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。
The sintering kinetics of the porous ceramics from natural diatomite is investigated by means of stepwise isothermal dilatometry (SID) accompanied with XRD, scanning electron microscope (SEM), and porosity measurement. We find that the isothermal shrinkage data from SID could be well analyzed to get kinetic parameters…
This work proposes a methodology to estimate core losses under pulsewidth modulation (PWM) or dc bias ripple voltage excitations. A special hysteresisgraph was built to measure toroidal samples under pulsed voltages. An experimental methodology, based on the principles of ferromagnetism, was implemented to investigate…
Polycarbosilane (PCS) was used as a precursor to prepare porous silicon carbide (SiC) ceramics with in situ growth of β‐SiC nanowires. The pore size of the as‐prepared porous ceramics was 1.37 μm in average, and had a narrow distribution. The nanowires with diameters ranging from ∼10 to 50 nm existed in the channels o…
Polypyrrole-poly(N-vinylcarbazole) (PPy-PVK) core-shell nanoparticles have been fabricated by nanoparticle-seeded dispersion polymerization. The monodisperse PPy nanoseeds are fabricated by micelle templating, and the PVK shell thickness is easily tuned by varying the amount of N-vinylcarbazole monomer. The PPy core a…
Well-aligned ZnO nanorod arrays were synthesized by thermal evaporation of ZnO powder on ZnO thin films. The nanorods are almost the same length of 5.5μm and well-oriented perpendicular to the substrates. The time-integrated and time-resolved photoluminescence spectra of the nanorod arrays revealed the existence of la…
Most of the research on particle laden polymeric (PLP) thermal interface materials (TIM) have been primarily focused ob understanding the thermal conductivity of these types of TIMs. For thermal design reduction of the thermal resistance is the end goal. Thermal resistance is not only dependent on the thermal conducti…
Using neutron powder diffraction, we have investigated the structure of ${\mathrm{Ba}}_{2}\mathrm{Fe}\mathrm{Mo}{\mathrm{O}}_{6}$ at temperatures between 10 and $490\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The structure of ${\mathrm{Ba}}_{2}\mathrm{Fe}\mathrm{Mo}{\mathrm{O}}_{6}$ is cubic $Fm\overline{3}m$ and tetragon…
Different kinds of natural wood specimens (beech, pine, and rattan) were converted to biomorphic, microcellular Si–Mo–C ceramics by reactive melt infiltration processing. During processing at 1500°C under vacuum the carbon of the pyrolyzed native preforms reacted with Si of the infiltrating Si–Mo eutectic melt (90.4 w…
Organosilicon thin films were deposited from octamethylcyclotetrasiloxane and hydrogen peroxide using pulsed-plasma-enhanced chemical vapor deposition. Fourier transform infrared (FTIR) analysis shows significant organic content as well as hydroxyl and silanol moieties present in the as-deposited materials. Complete r…
Two new compounds, LiBi4Nb3O14 and LiBi4Ta3O14, have been synthesized by the solid-state method, using Li2CO3, Bi2O3, and M2O5 (M = Nb, Ta) in stoichiometric quantities. These compounds crystallize in the monoclinic C2/c space group with a = 13.035(3) A, b = 7.647(2) A, c = 12.217(3) A, beta = 101.512(4) degrees , V =…
Porous alumina was fabricated and optically characterized over a wide spectral range. Layers were formed electrochemically in oxalic acid solution from 10-μm-thick aluminum films evaporated onto silicon wafers. The layer formation was monitored with in situ spectroscopic ellipsometry in the visible and near-infrared w…
Single-crystalline Al4O4C nanowires can be synthesized at a high yield via a simple high-temperature solid reaction. A two-step method has been developed to convert the prepared nanowires into single-crystalline α-Al2O3 nanotubes (see Figure). These nanotubes may find high-temperature applications due to their unmatch…
Nanosized NiZn ferrite powder is synthesized by a low‐temperature method, using a unique combination of citric acid and glycine. An appropriate molar ratio of both citric acid and glycine offers a low‐temperature synthetic route by incorporating the complexation behavior of citric acid and the combustion nature of gly…
Regular patterns of ferroelectric PbTiO3 nanostructures (see Figure) with lateral dimensions down to 30–60 nm have been grown onto platinized Si substrates by chemical solution deposition. The high registration of the grains is achieved by “top–down”-generated templates of TiO2 dots as seeds for their deposition. Ferr…
We report on the preparation of layer-by-layer (LbL) assemblies based on anionic hydrophobically modified polysaccharides and different polycations. We systematically investigate the influence of the effect of the hydrophobicity of the polysaccharide derivatives on the multilayer buildup. We provide clear evidence tha…
In this work, the microstructural coarsening induced by heat treatment at temperatures between 1450° and 1750°C, for different zirconia‐toughened alumina (ZTA) materials has been studied. In doing so, grain growth kinetics and fracture toughness have been documented and analyzed. Obtained results are discussed and rat…
Abstract Porous silicon (PSi) is a versatile material that possesses a wide range of morphologies. There are two main types of microstructures that are widely used and well studied: branchy mesoporous silicon with pore sizes from 10 nm to 50 nm and classical macroporous silicon with pore sizes from 500 nm to 20 µm. Mu…
Chemical nanopatterns down to 50 nm in feature size have been fabricated via nanoimprint lithography and used to simultaneously control azimuthal and polar orientation of liquid crystals (LCs). The polar orientation depends on the ratio of the homeotropic/planar surface potential areas, while the LC azimuthally orient…
The Al 2 O 3 –SiO 2 system has been reassessed using a solution model for mullite extending from sillimanite to a hypothetical state of alumina. The property of sillimanite, to be used to describe one of the end‐members, was extracted from an analysis of the T – P phase diagram for Al 2 SiO 5 polymorphs. It was possib…
A novel framework for the one-dimensional analysis of a thermoelectric module (TEM) in which controlled and uncontrolled sides rather than cold and hot sides of it are defined is introduced. Next, heat conduction in a TEM is considered within this framework. Then, the operating modes of a TEM (cooling, generation, etc…