Materials Literature
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We report on the "molecular wiring" efficiency of glucose oxidase in organized self-assembled nanostructures comprised of enzyme layers alternating with layers of an osmium-derivatized poly(allylamine) cationic polyelectrolyte, acting as redox relays. Varying the relative position of the active enzyme layer in nanostr…
We describe our efforts toward the preparation of materials built with molecules possessing topologies analogous to those of macroscopic compasses and gyroscopes. Samples of 1,4-bis(3,3,3-triphenylpropynyl)benzene (3) were prepared by a simple two-step procedure from triphenylmethyl chloride (1) and 1,4-diiodobenzene.…
We prepared MgB$_{2-x}$Be$_{x}$ ($x=0$, 0.2, 0.3, 0.4, and 0.6) samples where B is substituted with Be. MgB$_{2}$ structure is maintained up to $x=0.6$. In-plane and inter-plane lattice constants were found to decrease and increase, respectively. Superconducting transition temperature $T_{c}$ decreases with $x$. We fo…
In a previous paper a method was developed to subtract the interactions due to periodically replicated charges (or other long-range entities) in one spatial dimension. The method constitutes a generalized "electrostatic layer correction" (ELC) which adapts any standard 3D summation method to slab-like conditions. Here…
The title complex, [CaZn2(C7H5O2)6(C10H14N2O)2], has a centrosymmetric molecule containing a linear array of two zinc and one central calcium ions bridged by two sets of three unsymmetrical benzoate ligands. Zinc is additionally coordinated by a nitrogen-base ligand to give distorted tetrahedral geometry, while the…
An efficient method for the preparation of 1,2,5-trisubstituted 4-imidazolidinones is presented. The synthetic approach is based on the formation of an N-[1-(benzotriazol-1-yl)alkyl] moiety on the amino group of a MBHA resin-bound amino acid. The nucleophilic substitution of the benzotriazole group with an amidic nitr…
In this work, an improved solution for multilayer adsorption of linear species is presented. The particular case of multilayer dimer adsorption is dealt with in detail, and a new adsorption isotherm is obtained for determination of surface area and adsorption energy from experiments. From the comparison between the ne…
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…