Materials Literature
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Crystals of Ba(2)FeO(4) and Ba(3)FeO(5), grown from a "self-sealing" KOH-Ba(OH)(2) flux, have been characterized by single-crystal X-ray diffraction, Mössbauer spectroscopy, and magnetic measurements. Ba(2)FeO(4) forms nonmerohedral twinned crystals with the monoclinic space group P2(1)/n, a = 6.034(2) A, b = 7.647(2)…
An experimental study of the viscosity of a macroscopic suspension, i.e., a suspension for which Brownian motion can be neglected, under steady shear is presented. The suspension is prepared with a high packing fraction and is density matched in a Newtonian carrier fluid. The viscosity of the suspension depends on the…
A temperature-entropy formulation is derived for thermoelectric devices. Thermoelectric chiller and generator cycles can then be cast in the same irreversible thermodynamics framework commonly applied to conventional large-scale cooling and power generation equipment, including a transparent identification of the prin…
Lamellae forming CEC triblock and CECEC pentablock copolymers located near the order−disorder transition temperature were subjected to reciprocating shear as a function of strain amplitude and thermal history. Both variables strongly influence the mix of perpendicular vs parallel lamellae alignment in the triblock cop…
A approximately 35 kDa protein that has been described to be secreted by Paucimonas lemoignei during growth on succinate and to inhibit hydrolysis of denatured (crystalline) poly(3-hydroxybutyrate) (dPHB) by extracellular PHB depolymerases of P. lemoignei (PHB depolymerase inhibitor (PDI)) was purified and characteriz…
This work deals with the common atomic force microscopy observation that small particles weakly adhering to a substrate tend to form aggregates at least when imaged under air. We show that it is possible to measure the coverage of mica surfaces with α-Al 2 O 3 colloids in situ by means of static light scattering. The…
A ${\mathrm{Si}}_{29}{\mathrm{H}}_{24}$ particle, with five atoms constituting a tetrahedral core and 24 atoms constituting a H-terminated reconstructed Si surface was recently proposed as a structural prototype of ultrasmall ultrabright particles prepared by electrochemical dispersion from bulk Si. We replace the H t…
The adsorption or covalent attachment of biological macromolecules onto polymer materials to improve their biocompatibility has been pursued using a variety of approaches, but key to understanding their efficacy is the verification of the structure and dynamics of the immobilized biomolecules. Here we present data on…
We have investigated the infrared optical absorption \ensuremath{\alpha}(\ensuremath{\omega}) of ferromagnetic p-type ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}.$ The observed \ensuremath{\alpha}(\ensuremath{\omega}) showed very non-Drude characteristics, indicating that the holes are nearly localiz…
The effects of Si/Al ratio of Al-containing MCM-41 materials prepared by either aluminum incorporation or postsynthesis alumination on the formation or prevention of structural defects and improvement of hydrothermal stability of MCM-41 have been investigated in detail. The states of Al and Si in the Al-containing mat…
In honor of Professor Bill Schowalter, we present a study which builds on his pioneering work on emulsion flows of deformable drops. Each drop is approximated as an ellipsoid, with its orientation and the lengths of its axes varying because of its time history in an imposed flow. The ordinary differential equations go…
A mathematical model has been developed to simulate the phenomenon of heat transfer occurring during a novel magnesium reduction process - the vertical retort technology. The model was based on the control-volume finite difference approach. The simulations were run to determine the effect of various parameters, such a…
An ion-ion reaction route under solvothermal condition at relatively low temperatures was first put forward to the preparation of tetragonal Cu(3)SnS(4) nanorods, on the basis of the strategy that 2D framework structure of Cu(3)SnS(4) containing layers could provide orientation for the growth of quasi-1D nanomaterials…
The effect of the ionic strength on adsorption of Cu on calcium montmorillonite was studied at concentrations ranging from 31 to 516 microM. An adsorption model was employed in the analysis of the data. When the background electrolyte was NaClO4, the ionic exchange was suppressed at 0.5 M concentration, and Cu adsorpt…
Semiconductor nanopaparticles of CdS and ZnS were synthesized by mixing two water-in-CO 2 microemulsions with one containing S 2- ions and the other containing Cd 2+ or Zn 2+ ions in the water core. Nanoparticle formation was monitored in situ by measuring their absorption spectra in the UV−vis range using a high-pres…
Pb-doping effect on physical properties of misfit-layered (Bi,Pb)-Sr-Co-O system, in which Co ions form a two-dimensional triangular lattice, was investigated in detail by electronic transport, magnetization and, specific-heat measurements. Pb doping enhances the metallic behavior, suggesting that carriers are doped.…
The speed at which selected reactants are reaching active sites grafted on porous silica gels of various nature and porosity was evaluated using some model systems: protonation of aminopropyl-grafted silica (APS), mercury(II) binding on mercaptopropyl-grafted silica (MPS), and accumulation of copper(II) on APS. Data w…
We study the effects of gating and contact geometry on current through self-assembled monolayers of conjugated molecules strongly coupled to gold electrodes by sulfur ``anchor groups''. The current changes by more than an order of magnitude depending on the angle between the axis of the benzene-dithiolate molecules an…
We have studied the effect of local Coulomb interactions on the electronic structure of the molecular magnet ${\mathrm{Mn}}_{12}$ acetate within the $\mathrm{LDA}+U$ approach. The account of the onsite repulsion results in a finite energy gap that is in a good agreement with the experimental results. The resulting mag…
We study the de Haas--van Alphen (dHvA) oscillation in two-dimensional and quasi-two-dimensional systems. We give a general formula of the dHvA oscillation in two-dimensional multiband systems. By using this formula, the dHvA oscillation and its temperature dependence for the two-band system are shown. By introducing…