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。
We report the synthesis of unusually thick poly(2-hydroxyethyl methacrylate) (PHEMA) films on gold surfaces by surface-initiated atom transfer radical polymerization (ATRP). Polymerization from the surface occurs rapidly at room temperature in aqueous media, resulting in the formation of 700 nm thick polymer films in…
In this communication, the synthesis and characterization of the first perovskite nanotubes made by sol−gel template synthesis is demonstrated. SEM shows that the structures formed are 200-nm outer diameter tubes with 50-μm lengths. TEM and electron diffraction reveal that the tubes are polycrystalline. In a compariso…
This article reviews recent work in the area of non-innocent behaviour in polynuclear metal complexes. Non-innocence, which occurs when metal-based and ligand-based redox orbitals are similar in energy, has been known since the first dithiolene complexes of the Ni triad. Our recent work in this field is with complexes…
Self-assembled micro/nanotubes (650−76 nm in diameter) of polyaniline (PANI) were synthesized in the presence of β-naphthalene sulfonic acid (β-NSA) as a dopant. It was found that the diameter and room-temperature conductivity of the PANI−NSA tubes decreased with the decrease of the molar ratio of β-NSA to aniline. On…
Electron paramagnetic resonance and Hall measurements show consistently the presence of two donors ( $D1$ and $D2$) in state-of-the-art, nominally undoped ZnO single crystals. Using electron nuclear double resonance it is found that $D1$ shows hyperfine interaction with more than 50 shells of surrounding ${}^{67}\math…
The interaction of carbon disulfide, CS2, with polycrystalline MgO was investigated by means of infrared and UV–visible spectroscopies and ab initio electronic structure calculations. The aim was to understand the modifications of the surface properties of MgO microcrystals induced by the substitution of O2− with S2−…
We developed a method for controlling local architecture and chemistry simultaneously in biomaterial implants to control microvessel ingrowth in vivo. Porous polypropylene disks (5 mm in diameter and 40 microm thick) were plasma-coated with a fluoropolymer and then laser-drilled with 50-microm-diameter holes through t…
In the framework of the Ginzburg-Landau harmonic-potential approximation, we present a possible modeling of the time dependence of the frequency of the order-parameter mode suitable to account for the formation of correlated domains in noninstantaneous symmetry-breaking phase transitions. An interesting spectrum of po…
Abstract The influence of alkyl aluminum and alkoxysilane on the kinetics in liquid pool propylene batch polymerization was investigated with a highly active Ziegler–Natta catalyst system that consisted of MgCl 2 /TiCl 4 /diester–alkoxysilane/AlR 3 . In this study, diethyl phthalate and t ‐BuEtSi(OMe) 2 were used as a…
Abstract The depolymerization of poly(ethylene terephthalate) (PET), by an alcoholysis reaction is an easy operation and gives prospects for the utilization of wastes. PET waste was first depolymerized by glycolysis reaction at three different molar ratios of diethylene glycol (DEG), in the presence of manganese aceta…
This study was designed to evaluate the effect of polyethylene oxide (PEO) and negatively charged side chains on blood compatibility. For this, novel copolymers (MMA/MPEOMA/VSA copolymers) with both PEO and negatively chargeable side chains were synthesized by random copolymerization of methyl methacrylate (MMA), meth…
Abstract Photoluminescent properties of the europium tris(thenoyltrifluoroacetonate) dihydrate [Eu(TTA) 3 (H 2 O) 2 ] incorporated in epoxy resin in the solid state are reported. The polymeric Eu 3+ complex and the precursor compound were characterized by elemental analysis, thermogravimetry (TG), differential scannin…
The preferential oxidation (PROX) of CO on Ru/γ-Al2O3 in simulated reformer gas (1.0 kPa CO, 75 kPa H2, rest N2) was investigated over a wide range of CO partial pressures (0.02–1.5 kPa) and O2 excess (pO2∶pCO = 0.5–5.0). Integral flow measurements in a microreactor at λ = 2 show that ∼150 °C is the optimum temperatur…
Abstract A new interesting class of polyketoamine polymers based on diarylidenecycloalkanone were synthesized by suspension polycondensation. These polymers were synthesized via polymerization of 2,5‐bis(4‐chloroacetylbenzylidene)cyclopentanone and 2,6‐bis(4‐chloroacetylbenzylidene)cyclohexanone with different aliphat…
Group theoretical methods are applied to a ferroelectric phase transition in barium aluminate $({\mathrm{BaAl}}_{2}{\mathrm{O}}_{4}).$ The atomic displacements from x-ray-diffraction data are decomposed into four modes: a primary order parameter and three secondary order parameters. The spontaneous polarization ${P}_{…
Abstract A complete infrared (IR) spectroscopy experimental procedure was used to determine end‐group concentrations of poly(ethylene terephthalate) (PET). The correlations of the hydroxyl and carboxyl units were derived independently for accurate calibration results. The intermediate monomer of PET, bis(hydroxyethyl…
Contact between blood and biomaterial triggers a complex series of events including protein adsorption, leukocyte adhesion and activation, and complement activation. In this article, a series of fluorinated polyimides cured at a different temperatures was prepared, and the biocompatibility of the membranes was evaluat…
We investigate the organization of gold nanocrystals on thin, fluid films consisting of polymer chains tethered by one end to an underlying substrate in a polymer brush configuration. The thickness of the polymer brush is comparable to the nanocrystal size. Thinner polymer brushes are found to suppress aggregation of…
Aligned nanowires of organic luminescent material were prepared by introducing the organic luminants into nanochannels of variable size in an anodic aluminum oxide (AAO) membrane, and the emission spectra from these nanowire arrays exhibited novel size-dependent luminescent properties.
Multiwalled carbon nanotubes and carbon nanorods were produced through a novel route in the presence of different metallic particle catalysts at the extremely low temperature of 200 °C. In this process, tetrachloroethylene (C 2 Cl 4 ) was used as the carbon feedstock, which can be reduced by metallic potassium to free…