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 geometries and harmonic vibrational frequencies of several possible intermediates involved in the NO decomposition mechanism catalyzed by Cu−ZSM5: ZCu(NO 2 )(NO), ZCu(N 2 O 3 ), ZCu(N 2 O)(O 2 ), ZCu(N 2 O), and ZCu(O 2 ), have been determined using the B3LYP density functional approach and a tritetrahedral model…
A procedure is presented for experiments on naked unfrozen protein crystals with the crystal mounted in a conventional cryo-loop and surrounded by a stream of a wet gas. The composition and temperature of the vapour stream can be adjusted to keep the crystal without deterioration for many hours. The arrangement allows…
We present quasielastic light scattering and dielectric spectra of the glass former alpha-picoline. At high temperatures the evolution of the susceptibility minimum is well described by the mode coupling theory (MCT). Below the critical temperature T(c) the simple scaling laws of MCT fail due to the appearance of the…
Sandwich structured (Bi, La) 4 Ti 3 O 12 /Pb(Zr, Ti)O 3 /(Bi, La) 4 Ti 3 O 12 thin films were fabricated on Pt/Ti/SiO 2 /Si substrates, with the intention of simultaneously utilizing the advantages of both (Bi, La) 4 Ti 3 O 12 (BLT) and Pb(Zr, Ti)O 3 (PZT) thin films such as non-fatigue behaviours of BLT and good ferr…
This paper concerns the effect of changes in experimental conditions on the micrometric-scale organization observed in hybrid materials obtained from six rigid rod and semi-rigid bis-trialcoxsilylated precursors and one trisilylate after polycondensation at silicon. Different solvents and catalysts have been studied s…
The phase-separation dynamics of a ternary mixture (A, B and C) coupled with a reversible chemical reaction between the two constituents A and B is presented. It is demonstrated that the free-energy functional form of time-dependent-Ginzburg-Landau equation describing the phase-separation dynamics of the ternary mixtu…
The pressure-temperature phase diagram of the organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{I}$ determined by resistive measurements is presented. Under a hydrostatic pressure of about 1 kbar an insulating state…
The structural and magnetic properties of ${\mathrm{Tm}}_{2}{\mathrm{Fe}}_{17}$ and ${\mathrm{Tm}}_{2}{\mathrm{Fe}}_{17}{\mathrm{D}}_{3.2}$ are investigated by means of x-ray-diffraction, thermal, and ac magnetic susceptibility measurements, and iron-57 M\"ossbauer spectroscopy. Both compounds crystallize in a hexagon…
Molybdenum oxide thin films were obtained by r.f. reactive sputtering of a molybdenum target. Optical and electrical characterization was performed in order to determine the energy gap and to investigate the electrical transport mechanism. In particular, electrical characterization showed that the transport properties…
Abstract Because of the poor impact behavior of polypropylene (PP) at low temperatures, the blending of PP with metallocene‐polymerized polyethylene (mPE) elastomers was investigated in this study. However, a reduced modulus of the overall blend was inevitable because of the addition to elastomers. To obtain a balance…
Effects of cylindrical and spherical confinement on the kinetics of the isotropic-nematic quench is studied numerically. The nematic liquid crystal structure was modeled by a modified induced-dipole--induced-dipole interaction. Molecules were allowed to wander around points of a hexagonal lattice. Brownian molecular d…
A multilayer film of TiCl x, model Ziegler−Natta catalyst for stereospecific polymerization, was produced by electron beam-induced deposition of TiCl 4 on an Au substrate at 100 K. The deposition of solid-phase TiCl x took place by dissociation of TiCl 4 adsorbed at the substrate surface by electrons both primary and…
New results using chemical force microscopy examine the relationships between polyions and both charged acid surface groups (COOH) and neutral oligoethylene oxide (EG) functionalized surfaces. Although poly(ethylene oxide) (PEO) and its derivatives have been known to resist protein deposition, our data indicate that c…
This note focuses on two different ways of enhancing the use of gels in protein crystallization by applying oils to the trials. Using a five-channel motorized syringe setup, crystals were grown in gelled microbatch drops under oil and compared with those grown under similar conditions in standard microbatch drops. The…
Microcrystallites of hexagonal silicon (Si) have been deposited during the elaboration of SiO 2 films. A good quality crystallographic structure is clearly identified in this uncommon material through microdiffraction, Raman scattering and photoluminescence techniques. Raman spectra exhibit two lines, one in crossed p…
The one-step synthesis of amino-polyether tri-tert-butyl ester monomer 2, by condensation of TRIS with tert-butyl acrylate, is reported. The nitrogen of the monomer can be protected with a Cbz group; subsequent removal of the tert-butyl esters with formic acid affords a triacid that is coupled to three monomers to aff…
The new tris( tert -butoxy)siloxy complexes of aluminum, Al[OSi(O t Bu) 3 ] 3 (THF) ( 1 ), Al[OSi(O t Bu) 3 ] 3 (HO i Pr)·0.5[Al(O i Pr) 3 ] 4 ( 2 ), and [( i PrO) 2 AlOSi(O t Bu) 3 ] 2 ( 3 ), were synthesized. Compounds 2 and 3 were structurally characterized by single-crystal X-ray crystallography. Thermolysis of a…
We have investigated the possibility of using carbon nanotubes as flexible, mobile electrical probes able to electrically contact nanometre-scaled objects. Configurations with metal electrodes evaporated on top of multi-, few- and single-wall carbon nanotubes have been studied. Scanning probe manipulation was used to…
Monochromatic UV light in the spectral interval between 4.0 and 5.5 eV is used in order to selectively excite 3- and 4-coordinated oxygen anion sites on the surface of MgO nanoparticles exposed to O2 gas. As a result, two different paramagnetic O− surface species and also ozonide anions O3− are observed by electron pa…
Texture measurement with short-wave X-ray synchrotron radiation in the range of λ ≃ 0.1 Å is described. The measurements were carried out with the multipurpose diffraction instrument at the high-field wiggler, high-energy beamline BW5 at HASYLAB. The instrument was equipped with an on-line image-plate area detector fo…