Materials Literature
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The potential of sulphur-33 n.m.r. spectroscopy for chemical applications is explored. Data are presented for a range of compounds. Spectra have been obtained using both high-power and high-resolution systems. Moderately high field strengths were used (7.05 and 4.70 T), together with a special pulse sequence to reduce…
Synchrotron X-ray measurements are performed in both uniaxial (discotic and calamitic) and biaxial nematic lyomesophases of the mixture K-laurate, 1-decanol and D2O. A first-order band and a second-order band with spacing ratio 1 : 2 characteristic of a pseudo-lamellar structure are observed in the three nematic phase…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGold as a ubiquitous substrate for intense surface-enhanced Raman scatteringPing Gao, Mary L. Patterson, M. A. Tadayyoni, and Michael J. WeaverCite this: Langmuir 1985, 1, 1, 173–176Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Publish…
The high thermal conductivity, low rf loss, and inertness of diamond make it useful in traveling wave tubes operating in excess of 500 GHz. Such use requires the controlled etching of type IIA diamond to produce grating like structures tens of micrometers deep. Previous work on reactive ion etching with O2 gave etchin…
A ‘basket-handle’ iron-porphyrin bearing L-phenylalanine residues has been prepared and found to catalyse the epoxidation of p-chlorostyrene with a 50% excess of the (R)-epoxide, whereas ‘picket’ iron-porphyrins bearing the same amino acid have led to a 10–20% excess of the (S)-epoxide.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of a Dialkoxyiron(IV) PorphyrinJohn T. Groves, Robert Quinn, Thomas J. McMurry, Mikio Nakamura, George Lang, and Brian BosoCite this: J. Am. Chem. Soc. 1985, 107, 2, 354–360Publication Date (Print):January 1, 1985Publication History Published…
Description Contains 32 papers on accelerated corrosion test, including immersion, simulated atmosphere, electrochemical, and environmentally aggressive tests. Includes an appendix of 14 ASTM standard corrosion tests, practices, and definitions.
Abstract— The quantum yield of singlet oxygen generation (φ) was measured at 546 nm with the p ‐nitrosodimethylaniline (RNO) method. The results obtained in pH 7.4 phosphate buffer (PB) were: φ(HP) = 0.44 ± 0.05: φ= 0.71 ± 0.07: φ(HpD‐A) = 0.06 ± 0.02. The value of φ was constant from 3 to 67 μM , attributed to the do…
Reflectivity of an antireflection-(AR) coated laser-diode (LD) facet is analyzed on the basis of a slab waveguide model and an angular spectrum approach. The reflectivities of single- and double-layer AR coatings on 1.55-μm GaInAsP/InP LD's are numerically calculated. Optimum film parameters, such as thickness and ref…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of the monovalent nickel complex with 1,4,8,11-tetraazacyclotetradecane in aqueous solutions by N- and C-methylation. An electrochemical and pulse radiolysis studyNusrallah Jubran, Gregory Ginzburg, Haim Cohen, Yaacov Koresh, and Dan MeyersteinCite this: Inorg.…
The effect of the central metal atom on the photodynamic activity of phthalocyanine dyes has been estimated by cytotoxicity to cultured Chinese hamster cells. Chloroaluminium phthalocyanine,, followed by the Zn- derivate, were found to be the only active dyes. In parallel it was found that visible light (615 +/- 10 nm…
A beautiful striped texture is often observed as the initial response of a uniformly aligned nematic liquid crystal to a suddenly applied reorienting field The structure of the instability depends on the elastic and viscous anisotropy of the liquid crystal, the field strength, and in an important way on the boundary c…
Single crystals of the mixed-valence radical salt [NBu4]2[Ni(dmit)2]7·2CH3CN {ignoring the solvent molecules, the formula may be written as [NBu4]0.29[Ni(dmit)2]; H2dmit = 4,5-dimercapto-1,3-dithiole-2-thione} were obtained by galvanostatid oxidation of [NBu4][Ni(dmit)2] in acetonitrile. The crystal structure of this…
A version of the CNDO/S method has been re-parametrized by correlating computed and measured dipole moments and transition wavelengths for a range of organic conjugated molecules. The method has then been used to calculate the hyperpolarizability tensor, βijk, in the form related to second-harmonic generation, for an…
Abstract This volume is the direct result of an SEPM Research Conference held in October 1983 at Lost Valley Ranch, Colorado. The goal of the volume is to bring attention of the sedimentological community the importance of interaction of organic compounds with the inorganic sedimentary system and the degree to which o…
The general properties of the phases with the icosahedral point group and long-range orientational order are considered. 6 Goldstone modes — 3 phonons and 3 phasons — are shown to exist. A model for the microscopic structure — a 6-D crystal — is proposed, and phason modes are discussed in this framework. Bravais latti…
We discuss the phase transitions which can occur between two different cholesteric phases and we present general symmetry arguments why this transition has to be always of the first order. We derive the macroscopic dynamics close to the phase transition and we propose an experiment to shift the critical temperature wh…
In quantitative Electron Energy Loss Spectrometry, a weighted least squares estimation should theoretically be used to estimate the background law below core edge energy, since the variances of the data vary. However, it is found that proper weighting makes the above edge signal-to-noise ratio decrease rather than inc…
Current thermal spallation drilling methods offer advantages in performance and cost over conventional rotary methods. We have analyzed the mechanics of the thermal spallation process and found that heat transfer from the hot gases to the rock is the key process for limiting better penetration rates. Increasing the op…
Notch effects on strength were investigated for IG-11 and PGX graphite, which were promising materials for core structures of an experimental VHTR in Japan. Notch sensitivity in tensile strength tests decreased as notch radius decreased. Notch sensitivity of IG-11 was higher than that of PGX. Compressive fracturse of…