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 total vapor pressures of NdCl 3, NdBr 3, and NdI 3 were measured by the torsion effusion method. By a least-squares treatment of the experimental data, the following equations were selected as representative for the temperature dependence of their vapor pressures in the covered temperature ranges: NdCl 3 (s), log(…
An in situ silanization reaction on the surface of freshly prepared porous silicon (PS) has been achieved at room temperature with a trace of amine as the catalyst. Infrared absorption spectra (FTIR) and X-ray photoelectron spectroscopy measurements show that the silanes are successfully attached to the surface of the…
Nitrogen physisorption measurements of silicon nitride materials obtained from silicon diimide show the valuable porosity of these compounds in the mesopore regime and very high specific surface areas up to 1000 m2 g−1, suitable for catalytic applications. The pore size of the solids is effectively tailored by the var…
Abstract A poly(amic acid) was prepared by the reaction of 3,3′‐dihydroxybenzidine and pyromellitic dianhydride in N,N ‐dimethylacetamide. Hexadecylamine was used as an organophilic alkylamine in organoclay. Cast films were obtained from blend solutions of the precursor polymer and the organoclay. The cast film was he…
The potential of chitosan as an emulsion stabilizer is combined with the miniemulsion technique to generate oil droplets, hollow capsules, and latex particles in the diameter range of 100-300 nm carrying a functional biopolymer surface. It turned out that chitosan alone, independent of its molecular weight, is just mo…
Monodisperse lead selenide nanoparticles have been successfully prepared via a sonochemical route from an aqueous solution of lead acetate and sodium selenosulfate in the presence of complexing agents under ambient air. It was found that when trisodium citrate was used as the complexing agent, the product was spherica…
Au nanoparticles supported over Co3O4 lead to a highly active and stable catalyst for N2O decomposition even in the presence of excess oxygen and steam.
The devolatilization kinetics of a biomass charcoal was studied by thermogravimetry−mass spectrometry. The overall mass loss rate (DTG curve) and the mass spectrometric intensities of ions H 2 +, CH 3 +, C 2 H 2 +, C 2 H 3 +, and C 2 H 5 + were evaluated. The distributed activation energy model (DAEM) was employed, si…
Massive macroscopic ropes of well-aligned single-walled carbon nanotubes (SWNTs) with a larger mean diameter of about 1.72 nm, synthesized by a semicontinuous hydrogen arc discharge method, were employed for electrochemical hydrogen adsorption experiments. A high discharge capacity of 503 mAh/g, corresponding to 1.84…
In many solid solutions plastic deformation becomes unstable at sufficiently high temperature due to dynamic strain aging, i.e., repeated breakaway of dislocations from their solute clouds and recapture by mobile solutes, producing stress serrations in constant strain-rate tests or strain bursts in constant stress-rat…
The use of NO x traps is one strategy being pursed to enable the implementation of more fuel-efficient lean-burn gasoline engines. Materials development to enhance NO x storage capacity and sulfur tolerance will be necessary for performance improvement. Progress in these areas will benefit from a more detailed underst…
A series of ternary Eu 3+ complexes are presented consisting of a polydentate m -terphenyl-based Eu 3+ complex (Eu) 1 and different antenna chromophores possessing lanthanide(III) ion coordinating properties. The series of investigated antenna chromophores consist of 1,10-phenanthroline, tetraazatriphenylene, and thre…
An algebraic model based on Lie-algebraic and discrete symmetry techniques is applied to the analysis of thermodynamic vibrational properties of molecules. The local anharmonic effects are described by a Morse-like potential and the corresponding anharmonic bosons are associated with the SU(2) algebra. A vibrational h…
A new approach to create chemically patterned surfaces utilizing polymers and copolymers is introduced. In this approach, chemical patterns are achieved by the direct stamping of functional polymers onto a surface containing complementary functional groups. The resulting pattern is then used as a template for the furt…
We have studied the critical temperature of Diluted Magnetic Semiconductors by means of Monte Carlo simulations and Coherent-Potential-Approximation (CPA) calculations. In our model for this syste m, the magnetic ions couple with the carriers through an antiferromagnetic exchange interaction, $J$, and an electrostatic…
We develop a theory for the inclusion of adatom interactions in second layer nucleation occurring in epitaxial growth. The interactions considered are due to ring barriers between pairs of adatoms and binding energies of unstable clusters. The theory is based on a master equation, which describes the time development…
Given an assembly of viscoelastic spheres with certain material properties, we raise the question how the macroscopic properties of the assembly will change if all lengths of the system, i.e. radii, container size etc., are scaled by a constant. The result leads to a method to scale down experiments to lab-size.
The theoretical investigations on electrorheological (ER) fluids are usually concentrated on monodisperse systems. Real ER fluids must be polydisperse in nature, i.e., the suspended particles can have various sizes and/or different dielectric constants. An initial approach for these studies would be the point-dipole (…
We present the first application of phase field modeling to electrochemistry. A free energy functional that includes the electrostatic effect of charged particles leads to rich interactions between concentration, electrostatic potential, and phase stability. The present model, explored for the equilibrium planar inter…
Static and dynamic aspects of the magnetization reversal in nanowire arrays are investigated. The arrays have been produced by electrodeposition of ferromagnetic metals (Fe, Co, and Ni) into porous anodic alumina templates, with diameters as small as 5 nm. The crystal structures of the nanowires are bcc (Fe) and fcc (…