Materials Literature
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In the last decade the sol‐gel process became a promising method to synthesize materials in form of coatings, nanoscale powders and porous systems. Several products or devices made with such a process already exist on the market. This paper briefly reviews the state of the art in the development of electrochromic coat…
The steady-state and impedance response of a solid metal point electrode in contact with a solid, oxygen-ion conducting electrolyte in atmospheres was derived for three reaction mechanisms, involving gaseous species or species adsorbed on the surface of the electrode and/or the electrolyte. The overall electrochemical…
A new potassium titanate, KTiO 2 (OH), synthesized by hydrothermal oxidation of Ti metal powder in KOH solution was characterized. The X-ray photospectroscopy revealed that titanium contained in this compound consists of only Ti 4+, and FT-IR spectrum supported the existence of hydroxyl group in the structure. It was…
The radical ClCNSSN (1) exhibits a rigid geometry which limits structural variation in the solid state to differences in packing motifs. Sublimation of 1 (75 °C, 10−2 Torr) leads to the isolation of three distinct polymorphs; 1α (monoclinic, P21/n) crystallises as cisoid dimers with two molecules in the asymmetric uni…
A two‐step sintering process is described in which the first step suppresses densification while allowing the α‐to‐β phase transformation to proceed, and the second step, at higher temperatures, promotes densification and grain growth. This process allows one to obtain a bimodal microstructure in Si 3 N 4 without usin…
Intramolecular energy transfer from platinum–acetylide moieties to the porphyrin core was observed in novel organometallic dendrimers that were prepared from a tetra(4-ethynylphenyl)porphyrin-bridged tetranuclear platinum–acetylide core and platinum–acetylide dendrons by a convergent method.
Reaction of 3-(propyltrimethoxysilyl)acetylacetone with Ti(OiPr)4 results in new single-source precursors for dispersed silica–titania mixed-metal oxides with low titania crystallization tendencies.
Gelatin microspheres and gelatin sponges were prepared by coacervation and freeze drying techniques, respectively. Both systems were crosslinked with glutaraldehyde. The mean diameter of the microspheres were in the range of 40-80 microm and the mean pore size of the sponges was 130-220 microm depending on the prepara…
The strategy of producing crystals of uni-modal size distribution was investigated for dilution (or anti-solvent) crystallization. Sodium chloride was crystallized as a model compound from aqueous solution by adding pure ethanol (99 vol.% ethanol) or an ethanol-water (75 vol.% ethanol) mixture as diluent. The effects…
The relaxor ferroelectric, Sodium Bismuth Titanate, (Na 0.5 Bi 0.5 TiO 3 ), NBT is an A-site substituted distorted perovskite. An extensive temperature-, pressure- and substitution-dependent study of the crystal structure and phase transitions in this compound has been carried out using neutron/x-ray diffraction techn…
High‐strength porous alumina has been fabricated with a microstructure control using the pulse electric current sintering (PECS) technique. During sintering the discharge, which is assumed to take place in the voids between the particles, is thought to promote the bridging of particles by neck growth in the initial st…
Potential-dependent Fourier transform infrared emission spectroscopy (pd-FTIRES) has been used for the first time to study, in situ , oxygen reduction under practical operating conditions of intermediate-temperature solid oxide fuel cells. Surface emission difference spectra of functioning cathodes at 550°C under a va…
Using a supramolecular approach a class of compounds containing the [(H2O)5Fe–O–Fe(H2O)5]4+ core, viz. [(H2O)5Fe–O–Fe(OH2)5](NO3)4·(18-crown-6)2, (1), [(H2O)5Fe–O–Fe(OH2)5](ClO4)4·(18-crown-6)2·2H2O (2) and [(H2O)5Fe–O–Fe(OH2)5](NO3)10[Fe(OH2)6]2(15-crown-5)4·(H2O)6, (3), has been prepared and characterized. These thr…
Batch cooling crystallization of potassium alum in aqueous solution was conducted over a wide range of seed loading with various average seed sizes under the natural cooling condition. A solution of a low saturation temperature was used. In this dilute solution the supersaturation during crystallization did not become…
Research Article| January 01, 2002 Sedimentary Phosphorites—An Example: Phosphoria Formation, Southeastern Idaho, U.S.A. Andrew C. Knudsen; Andrew C. Knudsen Department of Geological Sciences, University of Idaho, Moscow, Idaho 83844 Search for other works by this author on: GSW Google Scholar Mickey E. Gunter Mickey…
We used microcontact printing to pattern a silicon surface with\n an iron-containing catalytic solution. Multiwall carbon\n nanotubes were subsequently grown on the patterned areas by\n chemical vapor deposition at temperatures between 650 and 1000\n degreesC. We demonstrate that the diameter of the catalytically\n gr…
In this paper, we review our recent results on hydrogen storage, structural and optical properties in multi-layered Pd/Mg thin films. The thin films were prepared using a RF associated magnetron sputtering method, in which the structure in Mg layer was controlled into columnar-like textures with several tens nanometer…
Ultrafine ruthenium-vanadate particles possessing a rutile-type structure, were prepared by a polymerizable-complex method and their electrochemical supercapacitor behavior was studied by cyclic voltammetry in an acidic solution. The solid solution exhibited enhanced supercapacitive properties compared to pure The pre…
Abstract In nanocatalysis, clusters deposited on solid, well-defined surfaces play an important role. For the detection of size effects it is, however, important to prepare samples consisting of deposited clusters of a single size, as their chemical properties change with the exact number of atoms in the cluster. In t…
The performance of electrochemical devices, namely, the potentiostat, has increased considerably lately, and some commercial devices determine impedance on the order of teraohms ( 10 12 Ω ) . At the same time, the protective effectiveness of paint films has also improved markedly, and the paint films exhibit capacitan…