Materials Literature
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The metal-based emission of a series of luminescent europium and terbium complexes incorporating an aromatic chromophore is rendered pH-dependent either through perturbation of the aryl singlet or triplet energy or by modulating the degree of quenching of the lanthanide excited state. Systems exhibiting each of these…
Mesoporous semiconducting films consisting of preferentially orientated monoclinic-phase nanocrystals of tungsten trioxide have been prepared using a novel version of the sol-gel method. Transformations undergone by a colloidal solution of tungstic acid, stabilized by an organic additive such as poly(ethylene glycol)…
The crystal structure of borophosphates ABPO 5 (A = alkaline earth or Pb) was resolved on a polycrystalline sample using the Rietveld method. The x-ray diffraction patterns data show that ABPO 5 crystallize in a centrosymmetric space group P3 1 21 and their structure is related to the borogermanates REBGeO 5 with a st…
Abstract The crystallization kinetics and morphologies of dilute binary blends of the monodisperse alkane n ‐C 122 H 246 in n ‐C 246 H 494 and vice versa have been investigated. With a molecular length ratio close to two, this pair of n ‐alkanes does not produce permanent cilia when once‐folded C 246 H 494 molecules c…
We present and analyse high-resolution absorption, luminescence and upconversion-luminescence spectra of Cs 2 GeF 6 : 2% Re 4+ . The crystals of Cs 2 GeF 6 : 2% Re 4+ were grown from solution. Upon excitation around 11 000 cm −1 in the near infrared, visible upconversion luminescence around 17 000 cm −1 is observed. O…
The phase transition of ferroelectrics is one of their most important bulk-nature attributes. In well-epitaxial ferroelectric thin films, the crystal structures are highly strained and the ferroelectric phase transitions tend to dissappear because of an epitaxial effect. We investigated the epitaxial effect by structu…
In this paper, our work is focused on the fundamental combustion characteristics of the combustibles in MSW and its kinetic model. The combustion reactivity of the different combustibles in MSW and their mixtures such as TG and DTA profiles were studied by thermogravimetry (TG) and differential thermal analysis (DTA).…
A brief review is given of the Post symmetries and constraint for covariant electromagnetic constitutive relations which are linear in the fields E and B . Their extension to non-covariant constitutive relations which are linear also in space and time derivatives of E and B is discussed. The Post constraint is compare…
The segregation effects of Nb and V on bcc FeSigma3[110](111) grain boundary cohesion are studied by the first-principles DMol method within the framework of density functional theory. The calculated segregation energy difference between the grain boundary and the corresponding free surface is -0.51 eV (-0.58 eV) for…
Three cyano-bridged bimetallic assemblies, [NiL(1)](3)[Cr(CN)(6)](2).7H(2)O (1), [NiL(2)](3)[Cr(CN)(6)](2).9H(2)O (2), and [NiL(2)](3)[Cr(CN)(5)(NO)](2).9H(2)O (3) (L(1) = 3,10-dimethyl-1,3,5,8,10,12-hexaazacycloctadecane and L(2) = 3,10-diethyl-1,3,5,8,10,12-hexaazacycloctadecane), have been prepared and characterize…
We study the kinetics of the release of monodisperse water-in-oil-in-water double emulsions in the regime dominated by coalescence of the internal aqueous droplets onto the globule interface. By measuring the rate of release of adsorbed droplets, we directly determine the average lifetime of the thin film that forms b…
[structure: see text]. In the stoichiometric asymmetric epoxidation of E-beta-methylstyrene with cationic chromium-salen oxo complexes, enantioselectivity is increased by halo-substitution at the 3,3'- and 6,6'-positions and decreased at the 4,4'- and 5,5'-positions on the salen rings. Addition of triphenylphosphine o…
NbS2 nanotubes/rods have been generated successfully employing carbon nanotube template promoted growth; high resolution transmission electron microscopy, coupled with EDX analysis, confirm the template effect and existence of NbS2 tube structures.
The adsorption of 1/3 monolayer of the group-III elements B, Al, Ga, and In on a Si-terminated $\mathrm{SiC}(111)\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}\mathrm{R}30\ifmmode^\circ\else\textdegree\fi{}$ surface is investigated in dependence on the surface preparation conditions using the density functional th…
Abstract The intermolecular hydrogen‐bonding interaction and miscibility between enzymatically prepared novel polyphenols [poly(bisphenol A) and poly( p ‐ tert ‐butyl phenol)] and poly(ε‐caprolactone) (PCL) were investigated as a function of composition by Fourier transform infrared spectroscopy (FTIR) and DSC. The bl…
Abstract Three new bis(ether‐acyl chloride) monomers, 1,1‐bis[4‐(4‐chloroformylphenoxy)phenyl]cyclohexane ( 1a ), 5,5‐bis[4‐(4‐chloroformylphenoxy)phenyl]‐4,7‐methanohexahydroindan ( 1b ), and 9,9‐bis[4‐(4‐chloroformylphenoxy)phenyl]fluorene ( 1c ), were synthesized from readily available compounds. Aromatic polybenzo…
Transport of Na + and Li + under the influence of an electric field in twinned quartz is simulated using molecular dynamics techniques. Comparison between bulk transport and transport along twin boundaries shows that the cations are trapped inside twin walls for weak fields along the crystallographic c -axis. Stronger…
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The crystal structure of a hydrated crystal of bis(squaryl)biphenyl (BSQB*4H2O), in which two squaric acid moieties are connected with a 4,4'-biphenyl unit, was characterized by the presence of a one-dimensional hydrogen-bonded chain composed of BSQB and water molecules. X-ray crystallographic analysis showed that BSQ…
Magnetic domain walls in ferromagnetic ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ films ${(T}_{C}\ensuremath{\sim}260\mathrm{K})$ have been studied in the transmission electron microscope. Epitaxial films grown on ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{NdGaO}}_{3}$ substrates were prepared using a focuse…