Materials Literature
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For the diagonalization of the Hamilton matrix in the Heisenberg model relevant dimensions are determined depending on the applicable symmetries. Results are presented, both, by general formulae in closed form and by the respective numbers for a variety of special systems. In the case of cyclic symmetry, diagonalizati…
By means of ab initio molecular dynamics and band structure calculations, as well as using calculated STM images, we have singled out one structural model for the (3x2) reconstruction of the Si-terminated (001) surface of cubic SiC, amongst several proposed in the literature. This is an alternate dimer-row model, with…
The influence of colloid diameter on the surface plasmon resonance (SPR) response of a colloidal Au modified Au film is described. Adsorption of 30−59 nm diameter colloidal Au on the surface of a 47 nm thick Au film results in dramatic, size-dependent shifts in plasmon angle, minimum reflectance, and curve breadth. Ea…
The diameters of primary mesopores in materials with well-defined cylindrical pores can be accurately determined by the 4 V / A method when the volume and surface area are determined by a standard adsorption method and 13.5 Å 2 is used as the molecular area of adsorbed nitrogen. A simple method for determining standar…
Copolymers of acrylic acid and styrene with styrene unit contents of 2.7, 5.7, and 9.5% were synthesized by free radical copolymerization. Poly(ethylenimine)s with benzylated unit contents of 2.4, 6.0, 10.6, and 16.7% were obtained by the reaction of poly(ethylenimine) with benzyl bromide. Polyelectrolyte complex caps…
Composites based on maleated polypropylene and methyl cellulosic fiber were prepared by extrusion followed by injection molding. The methyl cellulosic fiber was pretreated with tetrabutyl orthotitanate prior to compounding. The mechanical and thermal properties, as well as morphology of composites, were investigated b…
Morphological and structural formation of the regenerated cellulose membranes from its cuprammonium hydroxide solution by acid coagulation was investigated. Scanning electron microscopic observation revealed that the morphology of the membranes changed drastically as functions of both the cellulose concentration in th…
Polyesteramide (PEA) and alumina-filled polyesteramide (APEA) resins were synthesized from N,N′-bis(2 hydroxyethyl) linseed amide. The FTIR, 1H-NMR, DSC, TGA, thermal curing, and physico-chemical characterization of these polymers were carried out. The coatings of PEA and APEA were made on mild steel strips. The mecha…
A new theoretical equation that describes the thermal conductivity of two-phase composite materials has been proposed. The Cheng-Vachon equation has been modified by introducing a new parameter named Pd max, permitting the new equation to describe the thermal conductivity of composite materials for a wide variety of f…
Gelation of strongly basic silico−alkaline solutions was promoted by appropriate additions of calcium ions. The structure of the aggregates formed in the precursor sols and the resulting gels were studied, within a wide length scale, using small-angle X-ray, small-angle neutron, and elastic light scattering. The study…
Halophilic malate dehydrogenase unfolds at low salt, and increasing the salt concentration stabilizes, first, the folded form and then, in some cases, destabilizes it. From inactivation and fluorescence measurements performed on the protein after its incubation in the presence of various salts in a large range of conc…
Four commercial aluminas and different cobalt loadings have been selected to better understand the interactions between Co oxides and metallic cobalt with alumina surfaces. The solids have been characterized, after drying and calcination procedures or after reduction under H 2, using thermogravimetric analysis (TGA),…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotorelease of Carboxylic Acids from 1-Acyl-7-nitroindolines in Aqueous Solution: Rapid and Efficient Photorelease of l-Glutamate1George Papageorgiou, David C. Ogden, Andreas Barth, and John E. T. CorrieView Author Information National Institute for Medical Research,…
Two anionic soluble monomers, mono(2-methacryloyl oxyethyl)acid phosphate and vinylsulfonic acid sodium salt, were grafted onto chitosan to obtain copolymers with zwitterionic property. Graft reaction improved the antimicrobial activities of chitosan. Antimicrobial activities of chitosan and graft copolymers depended…
A highly deacetylated chitosan from shrimp with a degree of deacetylation of 95 ± 3% was prepared and spun into a monofilament fiber using a solution of 5% by weight chitosan in 5% by volume aqueous acetic acid. Samples of the spun fibers were immersed in separate solutions containing phosphate ions and phthalate ions…
For the development of calix[4]arene-based radiotherapeutic agents, the conjugation to biomolecules and immunogenicity in mice of potential 225Ac3+-chelating calix[4]arenes were studied. A calix[4]arene triethyl ester isothiocyanate and a bis(calix[4]arene) hexacarboxylic acid, containing a masked thiol functionality,…
The copolymers derived from zwitterionic DMAPAMAIPS and hydrophobic monomer (AdMAI or NaMAI) were studied in terms of the surface tension, viscometrics, and photophysical measurements. The surface tension of poly(DMAPAMAIPS) was shown to be larger than that of both the copolymer [poly(DMAPAMAIPS/NaMAI)] with an aromat…
Three analogous phyllosilicates were synthesized via a sol−gel process from the reaction of magnesium ions with aminated trialkoxysilanes in an aqueous basic medium at 373 K. The inorganic−organic hybrids obtained, designated as SILMg x ( x = 1−3) are related to [3-aminopropyl]-, [ N -(2-aminoethyl)-3-aminopropyl]-, a…
Thin polymer films were formed on models of tissue surfaces using polyelectrolyte multilayer techniques, to evaluate the feasibility of using such techniques to build barrier materials onto the surfaces of tissues to improve postsurgical healing, or on the surfaces of tissue-engineered implants. By incubating heteroge…
The chemical carryover of impurities and treatment chemicals from the boiler to the steam phase, and ultimately to the low-pressure turbine and condenser, can be quantified based on laboratory experiments preformed over ranges of temperature, pH, and composition. The two major assumptions are that thermodynamic equili…