Materials Literature
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A four-spin coupling term is introduced to the pseudospin model Hamiltonian to account for the recently observed first-order phase transition in order-disorder ferroelectrics. The critical behavior is investigated and characteristic temperatures are calculated. We have also expressed the free energy in terms of micros…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of platinum loading on the photocatalytic activity and luminescence of cadmium sulfide powderToshio Uchihara, Michio Matsumura, Atsushi Yamamoto, and Hiroshi TsubomuraCite this: J. Phys. Chem. 1989, 93, 15, 5870–5874Publication Date (Print):July 1, 1989Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge storage on a conducting polymer in solutionM. J. Nowak, D. Spiegel, S. Hotta, A. J. Heeger, and P. A. PincusCite this: Macromolecules 1989, 22, 7, 2917–2926Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 July 1989…
The harmonic-balance finite-element method (HBFEM) is used to analyze the time-periodic magnetic field. The calculation is similar to that for the static nonlinear magnetic problem. The procedure is applied to a simple reactor with a saturated core and to calculate the field of an electromagnet. Comparison with result…
Multiconfiguration self consistent field (MCSCF) followed by multireference singles plus doubles configuration interaction (MRSDCI) calculations, including up to two million configurations, are carried out on low-lying electronic states of Pd3. In addition, spin-orbit effects are included using a relativistic configur…
In thinking about the states of condensed matter, we usually consider two extremes. At one extreme are crystalline solids, in which atoms form a perfectly periodic array that extends to infinity in three directions. At the other extreme are fluids or glasses, in which the atoms or molecules are completely disordered a…
Electrochemical kinetic parameters on copper plumbing surfaces were investigated under hydraulic and water quality conditions typical of distribution systems. The generally reported values of anodic and cathodic Tafel slopes were found to be inapplicable to plumbing surfaces of drinking water systems. Actual values ma…
Two Spanish palygorskites, one from Cáceres (Serradilla) and the other from Segovia (Sacramenia) are studied by means of infrared spectroscopy techniques, both in their natural state and after systematic treatment with hydrochloric acid. The first one is identified as aluminic and the second as magnesic. It is found t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry and radiation chemistry of colloidal semiconductors. 33. Chemical changes and fluorescence in CdTe and ZnTeUte Resch, Horst Weller, and Arnim HengleinCite this: Langmuir 1989, 5, 4, 1015–1020Publication Date (Print):July 1, 1989Publication History Published on…
Mechanism and effect of DC charge accumulation on the surface of a solid insulating support (spacer) have been studied in compressed SF/sub 6/ gas using various cylindrical model spacers. The distribution of surface charged is closely related to the normal component (gas side) E/sub n/ of electric field on the spacer…
Several new classes of polar and non-polar bicyclohexane liquid crystals comprising alkenyl side chains are presented. The compounds exhibit low optical anisotropies, Δn, < 0.1 and rotational viscosities, γ1, as low as 35 cP at 22°C. This leads, in combination with large elastic expressions k = k 1 + (k 3 - 2k 2)/4 >…
Abstracts A novel degumming process is described that is applicable to both undegummed and water‐degummed oils. Such totally degummed oils have residual iron contents below 0.2 ppm Fe and residual phosphorus contents that average below 5 ppm P. Therefore, they can be physically refined to yield a stable refined oil wh…
An experimental study of the dendritic growth of pivalicacid crystals in the presence of an external controlled Stokes flow is performed. A new experimental law, relating the value of product ${\ensuremath{\rho}}^{2}$V to the external flow velocity, is found.
The Preisach (1935) model has been discussed and extended in papers concerned with ferromagnetic phenomena. More recently, there is a growing interest in the Preisach model as an object of mathematical study. The author summarizes some of these results. Continuity properties and the inverse operator are discussed, and…
The iron and acid-labile sulfide contents and the electron paramagnetic resonance (EPR) properties of hydrogenase I (bidirectional) and hydrogenase II (uptake) of Clostridium pasteurianum (strain W5) have been determined on the basis of quantitative amino acid analyses. The iron and acid-labile sulfide values are appr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnhancement of nitric oxide dimerization by micropore fields of activated carbon fibersKatsumi Kaneko, Naomi Fukuzaki, Kazunori Kakei, Takaomi Suzuki, and Sumio OzekiCite this: Langmuir 1989, 5, 4, 960–965Publication Date (Print):July 1, 1989Publication History Published onl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state emission of dicyanoplatinum(II) and -palladium(II) complexes of substituted 2,2'-bipyridines and 1,10-phenanthroline and x-ray crystal structures of isomorphous M(bpy)(CN)2 (bpy = 2,2'-bipyridine; M = Pt, Pd)Chi Ming Che, Li Yan He, Chung Kwong Poon, and Thomas C…
Mechanism and effect of DC charge accumulation on the surface of a solid insulating support (spacer) have been studied in compressed SF/sub 6/ gas using various cylindrical model spacers. The distribution of surface charged is closely related to the normal component (gas side) E/sub n/ of electric field on the spacer…
We present a density functional approximation for the free energy of a system of hard bodies with arbitrary shape and orientational distribution. For systems with homogeneous density it reduces to existing treatments, which describe the isotropic liquid and the nematic liquid crystal. The treatment of the inhomogeneou…
Abstract The relationship between soil K forms (water soluble, exchangeable, HNO 3 ‐extractable, and mineral) as a function of clay mineralogy and taxonomy, was determined using 102 soils from the continental USA and Puerto Rico, representing 10 soil orders. These relationships may have use in evaluating potential soi…