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 effect of replacing Mn for Fe in the ferrimagnetic perovskite CaCu 3 Mn 4 O 12 has been studied in the series of nominal composition CaCu 3 (Mn 4− x Fe x )O 12 ( x = 0, 0.5, 1.0). These materials have been prepared in polycrystalline form under moderate pressure conditions of 2 GPa, in the presence of KClO 4 as ox…
The title compound contains layers built up from isolated BO3 triangles and MgO6 octahedra, interleaved with SrO9 polyhedra to form a three-dimensional framework. The Sr atom is nine-coordinate in a distorted tricapped trigonal prismatic geometry. Sr, B and one O atom have m point symmetry and Mg 2/m point symmetry.
Abstract The finite difference model is coupled with a cellular automaton (CA) model to simulate dendrite growth in TIG (tungsten inert‐gas) weld molten pool of nickel‐based alloys. Based on the macro finite difference computation of the thermal field of the whole weldment, the micro CA model is used to simulate grain…
Abstract A new solvated polyoxometallate bearing an amino acid, ( I ), has been prepared for the first time by the reaction of 0.16 mmol α‐H 4 SiW 12 O 40 .15H 2 O with 0.78 mmol of L‐proline in hydrochloric acid at pH 3. The structure of ( I ) was substantially characterized by some physical approaches, such as eleme…
Abstract New polyurethanes containing Y‐shaped chromophores, symmetrical derivatives of 4‐(dicyanomethylene)‐2‐methyl‐6‐[ p ‐(dimethylamino)styryl]‐4H‐pyran, have been prepared. The polymers show high glass transition temperatures ( T g ) and a good thermal stability. SHG measurements on poled polymer films of the syn…
Copper-doped ZnO (ZnO:Cu) films were prepared by the filtered cathodic vacuum arc technique at room temperature on Si substrates. The as-grown ZnO:Cu exhibited a saturated magnetic moment ( M s ) of 0.36 μ B /Cu at room temperature. After an annealing treatment at 500 °C for 1 h under N 2 O ambient, the M s of the ZnO…
A fluid of rod–coil diblock copolymers, modelled as wormlike chains, is treated by using self-consistent field theory. The 'rod' and 'coil' sections of each molecule are distinguished by their degrees of flexibility (or persistence lengths), but are otherwise identical. Interactions between molecules are taken to be o…
The dianionic NiN2S2 complex, Ni(ema)2-, ema=N,N'-ethylenebis-2-mercaptoacetamide, known as a reasonable model of the tripeptide complex Ni(CGC)2- (C=cysteine; G=glycine) with respect to the two carboxyamido nitrogens and cis-dithiolates in a (N2S2)4- ligand scaffold as found in acetyl CoA synthase, has been explored…
We have prepared different compositions in the Gd 2− y La y Zr 2 O 7 solid solution by mechanically milling stoichiometric mixtures of the corresponding oxides. Irrespective of their lanthanum content, as-prepared powder samples consist of single-phase anion-deficient fluorite materials, although the long-range orderi…
Abstract Novel biodegradable network films with elastic properties were prepared from trimesic acid (Y) and poly(ethylene glycol)s (PEGs) with different molecular weights (MW) and/or 4,7,10‐trioxa‐1,13‐tridecanediamine (I). Prepolymers prepared by a melt polycondensation were cast from N , N ′‐dimethylformamide soluti…
Stereochemical study of five 2-substituted N-vinylpyrroles obtained via the Trofimov reaction was carried out based on the experimental measurements of their 13C–1H and 13C–13C spin–spin coupling constants substantiated by the high-level ab initio calculations of the parent 2-methyl-N-vinylpyrrole. The title compounds…
Abstract A new family of 1D cooperative spin‐crossover polymers with general formula [{Fe(tba) 3 }X 2 ] · n H 2 O [tba = N ‐(4 H ‐1,2,4‐triazol‐4‐yl)benzamide; X = CF 3 SO 3 – , n = 2 ( 1 ), n = 0 ( 4 ); BF 4 – , n = 3 ( 2 ), n = 0 ( 5 ); 4‐CH 3 C 6 H 4 SO 3 – , n = 3 ( 3 ), n = 0 ( 6 )] has been synthesised and chara…
Atomistic molecular dynamics simulation and a simple continuum viscous flow model are employed to investigate the sintering of straight-chain nanoparticle aggregates. The results are used to develop a phenomenological sintering scaling law. The chain aggregates investigated consist of up to 80 primary particles of sil…
Multiple Stokes and anti-Stokes generation in the monoclinic tungstate MnWO 4 was observed under one-micron picosecond excitation. All the recorded Raman induced laser lines were identified and attributed to the SRS-promoted vibration mode (at ≈ 879 cm -1 ) of the crystal.
In the Santa Cruz and Chubut provinces, Patagonia, Argentina, kaolin deposits were formed by “in situ” alteration of volcaniclastic rocks, such as the Bajo Grande, Chon Aike or Marifil Formations, or by erosion, transportation, and deposition of residual clays in small basins. This paper describes the genesis; geology…
We report using poly(acrylamide-co-2-(dimethylamino)ethyl methacrylate, methyl chloride quaternized) cationic microgels as a porous colloidal template for biomimetic in situ silica mineralization, allowing the well-controlled synthesis of submicrometer-sized hybrid microgel--silica particles and porous silica particle…
Vascular smooth muscle cells (vSMCs) can switch between a contractile (differentiated) and a synthetic (dedifferentiated) phenotype. Synthetic, proliferative vSMCs are observed during embryogenesis, wound repair, and tissue engineering. The potential of isolated vSMCs to reverse this phenotypic modulation depends stri…
We apply elastic continuum theory to model critical parameters influencing the free-energy equilibrium configuration and the dynamic performance of a continuous and in-plane liquid crystal profile acting as a polarization grating. We present analytical expressions for the threshold voltage, critical thickness, and the…
Various sequences of single and double stranded DNA can wrap and colloidally stabilize single- walled carbon nanotubes in solution. The binding of divalent ions to these complexes results in a 10 meV emission energy red-shift of the photoluminescence of the nanotube. In this work, this optical modulation is linked to…
Abstract This work describes the interaction of alkaline, alkaline earth, transition metal, heavy metal, and lanthanide cations from nitrate solutions with synthetic polyamides. The polyamides have pendant structures acting as cation host moieties. The host subgroups are benzo‐12‐crown‐4, benzo‐15‐crown‐5, benzo‐18‐cr…