Materials Literature
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Spontaneous electron transfer, along with anion uptake by doping, form the basis of a new concept for the reduction of toxic Cr(VI) using an electronically conductive polymer, e.g. , polypyrrole. Proof of concept experiments are described which show that aqueous sulfuric acid solutions containing 5–100 ppm Cr(VI) can…
Abstract Free‐radical reactions, which are relevant in the chemical modification of polymeric materials, are discussed in relationship to their influence on random chain scission. A mathematical model is developed to calculate the entire molecular weight distribution (MWD) with the degree of chain scission as the sole…
Using potentiodynamic and transient electrochemical methods and weight loss shows that N-alkylbetaines are good inhibitors of iron corrosion in HCl at concentrations around the critical micelle concentration (CMC). High corrosion inhibition is observed when medium pH value is lower than organic compound pKa. When the…
La 2 Ti 2 O 7 , M r =485.613, monoclinic, P2 1 , a=7.812 (2), b=5.5440 (7), c=13.010 (2) A, β=98.66 (1) o , V=557.0 (4) A 3 , Z=4, T=298 K, D x =5.790 Mg m -3 , λ(Mo Kα)=0.71073 A, μ=17.86 mm -1 , F(000)=856. The crystals are twinned. The twin I and twin II intensities are superimposed in reciprocal-lattice layers wit…
The purpose of this study was to compare the heterogeneity and median charge of FSH and LH in serum at different phases of the normal human menstrual cycle. Serum specimens were obtained during the follicular phase [9.0 +/- 1.9 (+/- SD) days before the midcycle], at the midcycle LH peak, and during the luteal phase (9…
Formation of a protective surface layer [a layer of products through which transport (diffusion) of aqueous reactants or products is rate-determin ing] during silicate-mineral weathering requires that (1) elements normally considered immobile (e.g., Al, Fe) behave conservatively; and (2) the volume ratio of product to…
Abstract Polyethylene foam experiments were conducted on a twin screw foam extruder to study the process effects upon foam nucleation. The results indicate that, other than quantity of nucleators, throughput rate and die opening are important process parameters, underscoring the importance of shear in the die on nucle…
Transmission measurements have been performed in reduced ${\mathrm{SrTiO}}_{3}$ between 300 and 17 K for different concentrations of oxygen vacancies. A midinfrared absorption band has been observed, whose behavior with doping and temperature is accounted for by an intraband scattering process, phonon or disorder assi…
In this study, we have confirmed the ability of liposome-encapsulated doxorubicin to modulate drug resistance, as previously observed in CH LZ cells (Thierry et al., Cancer Commun. 1, 311-316, 1989), in two human multidrug-resistant (MDR) cell lines, the breast cancer MCF-7/ADR cell line, and the ovarian carcinoma SKV…
Abstract The mechanism of esterification of cotton cellulose by a polycarboxylic acid was investigated using Fourier transform infrared spectroscopy (FT‐IR). The infrared spectroscopic data indicate that a polycarboxylic acid esterifies with cotton cellulose through the formation of an acid anhydride intermediate. A f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDihydroazulene/vinylheptafulvene photochromism: effects of substituents, solvent, and temperature in the photorearrangement of dihydroazulenes to vinylheptafulvenesHelmut Goerner, Christian Fischer, Sebastian Gierisch, and Joerg DaubCite this: J. Phys. Chem. 1993, 97, 16, 41…
The bulk modulus of \ensuremath{\beta}-boron has been measured up to 10 GPa by neutron powder diffraction using an opposed-anvil pressure cell. The bulk modulus of \ensuremath{\alpha}-boron has also been measured to 5 GPa by single-crystal x-ray techniques. The values have been determined to be 185(7) GPa for \ensurem…
This work analyzes the size and the boundary effects of a gallium arsenide- (GaAs) based quantum well (QW) structure on the thermal conductivity of the well material. Calculations show that the order of phonon mean free path (MFP) is equal to or even longer than the typical dimension of the well (-200 A or less). Holl…
Nickel oxide films were deposited by reactive RF magnetron sputtering. Optical and electrochemical characterization showed strong electrochromic activity under certain deposition conditions. X‐ray diffraction and infrared absorption measurements indicate that the films are polycrystalline and that the bulk crystal str…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelationship between energy and hardness differencesJose L. Gazquez, Ana Martinez, and Francisco MendezCite this: J. Phys. Chem. 1993, 97, 16, 4059–4063Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://p…
A transparent glass plate was roughened at the submicron level, and then a chemically adsorbed monolayer of a fluorocarbon compound was formed along the glass surface. The monolayer was prepared using the chemical coupling reaction accompanying dehydrochlorination between a chlorosilyl group of the heptadeca-fluorodec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas/vapor adsorption in imogolite: a microporous tubular aluminosilicateWilliam C. Ackerman, Douglas M. Smith, Jeffrey C. Huling, Yong Wah Kim, Joseph K. Bailey, and C. Jeffrey BrinkerCite this: Langmuir 1993, 9, 4, 1051–1057Publication Date (Print):April 1, 1993Publication…
The temperature dependence of infrared reflection spectra of single crystals of n-type strontium titanate doped with 0.3 to 1.5 at. % niobium are reported from 10 to 5 000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ in the temperature range 80--900 K. Results are analyzed by means of various factorized forms of the die…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton and carbon-13 NMR investigations of lead zirconate titanate (Pb(Zr,Ti)O3) thin-film precursor solutionsR. A. Assink and R. W. SchwartzCite this: Chem. Mater. 1993, 5, 4, 511–517Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Publish…
In a number of isostructural sesquioxides M 2 O 3 (M=Sc, In, Y, Yb, Dy, Ho, Sm, Gd) with the bixbyite structure the electric field gradients at substitutional 111 Cd nuclei show a regular and smooth dependence on the lattice constant. The electric field gradients allow the positions of all atoms in the unit cell to be…