Materials Literature
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Structural characteristics of ceria−titania and vanadia/ceria−titania mixed oxides have been investigated using X-ray powder diffraction (XRD), Raman spectroscopy (RS), and X-ray photoelectron spectroscopy (XPS) techniques. The (1:1 mole ratio) mixed oxide was obtained by a coprecipitation method, and a nominal 5 wt %…
Terbium triborate, TbB3O6, is confirmed to adopt at least two different structural modifications. Its monoclinic modification represents the terminal member of the isostructural series of REB3O6 with RE = La–Tb, and crystallizes in space group I2/a. The structure consists of chains of [B6O12]n6− building units, that r…
[(PW(11)O(39))(2)(Mo(4)S(4)O(4)(OH(2))(2))](10-) anions were obtained through the stereospecific addition of the [Mo(2)S(2)O(2)](2+) oxothiocation to the monovacant alpha-[PW(11)O(39)](7-) anion. K(10)[(PW(11)O(39))(2)(Mo(4)S(4)O(4)(OH(2))(2))].25H(2)O has been isolated as crystals and characterized by X-ray diffracti…
Based on the relationship between the power-law exponent and relaxation time ν(τ) recently established in Ryabov et al (2002 J. Chem. Phys. 116 8610) for non-exponential relaxation in disordered systems and conventional Arrhenius temperature dependence for relaxation time, it becomes possible to derive the empirical V…
Radiation and thermally induced changes in the oxidation state of uranium in metamict zircon have been systematically analysed, for the first time, using polarized near-infrared spectroscopy. The results showed that in damaged zircon U ions in crystalline domains exhibited relatively sharp, anisotropic signals from te…
Mapping an uncharted territory: The good correlation between experimental and calculated 183W NMR chemical shifts of polyoxotungstates (see picture) may allow the prediction and assignment of the spectra of unstable or unknown species, and also allow the counterion effect to be addressed.
Carbon nanocapsules with an average diameter of ca. 15 nm were fabricated by the carbonization of PMMA/PDVB core/shell nanoparticles, which were prepared by redox microemulsion polymerization. When the core/shell nanomaterial was carbonized, the PMMA core was eliminated, and the PDVB shell was transformed into a carbo…
Single polypropylene microfibers plasma-coated with polymers of different surface charge [N,N-dimethylaminoethyl methacrylate (NN) (positive charge), methacrylic acid (MA) (negative charge), and hexafluoropropylene (HF) (neutral)] were implanted in the subcutaneous dorsum of Sprague-Dawley rats for 5-week intervals. T…
Depletion-driven changes in the structure of hard-sphere particles (radius R ) mixed with a nonadsorbing polymer (radius of gyration R g ) dissolved in good (athermal) and ideal (theta) solvents are systematically studied. Colloidal structure factors, S ( q ), are determined using slit-smeared and pinhole-collimated u…
We have prepared poly(imide siloxane) (PIS) films having various siloxane contents using a two-step polymerization technique and subjected them to a UV/ozone treatment using UV excitation in the range λ = 185−254 nm to form an SiO x layer on the surface of the PIS films. From electron spectroscopy chemical analysis (E…
A sheared wet foam, which stores elastic energy in bubble deformations, relaxes stress through bubble rearrangements. The intermittency of bubble rearrangements in the foam leads to effectively stochastic drops in stress that are followed by periods of elastic increase. We investigate global characteristics of highly…
In this paper, we report on the successful preparation and characterization of large Au colloidal crystals using hydrophilic Au nanoparticles as the building units in bulk aqueous solution. Scanning electron microscopy observation shows that the Au colloidal crystals have a clear crystal appearance and well-developed…
The chemical preparation, crystal structure, and infrared absorption spectrum are given for a new cyclotetraphosphate, KGdP 4 O 12 . X-ray investigations showed that the newly synthesized compound crystallizes in a monoclinic structure, space group C 2/ c with the following unit-cell dimensions: a = 7.875(1), b = 12.4…
A series of poly( m -methylene 2,6-naphthalate- co -1,4-cyclohexylenedimethylene 2,6-naphthalate) copolymers were synthesized, and their crystallization behavior was investigated using differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). Poly(ethylene 2,6-naphthalate- co -1,4-cyclohexylened…
The dynamics of hairy spherical nanoparticles in a melt of linear polymer chains has been investigated by mechanical spectroscopy as a function of particle topology and concentration. Using a simple free volume approach for the data analysis of the structural relaxation time vs concentration and the well-known hard-sp…
To examine the effects of connectivity among pores of almost the same size and of different size and geometry on adsorption hysteresis and pore criticality, we measured the temperature dependence of the adsorption−desorption isotherm of nitrogen onto MCM-48 and SBA-16 materials, respectively, with well-defined three-d…
A new Cu(II) complex, [Cu(3)(dcp)(2)(H(2)O)(4)](n), with the ligand 3,5-pyrazoledicarboxylic acid monohydrate (H(3)dcp) has been prepared by hydrothermal synthesis, and it crystallizes in the monoclinic space group P2(1)/c with a = 11.633(2) A, b = 9.6005(14) A, c = 6.9230(17) A, beta = 106.01(2) degrees, and Z = 2. I…
We report the identification of the nitrogen-vacancy-hydrogen complex in a freestanding nitrogen-doped isotopically engineered single crystal diamond synthesized by chemical vapor deposition. The hydrogen atom is located in the vacancy of a nearest-neighbor nitrogen-vacancy defect and appears to be bonded to the nitro…
The g(zz) values of ESR spectra of superoxide (O(2)(.-) complexes of metal ion salts acting as Lewis acids with different ligands and counterions were determined in acetonitrile at 143 K. The binding energies (DeltaE) of (O(2)(.-)/Lewis acid complexes have been evaluated from deviation of the g(zz) values from the fre…
A study of the changes in the symmetry of the metal coordination sphere that accompany spin crossover transitions has been carried out. Changes in symmetry have been calibrated by using the continuous symmetry measures approach. Different behaviors have been found for several families of complexes, depending on the na…