Materials Literature
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This paper proposes a new volume function for calculation of the entropy of planar granular assemblies. This function is extracted from the antisymmetric part of a new geometric tensor and is rigorously additive when summed over grains. It leads to the identification of a conveniently small phase space. The utility of…
Dielectric relaxation spectroscopy (10−1 Hz to 106 Hz) is employed to study the molecular dynamics of poly(dimethylsiloxane) (PDMS, Mw=1.7×105 g mol−1 and Mw=9.6×104 g mol−1) as grafted films with thicknesses d below and above the radius of gyration Rg. For the thinnest films the molecular dynamics becomes faster by u…
Elegant three-dimensional MoS2 nanoflowers were uniformly formed via heating a MoO2 thin film in a vapor sulfur atmosphere. Tens to hundreds of petals were self-assembled within a single nanoflower. Each petal, 100–300 nm wide and only several nanometers thick, exhibited a hexagonal structure. The number of petal laye…
We propose that the indirect adatom-adatom interaction mediated by the conduction electrons of a metallic surface is responsible for the $\sqrt{3}\times \sqrt{3}\Leftrightarrow 3\times 3$ structural phase transitions observed in Sn/Ge (111) and Pb/Ge (111). When the indirect interaction overwhelms the local stress fie…
There are two competing views of itinerant ferromagnetism, the first viewing ferromagnetism as resulting from the indirect coupling between local moments via the itinerant carrier dynamics, the so-called RKKY mechanism, while in the alternative picture, ferromagnetism results from the spin polarization of itinerant ca…
The morphology of the microcrystalline zinc oxide formed by reaction of zinc salts with sodium hydroxide depends critically on the reaction conditions. To understand this, the nature of the solid product has been probed by scanning electron microcopy (SEM) and X-ray diffraction (XRD) and the concentration of zinc rema…
We have developed a simple, efficient process for solubilization of single-wall carbon nanotubes (SWNTs) with amylose in aqueous DMSO. This process requires two important conditions, presonication of SWNTs and subsequent amylose treatment in an optimum mixture of DMSO/H2O. The former step separates SWNT bundles, and t…
We report on the development of a dilute suspension of ferroelectric particles in a nematic liquid-crystal (LC) host. We found that the submicron particles do not disturb the LC alignment and the suspension macroscopically appears similar to a pure LC with no readily apparent evidence of dissolved particles. The suspe…
Methods have been used to generate air bubbles beneath a planar air−water interface, stabilized by partially hydrophobic quasi-spherical silica particles (primary diameter of 20 nm) in pure water. Particles tended to aggregate at the planar interface, and all the silica dispersions had low foamability. However, those…
We report systematic first-principles calculations for ordered zinc-blende compounds of the transition metal elements V, Cr, and Mn with the $\mathrm{sp}$ elements N, P, As, Sb, S, Se, and Te, motivated by a recent fabrication of zinc-blende CrAs, CrSb, and MnAs. They show a ferromagnetic half-metallic behavior for a…
Colloidal CdTe quantum dots prepared in TOP/DDA (trioctylphosphine/dodecylamine) are transferred into water by the use of amino−ethanethiol•HCl (AET) or mercaptopropionic acid (MPA). This results in an increase in the photoluminescence quantum efficiency and a longer exciton lifetime. For the first time, water-soluble…
Single crystals of (Ca2CoO3)0.7CoO2 were grown using a modified strontium chloride flux technique, and their electrical and thermal properties were determined. Growth conditions were established for obtaining plate-like single crystals of a relatively large size (5×10×0.05 mm3). At 973 K, thermoelectric power S and el…
The itinerant-electron metamagnetic (IEM) transition and magnetocaloric effects (MCE's) in the $\mathrm{La}({\mathrm{Fe}}_{x}{\mathrm{Si}}_{1\ensuremath{-}x}{)}_{13}$ and $\mathrm{La}({\mathrm{Fe}}_{x}{\mathrm{Si}}_{1\ensuremath{-}x}{)}_{13}{\mathrm{H}}_{y}$ compounds have been investigated. The $\mathrm{La}({\mathrm{…
The influence of titanium content and heat treatment temperature on the optical and mechanical properties of TiO2/γ-glycidoxypropyltrimethoxysilane and methyltrimethoxysilane hybrid films processed by the sol–gel technique are studied for photonic applications. Waveguide film with a thickness more than 1.60 μm is prep…
This paper, the first of two companion papers, reports empirical data on wear properties in carbon nitride coatings by a spherical diamond counter-face in repeated sliding contacts through in situ examination and post-sliding observation, with an emphasis on the effects of friction cycles and normal load. In the repea…
Tris(2-aminoethylamine) (tren)-capped porphyrins bearing electron donating or withdrawing groups on the amino functions of their tripod have been synthesised and the catalytic activity of each complex was carefully studied both as the iron and the iron-copper complexes: only one of our iron-copper complexes was shown…
The utility of different polycarboxybetaines (PCB) as positively charged components of polyelectrolyte complexes was elucidated by potentiometry, turbidimetry, and fluorescence spectroscopy. PCB practically did not quench the fluorescence of either pyrenyl-tagged poly(methacrylic acid) or ethidium bromide intercalated…
The glycopeptide Ac-(Gly-Pro-Thr(beta-Gal))(10)-NH(2) forms a collagen-like triple-helix. A (1)H NMR structural analysis is reported for the peptides Ac-(Gly-Pro-Thr)(n)-NH(2) and Ac-(Gly-Pro-Thr(beta-Gal))(n)-NH(2), where n = 1, 5, and 10. NMR assignments for the individual peptides are made using one- and two-dimens…
When soluble extracts of the extreme acidothermophilic archaeon Sulfolobus solfataricus were incubated with [gamma-(32)P]ATP, several proteins were radiolabeled. One of the more prominent of these, which migrated with a mass of approximately 46 kDa on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE…
Crystal structure and magnetic properties of Gd(2)([18]crown-6)(2)(OH)(2)(CH(3)CN)(2)[Ni(dmit)(2)](2) (dmit(2)(-) = 2-thioxo-1,3-dithiole-4,5-dithiolate) are reported. Gd(3+) ions (S = (7)/(2)) were introduced into the pi-spin network of [Ni(dmit)(2)](-) (S = (1)/(2)) complex as a binuclear supramolecular cation, Gd(2…