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。
All epitaxial oxide magnetic tunnel junctions, ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}/{\mathrm{SrTiO}}_{3}/{\mathrm{SrRuO}}_{3}$ trilayer films, composed of ferromagnetic and metallic electrodes were fabricated on STO(001) substrates. Inverse tunnel magnetoresistance (TMR), i.e., higher and lower ju…
A new mesoporous silica structure with cubic Iad symmetry has been synthesized. The structure has very large unit cell dimensions, up to 250 A in the as-synthesized form and 222 A after calcination, and the surface area is around 700 m2/g. The syntheses were done according to well-established synthesis conditions with…
Nitrogen is the most important defect in diamond forming a series of aggregates that are used to characterize different types of diamond. Aggregation of substitutional N and O are investigated using detailed ab initio plane-wave calculational procedures. Different charge states of the N-N substitutional pair (the A ce…
Abstract We propose a new Raman pressure scale based on the shift with pressure of the fundamental Raman band of micrometer‐sized diamonds. First, we confirmed that the pressure slope of the triply degenerate diamond phonon behaves in a similar fashion to that of the bulk. Our measurements were calibrated Raman agains…
The rheological properties of a sunflower protein isolate (SFPI) were studied, and injection-molded pieces were produced. Various mixtures of SFPI (100 parts by weight), glycerol (10−50 parts), water (10−50 parts), and sometimes sodium sulfite (used as reducing agent, 1−10 parts) were studied. Power-law-type modeling…
Abstract The electrocatalytic oxidation of methanol at a glassy carbon electrode modified by a thin film of poly( o ‐aminophenol) (PoAP) containing Pt, Pt‐Ru and Pt‐Sn microparticles has been investigated using cyclic voltammetry as analytical technique and 0.10 M perchloric acid as supporting electrolyte. It has been…
Modification of porous silica with aminopropylalkoxysilanes was studied under an inert atmosphere by a gas-phase technique, atomic layer deposition. Trifunctional γ-aminopropyltrimethoxysilane and γ-aminopropyltriethoxysilane (APTS), bifunctional γ-aminopropyldiethoxymethylsilane (APDMS), and monofunctional γ-aminopro…
We present the quasiparticle band structure and the optical excitation spectrum of bulk LiF and the LiF(001)-(1\ifmmode\times\else\texttimes\fi{}1) surface. First, we calculate the ground-state geometry of the bulk and the surface using density-functional theory within the local-density approximation. Next, applying t…
Strong polarization-sensitive anisotropy of the optical absorption in the visible and infrared spectral range is observed in porous silicon (PSi) layers formed from bulk (110) Si wafers. It is shown that the anisotropy of the absorption via band-to-band and intraband (Drude-like) electronic transitions is consistent w…
The growth or dissolution of small gas bubbles (R0<15 microm) by rectified diffusion in nearly saturated liquids, subject to low frequencies (20 kHz<f<100 kHz) and high driving acoustic fields (1 bar<p<5 bars), is investigated theoretically. It is shown that, in such conditions, the rectified diffusion threshold radiu…
Coupled mechanical and electronic behaviours of single walled open carbon nanotubes (CNTs) under applied electric field and tensile loading are investigated by the use of quantum mechanics as well as quantum-molecular dynamics techniques based on the Roothaan–Hall equations and the Newton motion laws. Different failur…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFourier Transform Infrared Investigation of the Deformation Behavior of Montmorillonite in Nylon-6/Nanoclay NanocompositeLeslie S. Loo and Karen K. GleasonView Author Information Department of Chemical Engineering, Massachusetts Ins…
Ab Initio molecular dynamics simulations have been performed to study the hydration of a sodium smectite clay. Water molecules are intercalated as a double layer in the interlayer spacing of this swelling clay mineral. The solvent structure was found to be very similar to predictions by a previous Monte Carlo study ba…
Er 3+ doped Na 2 O–Nb 2 O 5 –TeO 2 (NNT) glasses suitable for making optical waveguide devices has been fabricated and characterized. Intense 1.53 μm infrared fluorescence and green upconversion luminescence were observed under 975 nm diode laser and 798 nm laser excitation. The optical absorption, the Judd–Ofelt para…
We show that granular media, consisting of metallic microparticles immersed in a poorly conducting liquid in a strong dc electric field, self-assemble into a rich variety of novel phases. These phases include static precipitates: honeycombs and Wigner crystals; and novel dynamic condensates: toroidal vortices and puls…
Organo-functionalised MCM-41 nanoparticles have been prepared by a dilution/neutralisation method involving the surfactant-templated co-condensation of 3-aminopropyltriethoxysilane, allyltriethoxysilane or 3-mercaptopropyltriethoxysilane with tetraethoxysilane under alkaline conditions. The presence of covalently coup…
Soda-lime silicate glass is the fundamental base glass for many technologically important oxide glasses, and it has been used as window glass since the Roman Empire. Mixed-cation silicates also are useful models of the structure and dynamics of basaltic magmas and mantle melts. The diffusivity of Na + in silicate melt…
Abstract An overview of heterogeneous epoxidation catalysts is given, with an emphasis on practical parameters such as catalyst productivity, turnover numbers and stereoselectivity. Special focus is directed towards catalysts that have resulted from research in the authors' group.
During the chemical vapor deposition of multiwalled carbon nanotubes using the vapor phase delivery of a metal-organic (ferrocene) catalyst precursor, a strong selectivity for growth on patterned SiO 2 /Si substrates has been observed. A mechanism for this selective growth is described here. Delivered metal particles…
We compare the phase behavior of a series of lithium perchlorate-doped poly(isoprene- b -styrene- b -ethylene oxide) (ISO) and poly(styrene- b -isoprene- b -ethylene oxide) (SIO) triblock copolymers. Complete phase diagram isopleths ( f I = f S ) are described for the lithium-doped ISO system and the previously report…