Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal cracking of kerosineCarl E. Van Camp, Paul S. Van Damme, and Gilbert F. FromentCite this: Ind. Eng. Chem. Process Des. Dev. 1984, 23, 1, 155–162Publication Date (Print):January 1, 1984Publication History Published online1 May 2002Published inissue 1 January 1984https…
The tight binding calculation of the orbital magnetic susceptibility in Graphite Intercalation Compounds is reexamined to account for the different behaviour of Donor and Acceptor Compounds. The two dimensional tight binding model for π electrons treating symmetrically valence and conduction bands cannot explain exper…
A new device has been developed to measure the heat transfer properties of apparel fabrics and is reported in this paper with some examples of an application of this device. The basic functions of this device are as follows : (1) Detection of the heat absorption by a fabric ; This absorption starts just after the touc…
We have examined the relationship between surfactant structure and the sensation of tightness which ordinarily occurs on facial skin a few minutes after face washing. Most anionic surfactants cause various degrees of skin tightness, the order being, TEA-lauryl phosphate < potassium myristate = TEA-cocoyl glutamate < s…
The crystal structure of Sr-gehlenite Sr 2 Al 2 SiO 7 is tetragonal with space group P [unk]2 1 m , a = 7.820(1), c = 5.264(1) Å, Z = 2 and D x = 3.821 g · cm −1 , and was refined to R = 3.6% using 345 non-equivalent reflections. This compound is confirmed to be isotypic with gehlenite Ca 2 Al 2 SiO 7 . In this Sr-geh…
A range of diquaternary salts of 4,4′-bipyridine and 3,8-phenanthroline were prepared and subsequently screened using electrochemical and spectroscopic techniques. It was determined that the stability of the radical film deposited on cathodic reduction of aqueous solutions of these salts may be strongly influenced by…
MgO–NiO solid solutions can be reduced by H2 in two steps: in the first (temperature range 673–1093 K) mainly the Ni2+ ions located on the surface are involved, while in the second (T > 1093 K) those located in the bulk are also reduced.The dimensions of the Ni particles formed during the reduction process increase wi…
Transport coefficients measurements (electrical conductivity, Hall effect, thermoelectric power) have been performed on monocrystalline MoTe2 samples in a wide temperature range (77-700 K). The samples were prepared by a based Te flux method. Experimentals results are interpreted on the basis of a p-type semi-conducto…
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A new macrocyclic N-bridged species of formula [PcFe–N–FePc](Pc = phthalocyaninato anion, C32H16N82–) has been prepared by reaction of PcFe with NaN3 in α-chloronaphthalene and structurally and electronically characterized by i.r., visible, X-Ray powder, and e.s.r. measurements: one-electron oxidation leads to the cat…
Using a pair of backscattered electron detectors in the scanning electron microscope, images can be produced in which the intensity is dependent solely on the molecular weight of the imaged area, and independent of small fluctuations in topography. The use of this technique with polished, unetched cement sections, rev…
The authors present a method by which the number of steps required for the ultrastructural study of material originally embedded in paraffin can be greatly reduced. The process reduces deparaffinization, post-fixation, and re-embedding to four steps that take little more than 30 min to complete.
A development program is described in which reactor grade Zr-2.5Nb pressure tubes were produced with properties comparable to current reactor tubes but which are expected to show lower in-reactor creep and growth. Lower creep and growth rates would mean smaller axial elongations of tubes in service. Evaluation of the…
Abstract The viscosity behavior of aqueous poly(vinyl alcohol) (PVA)‐borax‐NaCl systems was investigated. The intrinsic viscosity [η] of PVA in borax solution increases with increasing borax concentration. In solutions containing both borax and NaCl, on the other hand, [η] decreases with increasing concentration of Na…
Corrosion inhibitive efficiencies of Biguanide monohydrochloride, Dicyandiamide, Guanyl urea-o-hydrochloride and Biuret have been determined by the gravimetric method. It has been shown that the energy eigen values, and the π-electron distributions of the compounds, obtained using the Hückel method, can offer a very u…
An attempt has been made to separate constituents of marine seston samples: inorganic material, detritus and the algal species, by density gradient centrifugation, without affecting the physiological state of the algae. A relatively inert gradient material, consisting of Percoll, salt and sucrose, was composed. Since…
Phosphomolybdic and a variety of phosphomolybdovanadic acids were examined as reoxidants for the palladium sulphate-catalysed oxidation of but-1-ene to butan-2-one both in the absence and the presence of oxygen. All of these co-oxidants were approximately equally effective in reoxidising Pd0 to PdII but they varied su…
X-ray photoelectron spectroscopy has been used to elucidate the state of chromium in the surface layers of CrHY and stabilized CrSY zeolites. Values of both the binding energy (EB) and the spin–orbit splitting (ΔE) of the Cr 2p level for chromium in the zeolite differ from those of bulk chromium oxide compounds or tho…
High resolution, low temperature photoluminescence spectra of manganese‐doped willemite single crystals have been measured. "Hot" bands on the zero‐phonon lines of the excited state of on inequivalent sites are observed at low Mn concentration between 4 K and 29 K. Their appearance is attributed to vibronic (Ham) quen…
X-ray photoelectron spectroscopy (X.p.s.) has been used to study the chemical nature of the oxide film initially produced on clean uranium metal in oxygen + water-vapour atmospheres. The rate of reaction has been monitored and the nature of the surface film determined. From a consideration of the O 1s and U 4ƒ X.p. sp…