Materials Literature
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Tip-enhanced Raman spectroscopy (TERS) is based on the optical excitation of localized surface plasmons in the tip-substrate cavity, which provides a large but local field enhancement near the tip apex. We report on TERS with smooth single crystalline surfaces as substrates. The adsorbates were CN- ions at Au(111) and…
Hexagonal sodium yttrium fluoride, NaYF 4, is the most efficient host material to date for green (Yb 3+ /Er 3+ doped) and blue (Yb 3+ /Tm 3+ doped) upconversion (UC) phosphors, i.e., phosphors which emit visible light upon infrared (IR) excitation. The structure of the hexagonal phase gives rise to controversy about t…
Abstract The synthesis and crystal structure of Li 3 AlB 2 O 6 with different cell parameters are reported and these cells are transformed each other from the confirmation of crystallographic structural analyses. The absorption spectrum, luminescence and lifetimes of the Li 3 AlB 2 O 6 and LiSrBO 3 solid compounds are…
A review discusses the roles of novel alkoxy titanates and zirconates as additives for polymers. As coupling agents, they chemically bond inorganic as well as organic fillers and polymers via proton coordination without the need of water of condensation as for alkoxysilanes. Thermally stable alkoxy titanates and zirco…
Kinetics of the processes of low density polyethylene (PE-LD) crosslinking in the presence of three commercial organic peroxides: dicumyl (Di-Cup R), t-butylcumyl (Interox BCUP) or 2,5-dimethyl-2,5-di-(t-butylperoxy)-hexyne (Interox DYBP) ones were compared using rheometric method. Ranges of the peroxides themselves d…
Metal hypophosphites are widely used in various fields. However, their structures have not been adequately studied. The synthesis conditions (the temperature and precursors) were found and crystals of anhydrous Li, K, Rb, Cs, and NH 4 hypophosphites were grown. The structures of these compounds were established by X-r…
Abstract Crystallization of binary blends of semi-crystalline polyolefins (i-polypropylene and HD-polyethylenes) and amorphous cycloolefin copolymers (COC) was followed by Differential Scanning Calorimetry (DSC). Blend morphologies were investigated by Scanning Electronic Microscopy (SEM). The thermal behavior and mor…
Abstract Thin films (50–1200 nm) of YFeO3 were deposited on fused silica substrates by spray-pyrolysis using ethylene glycol solution of Y-Fe(III) citric complexes. The films were post deposition annealed at 750°C in static air for 2 h. Films obtained in this way were afterwards irradiated by a burst mode operated Nd-…
The effect of SBS and nano-CaCO3 on the mechanical properties of PS blends was studied, and their morphologies were characterised by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The Izod impact strengths of notched samples of PS/SBS/CaCO3 blends with nanometre particles of nano-CaCO3…
Two one-dimensional chain complexes, {[Cu(cda) 2 H 2 O]·H 2 O} n (1) and {[Cu(cda)(H 2 O) 2 ]·(ClO 4 )·3H 2 O} n (2) (cda = carbamyldicyanomethanide anion) have been synthesized and their crystal structures determined by X-ray crystallography. The copper(II) ions in 1 are bridged by two µ 1,5 -cda bridging ligands, wh…
Corrosion events such as uniform corrosion, localized corrosion and hydrogen evolution at metal–liquid interfaces can be monitored by a combination of electrochemical noise and corrosion inhibition measurements. The effective prediction of corrosion inhibition by surfactants can be accomplished by determining the surf…
Study of structural properties of (Ba0.5Sr0.5)PbO3 has been carried out in a wide temperature range from 10 to 1223 K using the X-ray powder diffraction technique. Two temperature-induced structural phase transitions at 948 and 1198 K have been found. For polycrystallines the XPS and electrical resistivity measurement…
Random copolymers containing both ferrocene groups and thioether groups were synthesized by free-radical copolymerization of vinylferrocene and 2-(methylthio)ethyl methacrylate, and the random nature of the copolymerization was confirmed by spectroscopic studies. Copolymers with ferrocene-to-thioether ratios of 8 : 1…
Ring frame process parameters, namely spindle speed, top roller pressure and traveller mass, have been optimized using three-variable Box and Behnken design to achieve better yarn quality and production. It is observed that 15000 rpm spindle speed with top roller pressure of 2.5 kg/cm2 and traveller mass of 50 ISO No.…
Curved-face growth of NaNO 3 crystals under the action of the (NH 4 ) 2 Mo 2 O 7 impurity is studied experimentally and possible causes of face bending are analyzed. Selective impurity adsorption on the basal pinacoid results in growth of platelike crystals with spherically bent faces. Growth-rate measurements show th…
The goal of the work presented here was to synthesize multiblock copolymers based on transesterification polycondensation of end group functionalized PEEK with PSU oligomers in the melt. In the synthesis of PEEK oligomers by nucleophilic aromatic substitution cyclization occured observed by decreasing amount of end gr…
A novel vibrational spectroscopic approach has been developed to better understand the structure activity relationship (SAR) component of the drug discovery effort. First, vibrational spectroscopy has been developed as a tool for the identification of molecular subcomponents within a compound series, which play an act…
A polysilane with a C-to-Si ratio of 6.0 was pyrolysed to produce an amorphous matrix (source powder), which was heated further to obtain different products. These polysilane-derived samples were studied using X-ray diffraction, Raman spectroscopy, solid-state magic-angle-spinning nuclear magnetic resonance and transm…
The reaction of antimony(III) oxide with ethylamine, in molar ratios from 1:1 to 1:10, in concentrated hydrobromic acid leads to the formation of one product - bis(ethylammonium) pentabromoantimonate( III). The structure of (C 2 H 5 NH 3 ) 2 [SbBr 5 ] was determined at 298 and 90 K, below and above the phase transitio…
The spin-reorientation transition of layered perovskite oxide SrNdFeO 4 has been investigated through powder x-ray and neutron diffraction, magnetic susceptibility, specific heat and 57 Fe Mössbauer spectrum measurements. This oxide presents tetragonal symmetry (space group: I 4/ mmm ) and the FeO 6 octahedron is axia…