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 reduction of crystalline size and amorphization of graphite and diamond during agate and stainless ball-milling are investigated by Raman spectroscopy. The ultimate crystalline size of graphite, estimated by the Raman intensity ratio, of 2.5 nm for the agate ball-mill is smaller than that of 3.5 nm for the stainle…
Acetobacter produces a gelatinous membrane composed of a cellulose network when grown in liquid culture under static conditions. The oxygen tension in the gaseous phase was found to have an effect on cellulose production and on the physical properties of the membrane. Cellulose production was higher at oxygen tensions…
The photoelectrochemical (PEC) characteristics of thin films of ‘Q-state’ CdS semiconductor particles in arachidic acid Langmuir–Blodgett (LB) layers have been examined. Initially, ‘Q-state’ size CdS particles of ca. 2 nm were formed in the film and then progressively grown to ca. 10 nm by a cyclic sequence, which inv…
Sixtus-Tonks experiment for an amorphous Fe/sub 77.5/Si/sub 7.5/B/sub 15/ wire made by quenching in rotating water has been performed under a tensile stress /spl sigma/. The data are analyzed using the formula V/sub w/=S(H-H/sub 0/), where V/sub w/ is the axial wall velocity, H is the steady field, and S and H/sub 0/…
Thin SiO_2 layers were deposited on the surface of porous Vycor glass by alternating vapor phase reaction with SiCl_4 and H_2O. The membranes prepared by this technique had a H_2 permeance of 0.3-0.4 cm^3(STP)/(min•cm^2•atm) and a H_2:N_2 selectivity of 500-1000 at 600 °C. The SiCl_4 dosage at each silylation cycle, t…
A combination of results from x-ray and neutron diffraction is used to obtain structural information about the metal-oxygen coordination shell in oxide glasses. Two ways to extract structural parameters of the Me-O coordination are presented. The first variant is a direct combination of both distance correlation funct…
We report on molecular dynamics simulations for model polyethylene chains, varying in length from 30 to 1000 CH2 units. We found that a certain minimum chain length is required for the formation of stable folded-chain lamellae. The present calculations show that this occurs when the chains have more than 150 CH2 units…
Silicon carbide with its excellent oxidation resistance and chemical compatibility with carbon is an attractive coating material for the high-temperature oxidation protection of graphite and carbon-carbon composites. One of the major challenges in the development of protective SiC coatings is preventing oxidation of t…
The doping of polyaniline has been achieved by introducing the dopant molecule into the solid, undoped polymer without the use of an auxiliary solvent. Complex formation in the solid phase occurs at elevated temperatures and results in the formation of a soluble and processable conducting complex. The complexation was…
The Cahn-Hilliard equation is a nonlinear evolutionary equation that is of fourth order in space. In this paper a linearized finite difference scheme is derived by the method of reduction of order. It is proved that the scheme is uniquely solvable and convergent with the convergence rate of order two in a discrete <in…
Reaction of a silicon trialkoxide with magnesium or nickel chloride leads to a new polymer in which organic side chains are linked to a phyllosilicate-like framework through Si–C covalent bonds.
The complex formation between Concanavalin A (Con A) and a polymer having pendant glucose groups was studied in order to design a glucose-sensitive polymer. The polymer having pendant glucose (poly(glucosyloxyethyl methacrylate) or (poly(GEMA)) forms a complex with Con A in tris HCl buffer (pH = 7.5). The solution the…
The effects of Cu substitution on the properties of NiZn ferrites sintered at low temperature with various compositions are investigated. The densification of NiCuZn ferrite is dependent upon Cu content in the composition, (Ni/sub 0.5-x/Cu/sub x/Zn/sub 0.5/)(Fe/sub 2/O/sub 3/)/sub 0.98/. Dispersion characteristics of…
Abstract A pH‐stat MSMPR crystallizer is used to obtain the nucleation rate equation of calcite formed in the Na 2 CO 3 ‐CaCl 2 reacting system. The experiments are conducted for seeded and unseeded runs. Effects of breakage and agglomeration on the crystalsize distribution are demonstrated. In a continuous operation,…
The graphene layers at carbon nanotube cap regions are efficiently cleaved by several oxidants (e.g., KMnO4, OsO4 and RuO4) in acidic solution at 100 °C, but not by stronger oxidants, such as K2Cr2O7–H+ and H2O2–H+.
A series of experiments in sea water at different hydrostatic pressures (from 1 to 300 bar) was carried out on some stainless steels containing different amounts of Cr, Ni, and Mo to investigate whether these elements and the hydrostatic pressure could affect the composition of tlte corrosion layer formed in sea water…
The formation, properties and applications of anisotropic, predominantly liquid-crystalline (LC), networks are described. These self-assembling systems exhibit macroscopic anisotropic (sometimes non-centrosymmetric) orientation in electric or magnetic fields, under strain or on orientation layers stabilised thermally…
Poly(L-lysine) was reacted with spiropyran reagents to give polypeptides containing 46 and 25 mol % spiropyran units in the side chains. The resulting modified polymers were soluble in hexafluoro-2-propanol (HFP), where they exhibited reverse photochromism. In pure HFP, the photochromic polymers were random coils and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFull Multiple Scattering and Crystal Field Multiplet Calculations Performed on the Spin Transition FeII(phen)2(NCS)2 Complex at the Iron K and L2,3 X-ray Absorption EdgesV. Briois, Ch. Cartier dit Moulin, Ph. Sainctavit, Ch. Brouder, and A.-M. FlankCite this: J. Am. Chem. So…
Abstract Comparison of oxygen and nitrous oxide indices indicates that ammonium polyphosphate (APP) should act in the condensed phase when added to nylon 6 (PA‐6). A detailed study of the thermal degradation mechanism of PA‐6/APP mixtures is carried out. A polyphosphate ester is formed on heating, which is the precurs…