Materials Literature
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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…
The linear tetrapyrrole ligand, H2TPKB, undergoes chemical modification through hydroxide addition to produce a binuclear copper(II) complex with an interesting structure that involves coordination of the three pyrrole nitrogen atoms to one copper(II) center, a bridging alkoxide, and the terminal keto group which is b…
Oxidative polymerization of 2,6-disubstituted phenols has been performed by using iron(III)-salen complex and hydrogen peroxide as catalyst and oxidizing agent, respectively. The oxidative reaction of 2,6-dimethylphenol produced the polymer along with a byproduct dimer of 3,5,3',5'-tetramethyl-4,4'-dipheno-quinone. Th…
The Fe57 nuclear magnetic resonance (NMR) shielding and chemical shift in ferrocene, Fe(C5H5)2, are studied using density functional theory (DFT) and gauge-including atomic orbitals (GIAO). Electronic factors contributing to the chemical shift are discussed in detail. It is shown that the chemical shift is entirely de…
We report a detailed crystal-field splitting analysis of the energy levels of Dy3+(4f9) in single crystals of Dy2S3 that have the Th3P4 cubic defect structure. From an analysis of the temperature-dependent absorption spectra, we have identified seven of the eight crystal-field split energy (Stark) levels of the ground…
We have studied by X-ray reflectometry the variation of electron density of thin polymer films near solid substrates. For most polymers studied, which interact only mildly with the selected substrate (SiO 2 ), a decrease of density was detected over a region spanning two to three statistical segment lengths at the sol…
The structures and coalescence behavior of size-selected, matrix-isolated silicon clusters have been studied using surface-plasmon-polariton (SPP) enhanced Raman spectroscopy. The cluster ions were produced in a laser vaporization source, mass selected then deposited into a co-condensed matrix of Ar, Kr or N2 on a liq…
Ultrathin poly(vinyl alcohol) (PVA) films were fabricated on a gold substrate by a repetitive process based on physical adsorption from aqueous solution in the presence of NaCl and subsequent drying. A quartz crystal microbalance (QCM) was used to analyze the assembled amount quantitatively. The assembled amount incre…