Materials Literature
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Studies of the dielectric properties and phase behavior of an ${}^{18}\mathrm{O}$-substituted ${\mathrm{SrTiO}}_{3}$ (>97% ${}^{18}\mathrm{O}),$ or STO-18, crystal at 1 bar and as functions of hydrostatic pressure and applied dc biasing electric field have shed much light on the mechanism of the ${}^{18}\mathrm{O}$…
A series of aliphatic copolyesters was obtained from (R,S)-beta-butyrolactone and two isomeric hydroxy acids, 6-hydroxyhexanoic and (R,S)-2-hydroxyhexanoic acids. The reactions were conducted in bulk without catalyst. Electrospray ionization tandem mass spectrometry (ESI-MSn) was used for molecular characterization of…
C n B and C n B 2 clusters, n = 4−10, were studied at the B3LYP/6-311G** level of theory. When n = 5, the linear and cyclic structures are comparable in energy. For n ≥ 6, the minimal-energy structures were found to be cyclic. Moreover, in contrast to all other reported heteroatom−carbon clusters, the lowest-energy li…
We investigate the photoluminescence (PL) evolution of porous silicon samples when exposed to air in darkness and under illumination. Oxygen incorporation is monitored through ir spectroscopy. Fourier transform infrared measurements show that samples exposed to air in darkness exhibit low oxidation rates whereas its P…
Abstract Large volumes of hydrate inhibitors (e.g., methanol, ethanol, monoethylene glycol, and triethylene glycol as cosolvent) are added to control hydrate formation. Such practice has an adverse effect on scale formation since the mineral salts are generally less soluble in the cosolvent. Due to production from res…
The conformational and morphological changes occurring at the air/water interface during the compression of pure poly( d -lactide) (PDLA), pure poly( l -lactide) (PLLA), and their equimolar blend have been thoroughly investigated using polarization−modulation infrared reflection−absorption spectroscopy and Brewster an…
Abstract The BP operated Miller field arguably produces the most severe barium sulphate scaling waters in the world. There is an operational need to carry out scale squeeze operations almost continually in order to maintain the oil and gas production. In this paper, we will present the challenges overcome proposing an…
Abstract The composition of the essential oils of stems and seeds of Pituranthos scoparius was determined by GC–MS. Almost 50 compounds were identified. In the seed oil, the main compounds were α ‐pinene (8.2%), β ‐pinene (4.6%), p ‐cymene (7.5%), limonene (11.2%), thymol (5.9%), myristicin (11.1%) and dill apiole (12.…
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…