Materials Literature
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Primary nucleation of burkeite, which is a crystalline solid solution of sodium carbonate and sodium sulfate having the stoichiometry Na 2 CO 3 ·2Na 2 SO 4, was monitored using an on-line particle-size analyzer. Observations of unusual nucleation behavior led to explorations that identified specific impurities in the…
Abstract With thermally stimulated depolarization currents, we researched the relaxations of crosslinked polyethylene as it is used in medium‐voltage cable insulation. Through conventional polarization two heteropolar peaks stand up in the spectra, at 80 and 105 °C. As the sample is annealed, a homopolar peak is devel…
Exploring new channels: A range of alkali-metal copper silicates that contain double layers of silicate tetrahedra have been prepared, which contain straight 12-ring channels that are analogous to those found in LTL-type zeolites. The framework that defines the 12-ring channels is neutral and, consequently, only neutr…
A series of poly(ethylene oxide)/poly(butylene terephthalate) (PEO/PBT) segmented block copolymer films was treated with a radio-frequency carbon dioxide (CO(2)) or with argon (Ar) plasma. The effects of (preferential) etching on surface structure, topography, chemistry, and wettability were studied by scanning electr…
Electrochemical template synthesis of multilayer nanowires consisting of alternating ferromagnetic and nonmagnetic layers provides an approach to control the properties of magnetic particles in suspension. Copper/nickel multilayer nanowires were fabricated by electrochemical deposition from a solution containing both…
A single-electron inverter based on the Coulomb blockade effects has been fabricated in multiwalled carbon nanotubes, by using the Ar irradiation method for the tunnel barrier formation in the quantum dots. The device characteristics were measured at 2.6 K, and an indication of inverter-like transfer characteristics h…
We report on studies to determine the elementary diffusion jump of minority Sn atoms in the $\ensuremath{\gamma}$ phase of the intermetallic copper-tin alloy. The diffusionally accelerated decay from a crystalline ${\mathrm{Cu}}_{84}{\mathrm{Sn}}_{16}$ sample at elevated temperatures has been probed by quasielastic nu…
Field-cycling nuclear magnetic resonance relaxometry was used to study the spin-lattice relaxation dispersion of selected standard nematic liquid crystals at different temperatures, in presence and absence of a monochromatic ultrasonic field. It was found that sonication changes the relaxation dispersion and, in some…
The new block amphiphilic copolymer, poly(sodium styrenesulfonate- block -5-(4-acryloyloxyphenyl)-10,15,20-tritolylporphyrin) (PSSS- block -Po), was synthesized by nitroxide-mediated “living” radical polymerization. The polymer is soluble in water and can absorb light in the visible region. The absorbed energy migrate…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Poly(phenylene oxide) Containing Trifluoromethyl Groups via Selective and Sequential Nucleophilic Aromatic Substitution ReactionYun Jun Kim, Im Sik Chung, and Sang Youl KimView Author Information Center for Advanced Fun…
Abstract Graft copolymers of bacterial polyesters were prepared by direct condensation of poly(3‐hydroxyoctanoate‐ co ‐9‐carboxy‐3‐hydroxydecanoate) (PHOD) and poly(ethylene glycol) (PEG) or poly(lactic acid) (PLA). Nanoparticles from PHO, PHOD, PHOD‐ g ‐PEG, and PHOD‐ g ‐PLA were obtained by solvent displacement with…
We used field-theoretic simulations to study the equilibrium behavior of a polymer solution under good solvent conditions confined to a slit of width L. In particular, we obtained the chemical potential and the density profiles across the slit for different values of the monomer excluded volume over a wide range of co…
Using the inherent structure formalism originally proposed by Stillinger and Weber [Phys. Rev. A 25, 978 (1982)], we generalize the thermodynamics of an energy landscape that has an ideal glass transition and derive the consequences for its equation of state. In doing so, we identify a separation of configurational an…
Realistic molecular simulations agree with previously published surface force experiments that n-dodecane confined between mica surfaces displays shear-thinning starting at shear rate orders of magnitude less than in the bulk fluid. We probe the origin of this behavior by studying rotational and diffusional relaxation…
A series of easy to prepare organic salt based on imidazole derivatives and cyclobutane-1,1-dicarboxylic acid have been studied for their gelation behavior after it was found that imidazolium hydrogen cyclobutane-1,1-dicarboxylate ( 1 ) can harden few organic liquids. 1 forms remarkably stable gel (remains intact for…
Nanowassertropfen: Polyoxometallat-Container/Cluster können Schalen von Wassermolekülen enthalten. An den Oberflächen der Cluster befinden sich Poren, die im offenen Zustand Zutritt zum Clusterinneren gewähren (siehe Bild: Vier der zwanzig Poren sind erkennbar sowie eines der sechs eingeschlossenen Na+-Ionen in Violet…
The unique behavior of a new Ru(II) diimine complex, Ru(bpy)(2)(L)(2+) (where L is 4-methyl-4'-[p-(dimethyl- amino)-alpha-styryl]-2,2'-bipyridine, bpy is 2,2'-bipyridine), was studied in detail. Due to the strong electron donating property of the amino group, an ILCT (intraligand charge transfer) state is involved eit…
Crystal clear! The routine collection of near single-crystal-quality diffraction data from a powdered sample is possible by exploiting the anisotropic thermal expansion of a molecular solid to enhance the extraction of diffracted intensities from a heavily overlapped powder diffraction pattern. The method is validated…
Modeling exercises on the size-induced blue-shift in the photoluminescence (PL) of nanosolid Si ( J. Phys. Chem . B 2002, 106, 11725) have been extended herewith to the size dependence of the Si-2p energy-level-shift measured using X-ray photoelectron spectroscopy (XPS). Results show consistency in both the origin and…
Fischer−Tropsch (FT) synthesis with Co catalysts supported on mesoporous silica (SBA-15) with narrow pore size distribution has been carried out with a fixed bed stainless steel reactor at 503 K and 2.0 MPa. When 20 mass % Co is supported on SBA-15 with an average pore diameter of 8.6 nm by using an ethanol solution o…