Materials Literature
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In this study it is shown that the stacking sequences in long-period mica polytypes (including a rare example of a mixed-rotation polytype, with a 36-layer long periodicity) can be unambiguously determined using atomic resolution images recorded down two zone axes separated by 30 degrees (e.g. [100] and [31;0]) at the…
Ferroelectric liquid crystalline elastomers (FLCEs) form a novel class of materials, in which the properties of macroscopically oriented ferroelectric liquid crystals can be combined with those of elastomers. The (direct and the inverse) piezoelectric effect in these systems is measured and analyzed on a molecular lev…
The synthesis and characterization by single-crystal X-ray crystallography of a series of monomeric first-row transition-metal complexes with the 1-methoxycyclobutenedionate(1-) ligand are described. The isomorphous compounds [M(CH(3)OC(4)O(3))(2)(H(2)O)(4)] (M = Mn, Co, Ni, Zn) are C(2) symmetric and crystallize in t…
We report the effect of Fe doping on magnetic properties and magnetoresistance (MR) in the layered perovskite La1.2Sr1.8Mn2O7. Fe doping results in the weakening of ferromagnetic (FM) ordering, and the occurrence of a low-temperature spin-glass state in La1.2Sr1.8Mn2−xFexO7. Resistivity increases sharply with increasi…
The crystal structure of albite from Stintino, Sardinia, Italy, was refined at different degrees of disorder to determine the (Si-Al) order-disorder process. Eight X-ray structure refinements were performed on single-crystal data collected at room temperature, after heating at 1050-1090 °C for 3 to 12 days. Average lo…
Decomposition of N2O on Cu-ZSM-5 was studied by temperature-programmed reaction (TPR), in situ Fourier transform infrared spectroscopy (FTIR) and XPS. It is found that the decomposed intermediates of N2O— dinitrogen and oxygen ion— show adsorption bands at 2161 cm−1 and 910 cm−1 in the IR spectrum, which can be assign…
Amorphous carbon containing very little hydrogen and having a highly tetrahedral structure has been prepared by the Filtered Cathodic Vacuum Arc (FCVA) technique under different deposition temperatures. Based on Raman measurement, it was found that the ID/IG intensity ratio, the G band peak position and the linewidth…
The p(1×1) adsorption of atomic oxygen on the fcc and hcp three-fold hollow site of a Pt(111) surface has been investigated by a periodic slab model, varying the number of layers from two to four. The density functional method with local spin density approximation and with generalized gradient exchange−correlation fun…
The diffusion and transport of organic solvents through crosslinked nitrile rubber/poly(ethylene-co-vinyl acetate) (NBR/EVA) blends have been studied. The diffusion of cyclohexanone through these blends was studied with special reference to blend composition, crosslinking systems, fillers, filler loading, and temperat…
A water‐based route for processing ß‐Si 3 N 4 from alpha‐Si 3 N 4 , Al 2 O 3 , and Y 2 O 3 powder mixtures was established. The surface charges and isoelectric points of the three different powders were investigated within the pH range from pH 3 to pH 12. Citric acid diammonium salt was found to be an effective defloc…
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The solids gain and water loss during osmotic dehydration of coated apples were found to be dependend on concentration of pectin solution (0.5–4%) and drying time of coated apples (0–40 min). The coated apples were found to have generally a smaller the solids gain and higher or the same water loss than uncoated sample…
Blends of poly(3-hydroxybutyrate)-poly(3-hydroxyvalerate) (PHB-HV) and polyalcohols have been prepared by solvent casting. The polyalcohols used were castor oil (CO) and polypropylene glycol (PPG400 and PPG1000). Thermal behaviour, crystallinity, morphology and dynamic mechanical properties of systems with various PPG…
Abstract Temperature dependence of radiation effect on various polymers including hydrocarbon and fluorocarbon polymers was investigated. Gas evolution and mechanical properties were measured in a wide range of temperatures. G‐values of chain scission and crosslinking were estimated. It has been made clear from those…
Covalent bonds between the heavy metal cations and the aluminosilicate framework have been discovered to be the cause of distinct structural characteristics in anhydrous sodalites Ag 6 [AlSiO 4 ] 6 and Tl 6 [AlSiO 4 ] 6 that differ significantly from their alkali metal containing analogues. Evidence of guest−framework…
The drawing behavior of the ultra-high molecular weight polyethylene (UHMW-PE) melts has been studied by comparing the stress/strain curves for two types of samples as polymerized using conventional Ziegler and newer metallocene catalyst systems. Two UHMW-PE samples, having the same viscosity average molecular weight…
Measurements of time-resolved photoluminescence reveal an F centre luminescence lifetime of 35 ms in Al2O3:C at room temperature, decreasing to less than 2 ms over the temperature range from 370 to 500 K. The decrease in the lifetime follows a classical Mott-Seitz dependence for thermal quenching of luminescence, with…
The effect of colloidal Au particle aggregation on surface-enhanced Raman scattering (SERS) spectra was probed by SERS filtration experiments. In this approach, SERS and optical spectra were recorded for trans-1,2-bis(4-pyridyl)ethylene (BPE)-aggregated solutions of colloidal Au filtered through straight-channel membr…
Poly(styrene- b -isobutylene- b -styrene) (PSt−PIB−PSt) triblock copolymers have been prepared for the first time via coupling of living PSt-PIB diblock copolymers in a one-pot procedure. The PSt−PIB diblock copolymer was synthesized by living sequential cationic polymerization in methylcyclohexane (MeChx)/methyl chlo…
Some metal containing block copolymers derived from polystyrene-block-poly(4-vinylpyridine) were synthesized. The complexation was achieved by reacting the poly(4-vinylpyridine) block with 2,2′-bipyridyl(tricarbonyl)rhenium(I) chloride in the presence of silver perchlorate. The resulting polymer metal complexes are ab…