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。
Normal and superconducting states of ${\text{BaNi}}_{2}{\text{P}}_{2}$ single crystals $({T}_{\text{C}}\ensuremath{\sim}2.4\text{ }\text{K})$ have been studied. Anisotropy of resistivity is comparable with that of upper critical fields, indicating the effective mass estimated in the normal state is nearly the same as…
We have investigated axial interactions of H(2) with Al(12)X (X = Mg, Al, and Si) clusters and found that homolytic dissociation leading to Al(12)XH and H atom proceeds without a barrier but is an extremely endothermic process. The calculated difference in energy of the addition and abstraction reactions indicates tha…
Percolative composites with significant dielectric properties have been synthesized from Ba0.8Sr0.2TiO3 matrix, Ag particles and a PbO-B2O3 glass dopant by a traditional ceramic method. Such composites possess a high dielectric constant (εr ∼ 24 000), which is stable with frequency and temperature, and very low loss (…
By molecular modeling we demonstrate that the nematic long-range order discovered in bent-core liquid-crystal systems should reveal further spatially homogeneous phases. Two of them are identified as a tetrahedratic nematic (N_{T}) phase with D_{2d} symmetry and a chiral tetrahedratic nematic (N_{T};{ *}) phase with D…
Abstract The first synthetic protocol for functionalizing the dihydroazulene (DHA) photoswitch in its seven‐membered ring has been developed. This protocol is based on regioselective bromination, followed by regioselective elimination of HBr, and finally a palladium‐catalyzed cross‐coupling reaction with a terminal al…
The synthesis of gold, palladium, and gold-palladium alloy nanoshells (approximately 15-20 nm thickness) was accomplished by the reduction of gold and palladium ions onto dielectric silica core particles (approximately 100 nm in diameter) seeded with small gold nanoparticles (approximately 2-3 nm in diameter). The siz…
A novel process, i.e., ultrasound-assisted membrane reduction, was introduced and applied to synthesize Ag and Au nanocrystals. High-resolution transmission electronic microscopy and UV−vis spectra were adopted to observe and study the resulting colloids. The nearly spherical Ag and Au nanoparticles with mean diameter…
Herein, we first review different methodologies that have been proposed for computing the quantum mechanical (QM) energy and other molecular properties of large systems through a linear combination of subsystem (fragment) energies, which can be computed using conventional QM packages. Particularly, we emphasize the si…
In the present work, the preparation of Au/In 2 O 3 −TiO 2 catalysts with loadings of 1, 6, and 12 wt % of In is reported. In 2 O 3 −TiO 2 supports prepared by the sol−gel method allow the formation of solids with high specific surface area. By means of the urea deposition−precipitation method, gold nanoparticles in t…
Specimen contamination induced by electron beam irradiation has long been a serious problem for high-resolution imaging and analysis by a transmission electron microscope (TEM). It creates a deposition of carbonaceous compounds on a region under study, causing the loss of resolution. We developed a method to reduce th…
The dynamic crystallization kinetics of polyphenylene sulfide (PPS) nanocomposites with inorganic fullerene WS2 nanopartices (IF-WS2) content varying from 0.05 to 8 wt % has been studied using differential scanning calorimetry (DSC). The analysis of the crystallization at different cooling rates demonstrates that the…
Metallic copper nanoparticles are produced by spray pyrolysis of copper nitrates with an addition of ethanol as cosolvent at 600 degrees C. Depending on the synthesis temperature, two interesting reaction pathways are found: below 525 degrees C, approximately 10% of hollow Cu(2)O parent particles are oxidized to CuO a…
A series of trinuclear copper(II) complexes of general formula A(6)[Cu(3)L(2)] x nH(2)O [L = benzene-1,3,5-tris(oxamate); A = Li(+) (n = 8), 1a; Na(+) (n = 11.5), 1b; and K(+) (n = 8.5), 1c] have been synthesized, and they have been structurally and magnetically characterized. X-ray diffraction on single crystals of 1…
Molecular movies: Time-resolved X-ray scattering provides direct structural information on an electronically excited complex while it is formed in the bimolecular reaction between excited octahydrogen[tetrakis-mu-diphosphito-1kappaP:2kappaP'-diplatinate](4-) (PtPOP*) and thallium ions. In the exciplex one thallium(I)…
Drug release from hyperbranched polymer-drug conjugates and the subsequent activity are influenced by the branching architecture and the linker. To gain an understanding of these effects, we used hyperbranched polyol and G4-OH polyamidoamine (PAMAM) dendrimer with methyl prednisolone (MP) as the model drug. The drug w…
Abstract A simple and general one‐pot synthesis for water‐soluble ligand‐coated ultra small paramagnetic or superparamagnetic metal oxide nanoparticles with average particle diameters ( d av. ) that range from 1–3 nm has been developed and used in molecular magnetic resonance (MR) imaging. The iron oxide, manganese ox…
Abstract Eight different types of novel polyurethanes (PUs) were synthesized through the polyaddition reaction of 4,4′‐(ethane‐1,2‐diylidenedinitrilo)diphenol and 4,4′‐(pentane‐1,5‐diylidenedinitrilo)diphenol with four different diisocyanates: 4,4′‐diphenylmethane diisocyanate, toluene 2,4‐diisocyanate, isophorone dii…
In this work, a facile surfactant-directed process is developed for controlling the morphology of ZnO with distinctive shapes ranging from mushrooms, bihemispheres, dumbbells, bilayer hexagonal disks and prisms to flower-like nanosheet aggregations. The flower-like aggregated nanosheets were formed by oriented attache…
The encapsulation of one material by another, to form core-shell particles (microcapsules), has many applications, principally the containment, protection, and distribution of an active material. This work describes the development of core-shell particles with silicone oil cores and solid silica-like shells of control…
Redox-active ferrocenyl-terminated dendrimers have been used to build robust and active interfaces in which the inherent properties of the dendrimers are preserved. The procedure is based on the preparation of a polyarylcarboxylate layer through the controlled reduction of aryldiazonium salts followed by strong adsorp…