Materials Literature
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In this report, controls of polymorphism and morphology of calcium carbonate compounds were studied by suspending amorphous calcium carbonate hydrate (ACC) powder in water or MgCl2 solution. Characteristics of calcium carbonate compounds formed from ACC were determined by means of X-ray diffraction, thermal analysis (…
The complexes [LnL2(NO3)2]NO3·nMeOH [L = 2,6-bis(benzimidazoi-2-yl)pyridme, Ln = Ce 1, n= 3; Ln = Eu 3 or Tb 4, n= 2] have been characterized by single-crystal X-ray diffraction, IR and 1H NMR spectroscopy and molar conductivity. They are ten-co-ordinate with six nitrogen atoms from two tridentate L ligands and four o…
Samples of Pt-10% Ir have been studied by X-ray photoelectron spectroscopy (XPS) to assess environmental contamination of reference kilogram masses. Samples were sputtered clean and distributed to four places where reference kilograms are kept at the NPL. All four specimens showed carbon and oxygen contamination which…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton diffusion in the pores of silicate sol-gel glassesJohn McKiernan, Eric Simoni, Bruce Dunn, and Jeffrey I. ZinkCite this: J. Phys. Chem. 1994, 98, 3, 1006–1009Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 Janu…
This evaluation of techniques, apparatus, and dedicated facilities for measurement of very low levels of radioactivity is addressed to the large community of researchers who use radioactive tracers, make activation analyses, etc. and may occasionally face the problem of measuring an activity well below the level acces…
have been synthesized and their molecular structures have been also determined by single-crystal X-ray diffraction technique. The space groups, unit cell parameters, and R factors are as follows: Compound A, monoclinic, , a= 19.074 (3), b=21.490 (3), c=15.183 (2) =109.67 (1) ; z=8; R=0.075($IF_0I>4{\sigma}(IF_0I);$ Co…
The detection of surface stress in materials is becoming increasingly important in failure analysis. In the case of ferromagnetic steels, the Barkhausen effect provides a practical tool for surface stress evaluation. However, one of the drawbacks of the method has been the lack of an underlying model theory for use in…
Abstract Highly branched polyphenylenes, polyphenylene ethers, aromatic polyesters and polyamides synthesized from AB 2 type monomers are reviewed. Polyphenylenes were obtained by aryl‐aryl coupling reactions of 3,5‐dihalo‐phenyl organometallic reagents. 13 C NMR indicates about 70% branching efficiency. A T g at 236°…
Abstract Infrared and single crystal Raman spectra for various polarization geometries of Triglycine Sulpho‐Phosphate (TGSP) have been recorded and analysed. The bonds of hydrogen atoms in H 2 SO 4 and H 3 PO 4 groups are shown to be weak and the possibility of proton transfer from H 2 SO 4 /H 3 PO 4 group is indicate…
The photoelectrochemical behavior of 304 stainless steel coated with TiO2 by sputtering was studied in NaCl solutions at ambient temperature. It was confirmed that the coating from 30 to 100nm thick could protect 304 stainless steel cathodically under illumination. The coating defects don't hinder the protection perfo…
Synthetic models of the photosynthetic antenna complexes must achieve long-range 3-dimensional order encompassing a large number of porphyrinic pigments with limited direct contact of the pigments. In order to develop solid-state antenna complexes, we have synthesized porphyrins bearing benzyloxy groups projecting ove…
The majority of polyurethanes are crosslinked thermoset polymers, which cannot be recycled by melting and extrusion processes without excessive degradation. Sev eral recycling techniques for polyurethanes have been described in technical and scientific literature and are used industrially, such as rebonding of flexibl…
A new method for predicting the deformation behaviour and the related mechanical properties of weft-knitted fabrics is presented. A two-dimensional hexagonal mechanical model is derived, which is based on the geometrical structure of plain-stitch fabric. An analytical method of converting the experimental data of the…
α-Aluminum bronze (Copper [Cu]-7% Al) (UNS C61400) was found to be susceptible to stress corrosion cracking (SCC) in 3.4% NaCl under relatively high anodic potentials (≥ 300 mVNHE), i.e., greater than 200 mV more positive than the free-corrosion potential. The time to failure and stress ratio (σ soln/σ air) were mildl…
This paper elaborates on a new approach introduced in an earlier paper for the steady-state and transient analysis of synchronous machines and demonstrates the validity and accuracy of this model for system studies. The approach is based on developing an equivalent flux linkage circuit model from the dimensions and ma…
The first well-characterised example of a heteropolymetalate involving palladium, [Pd2W10O36]8–, contains two W5O186–‘ligands’, each bridging between two four-coordinate palladium(II) ions in square-planar environments, defined by an X-ray crystal structure analysis.
A novel conjugated polyelectrolyte, poly(propynyltriphenylphosphonium bromide) has been synthesised using transition metal catalysts in quantitative yield.
We have developed theoretical models for analysis of X-ray diffuse scattering from protein crystals. A series of models are proposed to be used for experimental data with different degrees of precision. First, we propose the normal mode model, where conformational dynamics of a protein is assumed to occur mostly in a…
This paper concerns transient sorption measurements in two intervals (54 to 75% and 75 to 84% relative humidity) made on samples of pine, spruce, ash, aspen, cherry, and willow, with the flow in different directions.In the lower interval, the sorption behavior is quite Fickian; but in the higher interval, it is largel…
Chemical stabilization of β‐cristobalite has been achieved using two methods: (1) incorporating “stuffing” cations Na, Ca, Cu, and Sr into the cavities in the tectosilicate framework, as previously reported, and (2) without “stuffing” cations, by substituting AlPO 4 into the framework. XRD, TEM, FTIR, DSC, and solid‐s…