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。
Single-wall fullerene nanotubes were converted from nearly endless, highly tangled ropes into short, open-ended pipes that behave as individual macromolecules. Raw nanotube material was purified in large batches, and the ropes were cut into 100- to 300-nanometer lengths. The resulting pieces formed a stable colloidal…
The relationship between the fraction of material removed and the degree of penetration often observed in the literature during single-particle grooving tests on metals is examined in terms of low cycle fatigue. It is shown that the fraction of material removed is closely related to the low cycle fatigue behaviour of…
A new ordering scheme in cationic-deficient perovskite-like phases of the Ba n (Mo,Nb) n - δ O 3 n - x system has been described for the composition Ba 3 MoNbO 8.5, which has an oxygen stoichiometry between those of the 9R polytype and the palmierite structure. An electron diffraction and high-resolution electron micr…
A new chemical and electrochemical synthesis of the linear tetranuclear manganese complex, [Mn 4 IV O 6 (bpy) 6 ] 4+ (bpy = 2,2‘-bipyridine) ( 4 ) is described. This complex can be synthesized by a two-electron oxidation of an aqueous solution of the mononuclear [Mn II (bpy) 3 ] 2+ ( 1 ) one. The aqueous solutions wer…
A sandwich composed from indium−tin oxide, an electrodeposited hole transport layer, a layer of a stacked platinum complex, and an aluminum electrode acted as a photodiode. Exposure of the sandwich to organic vapors changed the color of the platinum complex and changed the action spectrum of the photodiode.
Accelerator-based nuclear techniques were used to study the ageing of as-prepared and aluminium-capped porous silicon samples with a porosity of 55% and with two different morphologies (microporous and mesoporous). Aluminium surface capping layers with thicknesses in the range 0.1-0.5 m were applied by rf sputtering.…
The liquid−liquid coexistence region of aqueous lysozyme−NaCl solutions was examined by time-resolved small-angle static light scattering and light microscopy. At the initial stages of the reaction scattered intensities peaked at finite scattering vectors as expected for globular domains growing under the influence of…
We report a facile, low-temperature reaction between condensed-phase NO 2 and H 2 O that leads ultimately to the formation of a large concentration (θ 0 = 0.42 monolayers) of adsorbed oxygen adatoms on a Au(111) surface. This reaction represents a novel route to generate surface oxygen on Au that can be utilized in fu…
A solvothermal elemental reaction to nanocrystalline zinc selenide was proposed. The coordinating ability of the solvent was found to play an important role on the nucleation and growth of the nanocrystalline ZnSe.
Bringing together the leading European expertise in behaviour and design of silos, this important new book is an essential reference source for all concerned with current problems and developments in silo technology. Silos are used in an enormous range of industries and the handling characteristics of many industrial…
We describe a new continuum approach to the modelling of stress propagation in static granular media, focussing on the conical sandpile created from a point source. We argue that the stress continuity equations should be closed by means of scale-free, local constitutive relations between different components of the st…
We report a 10-Hz, highly efficient, widely tunable (from the visible to the IR), broadband femtosecond optical parametric generator and optical parametric amplifier (OPA) in BBO, LBO, and CBO crystals pumped by the frequency-doubled output of a regeneratively amplified Ti:sapphire laser at 400 nm. The output of the s…
Laser ablation into vacuum of a dilute dispersion of AmO 2 in polyimide produced organoamericium ions of the general formula AmC x H y N z + . Ion masses were determined by time-of-flight mass spectrometry, and compositions were confidently assigned for most small ions ( x ≤ 6). Comparisons of product abundances with…
An approach to the analysis of the plate-type catalysts for high-dust selective catalytic reduction (SCR) applications is herein presented. Commercial systems were studied in the form of slabs. NO x reduction and SO 2 oxidation runs were performed spanning a wide range of operating conditions. The results were analyze…
Ultrasmall light modulators have been made by sandwiching a polymer-dispersed liquid crystal (PDLC) between two ferrules with optical fibers. The device can modulate light independent of the state of polarization, because the PDLC becomes transparent or opaque when either sufficient or no voltage is applied to the fil…
Geometry optimizations were carried out for the cis and trans forms of Nb 2 W 4 O 19 4 - . The energy difference between the two conformations was found to be 2.3 kcal mol - 1, the structure in which the two Nb atoms are in the cis formation being the most stable. Several isomers of the Nb 2 W 4 O 19 H 3 - anion were…
To obtain insights into the factors that influence the electronic spectra of conjugated porphyrin systems, a series of porphyrins with fused phenanthrene subunits have been synthesized. 9-Nitrophenanthrene reacted with esters of isocyanoacetic acid in the presence of DBU in THF to give a series of phenanthro[9,10- c ]…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTTight Knots in PolymersMarc L. MansfieldView Author Information Michigan Molecular Institute, 1910 W. St. Andrews Road, Midland, Michigan 48640 Cite this: Macromolecules 1998, 31, 12, 4030–4032Publication Date (Web):May 20, 1998Publication History Received6 January 1998Publishe…
In this study, we select a catalyst with the highest activity to reduce NO with CO as a reducing reactant from four series of perovskites La 1 - x Sr x BO 3 where B = Mn, Fe, Co, or Ni. The cause for different activities is also closely examined by characterizing the perovskites by XRD, XPS, NO-TPD, and CO-TPR. Activi…
Experiments using a blunted conical indentor show that the low-density amorphous solid form of pressure-amorphized ice deforms under load and behaves like a viscous liquid near 143 K, much before its rapid crystallization to cubic ice. Since a mechanical stress biases the molecular diffusion of a fluid undergoing a Ne…