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 variety of pyridinium and benzothiazolium-substituted conjugated donor-π-acceptor dipoles are studied by hyper- Rayleigh scattering (HRS) in solution. We have investigated their potential as strong electron acceptor moiety and a complete series has been synthesized and characterized. An elongation of the conjugat…
Deformation structures produced by high pressure torsion (HPT) and accumulative roll-bonding (ARB) were characterized by transmission electron microscopy and electron backscatter diffraction, and the mechanical properties of the ARB samples were determined by uniaxial tensile testing. The structural evolution during H…
Crystal structure and magnetization behavior of double perovskite compounds Sr 2 FeMo 1− x O 6 ( x = 0, 0.03, 0.04, 0.06) have been investigated using x-ray diffraction, Mössbauer spectroscopy and magnetization measurements. The proportion of Fe/Mo and the concentration of Mo vacancies determined by Rietveld methods a…
The comprehensive computer simulation study of the phase diagram of the repulsive step potential system in three dimensions is represented. We show that the system with a simple purely repulsive isotropic potential demonstrates a number of unusual features. The maxima and minima on the melting curve are found for some…
Reaction of disperse ultrananocrystalline diamond (UNCD) and mixtures of UNCD containing 10%–20% nanoboron carbide (B4C) with methane gas at temperatures near 1200K results in mechanically rigid compacts called nanocarbon ensembles (NCE) and boron-doped NCE, respectively. Seebeck coefficient and electrical conductivit…
A giant magnetoresistance (GMR) is observed in the Mn 2− x Zn x Sb ( x < 0.3) system, with the largest MR ratio of −37.6% in a field of 5 T at 120 K for the Mn 1.9 Zn 0.1 Sb compound. Different from other Mn 2 Sb-based compounds, the GMR in Mn 2− x Zn x Sb is closely correlated with a field-induced transition from a w…
Full-potential linearized augmented plane wave and local orbital method calculations were performed for Fe 2 TiSn in order to investigate the optical properties and to show the origin of the different optical transitions. It is found that the band gap is indirect for Fe 2 TiSn. Then our calculated reflectivity spectra…
In this work, we introduce the idea of cage formation probability, defined by considering the angular space needed by a particle in order to leave a cage given an average distance to its neighbors. Considering extreme fluctuations, two phases appear as a function of the number of neighbors and their distances to a cen…
We prepared K+-, Mg2+-, and Y3+-doped Ni–Ti–O polycrystalline ceramics by chemical synthesis combined with a traditional ceramic processing. Analysis of the microstructure and phase composition reveals that a core/shell structure can be observed and NiTiO3 phase exists as the grain boundary. Our results indicate that…
[Abstract] Increasing demands on composite technology necessitate structural materials possessing both great ductility and extreme strength. To fully understand the mechanical behavior of 3-D textile composites, it is essential to perform analyses such as prediction of effective material properties and characterizatio…
This paper systematically studies the electrospinning and characteristics of Nylon-66 polymer nanofiber fabrics that were electrospun at two different collector drum speeds of 1.5 m/s and 3.0 m/s. It also evaluates the potential for producing nanofiber fabrics with uniform thickness using single-nozzle and multiple-no…
This project is a feasibility study to control a wing flap using shape memory alloy (SMA). Two key issues were addressed: (1) how to use SMA to effectively actuate the wing flap and (2) how to improve the actuation frequency once the initial conceptual design proves to be feasible. The 1 task involves the conceptual d…
Plasma gas temperatures were measured via in situ optical emission spectroscopy in a microwave CH 4 –H 2 plasma under carbon nanotube (CNT) growth conditions. Gas temperature is an important parameter in controlling and optimizing CNT growth. The temperature has a significant impact on chemical kinetic rates, species…
Severe plastic deformation (SPD) has been demonstrated to be the most efficient method to produce bulk metals with ultrafine grained (UFG, 100 nm < grain size d < 500 nm) and nanocrystalline (NC, d<100 nm) microstructures. Such metals exhibit some unique properties owing to their unusual microstructures such…
A coupled cellular automaton-finite difference (CA-FD) model is used to simulate the detailed dendritic structure evolution of the columnar-to-equiaxed transition (CET) for Al-Cu alloys during solidification. The effects of material properties (nucleation undercooling, density of nuclei in bulk liquid and alloy solidi…
Abstract A two‐step process has been invented to prepare sulfonated polypropylene from chlorinated polypropylene via thiolation and successive oxidation to enhance the dyeability of polypropylene. With a short thiolation reaction time of 3 h in an N ‐methyl‐2‐pyrrolidone solution, 1.7–20.5% sulfur can be incorporated…
We report on a novel and facile thermal chemical vapour deposition method for fabricating dense and vertically well-aligned bamboo-like carbon nanotube (CNT) arrays on a copper substrate from ethanol and acetone for the first time. The effect of growth time, temperature and catalysts has been systematically studied. U…
Electrical and thermal properties of hybrid advanced composites containing aligned carbon nanotubes (CNTs) are studied experimentally. In situ growth of aligned CNTs on the surface of woven alumina fiber cloth, followed by wetting with a thermoset epoxy, allows CNTs to be distributed throughout the laminate and formin…
Te-free environmental friendly Si x Sb 100− x phase-change materials are investigated. The binary material, which is compatible with the complementary metal-oxide-semiconductor manufacturing process, is outstanding in various properties. Si x Sb 100− x shows a much better data retention as compared with Ge 2 Sb 2 Te 5…
Nd3+:(La1−x,Bax)F3−x(x=0.1) is efficiently grown by the micro-pulling-down method. Characterization of its optical properties reveals that it is transparent in the vacuum ultraviolet region with an absorption edge at around 180 nm. It has fluorescence centered at 175 nm with a bandwidth of 12 nm and a lifetime of 6.1…