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 catalytic cracking of blends made up of polystyrene and polystyrene−butadiene with a light cycle oil (refinery stream) has been studied under the standard conditions of a FCC process. The catalysts used have been prepared based on HY zeolites of different acidity and porous structure. The results reveal the intere…
Stable cyclotriphosphazenes 5 and 6, with three and four carbon radical centers, have been prepared by condensation of (4-hydroxy-2,6-dichlorophenyl)bis(2,4,6-trichlorophenyl)methyl radical (4) with tetrachloro-2,2'-dioxybiphenylcyclotriphosphazene (7). EPR studies of both polyradicals in fluid solution suggest an ele…
Abstract Several, novel polyimide–polyurethane‐urea‐imide (PI‐PUI) copolymers with different polyimide (PI) contents were prepared by an in situ interpenetrating reaction between polyurethane‐urea‐imide (PUI) precursor and poly(amide acid). Changing the ratio of the PUI precursor and poly(amide acid) resulted in a cha…
Starch graft poly(methyl acrylate) (S-g-PMA) was prepared by ceric ion initiation of methyl acrylate in an aqueous corn starch slurry (prime starch) which maximized the accessibility of the starch for graft polymerization. A new ceric ion reaction sequence was established as starch-initiator-methyl acrylate followed b…
The molecular weight dependence of zero-shear viscosity (η 0 ) of polystyrene- block -polyisoprene (SI diblock) copolymer in the disordered state was investigated. For the investigation, a series of lamella-forming, nearly monodisperse SI diblock copolymers were synthesized via sequential anionic polymerization, and o…
The protein kinase family is a prime target for therapeutic agents, since unregulated protein kinase activities are linked to myriad diseases. Balanol, a fungal metabolite consisting of four rings, potently inhibits Ser/Thr protein kinases and can be modified to yield potent inhibitors that are selective-characteristi…
New power generation technologies are expected to reduce various environmental impacts of providing electricity to urban regions for some investment cost. Determining which power generation technologies are most suitable for meeting the demand of a particular region requires analysis of tradeoffs between costs and env…
Beamsplitting polarizer cubes consisting of two right angle prisms cemented together after one hypotenuse is coated have become important optical components in many optical systems. Usually the coating stack is of the MacNeille design. We present and compare an alternative coating structure consisting of a very fine w…
Abstract The effects of heat treatment below the melting point of 3,9‐bis{1,1‐dimethyl‐2[β‐(3‐ tert ‐butyl‐4‐hydroxy‐5‐methylphenyl)propionyloxy]ethyl}‐2,4,8,10‐tetraoxaspiro[5,5]‐undecane (AO‐80) on the thermal and dynamic mechanical properties and microstructure of chlorinated polyethylene (CPE) filled with vitrifie…
A convergent beam electron diffraction (CBED) study of Bi 2 La 2 Ti 3 O 12 was performed. As in the case of Bi 3 LaTi 3 O 12, it reveals a lowering of symmetry with respect to the idealized structure (space group I 4/ mmm ) of Aurivillius phases. The structure of Bi 4 - x La x Ti 3 O 12 ( x = 1 and 2) compounds has be…
A combination of experiments and theoretical calculations is used to develop an atomic-scale model of the grain boundary potential in perovskite oxides. More specifically, pristine $8\ifmmode^\circ\else\textdegree\fi{}$ and $58\ifmmode^\circ\else\textdegree\fi{}$ $[001]$ tilt grain boundaries in ${\mathrm{SrTiO}}_{3},…
Glass beads were modified with vinyl triethoxyl silane (VTES) followed by in situ copolymerization with styrene (St) and by direct modification with St via in situ polymerization. It was seen that the presence of glass beads did not inhibit the polymerization of St, and FT-IR spectra confirmed that the polystyrene (PS…
First-principles plane-wave pseudopotential calculations were performed to study electronic structures, structural relaxation, and energetics of point defects in Ti-doped ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}.$ Substitutional and interstitial Ti ions with charge compensating intrinsic defects were considered, and their f…
Nanoshells have been previously shown to have tunable absorption frequencies that are dependent on the ratio of their inner and outer radii. Inspired by this, we ask: can a nanoshell increase the absorption of a small core system embedded within it? A theoretical model is constructed to answer this question. A core, c…
In this work, we used the molten chalcogenide flux synthetic method to form an analogous series of alkali samarium selenogermanates, with the general formula ASmGeSe(4) (A = K, Rb, Cs). Using a constant reactant stoichiometry, we relate the monoclinic KLaGeSe(4) structure type to the orthorhombic CsSmGeS(4) structure…
In this study, Pd −Mo alloys have been internally oxidized to form Pd/MoO 3 composites, and it is shown for the first time that H 2 reacts with these composites to form H-bronzes, for example, H x MoO 3, within the Pd matrix. The Pd matrix is the source of mobile H atoms, which react with the oxide precipitates to for…
The segregation of Cr at the Fe-Cr alloy surface is essential in the formation of a thin, corrosion-resistant oxide film. Recent angle-resolved x-ray photoelectron spectroscopy measurements indicated Cr segregation at a high temperature in vacuum. However, two independent ab initio density functional theory calculatio…
Small-angle X-ray scattering (SAXS) was used to measure the time-dependent evolution of the size and size distribution of tetraoctylammonium-stabilized gold nanocrystals formed by arrested precipitation. The initial growth mechanism was varied by controlling the addition of reducing agent to the ionic gold precursor s…
We study here the adsorption of hexane on nanoporous MCM-41 silica at 303,313, and 323 K, for various pore diameters between 2.40 and 4.24 nm. Adsorption equilibria, measured thermogravimetrically, show that all the isotherms, that are somewhat akin to those of type V, exhibit remarkably sharp capillary adsorption pha…
The novel heteropolyanion [Cu(4)K(2)(H(2)O)(8)(alpha-AsW(9)O(33))(2)](8)(-) (1) has been synthesized and characterized by IR spectroscopy, elemental analysis, and magnetic studies. Single-crystal X-ray analysis was carried out on [K(7)Na[Cu(4)K(2)(H(2)O)(6)(alpha-AsW(9)O(33))(2)].5.5H(2)O](n)(K(7)Na-1), which crystall…