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 influence of molybdenum and nitrogen on passivation of the nickel-bearing austenitic stainless steels (SS) Fe-20% Cr-20% Ni, Fe-20% Cr-20% Ni-6% Mo, and Fe-20% Cr-20% Ni-6% Mo-0.2% N in deaerated 0.1 M hydrochloric acid (HCl) +0.4 M sodium chloride (NaCl) was investigated using electrochemical and x-ray photoelect…
The aggregation characteristics of aqueous solutions of a positively charged nitroxide surfactant (CAT16) in the presence and absence of half-generation polyamidoamine starburst dendrimers ( n .5-SBDs) have been investigated by electron paramagnetic resonance (EPR). Computer simulation of the EPR spectra allowed the c…
The reaction of aqueous solutions of K 2 PdCl 4 and K 3 Co(CN) 6 results in gellike polymeric materials, characterized by bridging cyanides between the central metals of the adducts. These materials tend to be rigid in nature but contain in excess of 95% water by weight. We refer to these novel transition metal based…
An Sn-substituted mesoporous silica molecular sieve (SN–HMS), prepared by neutral amine surfactant assembly of silicon and tin(IV) alkoxide precursors at ambient temperature, shows exceptional promise for producing poly(L-lactic acid) with polydispersity values near 1.1.
The surface compositions of La0.8Sr0.2BO3 (B = Cr, Mn, Fe, Co or Y) were investigated by X-ray photoelectron spectroscopy (XPS). Among the five solid oxide solutions, the yttrium showed the highest concentration in the surface atomic ratio [B-ion(La + Sr)]. Furthermore, the O1s spectra characteristics of yttrium perov…
The theoretical analysis of the steady-state amperometric response for a polymer-modified electrode system whcih exhibits Michaelis–Menten kinetics is discussed. In particular, the interplay between substrate diffusion within the polymer matrix and substrate reaction at the catalytic polymer sites is examined. A non-l…
The practical application of Pockels voltage and field sensors to electric power networks is expected to continue to increase not only in Japan but also throughout the world, with the introduction of optical telecommunication technology.
Ultradispersed diamond (UDD) powder prepared by explosive detonation and modified by hydrogen, plasma-ionized hydrogen, nitrogen, methane and air, as well as in vacuo, under different temperatures is investigated by Fourier-transform infrared spectroscopy (FTIR) and temperature programmed desorption (TPD) methods. Aft…
Constant energy molecular dynamics simulations of silicon cluster growth have been conducted for clusters up to 480 atoms using the Stillinger−Weber empirical interatomic potential. It is found that the interior atoms of the 480-atom clusters, at the temperatures used, show bulklike characteristics. The cluster bindin…
Previous work on the hydrocracking and hydroisomerization of alkanes over metal-impregnated anion-modified zirconium oxides (AZOs) is extended to long-chain alkanes, from n -heptane to high molecular weight polyolefins, using ZrO 2 modified by anion-derived groups such as SO 4 and WO 3 and promoted with hydrogenation…
Static and dynamic polarized and depolarized light scattering characterization of dilute solutions of regioregular poly(3-dodecylthiophene) is described to study intermolecular association as a function of the thermal history of the solutions. It is shown that metastable aggregation obtains under all of the conditions…
This study shows the ESR spectra of oxoiron(IV) porphyrin pi-cation radicals of 1-8 in dichloromethane-methanol (5:1) mixture. We reported in a previous paper that oxoiron(IV) porphyrin pi-cation radicals of 1-4 are in an a(1u) radical state while those of 5-8 are in an a(2u) radical. The ESR spectra (g( perpendicular…
Linear ligands containing a sequence of three bipyridine B and terpyridine T units form homo- or hetero-nuclear duplex helicates with CuI, CuII and FeII ions; of particular interest is the case of a [(BTB)CuIICuIICuII(TBT)] combination which amounts to the translation of one strand into the other one by virtue of the…
In this paper, we describe the investigation of chemical vapor deposition (CVD) of carbon from benzene and cyclohexane on a particular pitch-based active carbon fiber (ACF) at different deposition temperatures as a means of controlling the pore size of ACF in order to induce true molecular sieving capability and to di…
MCM-41 samples of various pore dimensions are synthesized. Plotting of nitrogen adsorption data at 77 K versus the statistical film thickness (comparison plot) reveals three distinct stages, with a characteristic of two points of inflection. The steep intermediate stage caused by capillary condensation occurred in the…
Both an asymptotic analytical analysis for chain length N → ∞ and exact numerical calculations for finite chain lengths were applied to the structural properties of polyelectrolyte brushes under poor solvent conditions in a self-consistent field framework. We extend previous work on polyelectrolyte brushes and find ev…
SUMMARYThis paper examines some of the problems associated with the replacement of cadmium plating for the protection of aircraft components and fasteners manufactured from steel. It reviews the range of coatings which are available commercially and are currently being considered as alternatives to cadmium plating. Re…
Nominally pure SrTiO3 has been studied by dielectric spectroscopy using small (linear regime) as well as large electrical fields (non-linear regime) up to 1 kV mm−1. In addition measurements of the specific heat and its field-dependent contribution have been carried out. The field dependence of the dielectric constant…
Poly(ethylene glycol) of M n 200 g/mol (PEG-200) was added to cultivation media of Alcaligines eutrophus during polymer formation, and the carbon source used was 4-hydroxybutyrate. The addition of PEG-200 from 0 to 2 wt % resulted in increased 4-hydroxybutyrate (4HB) incorporation from 66 to 86 mol % into the poly(3-h…
Reaction of Ti(OBut)4 with about 1 equivalent of water in tert-butyl alcohol for 5 d at 100 °C yielded the polytitanate complex [Ti18O28H][OBut]17. A single-crystal X-ray diffraction study of its ButOH solvate [a= 15.789(4), b= 29.544(5), c= 27.496(5)Å, β= 91.85(5)°; Z= 4; space group P21/c–C2h5] revealed a Ti18O45 me…