Materials Literature
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A short survey of technological aspects of electrochromism with various electroactive species is given. Different approaches with inorganic and organic materials have been pursued in the past. So far widespread usage of this technology for large area applications has not been achieved. Nevertheless one major technical…
A special sample was prepared by controlled oxidation of MoO2, which contained MoO2, Mo4O11 and MoO3, in order to extend the knowledge about the resonance Raman effect in reduced molybdenum oxides from those close to MoO3 to those close to MoO2. This knowledge is of paramount importance because technical partial oxida…
The electronic and spin states of a series of Co-Fe Prussian blue analogues containing Na(+) ion in the lattice, Na(x)()Co(y)()Fe(CN)(6) x zH(2)O, strongly depended on the atomic composition ratio of Co to Fe (Co/Fe) and temperature. Compounds of Co/Fe = 1.5 and 1.15 consisted mostly of the Fe(III)(t(2g)(5)e(g)(0), LS…
Ultrasensitive Raman measurements in single living cells are possible through exploiting the effect of surface-enhanced Raman scattering (SERS). Colloidal gold particles (60 nm in size) that are deposited inside cells as “SERS-active nanostructures” result in strongly enhanced Raman signals of the native chemical cons…
Tissue engineering has emerged as a promising alternative approach in the treatment of malfunctioning or lost organs. In this approach, a temporary scaffold is needed to serve as an adhesive substrate for the implanted cells and a physical support to guide the formation of the new organs. In addition to facilitating c…
The effect of the replacement of antimony atoms by bismuth atoms on the electrical properties of compounds of the melt-quenched and thermally evaporated Ge 25 Sb 15- x Bi x S 60 ( x = 0, 5, 10 and 15) chalcogenide system are reported for the first time. The results for the alternating-current (ac) conductivity σ ac an…
In situ, time resolved energy dispersive EXAFS (EDE) has been used in conjunction with temperature programmed reduction/decomposition (TPR/TPD), transmission electron microscopy (TEM), powder X-ray diffraction (PXRD), and diffuse reflectance infrared spectroscopy (DRIFTS) to probe the evolution and character of Pt and…
The mild cleavage of phosphonodiester groups supported on a silica matrix has been investigated. The use of TMSBr (bromotrimethylsilane) with diethyl phosphonates has been revisited, and interactions of phosphonoacids with silicon species are described. An alternative route utilising di-tert-butyl phosphonate group ha…
The growth of CdS 0.08 Se 0.92 nanoparticles in glass is studied through the analysis of optical absorption spectra with the help of a quantized-state effective-mass model in which the conduction band effective mass is particle size dependent. The glass includes nanoparticles with an initial average size of ~1.4 nm on…
Stable translucent aqueous suspensions of ligand-functionalized nanoparticles, with average diameters ranging from 12 to 20 nm and containing from 0.25 to up to 0.75 mmol of ligand/g, are readily obtained by copolymerization in oil-in-water microemulsions of a polymerizable tetraaza macrocycle, vinylbenzylcyclam (cycl…
A new series of regioregular poly(terthiophenes), bearing bis(thioether) side groups, has been prepared by electrochemical oxidation. Cyclic voltammetry of the parent trimers reveals an increase in electron donating ability in cyclic thioether derivatives. For example, one compound containing a central ethylenedithiot…
Using a simple mean-field density functional approach we investigate the adsorption of a binary fluid mixture of repulsive Gaussian core particles at a repulsive planar wall. For certain choices of wall-fluid potential we find a first-order wetting transition, and the accompanying pre-wetting line, whereby the fluid p…
Fluoropolymer films were deposited on pristine and N2 plasma-pretreated copper foil surfaces by plasma polymerization of allylpentafluorobenzene (APFB) under different glow discharge conditions and using argon as the carrier gas. The effect of the radio-frequency (RF) plasma power on the surface composition and chemic…
An organic soluble polyimide was prepared from 3,3′-dihydroxybenzidine and 2,2-bis(phthalic anhydride)hexafluoropropane. The two hydroxy groups in the repeating unit of the polyimide thus prepared were utilized in attaching 4-nitro-4′-diphenylaminoazobenzene chromophores onto the main chain perpendicularly (or in an e…
Abstract A series of amphoteric polyacrylamides with different molecular weights and charges were prepared by the copolymerization of acrylamide with sodium acrylate and a subsequent Mannich reaction. The copolymerization was carried out with a redox initiation system via inverse emulsion polymerization. Reaction cond…
Abstract A spherical TiCl 4 /MgCl 2 ‐based catalyst was used in the synthesis of in situ isotactic polypropylene/ethylene–propylene random copolymer blends by propylene bulk polymerization and subsequent gas‐phase copolymerization of ethylene with propylene. Different copolymerization conditions, such as the reaction…
We study the effects of pressure on the existence of floppy modes in silica glass. We find that small values of pressure do not alter the ability of silica glass to sustain floppy modes, as long as they are not accompanied by changes in the topology of the glass, and thus do not change the balance between the number o…
Introduction of a single meso substituent into ClFe(III)(OEP) or K[(NC)(2)Fe(OEP)] results in significant changes in the geometric and/or spectroscopic properties of these complexes. The mono-meso-substituted iron(III) complexes ClFe(III)(meso-Ph-OEP), ClFe(III)(meso-n-Bu-OEP), ClFe(III)(meso-MeO-OEP), ClFe(III)(meso-…
The air-synthesized La 1- x Ba x MnO 3 system was revisited for 0.4⩽ x ⩽0.9. We show that this system exhibits an insulator-metal like transition, T IM (175-230 K), far below the Curie temperature ( T C ≈335 K). In contrast to previous studies, we demonstrate that this system is multiphase, i.e. involving a hexagonal…
Ion-beam-induced microstructures in magnesium aluminate (MgAl 2 O 4 ) spinel have been examined using transmission electron microscopy (TEM). Irradiations were performed at cryogenic temperature (~120 K) on MgAl 2 O 4 spinel single-crystal surfaces with (111) orientation, using 180 keV neon (Ne + ) ions to ion fluence…