Materials Literature
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Abstract This paper concerns the morphology development of in situ compatibilized semicrystalline polymer blends in a co‐rotating, intermeshing twin‐screw extruder, using polypropylene (PP) and polyamide 6 (PA‐6) blends as model systems. The morphology of in situ compatibilized blends develops much faster that of mech…
The surface properties of ammonia core and ethylenediamine core poly(amidoamine) starburst dendrimers (N−SBD and EDA−SBD, respectively) were comparatively investigated, by employing photochemical and spectroscopic probes. Photoinduced electron-transfer quenching of tris(2,2‘-bipyridyl)ruthenium(II) chloride by methyl…
Despite recognition that Fe availability is significant in regulating oceanic production in some regions, the biogeochemistry of this trace element is poorly understood. To complement contemporary methods of analytical chemistry, we have used an immunological approach to monitor the Fe nutrition of marine phytoplankto…
Novel multicomponent organogels containing an aqueous phase are described, and some properties which influence their potential as delivery devices for hydrophilic drugs and vaccines are discussed. The gel is produced by preparing a hot water-in-oil (w/o) emulsion using sorbitan monostearate, a nonionic surfactant whic…
The dynamic failure evolution of textile composites, which were subjected to impact velocities up to 1100 m/s, was investigated. Specialized machines were used to fabricate composites from combinations of Spectra®, Kevlara®, and Twaron® fibers and two- and three-dimensionally woven, braided, and needle-punched nonwove…
The use of a direct crystallographic technique is reported for locating Cr atomic sites in a mullite containing 11.5 wt% Cr 2 O 3 by monitoring variations in characteristic X-ray emission rates as a function of fast electron beam orientation. Systematic examination of two dimensional incoherent channeling patterns (…
Dynamical and static properties of N=13-4000 hard spheres in spherical cavities with smooth and rough walls have been calculated by molecular-dynamics computer simulations. We use a dynamical criterion to distinguish between fluidlike and solidlike states. The associated crossover densities show a strong dependence bo…
We propose a simple physical model of phase separation of colloidal suspensions and emulsions, which we call the "viscoelastic model." On the basis of this model, we consider two poorly understood phenomena: (i) phase separation accompanying the formation of a transient gel, and its collapse, and (ii) shear effects on…
Abstract The thermal effects, as well as the survivability and origins of microorganisms in Cretaceous rocks, are evaluated from the timing and extent of the smectite to illite transformation in Cretaceous bentonites collected from cores outside the thermal aureole of the Pliocene Cerro Negro volcanic neck. Overall, r…
The processes of the energy deactivation of electronic excitation in Yb(III) -diketonates and their dependence on the nature of -diketone and the second ligand as well as the environment and its state (complexes in organic solvents and polymer matrix) were studied. Taking as an example the ytterbium thenoyltrifluoroac…
An experimental study was conducted to investigate the performance of several polymer outdoor insulator formulations under AC and DC electrical stresses. The performance of the polymers was evaluated in terms of their charge accumulation and decay characteristics as a function of humidity, and their tracking and erosi…
Abstract Because layered Fe(II)Fe(III)-hydroxides (Green rusts, GRs) are anion exchangers, they represent potential orthophosphate sorbents in anoxic soils and sediments. To evaluate this possibility, two types of experiments with synthetic sulphate-interlayered GRs (GR SO4 = Fe 2+ 4 Fe 3+ 2 (OH) 12 SO 4 ×H 2 O) were…
The affects of lipase concentration on ring-opening bulk polymerizations of epsilon-caprolactone and trimethylene carbonate were studied by using Novozym 435 (immobilized form of lipase B from Candida antarctica) as biocatalyst. The polymerization of epsilon-caprolactone was carried out in bulk at 70 degrees C. Three…
Abstract The reactive compatibilization of polypropylene/polyethylene terephthalate (PP/PET) blends by addition of glycidyl methacrylate grafted PP (PP‐g‐GMA) was studied. Two PP‐g‐GMA copolymers, containing either 0.2 or 1.2 wt% of GMA, were used as interface modifiers. These were incorporated into PP blends (with ei…
We present here a detailed structural comparison, both in the solid state and in aqueous solution, of a complete series of lanthanide cryptate complexes of a Schiff base axial macrobicyclic ligand L of general formula [LnL][NO 3 ] 3 · x H 2 O (Ln = La−Lu, Y); the macrobicyclic receptor L is an azacryptand N[(CH 2 ) 2…
The new phthalocyanine-like macrocycle tetrakis(selenodiazole)porphyrazine, TSeDPzH 2 , and its Mg ( II ) and Cu ( II ) complexes have been prepared and their general, spectroscopic (IR, UV-vis), and magnetic properties investigated. It has been observed that the peripheral selenodiazole rings of the TSeDPz skeleton c…
The structure and powder diffraction data of Hägg-carbide (χ- Fe 5 C 2 ) have been redetermined and improved by X-ray diffraction. Experimental values of 2θ, corrected for systematic errors, relative peak intensities, lattice spacings, and the Miller indices of 27 observed reflections up to 100° 2θ are reported. The u…
1. We have used fluorescence confocal laser scanning microscopy to attain the three-dimensional (3-D) microstructure of perimysial collagen fibres over the range of sarcomere lengths (1.9-2.3 micrometers) in which passive force of cardiac muscle increases steeply. 2. A uniaxial muscle preparation (right ventricular tr…
The luminescence properties at room temperature and 77 K of octamethylcorrole are reported for the first time, together with the photophysical behaviour of corrole-corrole and porphyrin-corrole dyads covalently linked through the 10-position with a phenyl bridge. The photophysical properties of corrole free base are v…
We present a comprehensive theory of the magnetization relaxation in a Mn 12 -acetate crystal based on thermally assisted spin tunneling induced by quartic anisotropy and weak transverse magnetic fields. The overall relaxation rate as a function of the magnetic field is calculated and shown to agree well with data inc…