Materials Literature
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Calorimetric, thermomechanical, and rheological properties of undercooled liquid Pd40Ni40P20 were determined within a wide temperature range above the glass transition. The concept of the limiting fictive temperature was applied to the entire set of measurements to compare the different properties adequately. It was f…
We present a new approach, namely ball milling, to synthesize amorphous boron nitride ( a ‐BN). The amorphization kinetics are revealed by X‐ray diffractometry (XRD), high‐resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS). HRTEM investigations indicate that, in the early…
Paracyclophane derivatives have been prepared that may be considered models of bichromophoric contacts in the solid. The optical properties of these compounds give insight into how bringing two chromophores into close proximity affects the photophysics of the pair. Thus, reaction of 4,7,12,15-tetrabromo[2.2]paracyclop…
The combination of a GaN laser diode and a 0.85 numerical aperture objective has achieved an optical storage capacity of over 22 GB. Owing to sufficient modulation ability and low-noise characteristics, GaN semiconductor lasers possess adequate quality to be light sources in optical recording systems. A bit size of 13…
A simple model for the interfacial free energy of a semicoherent interface is used to develop expressions for interface stresses, which are surface thermodynamic quantities associated with solid–solid interfaces. An analysis of the thermodynamics of thin film epitaxy is presented that incorporates the effects of free…
This paper investigates the performance characteristics of three domestic refrigerators, namely the vapour compression (VC), the thermoelectric (TE) and the absorption refrigeration (AR). AR and TE refrigerators are the result of research and development in refrigeration system in the quest to find a cooling system wh…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCobalt on Mesoporous Silica: The First Heterogeneous Pauson−Khand CatalystSang-Wook Kim, Seung Uk Son, Sang Ick Lee, Taeghwan Hyeon, and Young Keun ChungView Author Information Department of Chemistry and Center for Molecular Catalysis and School of Chemical Engineerin…
Polypyrrole (PPy) may be set to revolutionize biological applications such as tissue engineering and biosensors due to its high electroactivity/conductivity and the water compatibility of its films. However, inherent weaknesses in PPy-based materials arise from defect sites along the PPy polymer backbone, and its inst…
A new class of binary mesoporous yttria–zirconia(YZ) and ternary mesoporous metal-YZ materials (M=electroactive Ni/Pt) is presented here (the Figure shows PtYZ) that displays the highest surface area of any known form of yttria-stabilized zirconia. These mesoporous materials form as solid solutions and retain their st…
The transport and dielectric properties of ${\mathrm{Sr}}_{0.97}({\mathrm{Ti}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}){\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ solid solutions have been investigated at temperatures $1.5\mathrm{K}<~T<~300\mathrm{K}$ and frequencies $20\mathrm{Hz}<~\ensuremath{\nu}<~1\…
The crystal structure of silicalite (SiO2) with a substantial amount of structural hydroxyl groups [Si(1-x)O(2-4x)(OH)4x, with 0.08<x<0.10] has been refined from neutron powder diffraction data measured using the HRPD instrument at the ISIS pulsed neutron source. Powder data were collected on the as-synthesized orthor…
We investigate the phase behavior of colloidal hard-rod fluids near a single wall and confined in a slit pore. Zwanzig's hard-rod model is analyzed by minimization of a free energy functional, and a system of freely rotating spherocylinders is studied by Monte Carlo simulations. Both theory and simulation show i) a wa…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(3,4-ethylenedioxypyrrole): Organic Electrochemistry of a Highly Stable Electrochromic PolymerCarleton L. Gaupp, Kyukwan Zong, Philippe Schottland, Barry C. Thompson, Christopher A. Thomas, and John R. ReynoldsView Author Inform…
Lower oxidation potentials than for the monomeric starting materials are displayed by the diporphyrins obtained by one-electron oxidation with tris(4-bromophenyl)ammonium hexachloroantimonate [see, for example, Eq. (1)]. This and the strong red shift observed for the Soret bands of the product are indicative of extens…
We obtain the many-body hydrodynamic friction and mobility matrices describing the motion in a fluid of N hard-spheres with stick boundary conditions in the presence of a planar hard wall or free surface using (1) a multipole expansion of the hydrodynamic force densities induced on the spheres and (2) an image represe…
A new preparation is reported which, for the first time, results in a thin, crystalline SiO 2 film on a Mo(112) single crystal. The procedure consists of repeated cycles of silicon deposition and subsequent oxidation, followed by a final annealing procedure. AES and XPS have been used to control film stoichiometry. LE…
A poly(1,5‐diaminoanthraquinone) [poly(DAAQ)], which is a conducting polymer condensed with 1,4‐benzoquinone, was studied electrochemically and was proposed as a new category of electrochemical capacitor material. In common nonaqueous media, the poly(DAAQ) showed two sets of reproducible redox couples for repeated cyc…
Polyoxotungstates with propyl methacrylate functionalities and ethyl methacrylate were copolymerized in acetonitrile leading to the formation of networks whose swelling properties have been studied in several organic solvents. The polyanions ensure the cross-linking of poly(ethyl methacrylate) chains and are therefore…
Micro-Raman scattering from single-crystal diamond was performed over the temperature range 77--873 K. These measurements show that the Raman phonon frequency and the linewidth are temperature dependent, the linewidth and the frequency extrapolated to 0 K are $1.103\ifmmode\pm\else\textpm\fi{}0.03{\mathrm{cm}}^{\mathr…
We develop a computer simulation for the dynamic behavior of a phase-separating binary mixture that contains mobile, solid particles. The system models “filled polymers”, which contain not only a blend of different macromolecules, but also solid fillers. We focus on the case where one of the components preferentially…