Materials Literature
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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…
We report on an improvement of optoelectrical properties of poly(methoxy-ethylexyloxy-phenylenevinilene) (MEH-PPV) polymer by incorporation of boron doped freestanding silicon nanocrystals (Si-ncs). The photoluminescence (PL) behavior of blended Si-ncs could be assigned to quantum confinement of excitons in nanocrysta…
The electrical, optical, and phase change properties of bismuth doped Sb8Te2 films have been characterized. Thin films of the material, with up to 15at.% percent Bi, have been synthesized; amorphous films were stable at room temperature with a Bi concentration of up to 13at.%. The effect of Bi on the phase change prop…
[Abstract] Reinforced thermoplastic composites used for primary aircraft structures are subjected to thermal effects throughout theirs lives. That is why the understanding of the temperature impact on the mechanical properties of carbon fibre reinforced plastics is very important for the choice of the appropriate plas…
Lead lanthanum zirconate titanate (PLZT) ceramics were synthesized using a high energy mechanochemical processing technique, using tungsten carbide grinding vials and balls. The ceramic powders were prepared using the constituent oxide powders, which were subjected to high energy milling, without the use of any excess…
Using molecular dynamics (MD) simulation, we have investigated the mechanical properties and the microstructural evolution of nanocrystalline tantalum (NC-Ta, grain size from 3.25 nm to ~13.0 nm) under uniaxial tension. The results show the flow stress at a given offset strain decreases as the grain size is decreased…
The classical techniques of PI film metallization by either vapour deposition or electrochemical reduction of metals involve necessary technological steps such as polymer surface modification via plasma or ion beam, electron beam, or photolytic treatment, or surface sensitization by the conferment of catalytic propert…
We present Monte Carlo simulations of the first stages of the coherent precipitation of Cu in α-Fe during thermal ageing and under irradiation. The simulations are based on a diffusion model by vacancy and self-interstitial jumps, the parameters of which are fitted on ab initio calculations. The simulations of precipi…
The electronic structure of Mn in amorphous Si (a-MnxSi1−x) is studied by x-ray absorption spectroscopy at the Mn L3,2 edges for x=0.005−0.18. Except for the x=0.005 sample, which shows a slight signature of Mn2+ atomic multiplets associated with a local Mn moment, all samples have broad and featureless L3,2 absorptio…