Materials Literature
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A range of discoid species with benzene or triazine cores and three (trialkoxyaryl)oxadiazole arms have been synthesized. 1,3,5-tris{5-[3,4,5-tris(octyloxy)phenyl]-1,3,4-oxadiazol-2-yl}benzene has been studied in detail; it exhibits a columnar discotic liquid-crystalline mesophase between 38 and about 210 °C. The time…
This paper explores the size effect of zirconia particles on the catalysis of Ni metal for CO 2 re-forming of methane. It is revealed for the first time that when the sizes of zirconia particles become samller than 25 nm, the oxide forms nanocomposite catalysts with size-comparable Ni-metal nanocrystals (10−15 nm). Th…
The transformation of amorphous colloidal calcium carbonate into single microcrystals was observed in supersaturated solutions in situ. The observations are done by simultaneous time-resolved small-angle and wide-angle X-ray scattering experiments (TR-SAXS/WAXS) at a third generation synchrotron source. TR-SAXS/WAXS d…
The effect of polymer charge density, polyelectrolyte concentration, and ionic strength on the formation of multilayer films by sequential adsorption of a polyanion (poly(styrene sulfonate), PSS) and a cationic statistical copolymer poly(diallyl-dimethyl-ammoniumchloride- stat - N -methyl- N -vinylacetamide), P(DADMAC…
The synthesis of 1,4-bis(9,9'-bis(3"-(N,N,N-trimethylammonium)-propyl)-2'-fluorenyl)benzene tetrabromide (C3), 1,4-bis(9,9'-bis(4"-(N,N,N-trimethylammonium)-butyl)-2'-fluorenyl)benzene tetrabromide (C4), 1,4-bis(9,9'-bis(6"-(N,N,N-trimethylammonium)-hexyl)-2'-fluorenyl)benzene tetrabromide (C6), and 1,4-bis(9,9'-bis(8…
We describe the efficient impregnation of Pt nanoparticles (OD < 3 nm) on cup-stacked-type carbon nanofibers. The method involves the dispersion of the fibers in H 2 PtCl 6 followed by low-temperature annealing. The Pt particle deposition is always homogeneous and can be controlled selectively on the outer or internal…
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…