Materials Literature
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Abstract HIPS/UHMWPE and HIPS/XL‐UHMWPE containing carbon black (CB) are unique systems in which CB is attracted to the PE, and thus structuring takes place affecting the morphology and the resultant electrical properties. UHMWPE, having a very high viscosity, was chosen as the dispersed phase within HIPS in place of…
The electrochemical behaviour of 254SMO stainless steel in HCl solutions has been studied and compared with that observed for other alloys using open circuit potential measurements, potentiodynamic polarisation curves, and SEM analysis techniques. 254SMO does not display pitting corrosion at room temperature in HCl so…
A variety of nanosized (particle dia. <100 nm) ceramic powders have been prepared from metal ion complex based precursor solutions. The precursor solution was prepared at room temperature from metal hydroxides, nitrates, or acetates mixed with suitable complexing agents such as amines, carboxylic acids, hydroxy carbox…
To develop novel dispersants for submicrometer‐sized Si 3 N 4 powder, the surface chemistry of a powder has been investigated using thermodesorption, carrier‐gas heat extraction, X‐ray photoelectron spectroscopy, diffuse reflectance infrared Fourier transform spectroscopy, and zeta potential measurements. This study i…
The 2075°C melting temperature of boron has hindered the growth of hexagonal boron nitride (h-BN) crystal. The use of Si flux was reported to decrease the growth temperature to 1850°C. In this work, we discovered Na as a new flux for the growth of h-BN crystals at a temperature as low as 700°C. The growth of h-BN dete…
NiO-Al2O3 catalyst prepared by calcining a Ni-Al hydrotalcite precursor efficiently reduces nitroarenes and carbonyl compounds in presence of propan-2-ol and KOH. Presence of two different reducible groups in the substrate leads to chemoselective reduction.
2‐undecane‐5‐mercapto‐1‐oxa‐3, 4‐diazole (UMOD), 2‐heptadecene‐5‐mercapto‐1‐oxa‐3, 4‐diazole (HMOD) and 2‐decene‐5‐mercapto‐1‐oxa‐3, 4‐diazole (DMOD) were synthesized in the laboratory and their influence on the inhibition of corrosion of mild steel in 1N HCI and 1N H 2 SO 4 was investigated by weight‐loss and potenti…
Abstract A technology has been developed to produce biaxially oriented films of blends of polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) using double bubble tubular film extrusion. The mechanical instabilities and the mechanisms associated with their sources of occurrence are described. Bubble s…
Interesting morphologies were observed when Comamonas acidovorans containing polyhydroxyalkanoates (PHA) of various compositions was freeze-fractured at temperatures far below the glass transition temperatures of PHA. In vivo granules of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) comparatively showed the most ductil…
Three kinds of diffuse scattering associated with phonon and static disorder in ${\mathrm{SrTiO}}_{3}$ were studied by electron diffraction with a parallel beam. (1) Streaks of diffuse scattering along the reciprocal lines MRM were found to originate from dynamically correlated rotations of oxygen-octahedra within the…
The composite sol—gel (CSG) technology has been utilized to process SiC—Al 2 O 3 ceramic/ceramic particulate reinforced composites with a high content of SiC (up to 50 vol%). Alumina sol, resulting from hydrolysis of aluminum isopropoxide, has been utilized as a dispersant and sintering additive. Microstructures of th…
Abstract The MudMaster computer program, based on the modified Bertaut-Warren- Averbach (BWA) XRD method, was used in the study of diagenetic evolution of illitic material in shales. The illitic material was characterized by XRD as a mixture of illite-smectite (I-S) and discrete illite. The experimental conditions for…
This paper reports results that show the effect of microwave absorption on the bulk crystallization of two glasses in the CaO—ZrO 2 —SiO 2 system. The glass samples were devitrified using either microwave or conventional heating, to compare the results obtained from the two different techniques. Remarkably different c…
Hydrous tin oxide powders were precipitated at room temperature via the neutralization of sodium stannate with gluconic acid. The gluconic acid was generated by the oxidation of glucose, with the assistance of a glucose oxidase/catalase system. The hydrous tin oxide, which had a large surface area, was obtained when a…
We examine the effect of surfactants on the evolution of the shape of an initially nonspherical drop translating in an otherwise quiescent fluid at low Reynolds number. A combination of the boundary-integral method and a finite-difference scheme is used to solve the coupled fluid dynamics and surfactant transport prob…
We have combined attenuated total reflectance/Fourier transform infrared (ART/FT-IR) and Raman microscopy to examine the diffusion rates and redistribution profiles of three different silane adhesion coupling agents into plasticized and unplasticized PVC. Below the glass transition temperature ( T g ) of the polymer,…
Abstract Phenolic/silica ceramers were prepared by the sol‐gel method. Carbon fiber reinforced phenolic/silica ceramer composites with high thermal resistance were fabricated. Tetraethyl orthosilicate (TEOS) was used as a monomer for sol‐gel system. Different ratios of the sol‐gel solutoins and phenolic resins were ad…
The microstructure of ZrO 2 fine particles produced by a novel synthesis method at 450° and 950°C has been studied. The fundamentals of the synthesis method, which involves both chemical and diffusion phenomena, are presented. The method is based on mass transport through the gaseous phase between metallic zirconium a…
Mass spectrometric studies of the composition of the gaseous phase under solid compounds of free phthalocyanine ( H 2 Pc ) and its complexes with aluminium ( AlClPc , AlFPc , ( AlPc ) 2 O ) and copper ( CuPc ) were performed in the temperature range up to 700 °C. It has been shown that the phthalocyanines sublime in t…
A charge-coupled device (CCD)-based detector designed for macromolecular crystallography is described. The detector has an area of 200 × 200 mm, a readout time of 1.6 s, and total noise equivalent to approximately three 12 keV X-ray photons per pixel. The detector is constructed from a 2 × 2 array of four identical un…