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Abstract The theory of Cahn and Hilliard is used to derive an equation for the interfacial tension (free energy) between some demixed polymer solutions, applying a simple solution model treated by Debye in his theory of light scattering near the critical solution temperature. For a (symmetrical) system containing two…
Abstract Previously obtained dynamic shear modulus data over a wide amplitude range of rubber vulcanizates loaded with carbon blacks of widely varying structure as well as graphitized black were augmented with dynamic conductivity data at 30° C and at 100° C. Results confirm the existence of reversible transient and i…
The effects of certain variables on a-lactose crystallization were examined. The temperature for optimum crystallization rate varied with the initial supersaturation. Crystallization rate was not directly proportional to seed crystal surface area, probably because of false graining or because mutarotation has a limiti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT ADVANCES IN RHENIUM CATALYSTSWilliam H. Davenport, Valerie. Kollonitsch, and Charles H. KleinCite this: Ind. Eng. Chem. 1968, 60, 11, 10–19Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the addition of hydridopentacyanocobaltate(III) to some .alpha.,.beta.-unsaturated compoundsJack Halpern and Lai-Yoong WongCite this: J. Am. Chem. Soc. 1968, 90, 24, 6665–6669Publication Date (Print):November 1, 1968Publication History Published online1 May 2002P…
The thermal expansion of structures with frameworks of linked octahedra may be broken up into two parts: the changes in shape and size of individual octahedra, and their changes of tilt relative to one another. Expansion due to the second cause, when allowed by symmetry, is generally much greater than expansion of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Ion Valency on the Bulk Physical Properties of Salts of Ethylene-Acrylic Acid CopolymersSergio Bonotto and Eugene F. BonnerCite this: Macromolecules 1968, 1, 6, 510–515Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published…
Abstract An adiabatic Nernst-Type calorimeter with a cell for condensing a sample vapor as an amorphous state was constructed. By making use of this calorimeter, the heat capacities of the glassy, supercooled liquid, and crystalline states of methanol were measured from 20°K to 120°K. It was found that the state of me…
At 95–115°, paraformaldehyde and hydriodic acid completely C-methylate aromatics such as benzene and phenol. Pyrroles are C-methylated similarly, carbethoxy and acetyl groups being lost. In hydriodic acid at 15–45°, typical pyrroles retain these groups and all free positions are C-alkylated, methylated by paraformalde…
This paper demonstrates how molecular orbital theory can be useful in obtaining chemical information from x-ray absorption spectra. Basic molecular orbital theory concepts such as symmetry and overlap of wavefunctions are used to explain the K-absorption spectra of first-row transition metal complexes. In x-ray K-abso…
The (0001) face of α-Al2O3 has been studied with low-energy electron diffraction. A surface etched with hot phosphoric acid showed the two-dimensional hexagonal 1×1 lattice expected of the bulk (0001) plane. This 1×1 lattice coincides with the lattice of aluminum atoms in this plane. Heating a freshly etched crystal t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPurification and mechanism of action of proline racemaseGeorge J. Cardinale and Robert H. AbelesCite this: Biochemistry 1968, 7, 11, 3970–3978Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://doi.o…
Research Article| November 01 1968 Enzyme-catalysed reactions of polycyclic hydrocarbons with deoxyribonucleic acid and protein in vitro P L Grover; P L Grover 1Chester Beatty Research Institute, Institute of Cancer Research: Royal Cancer Hospital, London, S. W. 3 Search for other works by this author on: This Site Pu…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Henri Arsenault, "Diffraction Theory of Fresnel Zone Plates," J. Opt. Soc. Am. 58, 1536-1536 (1968) Export Citation BibTex Endnote (RIS) HTML Plain Tex…
The room-temperature reflectance of evaporated amorphous selenium films was obtained between 4 and 14.4 eV. The reflectance spectrum was the same for fresh samples evaporated onto substrates held at 10°, 24°, and 60°C; however, aged selenium films had a 25% lower reflectance between 9 and 14 eV while between 4 and 5 e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformations and crystal packing. The crystal and molecular structure of trans-bis(2,4-pentanedionato)dipyridinenickel(II), Ni(AA)2(py)2Richard C. ElderCite this: Inorg. Chem. 1968, 7, 11, 2316–2322Publication Date (Print):November 1, 1968Publication History Published onlin…
The structural, dielectric, and piezoelectric properties of the solid solution (Na 1‐x ,Li x ,)NbO 2 were studied. Solid solution ceramics with x values up to 0.14 occur as a single phase. The phase diagram from 0° to 600°C is given. The low‐temperature phase has a perovskite pseudo‐monoclinic structure and inverts to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIon-exchange equilibriums between glass and molten saltsHarmon M. GarfinkelCite this: J. Phys. Chem. 1968, 72, 12, 4175–4181Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://pubs.acs.org/doi/10.102…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTManganese porphyrin complexes. I. Synthesis and spectroscopy of manganese(III) protoporphyrin IX dimethyl ester halidesLaurence J. BoucherCite this: J. Am. Chem. Soc. 1968, 90, 24, 6640–6645Publication Date (Print):November 1, 1968Publication History Published online1 May 20…
The diffusion of oxygen in monocrystalline ScaO 3 , YzO 3 , Dy,O 2 , HosO 3 , Er 2 O 3 , Tm 2 O 2 , and Lu 2 O 3 was measured by a thermobalance technique. The reoxidation of partially reduced crystals of these materials was treated as a diffusion‐controlled process with a moving boundary. Large diffusion coefficients…