Materials Literature
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The temperature dependence of the Pt L3-edge EXAFS spectra of the platinum clusters encaged in the cavities of the NaY-zeolite were observed by use of synchrotron radiation. A contraction of Pt-Pt bond by 0.07 Å from the distance in the bulk Pt metal is observed, which is likely to be associated with a strong electron…
Abstract This paper discusses recent examples of the progress made in our understanding of some of the basic physical mechanisms involved in the production of thermoluminescence in a selection of common TLD materials. Special emphasis is given to a discussion of the defects responsible for thermoluminescence in LiF, C…
Abstract In most PVC plastisol processing operations, gelation and fusion characteristics of the plastisol are critically important. For example, in chemically foamed plastisols, plastisol fusion temperature and blowing agent decomposition temperature must be carefully coordinated. In rotomolded parts, rates of gelati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleDevelopment of correlations among the spectral, structural, and electrical properties and chemical treatment of Egyptian cotton fabric stripsMorsy M. Abou-Sekkina, Mohamed A. Sakran, and Ahmed A. SaafanCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 4, 676–680Publication Da…
The effects of two commercial chitin synthesis inhibitors, dimilin and polyoxin D, on chitin fiber formation and cell sedimentation for the diatoms Thalassiosira fluviatilis and Cyclotella cryptica (Bacillariophyceae) were investigated. Dimilin treatments for both diatom species were indistinguishable from controls in…
It has been known for some time that electrochemical measurements are nonpredictive in inhibited concentrated hydrochloric acid at high temperatures. Extensive investigations into the weight loss to linear polarization (LP) rate ratio (R) have revealed the latter to be both very sensitive to the chemical nature of the…
Abstract The hydrogenation of benzene and methyl‐benzenes was performed over a nickel catalyst supported on the porous glass prepared from borosilicate glass with an alumina content ranging from 3% to 5%. The micropore size of the porous glass decreased with increasing alumina content. Although the overall reaction ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbonyl nitrosyl clusters. Syntheses and structures of [Fe5C(CO)13(NO)]-, [Fe6C(CO)13(NO)2]2-, and [Fe3(CO)8(NO)(NH)]-Andre Gourdon and Yves JeanninCite this: Organometallics 1986, 5, 12, 2406–2410Publication Date (Print):December 1, 1986Publication History Published online…
Abstract Authigenic chlorites occurring as pore linings in reservoir sandstones have been investigated by XRD and TEM/EDAX. Both methods identified the Ib ( β = 90°) polytype. TEM/EDAX analyses suggest that the chlorites are Al-rich, Mg-chamosites with Fe/(Fe + Mg) > 0·47. Octahedral Al exceeds tetrahedral Al, resu…
Abstract The observed thickness dependence and excitation profiles of the surface‐enhanced resonance Raman scattering (SERRS) from crystal violet (CV) on silver films demonstrated the importance of surface roughness and chemical effects. Using different normalization schemes in studying the excitation profile of SERRS…
ABSTRACT The frustule of Actinocyclus subtilis ( Greg.) Ralfs has been examined in detail with light and electron microscopy. The complex valve structure can only he appreciated fully by means of thin‐sections. The loculate areola is closed to the inside by a basket of organic material, which is supported by a system…
Foils made from pure iron with a porous structure were nitrided in mixtures of pure and entirely decomposed ammonia until constant weight was reached. The relationship between nitriding potential, temperature and concentration was measured in the ε region between 350 and 725°C and at concentrations between and . This…
The following new or updated patterns are submitted by the JCPDS Research Associateship at the National Bureau of Standards. The patterns are a continuation of the series of standard X-ray diffraction powder patterns published previously in the NBS Circular 539, the NBS Monograph 25, and in this journal. The methods o…
Abstract TL in sintered CaB4O7 doped with activators, such as Eu, Dy and also Pb and Cu, has been investigated. For a heating rate of 20 oC.min-1, the TL glow peaks can be roughly grouped into three temperature regions: (I) 75~110 oC, (II) 170~190 oC, and (III) 255~275 oC. Their emission spectra depend on the activato…
This paper presents a systematic and rational formulation of the electromagnetic theory of deformable and fluent bodies swept out by singular surfaces that may carry their own thermodynamics (interfaces). The treatment is based on the principle of virtual power for finite velocity fields, which is so formulated that,…
Abstract Regularly interstratified chlorite/smectite (corrensite) occurs as grain coatings in marine and eolian sandstones of the Permian Cutler Formation in Lisbon Valley, Utah. Corrensite dominates the <2- μ m clay size fraction along with lesser amounts of regularly interstratified illite/smectite in bleached, p…
An experiment has been undertaken to see if chemical sputtering of carbon can be directly observed under tokamak operating conditions. The test material consists of a well instrumented graphite probe limiter which can be heated up to 900°C under steady state conditions and up to >1200° C with additional plasma heating…
Abstract This paper begins with a brief description of the history of development of PVC plastisol. It, then, presents technical background on the nature of PVC plastisol, covering subjects of particle size distribution and nature of agglomerates, viscosity aging and deagglomeration, rheology of suspension, gelation a…
A summary of the bubble pulsation dynamics of an underwater explosion is presented with the aim of establishing the whipping response of a nearby surface ship. The effects of the initial shock front are not considered and the fluid is assumed to be an incompressible medium. The gas bubble volume dynamics can then be r…
We observe via freeze-fracture transmission electron microscopy the transition from the disklike micellar nematic phase to the lamellar smectic phase of decylammonium chloride-ammonium chloridewater as a function of temperature. We show direct visual evidence of the size and shape of the aggregates in the nematic phas…