Materials Literature
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Six methods for the numerical calculation of zero-order Hankel transforms of oscillating functions were evaluated. One method based on Filon quadrature philosophy, two published projection-slice methods, and a third projection-slice method based on a new approach to computation of the Abel transform were implemented;…
A new method was devised for the synthesis of 1,9-diacyldipyrromethanes - crucial intermediates in the synthesis of meso-substituted corroles and porphyrins with different substituents. The diacylodipyrromethanes formation involves acylation of dipyrromethanes with salts made in situ from POCl 3 and tertiary amides. T…
The length and width shrinkages, skewness, spirality and moisture content of three weft knitted cotton structures, plain single jersey, interlock and lacoste, were determined at regular intervals during tumble drying. Significant length and width shrinkages occurred in all three structures with the amount of shrinkage…
A problem encountered in patients undergoing long-term catheterization of the urinary tract is that of encrustation and blockage of the catheter by crystalline bacterial biofilms. This is principally caused by the action of the urease-producing pathogen Proteus mirabilis. A major aim of this work is to develop materia…
Abstract New polyimide foams and polyimide foam filled honeycombs are currently being developed at NASA, its licensee Sordal Inc. (USA) and Newmet (UK) under the trade name Solrex®. These materials are foreseen for Space, Aerospace, Maritime & Medicine applications. In this paper selected properties of these new m…
A new law for high-speed friction is presented in this paper. This law is based on observations made by several investigators regarding the asymptotic behaviour of sliding friction as the speed is increased. The new frictional effect is incorporated into the equations for rigid-body penetration to develop an analytica…
The pulsed electroacoustic (PEA) method is used to measure space charge distributions in insulating materials. A high-resolution PEA measurement system and signal procedure has been discussed in previous papers. Since the signal procedure is necessary for high-resolution measurement, the system must include a computer…
Nominally clean diamond surfaces have been shown to contain adsorbed foreign atoms on them. Some of the adsorbed atoms have also been known to lead to various surface modifications, a phenomenon that is important in diamond electronics. Establishing the identity and nature of the adsorbed atoms on these surfaces is th…
In the past, it has been suggested that a solute-rich layer at the oxide/metal interface was responsible for the significantly enhanced passivity of nonequilibrium Al-Mo and Al-W alloys in comparison to pure aluminum. X-ray photoelectron spectroscopy, Auger electron spectroscopy, and transmission electron microscopy w…
Abstract Mixed phthalocyaninato tetrakis(4‐pyridyl)porphyrinato rare earth triple‐decker complexes M 2 (TPyP) 2 (Pc) [M = La ( 1 ), Eu ( 2 )] have been prepared by condensation between M(TPyP)acac generated in situ and M(Pc) 2 . Their symmetrical structure (TPyP)M(Pc)M(TPyP) was verified by 1 H NMR (1D and 2D) spectra…
An atomic dipole interaction model has been used for calculating the second hyperpolarizability of carbon nanotubes on a length scale up to 75 nm. It is demonstrated that an atomistic representation of mesoscale systems such as nanotubes can be used to obtain a cubic response property up to a size of the system where…
TiN‐coated Si 3 N 4 particles were prepared by depositing TiO 2 on the Si 3 N 4 surfaces from Ti(O‐ i ‐C 3 H 7 ) 4 solution, the TiO 2 being formed by controlled hydrolysis, then subsequently nitrided with NH 3 gas. A homogeneous TiO 2 coating was achieved by heating a Si 3 N 4 suspension containing 1.0 vol% H 2 O wit…
Abstract MCM-48 is functionalized with mono-, di-, and triamino-silanes without destruction of the mesoporous structure in order to efficiently remove chromate and arsenate in aqueous solutions. The adsorption capacities achieved 160 and 182 mg/g-adsorbent for chromate and arsenate, respectively, when triamino-functio…
Abstract Reduced-charge samples were prepared from Li + - and Ni 2+ -saturated SAz-1 montmorillonite by heating at 150 and 300°C for 24 h. X-ray diffraction analysis showed interstratification of non-swelling and swelling interlayers in LiS150, while fully expandable interlayers were found in NiS150. Heating at 300°C…
Over the past 30 years the combination of chemical separation and molecular analysis has proven invaluable to the analytical chemist in identifying chemicals at extremely low concentrations in complex matrices. For example, a drug and its metabolites can be effectively separated from blood plasma using gas chromatogra…
Abstract The paper deals with interactions between low molecular weight substances and silica. Activity of SiO 2 towards ethylene‐propylene‐diene rubber (EPDM) also depends on the kind of crosslinking system used. Calcium carbonate, the filler exhibiting low interactions with elastomers does not show any changes in ac…
Automatic weld hardfacing is being employed increasingly in process and power industries. Plasma transferred arc welding (PTAW) has become a natural choice for automatic hardfacing due to its reliability, better process control, ease of use, low dilution and high volume production. Increasing the use of PTAW in its au…
Abstract In the chitons (Polyplacophora, Mollusca), the body is not entirely protected by the shell. Mineralized spicules or scales often, but not always, decorate the exposed part of the girdle. Here, we report a study on the composition and ultrastructural organization of these mineralized skeletal parts in four dif…
A complete classification for unbundling transitions of two semiflexible polymers and for desorption transitions of such polymers at planar surfaces is presented. The interaction potentials can depend both on the polymer/polymer (or polymer/surface) separation and on the orientation of the polymers. Using analytical t…
Surface-enhanced Raman spectroscopy (SERS) has proven to be a very powerful tool in the analysis of a wide range of compounds. However, continuous irradiation of the laser beam over the SERS substrate can promote the gross decomposition of the sample analytes and significantly broaden and diminish the intensities of o…