Materials Literature
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We study the dynamics of the glass formers toluene and glycerol below the glass transition temperature T g by means of 2 H NMR techniques. Whereas for toluene a slow β-process is observed in dielectric spectroscopy, this process is not discernible in glycerol. We demonstrate that standard 1D and 2D NMR experiments can…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTLight-Scattering Study of a Zwitterionic Polycarboxybetaine in Aqueous SolutionAizhen Niu, Der-Jang Liaw, Hui-Chuan Sang, and Chi WuView Author Information Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong; Department of Chemical Engineering…
The chemisorption properties of NO on the oxidized TiO 2 (110) surface have been investigated using both experimental and theoretical methods. The results of temperature-programmed desorption measurements indicate that for NO exposures less than 1.1 × 10 14 molecules/cm 2 NO adsorbs weakly and desorbs at ∼127 K. The t…
An analysis of the cylindical brush of an isolated comb copolymer molecule consisting of a semiflexible backbone and flexible side chains is presented. Using the Alexander−de Gennes approximation, we calculate the free energy of both straight and bent cylindrical brush and the brush persistence length λ, and show that…
A range of sodium caseinate samples were characterized by a multiangle laser light scattering (MALLS) system or by the use of MALLS as an on-line detector with size-exclusion chromatography (SEC). Sodium caseinate solutions, analyzed using a MALLS system alone, gave weight-average molar mass (M(w)) values in the range…
A carotenoid (C) porphyrin (P) fullerene (C 60 ) molecular triad (C−P−C 60 ) has been synthesized and found to undergo photoinduced electron transfer from the porphyrin first excited singlet state or to the fullerene first excited singlet state to yield C−P •+ −C 60 •- . Electron transfer from the carotenoid then give…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDesign and Structural Analysis of the First Spherical Monodendron Self-Organizable in a Cubic LatticeVirgil Percec, Wook-Dong Cho, Martin Möller, Svetlana A. Prokhorova, Goran Ungar, and Duncan J. P. YeardleyView Author Information Roy & Diana Vagelos Laboratories Depa…
We examine thin films of two simple metals (aluminum and lithium) in the stabilized jellium model, a modification of the regular jellium model in which a constant potential is added inside the metal to stabilize the system for a given background density. We investigate quantum-size effects on the surface energy and th…
Two erbium doped germanate glass samples prepared by sol-gel process and melting and casting method, respectively, have been characterized. A fluorescence lifetime of 2.5 ms at the 4I13/2 level and a very broad bandwidth (FWHM: 53.7 nm) around 1.55 micrometers have been observed for the sol-gel sample. The fluorescenc…
For the first time, an observation of second-order nonlinear susceptibility in an As2S3 chalcogenide glass thin film is reported. Both thermal poling and optical poling were used to induce this nonlinearity. In both cases, the magnitude of the χ333 coefficient was estimated to be > 0.6 pm/V.
Algorithms and experimental techniques for extracting the complex dielectric function of thin films (monolayers and bilayers) of quantum dots are developed. The algorithms are based on a combination of the so-called Newton−Raphson method, used in conjunction with a Kramers−Kronig analysis, and are used to analyze norm…
Unsaturated biopolyesters, (PHA−DB), obtained from pure anchovy (hamci), hazelnut, soybean oily acids and the mixtures of octanoic acid (in weight ratios of 50/50 and 70/30) were chlorinated up to 54 wt % Cl content. The molecular weights (MW) of the chlorinated biopolyesters were between 1.3 × 10 4 and 3.0 × 10 4 and…
The series of mononuclear iron(II) complexes with the tridentate macrocycle Me3tacn have been prepared (Me3tacn = 1,4,7-trimethyl-1,4,7-triazacyclonane). A purple, spin-crossover complex [Fe(Me3tacn)(MeCN)3](CF3-SO3)2 (1-OTf) forms in acetonitrile but readily loses MeCN ligands to form a colorless high-spin complex Fe…
Two families of "push-pull" phthalocyanines 1-3 having an unusually strong dipole moment have been prepared. The syntheses of unsymmetrically substituted phthalocyanines 1a,b and 2 bearing one or two electron-withdrawing 4-nitrophenylethynyl moieties, respectively, and six alkoxy substituents were performed by combina…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and First Structural Characterization of Lanthanide(II) Aryls: Observation of a Schlenk Equilibrium in Europium(II) and Ytterbium(II) ChemistryGernot Heckmann and Mark NiemeyerView Author Information Institut für Anorganische Chemie Universität Stuttgart Pfaf…
The 19 F 19 F nuclear spin−spin coupling constants J FF for a set of eighteen compounds related structurally to 1,8-difluoronaphthalene were measured by 19 F NMR spectroscopy. The FF distances d FF in these compounds were determined by ab initio 3-21G* molecular orbital calculations. Consistent with the lone-pair over…
The interactions of iodide ions with cuprite (Cu 2 O) surfaces were studied by combining batch experiments and surface analyses. The evolution of iodide uptake with pH was investigated. The thermodynamical calculations and surface analyses (X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectros…
The tunnel magnetoresistance (TMR) of F/O/F magnetic junctions, (F's are ferromagnetic layers and O is an oxide spacer) in the presence of magnetic impurities within the barrier, is investigated. We assume that magnetic couplings exist both between the spin of impurity and the bulk magnetization of the neighboring mag…
A polycrystalline and single-crystal samples of near-stoichiometric Ni2MnGa alloys have been investigated. It was confirmed that martensite short crystallographic axis (c-axis) is the easy axis of magnetization. The reversible reorientation of the easy magnetization direction of martensite samples after 5% compression…
Using analogies from nature, we investigated the possibility that tyrosinase-catalyzed reactions of 3,4-dihydroxyphenethylamine (dopamine) could confer water-resistant adhesive properties to semidilute solutions of the polysaccharide chitosan. Rheological measurements showed that the tyrosinase-catalyzed, and subseque…