Materials Literature
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The Co and Fe sites have been probed in pristine and CO 2 -treated Sr 0.95 Ca 0.05 Fe 0.5 Co 0.5 O 3 - δ using emission (EMS) and transmission (TMS) Mössbauer spectroscopy and found to have different local oxygen coordination environments and, most probably, a layered arrangement in the lattice. The EMS and TMS spectr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTAnionic Polymerization of Macrocyclic α-(Alkoxymethyl)acrylates Leading to Novel Vinyl Polymer with Crown Ether Type Side ChainShigeki Habaue, Masatake Morita, and Yoshio OkamotoView Author Information Department of Applied Chemistr…
Polyanilines with liquid crystalline (LC) substituents, which consist of a flexible methylene spacer and phenylcyclohexyl moiety as a mesogenic core, were synthesized. Polymerizations were performed using ammonium persulfate and perchloric acid as the catalytic system. The polymers were quite soluble in organic solven…
The excitation, emission, electron paramagnetic resonance, and Raman scattering spectra of as-prepared and aged Si wires, like porous silicon, have been examined. Atomic force microscope is used for the surface morphology investigation, as well as the study of this morphology connection with photoluminescence (PL) pec…
Homogeneous DNA hybridization assay based on the luminescence resonance energy transfer (LRET) from a new luminescence terbium chelate, N,N,N(1),N(1)-[2,6-bis(3'-aminomethyl-1'-pyrazolyl)-4-phenylpyridine]tetrakis(acetic acid) (BPTA)-Tb(3+) (lambda(ex) = 325 nm and lambda(em) = 545 nm) to an organic dye, Cy3 (lambda(e…
Time-resolved transient grating experiments with various polarizations are used to separate different responses and measure their dynamics in supercooled liquid salol. A contribution to signal from orientational alignment induced by flow that arises from thermal expansion is demonstrated. This contribution is distinct…
High-density amorphous ice was heated at constant pressures of between 0.52 to 1.9 GPa from 77 K up to 240 K. The formed phases were characterized by x-ray diffractograms of samples recovered under liquid N2 at 1 bar. The (meta)stability domain of ice XII thus revealed extends between ≈158–212 K from ≈0.7 to ≈1.5 GPa.…
Lipophilic linear semirigid side arms containing two or three successive phenyl rings separated by carboxylate spacers have been connected to the 5 or 6 positions of bent aromatic terdentate 2,6-bis(benzimidazol-2-yl)pyridine binding units to give extended V-shaped ( L11 ) and I-shaped receptors ( L12, L12b, and L13 )…
Previous low-temperature heat capacity measurements down to 2 K have been analyzed as resulting from one-dimensional quantum confinement of single-wall carbon nanotube (SWNT) vibrational modes [J. Hone et al., Science 289, 1730 (2000)]. We extended the measurements on SWNT ropes from the same preparation technique dow…
Photochemical reduction of xanthone in an alcoholic solution flowing in a column packed with MCM-41, a mesoporous silica, was dependent on the magnetic field. The free radical intermediates were detected by the spin trapping method and the yield of spin adducts was also dependent on the magnetic field. In addition, a…
Charge-transfer complexes of a disk-shaped electron-rich donor, based on pentakis(phenylethynyl)phenol and a series of electron-deficient acceptors, based on 2,4,7-trinitro-9-fluorenone have been prepared. Specific interactions resulted in supramolecular assemblies that exhibited various mesophases, although none of t…
We analysed x-ray powder diffraction data of spray pyrolytic precursor powders for the oxide-powder-in-tube (OPIT) technology by means of the Rietveld method. For calcinations in air we find a typical phase composition of 2212, 14-24, 11, CP and 3321 at 800 °C (13 h). At 820 °C 2212 is in equilibrium with 14-24 and CP…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of a Polyanionic Water-Soluble Poly(ferrocenylsilane)Mark A. Hempenius and G. Julius VancsoView Author Information MESA+ Research Institute and Faculty of Chemical Technology, University of Twente, P.O. Box 217, NL-7500 AE…
The electronic structure of p-type semiconducting Sr 2 Cu 2 ZnO 2 S 2 (SCZOS) was examined experimentally and theoretically. The band gap of SCZOS estimated by the optical absorption of its thin film was 2.7 eV, which is relatively large in chalcogenide semiconductors. Normal and inverse photoemission spectra were mea…
By appropriate fitting of conductive-system frequency-response data for two different ionic materials over ranges of temperature and ionic concentration, it is shown how dispersion associated entirely with ionic motion and that leading to nearly constant dielectric loss (NCL) can be unambiguously distinguished and sep…
The first demonstration of thioester and thiocarbonate binding to gold is provided via steady-state fluorescence spectroscopy of probe molecule adsorption onto a nanoparticle surface. Both thioester 1 and thiocarbonate 2 bind noncovalently to gold from aqueous solution, with 2 possessing a greater affinity for the gol…
The photochromic couple dihydroazulene/vinylheptafulvene (DHA/VHF) is an established system for molecular switching. The photoinduced ring opening of the thermally stable dihydroazulene proceeds in the picosecond time regime with subsequent rapid relaxation to the electronic ground state. So far it was not possible to…
Grafting efficiency and graft conversion have been investigated for poly(ethylene glycol) methyl ether methacrylate (m-PEGMA) polymerized on the surface of diethyldithiocarbamate-containing polymer substrates. The substrate is prepared by copolymerization of a mixture of methacrylic monomers with a methacrylic diethyl…
Abstract Research on non‐toxic inhibitors is of considerable interest in investigations into the replacement of hazardous classical molecules. This paper reports the action of four amino acids containing sulfur on the corrosion of mild steel in phosphoric acid solution with and without Cl − , F − and Fe 3+ ions near a…
Individual polyphenylene dendrimer 1 and their self-assembled nanostructures, prepared by spin-coating and solvent casting on various substrates such as mica, silanized mica, and highly oriented pyrolytic graphite (HOPG), have been investigated by noncontact atomic force microscopy. Besides globular clusters and monol…