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。
Using the spectral moment's method, the infrared spectra of single-walled boron nitride nanotubes are calculated. The dependence of these modes has been calculated as a function of the nanotube chirality, diameter (from 0.7 to 5 nm), and length. These predictions are useful for understanding the experimental infrared…
A simple chemical route using ternary 1-butanol/olive/water microemulsion systems without surfactant has been developed to synthesize spherical CdS nanoparticles with an average diameter of ca. 45 nm. The CdS nanoparticles were investigated by transmission electron microscopy (TEM), UV-VIS optical absorption spectrum…
Lineshape analysis of high resolution synchrotron radiation (SR) diffraction patterns of polycrystalline α-BiFeO 3 is presented. The observations can be explained by assuming a symmetry lowering from the rhombohedral R 3 c to the monoclinic C c . The lattice constants for the monoclinic C c group are given. The symmet…
In the Bi(2)O(3)-MO-P(2)O(5) ternary system, the commonly observed sizable 1D ribbon-like units have been extended to their 2D infinite end member, leading to the novel tailormade Bi(4)MO(4)(PO(4))(2) compounds. It contains planar [Bi(2)O(2)](2+) derivatives, separated by two slabs of PO(4), which create channels host…
Sintering is a process for ironmaking operations; it represents one of the main sources of production emissions of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzo-furans, NOx and SOx. In the present study, the operating conditions through which a reduction of dangerous emissions can be achieved are defined…
Fayalite (Fe 2 SiO 4 ), and other Fe-rich olivine, is often found in the reducing environments of the Moon, Mars, and other extraterrestrial bodies, but the oxidation state of the terrestrial mantle restricts the amount of Fe found in olivine on Earth. For this reason, synthetic fayalite is needed for use in planetary…
Rehydroxylation of the previously dehydroxylated dioctahedral 2:1 layer clay mineral occurs preferentially in specific sites within the former octahedral sheet. The rehydroxylation of dehydroxylated Al-rich and Al,Mg-rich 2:1 layers occurs as trans-vacant (tv) structural arrangements, regardless of whether the initial…
Abstract Composite hydrogels consisting of nanofibrous bacterial cellulose (BC) embedded in a biocompatible polymeric matrix of various methacrylates were synthesized by UV polymerization using the ‘ever‐wet’ technique. The effect of monomer(s) type and ratio, system dilution at polymerization, monomer(s) hydrophilici…
Abstract Low‐density polyethylene/spherical silica (LDPE/SGS) nanocomposites, containing 1, 2, and 6 wt % neat and modified (having amine functional groups) silica nanoparticles, were prepared by melt mixing using a twin‐screw corotating extruder. To improve the dispersion degree of the nanoparticles, glicydyl methacr…
A hallmark of Alzheimer's disease is the accumulation of insoluble fibrils in the brain composed of amyloid beta (Aβ) proteins with parallel in-register cross-β-sheet structure. It has been suggested that the aggregation of monomeric Aβ proteins into fibrils is promoted by "seeds" that form within compartments of the…
It is well known that surface energy and the associated properties such as surface stress and surface elasticity have a significant effect on the physical behavior of nanostructures. In this letter, using a combination of atomistic simulations and a simple continuum model, we elucidate the role of surface roughness on…
Announcement| April 01, 2012 New Mineral Names* Kimberly T. Tait Kimberly T. Tait † Department of Natural History, Royal Ontario Museum, 100 Queens Park, Toronto, Ontario M5S 2C6 Canada †E-mail: ktait@rom.on.ca Search for other works by this author on: GSW Google Scholar American Mineralogist (2012) 97 (4): 759–761. h…
Abstract Deformability of molten ultra‐high molecular weight polyethylene (UHMWPE) was studied in the plane‐strain compression at the temperature from a range of 145–165°C. Two grades of UHMWPE were tested—a commercial one synthesized in a slurry process with conventional Ziegler‐Natta catalyst and the material polyme…
Extinction spectra of colloidal germanium nanocrystals suspended in benzonitrile without the use of ligands were measured, and absolute absorption cross sections are reported. Comparison to cross sections calculated using the Mie solution to Maxwell’s equations reveals that, as the mean nanocrystal size is reduced fro…
Epitaxial (0001) ZnO thin films were grown on (111) Si substrates buffered with intermediate epitaxial (111) yttria-stabilized zirconia (YSZ) layers by pulsed laser deposition (PLD). X-ray diffraction and transmission electron microscopy characterizations revealed that the YSZ buffer layers enabled the epitaxial growt…
The MgZnO/ZnO/MgZnO double heterostructure was deposited at low temperature by a vapor cooling condensation system to enhance the light emission of the ultraviolet p-AlGaN/i-MgZnO/i-ZnO/i-MgZnO/n-ZnO:In light-emitting diodes (ULEDs). The defect and vacancy concentrations of the deposited films were effectively reduced…
A single phase of calcium copper titanate [CaCu3Ti4O12 (CCTO)] was produced at lower temperature and shorter calcination time via a novel semiwet route. Undoped CCTO and zinc doped CaCu3−xZnxTi4O12 samples with x = 0·10, 0·20 and 0·30 were prepared by this method for the first time using solid TiO2 powder in metal nit…
The structure development of nanocrystalline yttria-stabilized zirconia (ZrO 2 –3.4 mol % Y 2 O 3 ) synthesized by coprecipitation of hydroxides followed by microwave drying and calcination in the temperature range from 300 to 1000 °C was investigated. A complex series of methods was used for the structure characteriz…
For over three decades, the infrared spectroscopy peaks of around 3500 cm${}^{\ensuremath{-}1}$ observed in hydrogen-doped SrTiO${}_{3}$ samples have been assigned to an interstitial hydrogen (H${}_{i}$) attached to a lattice oxygen with two possible configuration models: the octahedral edge (OE) and the cubic face (C…
The continuous precipitation of silver nanoparticles was performed at room temperature using sodium borohydride (NaBH 4 ) as the reducing agent. The effects of the concentration of the silver precursor (i.e., silver nitrate), the quantity of dispersing polymer [poly(vinyl pyrrolidone), PVP], and the flow rates of the…