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。
Abstract A novel process using ultrasonic irradiation to enhance nanosilica dispersion in polypropylene‐based nanocomposites has been proposed and investigated. The nanocomposites were isotactic polypropylene reinforced with silica nanoparticles at 3 wt% loading level. Ultrasonic processing in the melt state is an eff…
Abstract Two samples of high‐density polyethylene with different molecular weight were processed in a batch mixer and the rheological and structural properties were investigated. In particular, the effect of different processing parameters and the eventual presence of different stabilizers were evaluated. Actually, tw…
On the mechanism of enhancement on electron field emission properties for ultrananocrystalline diamond films due to ion implantation, Joseph, P T, Tai, N H, Chen, C H, Niu, H, Cheng, H F, Pong, W F, Lin, I N
We study the diffusive behavior of two-dimensional charged colloidal suspensions subjected to a sinusoidal substrate by means of Brownian dynamics simulations. We mainly focus on the dependence of the mean-square displacement on the substrate strength. Our findings show a variation in the particle diffusion due to a s…
Crystal structures and electron-density distributions of ceria-zirconia CexZr1−xO2 compounds have been studied by the maximum-entropy method (MEM) and MEM-based pattern fitting combined with the Rietveld method using high-angular-resolution synchrotron x-ray powder diffraction data. The isotropic atomic displacement p…
The aggregation of the negatively charged complexes of hyperbranched poly(ethylenimine) (PEI) and sodium dodecyl sulfate (SDS) has been investigated at different sodium chloride (NaCl) concentrations using coagulation kinetics, electrophoretic mobility and dynamic light scattering measurements. The observed variation…
Hybrid materials of polymers and cadmium selenide nanocrystals (CdSe-NCs) were produced through a layer-by-layer deposition technique. Polymer series comprises sulfonic, phosphonic, and carboxylic acids; pyridine- and amine-based polymers; and some related bipolar amphiphiles, including a dithiol. Nonaqueous dispersio…
Abstract Catalytic activity during the formation of polyethylene (PE)/clay nanocomposites by in situ polymerization with metallocenes was studied. Ethylene polymerization was carried out with the homogeneous metallocene in the presence of the clay particles and using the clay‐supported metallocene catalyst. It was fou…
We have deposited nearly stress-free single-crystal thin films of (001) Pb(Mn,Nb)O3–Pb(Zr,Ti)O3 (PMnN-PZT) on (001)MgO substrates by rf-magnetron sputtering using a quenching process after the film growth. It is found that single c-domain/single-crystal thin films of PMnN-PZT containing 5%–10% PMnN show a strong hard…
Rare-earth niobates and tantalates are functional materials that are exploited as photocatalysts, host lattices for phosphors, and ion conductors. These phases are extremely challenging to synthesize by methods other than solid-state processing, which limits expansion of this useful class of materials. Hydrothermal pr…
The transport properties of hydrogen in metal hydrides are crucial to the kinetics of H2 storage in these materials. Previous first-principles calculations and experiments have shown that H transport in MgH2 and NaMgH3 is dominated by charged defects. This creates the possibility of enhancing hydrogen diffusion in the…
This short review covers flame retardant chemistry other than the main classes of halogen, phosphorus, or metal hydroxide, and instead focuses on the transition metal element flame retardants that have shown some effectiveness in reducing polymer flammability. There appears to be a lot of promise in these flame retard…
Abstract Water‐insoluble pullulan‐ g ‐poly( L ‐lactide) (PUPL) was successfully synthesized via a one‐pot method in the presence of triethylamine in dimethyl sulfoxide, in an effort to design a novel anticancer agent carrier. Three samples (designated as PUPL 1, 2, and 3) were obtained, which differed in the moles of…
Abstract The light fantastic : Two new 2‐(benzo[ b ]thiophene‐3‐yl)pyrroles have been synthesized, and are shown to exhibit optical properties that are promising for optoelectronic materials and devices such as highly efficient fluorescent sensors (see scheme). In addition a new BODIPY fluorophore, derived from 2‐(ben…
Crack disappearance by high-temperature oxidation was studied in alumina (Al2O3) composites toughened by Ni nanoparticles. This process is performed in air at temperature ranging from 1000 to 1300°C for 1 to 48 h. The results showed that crack disappearance depends on both annealing temperature and time. Complete crac…
Abstract This article deals with application of poly (3‐methyl thiophene) synthesized chemically on the surface of wood sawdust (termed as P3MTh/SD) and then was used for removal of silver ions (Ag + ) from aqueous solution. The polymer was synthesized directly on the surface of sawdust, which has previously soaked in…
The effect of interpolation schemes used for discretization of permeability in numerical simulations on macrosegregation and channel segregation (mesosegregation) during solidification has been studied. The different ways to discretize the permeability term and its effect on the interdendritic velocity are illustrated…
We report the experimental results of 75 As and 139 La nuclear magnetic resonance (NMR) in the layered oxypnictide system LaFeAs(O 1- x F x ) ( x =0.0, 0.04, 0.07, 0.11 and 0.14) where superconductivity occurs at x≳0.03. In the undoped LaFeAsO, 1/ T 1 of 139 La exhibits a distinct peak at T N ∼142 K below which the La…
A thin film comprising parallel tilted nanorods was deposited by directing silver vapor obliquely towards a plane substrate. The reflection and transmission coefficients of the thin film were measured at three wavelengths in the visible regime for normal-illumination conditions, using ellipsometry and walk-off interfe…
Abstract The thermal degradation of poly(lactic acid) (PLA) biopolymer was studied as used by the thermogravimetry analyzer in a nitrogen atmosphere in the temperature range of 100–500°C. The reaction was found under these experimental conditions to be of first order with an activation energy of 94.0 and 105.3 kJ/mole…