Materials Literature
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Abstract The 57 Fe Mössbauer spectra of an iron-rich montmorillonite, an illite, and two glauconites were measured and computer-fitted with appropriate Fe 3+ and Fe 2+ doublet resonances. The broad experimental Fe 3+ resonance of montmorillonite probably arises from Fe 3+ in the octahedral sites and a trans-arrangemen…
Abstract Lanthanoid(III) picrates (Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, and Yb) were prepared from picric acid and the corresponding lanthanoid carbonates in good yields. Combustion analyses, ICP emission analyses, and UV spectrophotometry have shown that the light lanthanoid picrates, i.e. Ln=La–Gd, are all undecahydra…
Abstract Silico-ferric coprecipitates, with chemical formula , were aged in suspension at 75°, 100° and 150°C and the structural evolution of solids with time studied by XRD, TEM, and IR, Mössbauer and EXAFS spectroscopy. The initial Si-Fe coprecipitate was found to be amorphous but showed local order similar to that…
Abstract Temperature-programmed desorption (TPD) and IR spectroscopy were used to characterize the number and strength of acid sites in Al 3+ -, Cr 3+ - and Fe 3+ -exchanged montmorillonite. The bases pyridine and n -butylamine occupied three different sites in the interlamellar space: (i) physisorbed base, (ii) base…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExploration of structure, electron density distribution, and bonding in coesite with Fourier and pseudoatom refinement methods using single-crystal x-ray diffraction dataK. L. Geisinger, M. A. Spackman, and G. V. GibbsCite this: J. Phys. Chem. 1987, 91, 12, 3237–3244Publicat…
Abstract Formaldehyde and di‐methylomelamine were used to modify the surfaces of cellulose fibers. Composites were prepared with unsaturated polyester and treated cellulose as the reinforcing material. The tensile strength and the elongation of the cellulose fibers were determined in dry and wet conditions as well as…
Abstract The solution properties of water‐soluble drug carriers based on copolymers of N ‐(2‐hydroxypropyl)methacrylamide containing p ‐nitroaniline (drug model) attached to the copolymer by enzymatically degradable oligopeptide chains, were studied using light scattering, GPC and sedimentation methods. It was found t…
Thermal degradation of PMMA subjected to a radiant heat flux was studied both experimentally and numerically. Very accurate measurements of mass loss rate and temperature profiles were performed for three constant heat fluxes: 1.5,2.3 and 3.0 W·cm-'. The results show that the mass loss rate cannot be directly related…
The cytochemical reactions of the attachment mucilage of 12 diatom genera (total 17 species) have been examined. These organisms are all found as members of fouling communities and, in some cases, are the dominant component. In every case the mucilages were found to be exclusively polysaccharide, except in Berkeleya r…
Simple empirical formulas for perpendicular and parallel polarization susceptances for a meander-line grating plate are given. The numerical results compared favorably with experimental data and published data. Simple transmission-line model in terms ofE-type mode andH-type mode for multilayered meander-line polarizer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonochemistry of aqueous solutions: hydrogen-oxygen combustion in cavitation bubblesEdwin J. Hart and Arnim. HengleinCite this: J. Phys. Chem. 1987, 91, 13, 3654–3656Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Published inissue 1 June 1…
We present general solutions of the inhomogeneous linear elastic equations for pentagonal quasicrystals. The equations are those obtained by minimizing the harmonic elastic energy which includes a nontrivial coupling between the phason and displacement variables. Our solutions are presented in terms of the Green's fun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA comprehensive investigation of the photophysics and photochemistry of salicylideneaniline and derivatives of phenylbenzothiazole including solvent effectsRalph S. Becker, Christian. Lenoble, and Abudi. ZeinCite this: J. Phys. Chem. 1987, 91, 13, 3509–3517Publication Date (…
Abstract Current research concerning the physical, chemical, and biological processes governing biofilm formation and peristence is reviewed. Biofilm formation processes are explained. Potential research directions in the areas of physical, biological, and genetic control of biofilm processes are also presented.
Classical soft-mode behaviour above the phase-transition temperatures is discussed phenomenologically and the discussion is applied to paraelectric phases of sixteen well known and most investigated ferroelectrics of both displacive and order-disorder type. The experimental dielectric spectra ε'(v) and ε''(v) are obta…
High-intensity femtosecond pulses tunable in the 0.8–1.6-μm range have been generated by parametric amplification of a continuum white light in a new organic crystal, N-(4-nitrophenyl)-L-prolinol (NPP). The traditional concept of noncritical phase matching was revised in view of requirements linked to the observation…
Off-axis uniaxial testing is used to characterize the nonlinear behavior of boron/ aluminum composite. An orthotropic elastic-plastic formulation is used.
X-ray scattering carried out in situ during electrochemical doping indicates an unusual sequence of structural transitions. On doping to \ensuremath{\approx}6-7 mole%, lightly doped regions coexist with a discommensurate-domain channel structure. As the Na concentration increases, the density of domain walls decreases…
Abstract A new quantitative X-ray powder diffraction (QXRPD) method has been developed to analyze polyphase crystalline mixtures. The unique approach employed in this method is the utilization of the full diffraction pattern of a mixture and its reconstruction as a weighted sum of diffraction patterns of the component…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrescription for stabilization of ferromagnetic exchange in molecular solids via admixing of the ground state with a virtual charge-transfer excited stateJoel S. Miller and Arthur J. EpsteinCite this: J. Am. Chem. Soc. 1987, 109, 13, 3850–3855Publication Date (Print):June 1,…