Fluorination of the ε-Keggin Al 13 polycation
Fluorination of the Al13 polycation in epsilon-Keggin (Kepsilon-J) conformation, leads to partial substitution of di-mu2-OH bridges by fluorine and enhances the formation of Al30 polycation.
Materials Literature
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Thermal Stability and Structure of Ge-Sb-S Glasses
Sb-S binary glass samples with a batch composition of Sb33.3S66.7 could be obtained by a melt-quenching method using a vacuum-sealed silica ampoule. The glass transition temperature of Sb33.3S66.7 glass was 163°C. Two series of Ge-Sb-S ternary glasses, namely GeS2-SbS1.5 and GeS2-SbS2 were also prepared. The Ge-Sb-S g…
Mechanical activation of precursors for nanocrystalline materials
Abstract Nanostructured materials win big scientific interest and increasingly economic meaning through their specific exceptional properties. Precursors that were compacted by pressing and sintering are normally used preparation of materials. In present work, the influence of mechanical activation by grinding on the…
Magnetic properties of phosphate-bridged copper( ii ) organic–inorganic hybrid compounds
Hydrothermal synthesis has allowed us to isolate and characterize three new inorganic–organic hybrid materials, the compounds [Cu2(phen)2(H2O)2(H2PO4)2](NO3)2·2H2O (1), [(Cu2bipy2)2(V4O9)(PO4)2(HPO4)(H2P2O7)]n·nH2O (2) and [Cu2(dpa)2(V2P2O12)]n, (4), which have been magneto-structurally characterized. In addition, the…
Three-dimensional Microstructure Fabrication with Aluminum Anodizing, Laser Irradiation, and Electrodeposition
Three-dimensional microstructures made of Ni metal or acrylic resin were fabricated by five sequential processes: porous anodic oxide film formation, pore sealing, laser irradiation, Ni electroplating or electrophoretic deposition of acrylic resin, and removal of the aluminum substrate and anodic oxide films. Cylindri…
Theoretical Analysis of IS of Polycrystalline Materials with Blocking or Conducting Grain Boundaries: From Microcrystals to Nanocrystals
Impedance spectra (IS) of a polycrystalline sample with macroscopic dimensions are analyzed based on the brick layer model with parallel and series grain boundaries (gb). The gb width is taken as 0.5 nm, in accordance with the classical Fisher model of gb diffusion. Three mean grain size values of 500, 50, and 5 nm ar…
Melting in Microgravity
The Isothermal Dendritic Growth Experiment constituted a series of three NASA-supported microgravity experiments (USMP-2, -3, and -4), which flew aboard the space shuttle Columbia. These space flight experiments grew and recorded dendrites in the absence of gravity-induced convective heat transfer. USMP-4, for the fir…
Microstructures and Thermal Fatigue Behavior of Cr-Ni-Mo Hot Work Die Steel Modified by Rare Earth
The near-net-shape casting technology is an important process unattainable with traditional die-making processes. The key of this process is how to guarantee the safety application of dies. In this paper, the microstructures and thermal fatigue (TF) behavior of Cr-Ni-Mo hot work die steel modified by rare earth (RE) w…
Ordered phases in alkali redistribution during a catalytic surface reaction
Reaction fronts in the O2 + H2 reaction on a Rh(110) surface predosed with potassium have been shown to be associated with a redistribution of the potassium from the oxygen freed to the still oxygen covered parts of the surface. As stable final state a stationary pattern results under reaction conditions formed by K +…
An optical in-situ study of the re-oxidation kinetics of mixed valent Yb3Al5O12
The optical spectra of blue Yb-garnet single crystals have been studied in the range of 200 to 1200 nm. The spectra exhibit absorption bands due to Yb2+ and Yb3+ ions including 4f–4f transitions on Yb3+ as well as 4f–5d transitions on Yb2+ ions, and a band due to Yb2+–Yb3+ intervalence charge-transfer (IVCT) responsib…
Self-assembled semiconductor capped metal composite nanoparticles embedded in BaTiO3 thin films for nonlinear optical applicationsElectronic supplementary information (ESI) available: results obtained for Au@CdS composite nanoparticles prepared by the same route. See http://www.rsc.org/suppdata/jm/b3/b306590a/
