Materials Literature
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The zero-field intergrain tunneling conductivity $\ensuremath{\sigma}$ of sintered and granular ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ increases linearly with temperature over the range $\ensuremath{\sim}20--300\mathrm{K},$ at least. The residual conductivity of the investigated samples ranges over more than four ord…
Abstract The thermal behavior of poly(ethylene imine) (PEI) hydrates in a water vapor atmosphere was investigated through temperature‐dependent measurements of infrared spectra and X‐ray diffraction. Almost perfectly dried anhydrate melted at about 60 °C during the heating process. Anhydrate containing a small amount…
We report on a construction for smectic blue phases, which have quasi-long-range smectic translational order as well as three-dimensional crystalline order. Our proposed structures fill space by adding layers on top of a minimal surface, introducing either curvature or edge defects as necessary. We find that for the r…
Hexagonal MCM-41 can be transformed into cubic MCM-48 and finally into spherical particles by the addition of alcohol during the synthesis of a mesoporous silica material. X-ray diffraction suggests that the structure of these spherical particles is of the MCM-41 type. Transmission electron microscopy however reveals…
The influence of the morphology and separation of Ag nanoparticles (NPs) on the position of the surface plasmon resonance has been studied. The NPs have been produced on amorphous a-Al 2 O 3 surfaces by means of alternate pulsed laser deposition in a layered structure. The films finally produced consist of five layers…
The inhibition of corrosion of aluminium in chloroacetic acids, namely monochloroacetic acid (MCA), dichloroacetic acid (DCA) and trichloroacetic acid (TCA) solutions, using 2‐acetylphenothiazine (2APTZ) at 30 and 40°C, at concentrations of 1×10 −3 M, 1×10 −4 M, 7.5×10 −5 M, 5×10 −5 M and 1×10 −5 M, was studied using…
The optical properties of a silica layer containing Si nanocrystals deposited onto fused quartz are studied with emphasis on optical waveguiding (WG) of the photoluminescence (PL). The WG layer was estimated to be 4.3 μm thick with a refractive index of 1.67. We observed efficient (long-distance) propagation of the PL…
Our first-principles study of the contact between a semiconducting single-walled carbon nanotube (s-SWNT) and metal electrodes shows that the electronic structure and potential depend strongly on the type of metal. The s-SWNT is weakly side-bonded to the gold surface with minute charge rearrangement and remains semico…
Abstract Novel polyimides with side chains containing various methylene spacers and biphenyl end groups were prepared. They were characterized by the inherent viscosity, mechanical properties, and solubility and by Fourier transform infrared, 1 H‐nuclear magnetic resonance, X‐ray diffraction, differential scanning cal…
Abstract The reaction of highly condensed heptadecavanadate with labile metal compound gave the first reduced tridecavanadate with hydrogen bonds to make a novel dimeric structure: the protonated and reduced sites were unambiguously determined by X-ray analysis. The reduced tridecavanadate was not directly converted c…
The inhibition of sweet gas corrosion of carbon steel in high pressure CO 2 saturated brine by rosin amine has been studied by weight‐loss, electrochemical polarisation and electrochemical impedance spectrum measurements. The results obtained revealed that rosin amine compound is a good inhibitor. The inhibition effic…
Abstract Poly(vinyl chloride) PVC pyrolysis and hydrolysis are conducted in a fixed bed reactor and in an autoclave, respectively, under different operating conditions such as the temperature and time. The product distribution is studied. For the PVC pyrolysis process, the main gas product is HCl (55% at 340°C), there…
Abstract Polyolefins, particularly polyethylene, are known to fail via crack initiation and crack propagation when exposed to multiaxial long‐term static stresses at elevated temperatures. Using concepts of linear elastic fracture mechanics, this article describes and discusses the effects of stabilization on the kine…
Abstract The synergistic activity of binary accelerator systems in rubber vulcanization is well known. Binary accelerator systems are being widely used in industry and are becoming increasingly popular because of the fact that such mixed systems can effectively prevent prevulcanization, permit the vulcanization to be…
Abstract The effect of moisture on the mechanical relaxation processes of semiaromatic semicrystalline polyamides synthesized by a long‐chain aliphatic diamine and terephthalic acid was investigated by dynamic viscoelastic analysis (DVA) and differential scanning calorimetry (DSC). Moreover, the implication of moistur…
Abstract Cellulose flame retarded with an ammonia‐cured, polycondensed tetrakis(hydroxymethyl)phosphonium–urea derivative (as Proban CC®, Rhodia) phosphorylated by cyclic 1,3‐propanediol phosphoryl chloride and cyclic 2,2‐diethyl‐1,3‐propanediol phosphoryl chloride can give phosphorus levels up to 6.9% (w/w). Such hig…
Abstract Poly(trimethylene terephthalate) (PTT)/montmorillonite (MMT) nanocomposites were prepared by the solution intercalation method. Two different kinds of clay were organomodified with an intercalation agent of cetyltrimetylammonium chloride (CMC). X‐ray diffraction (XRD) indicated that the layers of MMT were int…
The inhibiting effects of 2,6‐ionen and 2,10‐ionen type polyvinylbenzyltrimethylammonium chloride, and latex, on low carbon steel in hydrochloric acid solution was investigated by potentiodynamic polarisation measurements and impedance measurement techniques over the temperature range of 20‐60°C at different inhibitor…
We discuss the formation of a Si/Ge-superlattice (SL) generated by molecular beam epitaxy. Specific growth parameter were chosen to optimize the periodic structure of vertically stacked Ge islands. Optimized SLs show a strong photoluminescence at a wavelength in the region of 1.55 μm up to room temperature. The lumine…
Abstract Hydrolytic depolymerization of PET (polyethylene terephthalate) waste in excess of water was studied using a 0.5‐L stirred high‐pressure autoclave at temperatures of 100, 150, 200, and 250°C and at 200, 300, 400, 500, 700, and 800 psi (pounds per square inch) pressure. Velocity constants of hydrolysis were ca…