Materials Literature
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Atomically-resolved surface photovoltage (SPV) imaging with a scanning tunnelling microscope was used by several laboratories to reveal the local degree of sub-surface electronic band bending at and around defects and adsorbates on various semiconductor surfaces. It turns out that the scanning tunnelling microscope ti…
Abstract Mixed layering of illite-smectite was studied both experimentally, by using high-resolution transmission electron microscopy (HRTEM) and analytical electron microscopy (AEM), and theoretically, by using lattice-energy calculations. Samples from a hydrothermal origin show the transformation of smectite to illi…
The splitting between longitudinal and transverse optical modes was observed in the infrared reflection spectra of silica glasses at different incident angles. The density of states and the frequency of the longitudinal mode were found to increase with increasing incident angle. A sharp minimum in the reflectance was…
A mushy region is assumed to consist of a fine mixture of two distinct phases separated by free boundaries. For simplicity, the fine structure is here taken to be periodic, first in one dimension, and then a lattice of squares in two dimensions. A method of multiple scales is employed, with a classical free-boundary p…
Time-resolved resonance Raman spectroscopic measurements were undertaken to probe the axial ligand and solvent effects on the photophysical and photochemical processes of some paramagnetic metalloporphyrins (CuII, CrIII, MnIII and FeIII porphyrins). The presence of odd electrons in d-orbitals of the central metal ions…
Surface wetting behaviors of cotton and two rayons, one a regular crenulated and the other a trilobal (Galaxy), all stripped of topically applied finish, are determined using a sensitive Wilhelmy technique. The contact angles (advancing and receding), work of adhesion, and surface energies are assessed. For the latter…
Type 316 stainless steel weld metal with 0·07%N, prepared using nitrogen bearing 316 stainless steel filler wire by the manual metal arc (MMA) welding process, was evaluated for the microstructural changes and pitting corrosion resistance in as welded and aged (at both 1023 and 1123 K for 0·5, 1, 10, and 100 h) condit…
Poly(arylether benzoxazole)s (PAEBOs) were prepared from a series of fully aromatic dicarboxylic acids containing (phenylenedioxy)diphenylene or (naphthalenedioxy) diphenylene groups and 3,3′-dihydroxy-4,4′-diaminobiphenyl (I) or 4-4′-(hexafluoroisopropylidene)bis(2-aminophenol) (II) through high-temperature direct po…
Abstract Smectites of sedimentary series from a playa lake system from Calatayud Basin have been studied by XRD and TEM chemical microanalyses. Clay particle microanalyses show complete continuity between dioctahedral aluminous and trioctahedral magnesian smectites. Aluminous smectites have been classified as montmori…
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…