Materials Literature
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Nanotechnology is concerned with manufacturing to dimensions or tolerances in the range 0.1-100 nm. It plays a key role in many areas including materials processing, mechanical engineering, optics and electronics. Technologies for manipulating materials at or near the molecular level are coming increasingly into use.
It is difficult to delineate Cyclotella, Cyclostephanos and Stephanodiscus—the three most taxonomically diverse, predominantly freshwater genera of the Thalassiosiraceae. Cyclostephanos was originally distinguished by a Stephanodiscus-like exterior of fasciculate striae and raised radiating costae, and a Cyclotella-li…
The active form of aconitase has a diamagnetic [4Fe-4S]2+ cluster. A specific iron ion (Fea, which is lost during inactivation) is the binding site for substrate, as shown by Mössbauer spectroscopy. We have studied the mode of substrate and analogue binding at equilibrium to the paramagnetic [4Fe-4S]+ cluster of the r…
Fluctuations of corrosion potential have been analyzed for localized corrosion of Type 304 stainless steel immersed in solutions containing . Potential fluctuations were sampled by a microcomputer, and power spectra were calculated by the fast Fourier transform (FFT). Acoustic emission (AE) was also measured to invest…
Abstract Poly( L ‐lysine) was reacted with various azo‐reagents, including p ‐phenylazobenzoic acid, p ‐phenylazobenzoyl chloride, and p ‐phenylazobenzoic N ‐hydroxy‐succinimide ester, to give polypeptides containing 5–44 mol % azobenzene units in the side chains. The conformation of the azo‐modified polypeptides was…
Several freshwater naviculoid diatoms, for which Mereschkowsky erected the genus Placoneis, have been re-examined with light and electron microscopy. The findings reveal that, in addition to their distinctive chloroplast type, their valvar structure also differs significantly from that of Navicula sensu stricto, and t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDerivatized polyoxomolybdates. Synthesis and characterization of oxomolybdate clusters containing coordinatively bound diazenido units. Crystal and molecular structure of the octanuclear oxomolybdate (NHEt3)2(n-Bu4N)2[Mo8O20(NNPh)6] and comparison to the structures of the pa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of activated carbon by thermal decomposition of used automotive tiresSadao Ogasawara, Mikiya Kuroda, and Noriaki WakaoCite this: Ind. Eng. Chem. Res. 1987, 26, 12, 2552–2556Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Pub…
Domain splitting in the grains of ferroelectric ceramics reduces the internal elastic stresses which are caused by spontaneous deformation. Hysteresis switching reflects the increase or absence of internal stress. Small signal elastic and electric ac fields applied to the ceramic cause reversible domain wall motion th…
Nickel oxide ( NiO ) cathode solubility in the molten carbonate fuel cell (MCFC) electrolyte has been identified as one of the major technical obstacles facing fuel cell commercialization. The solubility of transition metal oxides is thought to be a function of the acid/base chemistry of the melt, controlled by the CO…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ photoreduced silver nitrate as a substrate for surface-enhanced Raman spectroscopyAngela M. Ahern and Robin L. GarrellCite this: Anal. Chem. 1987, 59, 23, 2813–2816Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Published inissu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBimetallic lanthanide complexes of the calixarenes: europium(III) and tert-butylcalix[8]areneBrenda M. Furphy, Jack M. Harrowfield, David L. Kepert, Brian W. Skelton, Allan H. White, and Faye R. WilnerCite this: Inorg. Chem. 1987, 26, 25, 4231–4236Publication Date (Print):De…
After briefly summarizing the most common reactions used in the chemical synthesis of polyoxyphenylenes, this paper reviews the electrochemical polymerization of phenols for metal protection. It also describes how the reaction media, sometimes in unexpected ways, influence the chemical composition of the coatings and…
A new method for the acid hydrolysis of protein is presented. Peptide bonds are cleaved by the action of an HCl/trifluoroacetic acid (TFA) vapor mixture. Contamination for the hydrolysis mixture is reduced to low levels (1-3 pmol). Recovery of hydrophobic amino acid is improved. Short reaction times are achieved and r…
The Stoner model of itinerant ferromagnetism in combination with self-consistent linear muffin-tin orbital non-spin-polarized calculations are used for analysis of metamagnetic behavior of fcc iron. The developed procedure enables one to identify all the possible ferromagnetic phases (stable, metastable, and unstable)…
A 104- to 105-times more intense absorption than the corresponding aqua complexes is exhibited by the cryptates 1 and 2; in the latter the ligand absorbs, in the former the metal ion. From the luminescence-lifetimes in H2O and D2O it can be deduced that in Eu nine or ten H2O molecules coordinate the Eu3⊕ ion, whereas…
Structural and electrical properties of rf-sputtered amorphous BaTiO3 thin films grown on water-cooled substrates have been investigated. The dielectric and electrical properties have been studied for films grown under varying sputtering gas composition (Ar+O2 gas mixtures) as a function of film thickness, frequency,…
The theory underlying the steady-state photocarrier grating technique is presented, including the effect of surface recombination. Experimental results for amorphous hydrogenated silicon and semi-insulating GaAs prove that diffusion lengths ranging from 200 Å to 10 μm can be measured with an accuracy of better than 5%.
The dissolution kinetics of TiO 2 powders in HF‐HCl solutions was studied as a function of time, temperature, and acid concentration. The rate of dissolution was linear with time, directly proportional to [HF], independent of [HCl], and exhibited an exponential temperature dependence with an activation energy of 74.9…
The zero-temperature value of the magnetocrystalline anisotropy (MCA) energy of trivalent rare-earth ions and its temperature dependence have been calculated for the whole series of the ${R}_{2}$${\mathrm{Fe}}_{14}$B compounds. The computations, performed with a single-ion origin of the anisotropy and within a molecul…