Materials Literature
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Square cross-sectional holes with widths of about 1 nm can be formed in MgO crystals using circular cross-section high-current-density electron probes which are focused and oriented close to <001>. High-resolution scanning transmission electron microscopy has been used to reveal, on a unit cell scale, the three-dimens…
Attenuation of dopamine surface-enhanced Raman scattering (SERS) spectra at silver electrodes by protein adsorption is described. Polymer-modified electrodes eliminate protein adsorption effects. Partially hydrolyzed cellulose acetate coatings prevent protein adsorption and allow transport of dopamine to and from the…
The self-diffusion coefficients of b.c.c. metals are analysed assuming a two-defect model and different one-defect models. The two-exponential fits reveal large error limits for the diffusion parameters. Only for V, Nb and Na are highly accurate monovacancy diffusion energies evaluated. The analysis shows that for the…
It is becoming clear that the activity of the hydrogenase enzyme may be involved in the anaerobic biocorrosion of metal, particularly mild steel. Since all hydrogenases appear to be active in the reversible activation of the hydrogen molecule, hydrogenase from Clostridium pasteurianum was used as a test enzyme for inv…
Abstract This study examines the influence of different cellulose treatments, including coating by latex or by grafting with polymer/vinyl monomers, as well as with various additive dispersants (e.g., stearic acid or anhydrides) and coupling agents (e.g., maleic anhydride, abietic acid, and linoleic acid). The mechani…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA general synthetic route to 2,2':5',2''-terpyrrole, 2,5-di(2-pyrryl)thiophene, and alkyl-substituted analogsBryon A. Merrill and Eugene LeGoffCite this: J. Org. Chem. 1990, 55, 9, 2904–2908Publication Date (Print):April 1, 1990Publication History Published online1 May 2002P…
The Gibbs simulation technique has been extended to calculate the phase equilibria of fluids of particles exhibiting variable polydispersity, such as micellar solutions. The density-temperature sections of the phase diagrams and the distribution of particle sizes in the coexisting phases have been calculated for two v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic characterization of lanthanide octaethylporphyrin sandwich complexes. Effects of strong .pi..pi. interactionJohn K. Duchowski and David F. BocianCite this: J. Am. Chem. Soc. 1990, 112, 9, 3312–3318Publication Date (Print):April 1, 1990Publication History Publis…
The etching of (100)‐oriented n‐type silicon in solutions at 70°C was studied by kinetic and electrochemical measurements. In solutions with a concentration below etching is observed, while dissolution is inhibited when the concentration exceeds this critical value. In the latter case the silicon surface attains a pot…
Two series of asymmetric dimers, the α-(4-n-butylanilinebenzylidene-4′-oxy)-ω-(4-nitroazobenzene-4′-oxy) alkanes and the α (4-dimethylaminoanilinebenzyl-idene-4′-oxy)-ω-(4-nitroazobenzene-4′-oxy)alkanes have been synthesized. Their thermal properties are compared with those of the symmetric dimers, the α,ω-bis(4-nitro…
Polynomial (nonsingular) dynamical trace maps of generalized Fibonacci tilings (A,B\ensuremath{\rightarrow}${\mathit{A}}^{\mathit{m}}$${\mathit{B}}^{\mathit{n}}$,A) are derived for arbitrary values of m and n. It is shown that these sequences can be grouped into two distinct classes. The sequences in class I correspon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilities of trivalent metal complexes of phenolic ligands related to N,N'-bis(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid (HBED)Ramunas J. Motekaitis, Arthur E. Martell, and Michael J. WelchCite this: Inorg. Chem. 1990, 29, 8, 1463–1467Publication Date (Print):Apri…
Abstract Acrylamide has been polymerized between the layers of kaolinite by heat treatment. Acrylamide monomer was first intercalated by the displacement reaction between a kaolinite-N-methylformamide (NMF) intercalation compound and a 10% acrylamide aqueous solution. The resulting intercalation compound showed a basa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetalloporphyrin-catalyzed oxidation of saturated hydrocarbons with sodium chloriteJames P. Collman, Hiroo Tanaka, Robert T. Hembre, and John I. BraumanCite this: J. Am. Chem. Soc. 1990, 112, 9, 3689–3690Publication Date (Print):April 1, 1990Publication History Published onl…
Abstract Polyoxytetramethyleneglycol (PTMG) can be directly prepared from tetrahydrofuran (THF) and water in the presence of heteropolyacids (HPA), without the hydrolysis step. The reaction is carried out by mixing two liquid phases: the THF phase and a heteropolyacid catalyst phase. In this reaction the molar ratio o…
The affects of alkoxide‐derived coatings on the bending strength of silica glass were investigated. For densified coatings, increases in strength of 120% to 130% were found. A model of the strengthening process, based on the filling‐in and partial healing of surface flaws, is proposed. The model accounts for the tempe…
Surface-enhanced Raman spectrometry (SERS) of three sulfa drugs (sulfadiazine, sulfamerazine, and sulfamethazine) is reported. Silver colloidal dispersions prepared by simple borohydride reduction of silver nitrate are used as substrates. The capability of SERS for spectral fingerprinting of analytes with close struct…
In situ x‐ray diffraction (XRD) technique was employed to study unstable phases formed in sintered or anodically oxidized tungsten and molybdenum trioxide film electrodes under electrocoloration conditions in , in order to discuss their electrochromic characteristics on the basis of structural properties. The XRD patt…
Recent evidence is summarized showing that the tetragonal ( t ) → monoclinic ( m ) martensitic transformation in ZrO 2 can occur thermoelastically in certain ZrO 2 ‐containing ceramics, and that microcracking accompanying the transformation is more common than had previously been recognized. The implications of these…
Thermal oxidation kinetics of aluminum nitride (AlN) powders, having fine‐ and coarse‐particle‐size distributions, were studied using thermogravimetric analysis (TGA). The kinetics showed dependence on the particle‐size parameter, and the experimental TGA data were curve fitted using empirical mass relations employing…