Materials Literature
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During the studies on fouling diatoms in Zuary estuary the overlying surface diatoms were also studied for comparison. In all 66 spp. of planktonic diatoms have been recorded, belonging to 29 genera. Out of these, 36 species (16 genera) were Pennales and 30 (13 genera) Centrales. The common diatoms observed were Chaet…
The rates of formation of the DCTA complexes of Ce3+, Eu3+ and Yb3+ are significantly lower than expected on the basis of the water-exchange rates of Ln3+(aq). The kinetics of formation of these complexes were studied by means of a stopped-flow method. The reactions were found to be first order in the reactants, and t…
Flax fibers coated with two types and various amounts of silicones are used to make flax-polyurethane composites. Coating conditions have been found to affect strongly the composites properties. The effect of these two types and different amounts of silicone on the impact toughness, flexural strength and modulus, dyna…
In this work we study the effect of the nixtamalization time on the structural, morphological and thermal properties of the corn pericarp. We also studied the semi-quantitative changes in the chemical composition of the pericarp by x-ray diffraction. By correlating the results obtained by x-ray diffraction and photoac…
The pathway of dehydration and intramolecular cyclization of lisinopril dihydrate in the solid state was investigated using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and a combination of thermal analyzer with Fourier transform infrared microspectroscopy (thermal FT-IR microscopic system…
The choice of polymeric materials in electronic packaging influences not only the performance parameters of electronic devices, but also their long-term reliability. Adverse conditions such as humidity, high temperature, and vibration prevent the electronic devices from functioning in the way that they were designed.…
The change of network morphology of unfilled sulfur crosslinked natural rubber exposed to thermal oxidative ageing has been studied. Three model networks with different sulfur contents (efficient network, semi-efficient and conventional vulcanizate) have been analysed by applying spin probe ESR, equilibrium swelling m…
The heat transfer coefficients during natural convection of water on a downward-facing horizontal surface and that on a vertical surface were measured under the influence of ultrasonic vibrations. The multi-type oscillation used in this experiment was able to operate at three frequencies—28, 45, and 100 kHz—not only c…
A new photochromic cross-linked copolymer composed of PMMA and fluorescing 2-indolylfulgimide is synthesized which can be converted photochemically into two forms which are found to be thermally stable; the spectroscopic properties and quantum yields of photochemistry and fluorescence are also measured.
The cryptand derivative has H-bond mediated trigonal network structure that leads to octupolar bulk nonlinearity
Tetraethylorthosilicate (TEOS), hexamethyldisilazane (HMDS) and n-hexane, plasma deposited on alumina pellets, result in hydrophobic and chemically resistant films, while TEOS treated alumina powder showed significant changes in the zeta potential as a function of pH.
Several strains of thermophilic bacteria containing maleate cis-trans isomerase were isolated from soil samples and identified as Bacillus stearothermophilus, Bacillus circulans, Bacillus brevis, and Deleya halophila. The maleate cis-trans isomerase was purified and characterized from one of the isolated strains, B. s…
The effects of lamination temperature on the properties of poly(ethylene terephthalate-coisophthalate) (co-PET), such as thermal, mechanical, and barrier properties, have been investigated in co-PET laminated steel. The variation of the degree of crystallinity and the orientation of the co-PET film during the laminati…
Degradable polymers including Eastar Bio Copolyester 14766 (EBC), Mater-Bi ZF03U (MBI) andpolylactic acid (PLA) blended in various ratios (10, 25, and 40%) with regular (25% amylose) and waxy corn starcheswere extruded into loose-fill packaging foams using a co-rotating twin screw extruder. No significant differences…
Surface-enhanced Raman scattering from 2,2′-bipyridine adsorbed on nickel is detected without roughening procedure of the surfaces. The SERS-activation is assured by depositing silver colloidal layer onto the metal with adhering ligand. The SERS spectrum closely corresponds to the Raman spectrum of the Ni(II) coordina…
To characterize easily the state of real metal surfaces in ambient environments, we have developed an extremely sensitive technique for surface analysis using photoelectron emission phenomena as a function of temperature. We will call this method temperature-programmed photoelectron emission (TPPE). The emitted electr…
This work has investigated the electrical and material characteristics of post‐chemical mechanical planarization (CMP) methylsilsesquioxane (MSQ). Experimental results have shown that the dielectric properties of low k MSQ deteriorate after the CMP process. However, by applying post‐treatment, the degraded characteris…
The 1-naphthylmethylammonium salts of not only (Z,Z)- but also (E,E)-muconic acid were found to polymerize upon photoirradiation in the crystalline state to provide a stereoregular polymer in a high yield. The stereochemical structure of both polymers obtained from the monomers with different configurations was identi…
Extracted from text ... A comparison of leather properties of skins from ten different South African sheepbreedsM.A. Snyman 1 and C.A. Jackson-Moss 21 Grootfontein ADI, P/Bag X529, Middelburg, (EC), 59002 International School of Tanning Technology, P.O. Box 2085, Grahamstown, 6140e-mail:Dier6@karoo1.agric.zaIntroducti…
Various protonated poly(o-anisidine) (PoAN)/poly(vinyl alcohol) (PVA) composites were prepared with different types of acids: sulfuric (SA), p-toluene sulfonic (TSA), camphor sulfonic (CSA), and p-dodecylbenzene sulfonic (DBSA). In the visible spectrum of each composite in dimethyl sulfoxide, three absorption peaks we…