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 chemistry of pyrolytic conversion has been studied for three polysilazanes, (ViSiHNH) n , (ViSiHNMe) n and [(ViSiHNH) 0.5 –(MeSiHNH) 0.5 ] n , precursors to silicon carbonitride ceramics. 13 C and 29 Si MAS and CPMAS NMR spectroscopies were used to clarify the processes leading to the formation of the silicon-base…
With Li x MoO 3 (x=0.31–0.40) as a host material, a new family of polymer–molybdenum bronze nanocomposites has been synthesized using an exfoliation/encapsulation methodology. Nanocomposites with poly(ethylene oxide), poly(ethylene glycol), poly(propylene glycol), poly(vinylpyrrolidinone), methyl cellulose, polyacryla…
Separation of acetic acid from palm oil mill effluent (POME) to increase its concentration by an anion exchange resin was examined as a preliminary study for its recovery from POME that had been anaerobically treated by sludge from a palm oil mill. This paper concerns the acetic acid thus separated for producing bacte…
Partial table of contents: Molecular Nonlinear Optics: Fundamentals and Applications (I. Ledoux & J. Zyss). Cascading: A Promising Approach to Nonlinear Optical Phenomena (G. Stegeman, et al.). Nonlinear Effects in Nematics Doped by Dyes and Chiral Agents (G. Abbate, et al.). New Nonlinear Materials for High--Power Fr…
Silica gel combined with potassium carbonate is an effective fire retardant for a wide variety of common polymers (at mass fraction of only 10% total additive) such as polypropylene, nylon, polymethylmethacrylate, poly(vinyl alcohol), cellulose, and to a lesser extent polystyrene and styrene-acrylonitrile. The peak he…
On the approach of corrosion protection of metal by TiO2 coating under illumination, the effects of iron oxides on the photoelectrochemical response of TiO2/carbon steel were studied. The iron oxides, magnetite (Fe3O4), maghemite (γ-Fe2O3) and hematite (α-Fe2O3), were prepared on the carbon steel by using both the che…
Monazite powder, prepared by heating rhabdophane-(La, Ce, Nd or Sm) at 600°C for 2 hours in air, was dry-pressed to disks and bars. The disks and bars of monazite could be sintered to the relative density (100·bulk density/true density) of larger than 99 % at 1200°C in air without cracking. The linear thermal expansio…
Lanthanide thiolates react with elemental sulfur to give Ln8S6(SPh)12(thf)8 clusters in high yield.
RATIONALE AND OBJECTIVES: Surface-modified contrast-carrying liposomes potentially are useful as computed tomography (CT) blood-pool agents. The biodistribution and CT-imaging behavior of conventional as well as polyethylene glycol (PEG)-coated iopromide-carrying liposomes were tested. Two different types of PEG-ylate…
A poly(amidoamine) hyperbranched AB2/B6 copolymer displays a viscosity/molecular weight profile similar to that shown by perfectly regular dendrimers.
Binary metal Mg–Co oxide materials have been synthesized from Mg–Co hydroxide precursors by a coprecipitation-then-calcination method. The oxide system shows high catalytic activity for low-temperature decomposition of N 2 O (27 mol%). Using FTIR, XRD, SEM, EA, DSC, BET and GC techniques, the hydrothermal synthesis an…
Two dinuclear nickel(II) complexes [Ni 2 (C 2 O 4 )(tren) 2 ][ClO 4 ] 2 1 and [Ni 2 (C 4 O 4 )(tren) 2 (H 2 O) 2 ][ClO 4 ] 2 2 [tren = tris(2-aminoethyl)amine, C 2 O 4 2- = oxalate dianion and C 4 O 4 2- = dianion of 3,4-dihydroxycyclobut-3-en-1,2-dione (squaric acid)] have been synthesized and characterized by single…
Over the last several decades, new technologies have enabled the in vitro cultivation of many different human cell types. At the same time, the art and science of medicine has been expanded to include new biopharmaceutical and recombinant genetic therapies. Organ transplantation has become commonplace, limited not by…
Silica and stannic (tin) oxide powders were synthesized by oxidation of their respective chlorides in single and double (inverse) diffusion flame reactors. The effect of reac-tant gas mixing on the characteristics of these powders (size and morphology) was investigated by altering the position of the fuel (CH4) and ox…
First-order kinetic behaviour during the thermal isomerization process of lipids with photochromic spiropyran head groups in benzene strongly depends on the dispersion state of the lipids and this enables the determination of their critical aggregation concentrations.
A means of generating foams of high-temperature polymers, polyimides, has been developed for use in dielectric layers in microelectronics. In these systems, the pore sizes generated are in the tens of nanometers range, thus the term “nanofoams”. The foams are generated by preparing phase-separated block copolymers wit…
Biocompatibility Standards: An International Overview (D. Marlowe, et al.). The Role of Material Standardisation and Method Validation in Evaluating Biocompatibility (J. Braybrook). Biodegradation and Toxicokinetic Studies (D. Gott). The Surface Analysis of Polymeric Biomaterials (M. Davies, et al.). Sterilisation Pro…
Mesoporous manganese oxides are prepared by reduction and oxidation mechanisms and by interconversions of layered materials.
The Floquet-Bloch theory is used to develop a theory for grating-assisted directional couplers which predicts the coupled power and coupling lengths and is applicable to lossy waveguides. This theory views grating-assisted directional couplers as conceptually similar to conventional synchronous (nongrating) couplers.…
To investigate the anchoring of precious metals onto carbon fibrils Pd/C-fibril samples were investigated in both the precursor and the reduced state by X-ray absorption fine structure (XAFS) spectroscopy. Analysis of the XAFS data of the freshly prepared catalyst showed a palladium–tetraamine complex in interaction w…