Materials Literature
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We conduct numerical simulations of random packings of frictionless particles at T = 0. The packing fraction where the pressure becomes nonzero is the same as the jamming threshold, where the static shear modulus becomes nonzero. The distribution of threshold packing fractions narrows, and its peak approaches random c…
MoO3−x samples were prepared under different temperature and gas atmosphere conditions. The samples, which are all of the crystallographic MoO3 structure, have been investigated by XRD, SEM, diffuse reflection (DR) UV/VIS and Raman spectroscopies to characterize their properties as a function of the different concentr…
The dephasing of particle plasmons is investigated using light-scattering spectroscopy on individual gold nanoparticles. We find a drastic reduction of the plasmon dephasing rate in nanorods as compared to small nanospheres due to a suppression of interband damping. The rods studied here also show very little radiatio…
Abstract A combination of Laser Raman Spectroscopy, Secondary Ion Mass Spectrometry and Scanning Electron Microscopy has been used to investigate the influence of corrosion inhibitors on the mechanism of scale formation. In a series of experiments mixed barium and strontium sulphate scales were precipitated onto a ste…
When alpha,beta-unsaturated substrates bind to the active site of enoyl-CoA hydratase, large spectral changes can be observed [D'Ordine, R. L., et al. (1994) Biochemistry 33, 12635-12643]. The differences in the isotropic magnetic shieldings of the free and active site-bound forms of the carbonyl, alpha-, and beta-car…
Three completely different salts, (BET-TTF)ReO4 (1), (BET-TTF)3(ReO4)2 (2), and (BET-TTF)9(ReO4)4·2(THF) (3) are obtained by small variations in the electrocrystallization conditions of bis(ethylenethio)tetrathiafulvalene (BET-TTF) with the ReO4− ion. The crystal structures of the three salts show strong differences b…
Abstract A series of novel snake‐cage resins were synthesized using carboxymethyl chitosan (CM‐CTS) as the snake resin and urea–formaldehyde resin (UF) as the cage resin. Such factors as the optimal synthesis conditions, content of the crosslinking agent, and sorption capacities for metal ions of the above‐mentioned r…
We present the design for an optical spectrograph for the 6.5-meter Magellan II Telescope. The spectrograph covers the full visible spectrum in a single exposure at very high efficiency through a dual-channel design and the use of volume phase holographic (VPH) gratings in lieu of traditional surface gratings. A pair…
Mixing aqueous dispersions of thiocyanate ion coated small (< 3.5 nm diameter) gold nanoparticles and EDTA covered larger (> 22 nm diameter) silver nanoparticles, results in the formation of robust gold encased silver nanoparticles; in contrast to using larger (> 11 nm diameter) gold nanoparticles which forms chained…
Abstract Amine‐cured epoxy resins are prepared containing an aliphatic phosphonate additive which aids in the processing of the epoxy by reducing the viscosity of the resin mixture. The additive also acts as an antiplasticizer in the cured epoxy by increasing the modulus and yield strength under uniaxial tension and c…
Here we discuss the thermotropic and electrochemical properties and polymerisation of a series of N-substituted pyrrole monomers bearing mesogenic 4-substituted azobenzene attached as a pendant group via alkyl spacers. We discuss the effect upon these molecular properties of chain length and substitution of the azoben…
Abstract The effect of hydrate inhibitors on oilfield scale formation has been studied. A self-consistent activity model is presented to model the effect of methanol on carbonate equilibrium, calcite, barite, gypsum, celestite, and halite solubility in a gas/methanol/water/salt solution. The model uses Pitzer theory t…
A new series of liquid-crystalline bent-core molecules comprising a central 3,4‘-disubstituted biphenyl unit (biphenyl 3,4‘-bis-4-[4-dodecyl(oxy)benzoyloxy]benzoates) at which one, two, or even three H atoms in various positions were replaced by F atoms has been synthesized. The biphenyl cores were built up by orthome…
The interaction of nitric oxide with the surface of MgO at low temperature has been studied experimentally and theoretically. High-surface-area polycrystalline MgO prepared by chemical vapor deposition has been exposed to both 14 NO and 15 NO and the corresponding adsorption complexes have been monitored by means of e…
We report on investigations of spontaneous polarization echoes in the nonmagnetic multicomponent glass BaO-Al2O3-SiO2 in static magnetic fields. While the echo decay is only marginally influenced, the echo amplitude depends strongly on magnetic fields. It seems that the intrinsic magnetic moment of tunneling systems c…
Abstract A new technique is presented to detect scale deposition and to determine its composition and thickness in real-time in oilfield tubing and pipe. The method is based on continuous triple energy gamma-ray attenuation measurements made at a dedicated, instrumented mandrel or spool piece. Detection and identifica…
Today's large aperture telescopes have created a demand for diffraction gratings that are larger than the capabilities of the largest ruling engines. To overcome this obstacle, a method to produce a stable and passive assembly of two or more gratings is required. Replicated monolithic mosaics are produced by the simul…
Abstract Maleic anhydride was chemically attached to depolymerized natural rubber by a photochemical reaction. The product Carboxy Terminated Liquid Natural Rubber (CTNR) was characterized by 1 H‐NMR, IR, GPC, and TGA. The efficiency and permanence of CTNR were compared with conventional plasticizers in NBR vulcanizat…
An overview of the measured performance for a variety of volume-phase holographic (VPH) gratings is presented. Many of the gratings analyzed were developed as part of a National Science Foundation funded effort to explore the viability of this technology for astronomical applications. Additional emphasis is given to s…
Abstract As the industry moves towards increasing deepwater production, the very high cost of well intervention places large constraints upon the performance of scale control options. In particular, where scale is managed by squeeze treating, it is an absolute requirement that the treatment lasts as long as possible a…