Materials Literature
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Metal complexes composed of ZnCl(2) and bidentate 1,2-bis(2-methyl-5-(4-pyridyl)-3-thienyl)perfluorocyclopentene (1a) and monodentate 1-(2-methyl-5-phenyl-3-thienyl)-2-(2-methyl-5-(4-pyridyl)-3-thienyl)perfluorocyclopentene (2a) photochromic ligands were prepared. X-ray crystallographic analyses showed the formation o…
Abstract Precipitation of mineral scales causes many problems in oil and gas production operations: formation damage, production losses, increased workovers in both producers and injectors, poor injection water quality and equipment failures due to under-deposit corrosion. The most common mineral scales encountered wi…
Abstract Scale control is conventionally achieved by use of chemical inhibitors, introduced to the production system either by squeeze treatment into the reservoir or continual injection into the well. However, as new field developments encounter more challenging production environments or when the associated economic…
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The influence of the ions present in a liquid crystal on the dynamical response of a nematic slab submitted to a dc voltage is studied. The evolution of the system toward the equilibrium state is investigated by solving the continuity equation for the electric charge, taking into account the current of drift and of di…
Three-dimensional particle crystals made of dicarboxylic thiolate (MSA)-stabilized gold nanoparticles were formed at an air/water interface. FTIR spectra of this supracrystal showed that three well-resolved peaks existed from 3400 to 3550 cm-1 just falling in a region of OH stretching vibrational mode. Precise analysi…
A series of transition-metal sulfide one-dimensional (1D) nanostructures have been synthesized by means of a general atmospheric pressure, chemical vapor deposition (APCVD) strategy. Vapour-liquid-solid (VLS) and vapour-solid (VS) mechanisms, along with the results of SEM and TEM observations, were used to explain the…
Well-defined supramolecular assemblies of Zn and free-base porphyrins are constructed through the formation of amidinium-carboxylate salt bridges. A one-to-one donor-acceptor pair and a four-to-one antenna-type assembly are investigated. The steady-state and time-resolved fluorescence measurements unequivocally showed…
Recently developed methods to regulate the spatial and temporal patterning of genes in a light-directed manner hold promise as powerful tools for exploring the function of genes that act through their unique spatiotemporal patterning. To further explore the application of photocaged ligands of nuclear receptors to con…
We calculate the g-factor for electron, holes, and electron-hole pairs in CdTe quantum dots using the multiband $\mathbf{k}\mathit{\ensuremath{\cdot}}\mathbf{p}$ theory. The results show that g-factors are highly sensitive to the spatial confinement and its magnitude as well as sign may change when the geometric shape…
The theoretical model proposed earlier, which assumes that protein molecules in the surface layer can exist in multiple conformations with different molar area, so far has been applied to the equilibrium isotherms of surface pressure, adsorption, and adsorption layer thickness. Here we use the model for the surface di…
The Raman scattering due to confined acoustic vibrations in metal particles is studied theoretically. Various coupling mechanisms between the surface plasmon--polaritons and the confined vibrations are investigated. Their relative contribution to the light scattering is discussed. We found that two mechanisms play an…
Abstract Chemical scale inhibitors are commonly used to prevent or inhibit scale formation in production. The most economic treatment of scale inhibitor is normally via chemical squeeze. However, there is little agreement regarding the primary mechanism by which the threshold scale inhibitors are retained in producing…
The effects of H on the cross-slip process of a dissociated screw dislocation in nickel are studied by atomistic simulations using a configuration-space-path technique. We find that H binding in the stacking fault exerts no effect on the activation energy of cross-slip. H that is bound to the cores of the partial disl…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSelf-Assembled Stable Silver Nanoclusters and Nanonecklace Formation: Poly(methylhydrosiloxane)-Mediated One-Pot Route to Organosols†Bhanu P. S. Chauhan and Rajesh SardarView Author Information Polymers and Engineered Nanomaterials…
The crystal structure of natural rubber has been studied by many researchers including Bunn and Nyburg. However, the accepted crystal structure has not been reported. In the present study, the X-ray crystal structure analysis was carried out by using an imaging plate at −50 °C. Four molecular chains with STS̄cisS̄TSci…
New adsorbents were prepared and tested for the separation of propane-propylene mixtures by adsorption. The ordered mesoporous material SBA-15 was used as the starting material for silver-ion deposition for pi-complexation with propylene. Two different loadings of silver were evaluated. Adsorption equilibrium and kine…
Particle mobility, aggregate structure, and the mechanism of aggregate growth at the two-dimensional level have been of long-standing interest. Here, we use solid-stabilized emulsions as a model system to investigate the mobility of charged microparticles at poly(dimethylsiloxane) (oil)-water interfaces using confocal…
Porous metal-oxide filaments were readily fabricated using hydrophobic silk as template via the surface sol−gel process, followed by removal of the organic components. Such biotemplated porous matrixes were employed as nanoreactors for in situ synthesis of gold nanoparticles by NaBH 4 reduction of the incorporated gol…
The basal spacings of sodium montmorillonite (MMT) dispersed in various solvents and monomers were measured via X-ray diffraction. Some liquids with strong hydrogen-bonding groups (δ h ) showed little suspended MMT, but liquids with moderate or poor hydrogen-bonding groups precipitated MMT completely, this indicates t…