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The cross section for total scattering by clusters of spheres is derived from an integration, over a closed spherical surface, of the scattered Poynting flux associated with the different pairs of spheres in the ensemble. With the use of the addition theorem for vector spherical harmonics the integral can be evaluated…
This paper presents the study of the nature and conservation state of different stuccos and Roman concretes from the Roman city of Baelo Claudia (Cádiz). The chemical, mineralogical and microstructural compositions of the said materials have been established. Different causes of their decay have been found, among whic…
The effect of changing pH on the dispersion of clay from sodic soils was investigated in relation to changes in net charge on clay particles. A positive relationship was obtained between pH and the percentage of dispersible clay for each soil clay. The percentage increase in net negative charge was also positively cor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of a Molybdenum Disulfide NanoclusterZhi Jun Zhang, Jun Zhang, and Qun Ji XueCite this: J. Phys. Chem. 1994, 98, 49, 12973–12977Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTAmide-Water and Amide-Amide Hydrogen Bond StrengthsDavid A. Dixon, Kerwin D. Dobbs, and James J. ValentiniCite this: J. Phys. Chem. 1994, 98, 51, 13435–13439Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994ht…
Cyclic voltammetry (CV) is a dynamic electrochemical method for measuring redox events. This summary of recent developments in the use of CV in materials science will be particularly useful for newcomers to the field. Following an introduction to the principles of CV, the current status of investigations of various ty…
Abstract This is a review on the long‐term behavior of polyolefin pipes used in hot‐water environments. Included in the review is work done on pipes of crosslinked polyethylene, isotactic poly(butene‐1), isotactic polypropylene and medium‐density polyethylene, and in particular the extensive work performed at Studsvik…
In the ZrO 2 -YO 1.5 solid solutions, the phase changes among the cubic phase (Fm3m, Z=4), the t″ form and the t' form were investigated by neutron and X-ray powder diffraction, where the t″ and t' forms are defined as tetragonal phases (P4 2 /nmc, Z=2) with axial ratios of c/a f =1 and c/a f >1, respectively, which w…
The room‐temperature tetragonal‐to‐cubic transformation in BaTiO 3 powders with decreasing particle size has been carefully studied, using materials prepared mainly by hydrothermal methods. Hydrothermal BaTiO 3 powders exhibited a more uniform particle size distribution than oxalate‐route powders, with X‐ray diffracti…
Pattern decomposition programs are able to derive, from the measured powder diffraction patterns, estimates of the square moduli of the structure factors. A method is described that, by statistical analysis of the normalized structure-factor moduli, is able to obtain information about the possible presence of preferre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Catalysis of Novel Colloidal Dispersions of Copper/Noble Metal Bimetallic ClustersNaoki Toshima and Yuan WangCite this: Langmuir 1994, 10, 12, 4574–4580Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon Nanofibers: A Unique Catalyst Support MediumNelly M. Rodriguez, Myung-Soo Kim, and R. Terry K. BakerCite this: J. Phys. Chem. 1994, 98, 50, 13108–13111Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1…
Electrical and photoelectrical properties of nondoped and doped zinc oxide films coated on glass plates by the dip-coating method are investigated at room temperature in various ambient atmospheres. The dark conductivity of the nondoped films exponentially decreased with decreasing film thickness while the conductivit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass Transition Temperatures of Polymers from Molecular Dynamics SimulationsJie Han, Richard H. Gee, and Richard H. BoydCite this: Macromolecules 1994, 27, 26, 7781–7784Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue…
Transition metal ions doped into TiO_2 can increase the quantum efficiency of the heterogeneous photooxidation of chlorinated hydrocarbons. In this regard, a single dopant (vanadium) has been selected for a detailed investigation to elucidate the mechanism of the dopant action on the photoreactivity of TiO_2. Large po…
A method is developed that yields the residual stress, the orientation distribution coefficients, the average crystallite dimension, the microstrain, and the crystal structure parameters from x-ray diffraction data in a single-step procedure. To this end, a general approach is introduced that combines the equations of…
Ruthenium polypyridyl compounds, cis-[4,4'-(CO2H)(2)-2,2'-bipyridine]Ru-2(X)(2) and cis-[5,5'-(CO2H)(2)-2,2'-\nbipyridine]Ru-2(X)(2) where X = Cl-, CN-, and SCN-, have been prepared, spectroscopically characterized, and anchored to high\nsurface area TiO2 electrodes for the conversion of visible light into electricity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiomimetic Chemistry of NickelMalcolm A. Halcrow and George ChristouCite this: Chem. Rev. 1994, 94, 8, 2421–2481Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/cr00032a00…
Transient measurements of thermal conductivity, thermal diffusivity, and specific heat capacity have been performed with hot disk sensors in thin samples of metallic materials. With this new variation of the hot disk method the sample size can be reduced to a volume less than ten cubic centimeters for copper at room t…
We present ab initio calculations of the structural, cohesive, and electronic properties of various polymorphic forms of carbon and boron nitride. Our calculations are based on ultrasoft pseudopotentials and a variational approach to the solution of the Kohn-Sham equations. Optimization of the atomic geometries is per…