Materials Literature
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Abstract Using oligoketones with different degrees of condensation ( n = 1, 10, 20), dichlorides of isophthalic and terephthalic acids and 2,2‐bis[4‐hydroxyphenyl]‐propane block ‐copolyetherether ketones (BCPEEKs) were synthesized by means of acceptor–catalytic polycondensation. Their properties were also investigated…
X-ray photoelectrons excited by x-ray standing waves (XSW) are used to study the atomic structure of the low-formation-temperature $(370\ifmmode^\circ\else\textdegree\fi{}\mathrm{C})$ interface between ${\mathrm{CaF}}_{2}$ and Si(111). The core-level shift of the photoemission spectra of the Ca atoms at the ${\mathrm{…
Abstract The vulcanization of natural rubber was studied with the sulfurating agents dipentamethylene thiuram tetrasulfide (DPTT) and tetramethylene thiuram disulfide (TMTD) in the presence of tetramethyl thiuram monosulfide (TMTM). This last accelerant affects the rate and efficiency of the vulcanization as well as t…
High-pressure infrared absorption spectroscopy is used to examine changes in local bonding upon hydrostatic compression in both ordered surfactant-templated mesoporous silica and sintered sol−gel silica with a goal of connecting atomic scale structural changes with variations in nanoscale periodicity. High-pressure IR…
A weakly charged polyelectrolyte brush in a polar−nonpolar solvent mixture is studied using a boxlike model and by numerical self-consistent-field theory. The work is a continuation of a similar study of a neutral polymer brush in a solvent mixture with a pronounced solubility gap. We study both the structure and stru…
Abstract The air penetration within a porous clothing system on a moving human being is an important physical process that considerably affects the heat and moisture resistance of the textile material. This effect of the coupled convection heat and mass exchange within the clothing system is experimentally investigate…
PrAlO 3 is shown to undergo a rhombohedral ( R 3̄c) to orthorhombic ( Imma ) phase transition upon application of pressures of up to 9.1 GPa. The structures in both phases have been refined from high-resolution synchrotron diffraction data. The structure initially evolves toward a higher-symmetry structure as the pres…
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…