Materials Literature
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Thin ZnO films, both native and doped with secondary metal ions, have been prepared by sputter deposition and also by casting from solutions containing a range of precursor salts. The conductivity and infrared reflectivity of these films are subsequently enhanced chemically following treatment in H2 gas at 400 °C or b…
Dynamic magnetic properties of the colossal magnetoresistance ferromagnet ${\mathrm{Nd}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ have been explored by ac-susceptibilities and dc-magnetization measurements. The system orders magnetically below ${T}_{c}\ensuremath{\approx}235$ K with a large difference between zero-…
The effects of the acidity of the carbon surface on the reactivity and selectivity of carbon supported noble metal catalysts in the reductive amination of benzaldehyde with ammonia was studied. The equilibria involved in the homogeneous solution were studied with 1H NMR. At the start of the reductive amination, dibenz…
Abstract The rheology and morphology of four sets of binary blends of polyethylene synthesized with metallocene catalysis (metallocene polyethylene: MCPE) with polyolefins prepared using Ziegler‐Natta catalysts have been investigated. The blend systems are MCPE with high density polyethylene (MCPE‐HDPE), polypropylene…
Biomolecular force fields for use in molecular dynamics (MD) simulations of proteins, DNA, or membranes are generally parametrized against ab initio quantum-chemical and experimental data for small molecules. The application of a force field in a simulation of a biomolecular system, such as a protein in solution, may…
Cadmium sulfide nanoparticle/polymer composites have been produced using a one-system reverse micellar synthesis. A monomer, methyl methacrylate (MMA), was used as the oil and polymerized following formation of 2−3 nm CdS particles in the fluid medium. When Aerosol OT (AOT) was employed as the surfactant, opaque solid…
Synchrotron radiation B K-edge XANES spectra are reported for 19 borate and borosilicate minerals. The spectra are characterized by three prominent features; a sharp peak (A) at ~194 eV (the edge feature of trigonal B; III B), a broader peak (B) at 197-199 eV (the edge feature of tetrahedral B, IV B), and a broad peak…
The origin of electrical property distribution on the substrate surface of Al-doped ZnO (AZO) films prepared by magnetron sputtering is reported. When the films were prepared on substrates at the same temperature with the same deposition rate under optimized sputter deposition and target preparation conditions, the mi…
Molecular-dynamics simulations of molten and gaseous NaCl are used to probe the entire range of screening behaviors including weakly and strongly-coupled regimes as well as the transition between them. Our simulations confirm that, in accordance with the Debye–Hückel theory, in the weakly-coupled regime (corresponding…
The paper presents the analysis of iron loss in interior permanent magnet synchronous motor over a wide-speed range of constant output power operation. The analysis is based on finite element method and uses the information on local flux density variation in the motor components. The total iron loss is calculated by s…
We present a new model for the physics of thresholdless switching in chiral smectics. In the limit of high polarization, the electro-optics of chiral smectic C liquid crystals are dominated by two distinct electrostatic effects. Complete (surface to surface) 'stiffening' of the polarization field by its charge self-in…
An advanced deposition technique known as glancing angle deposition (GLAD) [K. Robbie, J. C. Sit, and M. J. Brett, J. Vac. Sci. Technol. B 16, 1115 (1998); K. Robbie and M. J. Brett, U.S. Patent No. 5,866,204 (filed 1999)] has been used to fabricate periodic arrays of magnetic pillars and randomly seeded magnetic heli…
A technique for fabricating nonspherical colloidal particles using photolithography has been developed. The particles are plate shaped and their profile within the plane of the plate is defined by a lithography mask and so can be any form desired. The thickness of the particles can also be controlled by varying the am…
The influence of the concentration of poloxamer 407, the pH and the temperature on the gelation of silk fibroin (SF) were studied. It was found that the gelation of SF occurred in the presence of poloxamer at pH value of 7.0 while gelation of SF itself did not occur. The gelation time of SF was shortened with increasi…
Semifluorinated alkanes, R F R H , have a perfluorocarbon and a hydrocarbon segment in the molecule. R F R H are physically, chemically and physiologically inert, colorless, laser stable liquids with substantially reduced densities - between 1.1 and 1.7 g/cm 3 - and very low surface and interface tensions. R F R H are…
We demonstrate control of gelation kinetics in formation of poly(ethylene glycol) (PEG) hydrogels by enzymatic cross-linking. A predictive model for gelation kinetics based on macromer structure and composition, stoichiometric ratios of reactants, cross-linking enzyme concentration, and the underlying kinetics of enzy…
The dynamical behavior of Cl - and H 2 O molecules in the interlayer and on the (001) surface of the Ca-aluminate hydrate hydrocalumite (Friedel’s salt) over a range of temperatures from -100 to 300 °C was studied using isothermal-isobaric molecular dynamics computer simulations. This phase is currently the best avail…
In this study, potentiodynamic polarization scans, potentiostatic scratch tests, and modified American Society for Testing and Materials F746 tests were carried out in simulated body fluids on commercial orthodontic wires made of different classes of materials and on titanium used as a reference. The stability of pass…
Mechanism of initiation and propagation in polymerization of ϵ-caprolactone and L,L-dilactide induced with tin(II) octoate (Sn(Oct)2) and Sn(Oct)2/n-butyl alcohol system is presented. Tin(II) alkoxide bond formation is required in reaction of Sn(Oct)2 with hydroxyl group containing compound to form a true initiator. T…
The competition between viscous spreading of a liquid on a substrate and its absorption by a dry porous substrate is studied in two dimensions. The effect of capillary suction into the pores vies with contact-line slip on the substrate to determine the lifetime of the drop.