Materials Literature
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Sulfonated polyrotaxanes (PRx-SO(3)'s), in which sulfonated alpha-cyclodextrins (alpha-CDs) were threaded onto the poly(ethylene glycol) (PEG) segments in a PEG-b-poly(propylene glycol) (PPG)-b-PEG triblock copolymer (Pluronic) capped with benzyloxycarbonyl (Z)-L-phenylalanine (Z-L-Phe), were prepared as a novel surfa…
Magnetically induced phase separation along the Curie temperature in the hexagonal-close-packed phase of a Co–Mo binary system has been predicted by thermodynamic calculations. Furthermore, the phase separation and magnetic properties of Co–Mo sputtered thin films have been investigated. Nanoscale compositional fluctu…
Pulsed magnetic field (0–4.4 T) was used to study the magnetic field dependent resistivity (12–350 K) and thermoelectric power (0–1.5 T) of Na and K-doped La0.7Ca0.7−yAyMnO3 (0.0⩽y⩽0.3, A=Na, K) system showing semiconducting to metallic transitions around temperature Tp. Na/K-doping increases both conductivity and Tp.…
The PZT-based ceramics with a composition of Pb1 − 0.5x (Zr0.52Ti0.48)1 − x Nb x O3; x = 0.04–0.06 were prepared by conventional mixed-oxide method, with sintering temperature at 1200°–1300° for 2 hours. Microstructural and compositional analyses of the PZT-based ceramics have been carried out using XRD and SEM. The d…
Alumina oxide was deposited in the straight nanosize pores of Anopore alumina membrane by the alternative introduction of trimethylaluminum (TMA) and water vapor to the membrane pores. The chemical vapor deposition (CVD) modification was conducted under two different schemes: (1) cyclic CVD with residual pressure and…
Abstract In the present work broadband dielectric relaxation spectroscopy measurements were employed to investigate the dielectric properties of polymer composites. A polyethylene/polyoxymethylene (PE/POM) thermoplastic blend was used as a matrix, while the inclusions were iron (Fe) particles. For comparison, the two…
Abstract Recent studies have demonstrated that highly multilayered blend morphologies can be formed by chaotic mixing and captured within extrusions of various forms. The number and thickness of internal layers prior to layer breakup and the extent of breakup are controllable via specification of process variables. A…
A new apparatus is developed to measure the Water vapor permeability resistance of textiles with and without temperature differences imposed on both sides of a specimen. Water vapor resistance is measured for a combination of temperature and pressure that simulates elevated altitudes. The effect of temperature on wate…
Abstract Nanostructural analysis of pillared clay samples using high-resolution transmission electron microscopy has been developed. Montmorillonite samples were pillared using partially hydrolyzed Al and Fe solutions. Two samples, M01 and M05, corresponding to Fe/(Fe+Al) ratios of 0.1 and 0.5, respectively, were anal…
Abstract The influence of cation size on the misfit between the tetrahedral and the octahedral sheets of serpentine layers, and thus on the curvature of serpentine minerals, has been studied using an experimental approach, based on scanning and high-resolution transmission electron microscopies (SEM and HRTEM, respect…
Abstract The original description of nickelphosphide from the Butler meteorite [(Ni 1.83 Fe 1.21 ) Σ3.04 P 0.96 to (Ni 1.71 Fe 1.28 Co 0.01 ) Σ3.00 P 1.00 ] lacks detailed and accurate powder data – with only 11 observed reflections down to 1.37 Å. Consequently, no crystal structure information for this phase is avail…
Abstract A simple kinetic model describing the molecular gas phase reactions during the formation of fumed silica (AEROSIL®) was developed. The focus was on the formation of molecular SiO 2 , starting from SiCl 4 , hydrogen and oxygen. Wherever available, kinetic and thermodynamic parameters were taken from the litera…
A simple, one-step LPCVD process was recently reported to allow the repeatable fabrication of polycrystalline silicon (polysilicon) thin films containing through-pores measuring 10-50 nm in diameter, as-deposited, with no additional processing steps required. This paper describes methods for using this one-step porous…
The article describes the perhaps most important synthetic access, the so-called macromonomer route to dendronized polymers which are comb polymers with dendrons of varying generations as the teeth. After a brief description of this route in general terms, some recent examples are discussed. The polymerisation mechani…
Abstract A new hyperbranched poly(phenylene oxide) was synthesized from a simple AB 2 type monomer, 3,5‐dibromophenol, by Ullmann polycondensation. The bromo‐terminated hyperbranched poly(phenylene oxide) was amorphous ( T g = 120 °C), but showed high thermal stability ( T 5d = 480 °C in nitrogen). The polymer with th…
Abstract This paper describes the 70/30 wt% composition of SAN/PA6 blends having different types of morphology, namely PA6 dispersed in SAN, a co‐continuous structures of PA6 and SAN, and a “mixed structure” which exhibits PA6 particles in SAN which themselves form the matrix for smaller SAN particles. These morpholog…
Cytochrome c can be readily adsorbed onto mesoporous silicates at high loadings of up to 10 mmol g(-)(1) of silicate. The adsorbed protein retains its peroxidative activity, with no diffusional limitations being observed. The protein can be adsorbed onto the external surface of the silicate or, provided that the pore…
Nous avons affine la structure cristalline de l'argentojarosite naturelle, dont la formule ideale est AgFe 3 (SO 4 ) 2 (OH) 6 , a 7.3398(7), c 16.538(3) A, V 771.4(2) A 3 , groupe spatial R3m, Z= 3, jusqu'a un residu R 1 de 2.8% sur une base de 307 reflexions uniques mesurees avec rayonnement MoKa et un diffractometre…
This work reports studies on the electrochemical behavior of AB5-type hydrogen storage alloys, formed by LaNi(5-x)Zx, where Z is a metallic element partially replacing Ni, which included Sn, Al, Mn, and Pd. In the case of Mn, some AB6-type structures were also considered. Substitution of a small fraction of Ni by Al,…
Abstract In the present paper the potential use of hyperbranched (HB) aramids as metallic solution stabilisers and carriers for homogeneous catalysis is outlined. Aramids, synthesised either from A 2 + B 3 reagents [namely, p ‐phenylenediamine (PPD) and trimesic acid (TMA)] or from an AB 2 monomer [i.e., 5‐(4‐aminoben…