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。
Cobalt-doped ZnO (Co2+:ZnO) films were studied by magnetic circular dichroism (MCD) spectroscopy. A broad 300 K ferromagnetic MCD signal was observed between 1.4 and 4.0 eV after introducing shallow donor states by exposure of paramagnetic Co2+:ZnO films to zinc vapor. The new sub-bandgap ferromagnetic MCD intensity i…
We study the influence of structural lattice fluctuations on the elastic electron transport in single-wall carbon nanotubes within a density-functional-based scheme. In the linear-response regime, the linear conductance is calculated via configurational averages over the distorted lattice. Results obtained from a froz…
We study triangular lattice spin-$1∕2$ system with antiferromagnetic Heisenberg and ring exchanges using variational approach focusing on possible realization of spin-liquid states. Trial spin liquid wave functions are obtained by Gutzwiller projection of fermionic mean-field states and their energetics is compared ag…
Structural and magnetic transformations in the Heusler-based system ${\mathrm{Ni}}_{0.50}{\mathrm{Mn}}_{0.50\ensuremath{-}x}{\mathrm{Sn}}_{x}$ are studied by x-ray diffraction, optical microscopy, differential scanning calorimetry, and magnetization. The structural transformations are of austenitic-martensitic charact…
Abstract The wavelength dependence of the third‐order optical nonlinearity and response of the J‐like aggregates of a cyanine dye called NK‐3261 in a neat film were measured by the femtosecond degenerate four‐wave mixing (DFWM) technique under resonant conditions. The temporal profile of the DFWM signal of NK‐3261 J‐l…
Abstract New asymmetric (salen)Mn III and UO 2 complexes containing a calix[4]arene unit in the ligand framework were synthesized. The UO 2 complexes were characterized by 1 H‐, 13 C‐, 2D TOCSY and T‐ROESY NMR spectroscopy. Furthermore, the structure of one UO 2 complex was determined by single‐crystal X‐ray analysis.…
Abstract The synthesis and the nonlinear optical properties of an axially substituted binuclear InCl/InCl phthalocyanine 1 with an unsymmetrical substitution pattern are described. The preparation of this new type of binuclear phthalocyanine has been carried out through a multi‐step synthetic strategy, which was speci…
Abstract Monodisperse spherical ZrO 2 particles were prepared by controlled hydrolysis of zirconium tetraalkoxide in alcoholic solution. Ageing the reaction solution at 60 °C for 4 h yields particles with sizes in the range between 200 and 2000 nm. The influence of various ions and surfactants on the final product was…
Phase-field models are very attractive in view of their numerical simplicity. With only a few lines of code, one can model complex physical situations such as dendritic growth. From this point of view, they constitute very interesting tools for teaching purposes at graduate level. The main difficulty with these models…
Abstract Summary: Polypyrrole (PPy), polyaniline (PANI), and poly(ethylenedioxythiophene) (PEDOT) aqueous dispersions were prepared by polymerizing the corresponding monomer in the presence of a polymeric ionic liquid (PIL), poly(1‐vinyl‐3‐ethylimidazolium bromide). By addition of bispentafluoroethanesulfonimide lithi…
Abstract The hydrothermal reaction of an aqueous ammonium heptamolybdate solution with first‐row transition metal salts in the presence of 2‐aminopyridine at around 180 °C and under autogenous pressure yields several molybdates, such as the 1D chains in (C 5 N 2 H 7 ) 4 Mo 8 O 26 ( 1 ), zero‐dimensional (C 5 N 2 H 7 )…
Single crystals of the filled-skutterudite compound NdOs$_4$Sb$_{12}$ have been investigated by means of electrical resistivity, magnetization, and specific heat measurements. The NdOs$_4$Sb$_{12}$ crystals have the LaFe$_4$P$_{12}$-type cubic structure with a lattice parameter of 9.3 Å. Possible heavy-fermion behavio…
In the present study, La-doped MgB_2 superconductors with different doping level (Mg1-xLaxB2; x=0.00, 0.01, 0.03 & 0.05) have been synthesized by solid-state reaction route at ambient pressure. Effect of La doping have been investigated in relation to microstructural characteristics and superconducting properties, par…
The two-phase (space groups $Cc$ and $Cm$) structural model recently proposed for the modeling of the neutron powder diffaction pattern collected on Pb(Zr$_x$Ti$_{1-x}$)O$_3$ (PZT) sample with $x\approx 0.52$ [R. Ranjan, A. K. Singh, Ragini, and D. Pandey. \textit{Phys. Rev. B} \textbf{71}, 092101 (2005)] is shown to…
Abstract Over the past years, the gelation of aqueous solutions by low molecular weight (LMW) compounds has become an area of increasing interest, owing to developments in the field of LMW organogelators. Until recently, LMW hydrogelators were found only by serendipity, nowadays rational design as well as application…
Poly(lactide)s [i.e. poly(lactic acid) (PLA)] and lactide copolymers are biodegradable, compostable, producible from renewable resources, and nontoxic to the human body and the environment. They have been used as biomedical materials for tissue regeneration, matrices for drug delivery systems, and alternatives for com…
Molecular dynamics simulations were performed to study thermal stabilization of proteins via electrostatic interactions of ion pairs. Dynamic motions of four ion pairs previously proposed to be important in thermal stability of adenylate kinase from the thermophile Bacillus stearothermophilus were monitored during the…
The influence of the hydrodynamic effects of fluid flow on the hydrothermal deposition of 〈001〉 oriented epitaxial Pb(Zr 0.7 Ti 0.3 )O 3 (PZT) thin films onto single-crystal SrTiO 3 (100) substrates was investigated. The films were grown at 150 °C from lead acetate, zirconyl chloride, and titanium dioxide precursors a…
Thermoresponsive, pH-sensitive fibrous structures and gels are formed in aqueous mixtures of the amino acid lysine with oppositely charged sodium alkyl sulfate surfactants. The formation of these assemblies depends on the chain length of the surfactant, which is varied between 8 and 16, the chirality and degree of pro…
Experiments using nickel magnetostrictive oscillators as transducers that generate acoustic standing waves in a bubble column were conducted in this study. The acoustic frequencies employed are 16 and 20 kHz with power up to 400 W. The column is operated at a constant room temperature, with the heat generated from aco…