondiamond carbon nanocomposites, nanocrystalline diamond, and diamond-like carbon) are reviewed. Effects of the crystal structure and semiconductor nature of diamond on its electrochemical properties are d…
Novel gold nanoparticles, passivated by monolayers of benzenethiol, biphenylthiol, and similar derivatives, have been synthesized and characterized using UV/vis, NMR, and Fourier transform infrared (FTIR) spectroscopies. The nanoparticle sizes have been evaluated using transmission electron microscopy and UV/vis spect…
A new class of linear unsaturated polyarylphosphate esters based on dibenzylidene cyclopentanone, possessing liquid crystalline‐cum‐photocrosslinkable properties has been synthesized from 2,5‐bis(m‐hydroxyalkyloxybenzylidene)cyclopentanone (m = 6,8,10) with various aryl phosphorodichloridates (aryl = phenyl, naphthyl,…
In situ and ex‐situ atomic force microscopy (AFM) studies of annealing of solution‐grown single crystals of polyethylene (PE) on graphite were performed at temperatures up to 170°C. Structural changes of the crystals began at ∼90°C at the interface between the lamellar crystal and the substrate where solvent traces ar…
The effect of initial synthesis solution pH and tetramethylammonium silicate concentration in the synthesis solution on the physical and chemical properties of MCM-41 was systematically investigated using N(2) physisorption, X-ray diffraction, temperature-programmed reduction, in situ Fourier transform IR, UV-vis, and…
The corrosion behaviour of Nd–Fe–B, a permanent magnetic alloy, has been studied in two different solutions chosen to simulate the effects of marine and industrial environments. The results showed that the corrosion rate of the alloy was about nine times higher in the simulated industrial (sulphate) environment when c…
Abstract Cellular biological materials have intricate interior structures, self‐organised in hierarchies to produce modularity, redundancy and differentiation. As Michael Weinstock explains, the foam geometries of cellular materials offer open and ductile structural systems that are strong and permeable, making them a…
Este trabalho avalia a viabilidade técnica da obtenção de compósitos lignocelulósicos de PVC, utilizando-se resíduo de Pinus elliottii e Pinus taeda como carga reforçativa. Foi desenvolvido um processo simples e economicamente viável de tratamento de resíduos industriais desta madeira, processo este baseado na secagem…
The nonempirical density-functional tight-binding approach to band structure calculations was used to study the structural and electronic properties of new boron nitride graphyne-like nanotubes (α-BN-NT) constructed on the basis of the atomic motif of α-graphyne. All α-BN tubes were semiconductors with gap widths of 3…
Abstract Single crystals of bulk ZnO containing up to about 3% of Mn or Co were grown by chemical vapour transport method and characterized by Raman scattering. By comparison with Raman data taken on pure ZnO samples, a few new structures were observed in the spectra of the doped crystals. The determined frequencies o…
Bulk Cu with high strength and appreciable tensile ductility has been developed by refining the grain size down to nanocrystalline/ultrafine‐range by appropriate combination of conventional rolling at cryogenic condition and controlled recrystallization. The grain size has been estimated at different stages of deforma…
A series of melt blown samples were produced from three hardness grades of ether based thermoplastic polyurethane elastomers (TPU). The fabrics were tested to investigate their structure-property relationship in a melt blown process. Solution viscosities of the web were only 20–26% of there original values indicating…
The effect of uniaxial orientational drawing and isometric annealing on the ratio of polymorphic modifications in the crystalline phase of poly(vinylidene fluoride) is studied. The role of drawing temperature and draw ratio in the structural rearrangements during polymer deformation is analyzed. The conditions providi…
A novel ceramic-metal composite with continuous interconnected ceramic and metal phases has been fabricated from sintered porous particulate AlN preforms infiltrated with magnesium. The 48 vol. % AlN composites are fabricated by pressureless infiltration in argon in the temperature range of 870 °C to 960 °C. An increa…