Materials Literature
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Abstract Interwell partitioning tracer test has been recognized as a reliable method for determining residual oil saturation Sorw between wells. While sophisticated streamline or finite difference simulators have been increasingly used to determine Sorw distribution from the tracer data, simple analytical methods such…
Imaging methods, such as micro-focus X-ray (MFX) imaging and magnetic resonance imaging (MRI), have greatly improved our ability to characterise the highly complex internal structures of porous media. MFX imaging and MRI are now both able to provide maps of the spatial distribution of local average accessible porosity…
The structural changes occurring in a 5.2 mol % 1-octene homogeneous ethylene-1-octene copolymer sample during a cooling and heating cycle at 10 °C/min are described in detail using DSC, AFM, SALLS, and synchrotron WAXD and SAXS. The DSC cooling curve exhibits two exothermic maxima where the high-temperature maximum m…
Abstract A UV‐curable polyurethane (PU)‐coating system containing phosphorus is formulated by the combination of photoinitiator, PU acrylate oligomer, and UV‐reactive phosphazene monomer. PU acrylate oligomer is prepared by the addition of 2‐hydroxyethylmethacrylate (HEMA) to NCO‐terminated PU prepolymer. UV‐reactive…
This paper reports the results of applying a computational method called the quantized elastic deformational model, to the determination of conformational flexibility of the supermolecular complex of human fatty acid synthase. The essence of this method is the ability to model large-scale conformational changes such a…
We have performed density functional calculations of the vibrational modes of three tin-based, cagelike clathrate materials: the pure type-I $({\mathrm{Sn}}_{46})$ and type-II $({\mathrm{Sn}}_{136})$ frameworks, and the donor/acceptor compensated compound ${\mathrm{Cs}}_{8}{\mathrm{Ga}}_{8}{\mathrm{Sn}}_{38}.$ We have…
Two low-dimensional compounds, KSnAsS(5) and K(2)SnAs(2)S(6), were prepared using liquid polythioarsenate salts, and the results differ from those obtained with the well studied thiophosphate flux. KSnAsS(5) crystallizes in the orthorhombic space group Pbam with cell parameters of a = 8.136(2) A, b = 13.784(4) A, c =…
The design, the synthesis and the mesomorphic properties of a new disc-like mesogen based on a hexasubstituted triphenylene core terminated with pentamethyldisiloxane pendant groups are reported. The siloxane fragments were grafted to the six terminal olefinic branches of a triphenylene precursor by a Pt-catalysed hyd…
A series of Cu1−xCoxFe2O4 (x = 0, 0.25, 0.5, 0.75, 1.0) ferrospinels has been studied in the gas phase alkylation of phenol. The reaction conditions were optimized to give a maximum yield of 2,6-xylenol over o-cresol. Fresh and spent catalysts were characterized by XRD, Mössbauer spectroscopy, TPR and TPD, TG and DTA…
The emerging field of materials-based actuation continues to be the focus of considerable research because of its inherent scalability and its promise to drive micromechanical devices that cannot be realized with conventional mechanical actuator strategies. The electrolytic phase transformation actuator offers a new b…
Abstract Kudzu fiber‐reinforced polypropylene composites were prepared, and their mechanical and thermal properties were determined. To enhance the adhesion between the kudzu fiber and the polypropylene matrix, maleic anhydride‐grafted polypropylene (MAPP) was used as a compatibilizer. A continuous improvement in both…
The crystal structure of a conserved hypothetical protein, Aq1575, from Aquifex aeolicus has been determined by using x-ray crystallography. The protein belongs to the domain of unknown function DUF28 in the Pfam and PALI databases for which there was no structural information available until now. A structural homolog…
The heat capacity and entropy of liquids in the GeSe2–Se system are reported. The thermodynamics of the system is evaluated and discussed in light of earlier reported viscosities and recent structural studies of liquid GeSe2. The thermodynamics of liquid GeSe2 suggest that extensive structural disordering takes place…
High-resolution powder diffraction was used to study the thermal transformation of silver carbonate. A sample of Ag(2)CO(3) was heated in a capillary under 4.5 atm CO(2) pressure. The decomposition temperature of silver carbonate to silver oxide is thereby increased, allowing high-resolution synchrotron X-ray powder d…
HeteroPolyAcids (HPA's) are a class of solid acids that have broad applications in many fields of science and technology, including catalysis and chemical engineering. The proton locations within the thermally stable and commonly known Keggin unit, which is the primary structure building unit/block, has remained undet…
Polymers based on meta substituted phenylene ethylene are prepared with patterned polar and nonpolar groups to favor an extended conformation. These polymers were characterized at the air-water interface by Langmuir techniques and found to form stable monolayers with an extended conformation based on molecular models.…
The conductance through a local nuclear spin precessing in a magnetic field is studied by using the equations-of-motion approach. The characteristics of the conductance is determined by the tunneling matrix and the position of equilibrium chemical potential. We find that the spin flip coupling between the electrons on…
We present experimental results on the displacement of a domain wall by injection of a dc current through the wall. The samples are 1 micron wide long stripes of a CoO/Co/Cu/NiFe classical spin valve structure. The stripes have been patterned by electron beam lithography. A neck has been defined at 1/3 of the total le…
The rheology of granular particles in an inclined plane geometry is studied using molecular dynamics simulations. The flow--no-flow boundary is determined for piles of varying heights over a range of inclination angles $θ$. Three angles determine the phase diagram: $θ_{r}$, the angle of repose, is the angle at which a…
The effect of uniaxial pressure (P_u) on the magnetic susceptibility (X), magnetization (M), and magnetoresistance (MR) of the heavy-fermion metamagnet CeRu2Si2 has been investigated. For the magnetic field along the tetragonal c axis, it is found that characteristic physical quantities, i.e., the temperature of the s…