Materials Literature
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Extended data sets for the relative intensity variation of x-ray Bragg reflections of GaAs and ZnSe caused by an external electric field were collected using a modulation demodulation technique. In particular, the functional dependence of the intensity variation on field strength and wavelength of the synchrotron radi…
Abstract Interfacial polycondensation of 2,2′‐bis[2‐(5‐chloroformylfuryl)]propane with various diamines gave high yields of a novel series of furanic polyamides with high inherent viscosities. The properties of these polymers ( T g , surface energy, crystallinity, thermal stability) were assessed and examined in terms…
Crystals of 1,4-bis(2-hydroxy-2-methyl-3-butynyl)-2-fluorobenzene 4 have a rich packing structure with four distinct molecules in the unit cell. A complex hydrogen bonding network results in the formation of cofacial trimers, cofacial dimers, and monomers within the same unit cell. Given a remarkable opportunity to in…
Surface electronic states of the partially hydrogenated diamond $\mathrm{C}(100)\ensuremath{-}(2\ifmmode\times\else\texttimes\fi{}1):\mathrm{H}$ surface were studied by near-edge x-ray absorption fine structure and C $1s$ core level photoemission. Partially hydrogenated surfaces were prepared by synchrotron irradiatio…
Abstract Rheological behaviour and cure characteristics of silica‐filled styrene–butadiene rubber (SBR) compounds and SBR compounds filled with both silica and carbon black with different silica contents were investigated. Rheocurves of the time versus the torque of the compounds showed specific trends with the silica…
Abstract New phosphorus‐containing aromatic diesteramines, 1,4‐bis(4‐aminobenzoyloxy)‐2‐(6‐oxido‐6H‐dibenz〈 c,e 〉〈1,2〉oxaphosphorin‐6‐yl)naphthalene ( p ‐ 3 ) and 1,4‐bis(3‐aminobenzoyloxy)‐2‐(6‐oxido‐6H‐dibenz〈 c,e 〉〈1,2〉oxaphosphorin‐6‐yl)naphthalene ( m ‐ 3 ), were synthesized by the reaction of 2‐(6‐oxido‐6H‐diben…
Highly crystalline and porous vanadium-incorporated MCM-48 materials were prepared using gemini surfactants as structure-directing agents and vanadyl sulfate pentahydrate as the source of the heteroelements. Materials with Si/V ratios varying from 20 to 100 were synthesized without loss of the typical cubic MCM-48 str…
Interfacial energetics, local ionic coordinations, and electronic states at basal twin interfaces in $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ (corundum) were investigated by means of first-principles density-functional and empirical shell-model calculations. Three different metastable twin…
Abstract Hydroxypropylcellulose (HPC) has been used as a steric stabilizer for preparing polyaniline dispersions using the route of oxidative dispersion polymerization of aniline. Using strongly acidic conditions (1 mol l −1 HCl), low temperature of about 2 °C and a concentration of aniline as low as 0.5%, ammonium pe…
Abstract White rice husk ash (WRHA)–polypropylene (PP)/natural rubber (NR) composites were prepared using a Brabender Plasticorder at 180 °C and a rotor speed of 50 rev min −1 . The mechanical and water‐absorption properties were studied. The incorporation of WRHA into the PP/NR matrix has resulted in the improvement…
A wide class of magnetic molecular materials - molecular clusters with high magnetic moment containing 3d transition metals (such as `Fe 8 ', `Mn 12 ac', etc) - have been considered from the point of view of their use as refrigerants in low-temperature regions. The consideration was made in the framework of the model…
Electrical treeing is of interest to the electrical generation, transmission and distribution industries as it is one of the causes of insulation failure in electrical machines, switchgear and transformer bushings. Previous experimental investigations of electrical treeing in epoxy resins have found evidence that the…
Abstract The crystallization kinetics of polypropylene (PP) with or without sodium benzoate as a nucleating agent were investigated by means of DSC and polarized optical microscopy in isothermal and nonisothermal modes. A modified Avrami equation was applied to the kinetic analysis of isothermal crystallization. The a…
A comprehensive characterization of the compound ${\mathrm{Fe}}_{2}\mathrm{VAl}$ was carried out. Samples grown by arc melting or the Bridgman method have Al and Fe deficiencies of up to 5 at. %. Czochralski-grown samples were Fe rich and Al deficient. X-ray diffraction implies appreciable antisite disorder in all of…
Density functional theory calculations were performed on an activation of hydrogen peroxide over a cluster model of a titanosilicate catalyst. The calculation results showed possibility to form the hydrated peroxo-titanosilicalite complex, containing a (Ti)-O-O-(Si) peroxo-moiety, as an oxidizing agent. Using this hyd…
We report solvatochromatic shifts in the absorption spectra of colloidal CdSe quantum dots that are consistent with the change in polarization energy of the quantum-confined exciton. Good agreement with theory is found when the screening from the ligand shell is included. The polarization energy also accounts for the…
We present a detailed magnetic study of the perovskite manganite ${\mathrm{Pr}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ at low temperatures including magnetization and ac susceptibility measurements. The data appear to exclude a conventional spin glass phase at low fields, suggesting instead the presence of correl…
We consider a porous medium being saturated with a pore fluid (Biot's theory). The fluid is assumed as incompressible. It is shown that the general integral of the elastic and pressure equations can be written in form of a time dependent vectorpotential ${\bf F}$ being a solution of a homogeneous, fourth order differe…
One of the expectations in science is the discovery of materials with surprising properties or functionality based on designed molecules that self-order or fold. The focus on self-assembly throughout the 90s has generated very useful knowledge toward this expectation and many prospects are on the horizon.1-6 Learning…
Ab initio molecular orbital theory was used to examine the physisorption of a hydrogen molecule on planar and curved graphene clusters. The repulsive nature of a H 2 −H 2 interaction and the small dependence of physisorption energies on physisorption sites favor a close-packed structure for molecular hydrogen physisor…