Materials Literature
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Nanotechnology offers a vision for a ‘smart’ drug approach involving the design, synthesis, and characterization of materials and devices that have a functional association in nanometer scale. One area in which nanotechnology may have a significant clinical impact in neuroscience is the selective transport and deliver…
Polycrystalline NiFe2O4 was prepared by solid state reaction from nano size powder of NiO and Fe2O3 which were synthesized by wet chemical method. The inverse spinel single phase of the sample has been confirmed by the X-ray diffraction patterns. SEM micrographs of the samples revealed that the grain size increases an…
The dissolution into water of barium sulphate labelled with 35S has been studied from 10.5 to 35°C. The kinetics proved to be second order to at least 85 % saturation, the activation energy being 24.7 ± 0.8kJ mol–1. Diffusion control of the dissolution process was not observed.
The work of adhesion, depending solely on the contact angle and surface tension, is unreliable as a guide to the strength of a joint. The kinetics of joint formation, exemplified by the rate of wetting, is also important and can be measured by rate of change of contact angle, a process for which an empirical equation…
An exact theory for the two-magnon bound state problem in the Heisenberg ferromagnet with arbitary spin S and arbitrary dimensionality is developed at absolute zero temperature. The Hamiltonian which describes the system is assumed to include a nearest neighboring anisotropic exchange interaction and a one-ion type an…
Alnico 8-type magnet alloys containing more than 5% Ti have been well-known to have very high coercive forces, particularly when the isothermal field treatment is applied. As a primary approach in this research to explore its cause, the transformations, microstructures and magnet characteristics were investigated in a…
Synopsis The microscopic structure of the outermost layer of the outer shell membrane containing decalcified mammillary cores of some of the egg shells laid by a large flock of Shaver 288 Starcross hybrids from November 1967 to September 1968 has been examined. It has been found that a high percentage of the weak and…
The preparation of a meso-thiaphlorin, meso-thiaporphin, and a porphin analogue containing two thiophen rings is described together with several examples of extrusion of sulphur from polypyrrole macrocycles.
Bentonite clay collected from Jabal Umm Ali area NE of Khartoum (Sudan) was characterized by X-ray diffraction (XRD). It was then purified by treatment with distilled water and activated with sulfuric acid at 90 ºC for 3.5 hrs. XRD indicated modification of activated bentonite with enhanced surface area. Several catio…
The luminescence of Yb 2+ in alkaline earth phosphates and vanadates is reported. Particular attention has been given to those compositions possessing apatite and spodiosite structures. Emissions from Yb 2+ are broad and sensitive to host composition. Single and double emission bands are observed which exhibit a varie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetabolic fate of phenyltrimethylsilane and phenyldimethylsilaneRalph J. Fessenden and Ray A. HartmanCite this: J. Med. Chem. 1970, 13, 1, 52–54Publication Date (Print):January 1, 1970Publication History Published online1 May 2002Published inissue 1 January 1970https://pubs.…
The corrosion behavior of zinc in at 25° C was investigated through measurement of the rate of hydrogen evolution at the corrosion potential. Anodic and cathodic potentiostatic polarization curves as a function of alloying and additions to the electrolyte were obtained. It was found that the corrosion and polarization…
The crystal structure of benzylideneacetophenone (chalcone) has been solved from photographically recorded partial three-dimensional data by means of the SEARCH computer programme and refined to discrepancy indices R′= 0·017 and R= 0·055. The C–C and C–O bond lengths have been determined with estimated standard deviat…
Abstract The technique of two‐photon‐absorption spectroscopy with polarized laser‐light is applied to localized excitations of 4f‐electrons in crystals. The relevant selection rules are discussed. A method is outlined for the unique determination of the relative magnitude of partial transition‐probabilities with diffe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence of 2,2',2"-terpyridineDavid W. Fink and William E. OhnesorgeCite this: J. Phys. Chem. 1970, 74, 1, 72–77Publication Date (Print):January 1, 1970Publication History Published online1 May 2002Published inissue 1 January 1970https://pubs.acs.org/doi/10.1021/j100696…
Previous measurements of the thermal conductivity of TiC, ZrC, and NbC by the present authors showed that at low temperatures the phonon‐electron scattering in these materials is strong and gives rise to an unusual temperature dependence of the lattice thermal conductivity. The Callaway analysis of those data is now e…
Tetrafluorophthalonitrile reacts with a variety of metals and metal halides to give halogenophthalocyanines. The reaction with zinc, zinc bromide, or zinc iodide gives zinc hexadecafluorophthalocyanine in good yield, but zinc chloride, iron(III) chloride, and aluminium chloride react to give mixtures of polychloropoly…
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Polycrystalline copper of 99·99% purity has been deformed in tensile creep at a variety of strain rates and temperatures. The internal stress developed during creep deformation was measured by a modified stress-relaxation technique. The magnitude of the internal stress remains constant during steady-state deformation…