A simple synthetic route with a direct self-assembling process was developed to synthesize sulfide semiconductor capped metal composite nanoparticles. Gold nanoparticles have been encapsulated with PbS nanocrystals to form spherical composite nanoparticles with core–shell structure. Stable Au@PbS composite colloids we…
An X-ray Rietveld, infrared, and Mössbauer spectral study of the NaMn(Fe 1− x In x ) 2 (PO 4 ) 3 alluaudite-type solid solution
Several compounds of the NaMn(Fe 1-x In x ) 2 (PO 4 ) 3 solid solution were synthesized by solid state reaction in air; pure alluaudite-like compounds were obtained for x = 0.00 to 1.00. X-ray Rietveld refinements indicate the presence of Na + at the A1 and A2’ sites, Mn 2+ at the M1 site, and Fe 2+ , Fe 3+ , and In 3…
Primary charge separation in photoinduced multielectron storage systems. A dinuclear ruthenium( ii ) species featuring a charge-separated state with a lifetime of 1.3 µs
The primary photoinduced charge separation and recombination processes occurring in a dinuclear Ru(II) complex capable to perform multielectron storage upon light excitation have been studied in different solvents: the charge-separated state obtained in dichloromethane is, to the best of our knowledge, the longest-liv…
Catalytic control of electron-transfer processes
Abstract Catalytic control of electron-transfer processes is described for a number of photoinduced and thermal electron-transfer reactions, including back electron transfer in the charge-separated state of artificial photosynthetic compounds. The intermolecular and intramolecular electron-transfer processes are accel…
Corrosion of Electrogalvanized Steel in 0.1 M NaCl Studied by SVET
The corrosion of electrogalvanized steel exposed to 0.1M NaCl was studied using the SVET. Situations of localized corrosion, cathodic protection and corrosion protection due to surface pre-treatment were analyzed, putting in evidence the possibilities of the technique.
Aerosol-assisted metallo-organic chemical vapour deposition of Bi2Se3 films using single-molecule precursors. The crystal structure of bismuth(iii) dibutyldiselenocarbamate
The complexes [Bi{Se2CN(C2H5)2}3], [Bi{Se2CN(C4H9)2}3], [Bi{Se2CN(CH3)(C4H9)}3] and [Bi{Se2CN(CH3)(C6H13)}3] have been synthesized and characterized structurally using IR, 1H and 13C NMR. In addition, the crystal structure of [Bi{Se2CN(C4H9)2}3] was determined by single-crystal X-ray diffraction, showing the bismuth c…
Structure–Property Relationships in Natural Cellulosic Fibres: Part III: Flax—an Oil Sorbent
This is the third part in our current series of research papers featuring structure-property relationships in natural cellulosic fibres focussing on flax fibre. The capacity of fibres to remove different types of oil from sea water and oil baths has been related to the chemical composition and surface properties of th…
Formation of lanthanide phosphates in molten salts and evaluation for nuclear waste treatment
The formation of phosphates of the lighter lanthanides (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy) by reaction with alkali metal phosphates has been studied in a LiCl–KCl eutectic melt between 450 and 650 °C and in a NaCl–KCl equimolar melt at 750 °C and under an inert atmosphere. Alkali metal ortho-, meta- and pyrop…
Room-Temperature Discotic Nematic Liquid Crystals
The use of discotic nematic liquid crystals instead of calamitic nematic liquid crystals to improve the viewing angle of a liquid crystal display device has recently been reported. Compared to the large number of calamitic molecules showing nematic phase at room temperature, the number of disk-shaped molecules showing…
A New Method for Describing the Atomic-scale Structure of Rusts Formed on the Iron Based Alloy Surlaces.
Quantitative structural analysis by conventional X-ray diffraction and anomalous X-ray scattering coupled with the reverse Monte-Carlo simulation technique has been carried out, in order to characterize the atomicscale structure of rust formed on the surface of Fe, Fe-2 %Cr, Fe-3 %Ni and Fe-1.6 %Cu alloys and a weathe…