Materials Literature
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A photochromic nitrospiropyran moiety (Sp) has been covalently linked to a zinc (PZn) and to a free-base (P(H2)) porphyrin. In the resulting dyads (P(Zn)-Sp(c) and P(H2)-Sp(c)), the porphyrin first excited singlet states are unperturbed by the closed form of the attached spiropyran. Excitation of the spiropyran moiety…
The influence of an electric field on a poorly conductive membrane such as a lipid bilayer is studied theoretically. The unbalanced electric stress created by an ionic current across a non-perfectly flat membrane gives rise to a destabilizing surface energy enhancing undulations. The deformation of a membrane attached…
Recent experiments have shown that C60 can be positively field-doped. In that state, fullerene exhibits a higher resistivity and a higher superconducting temperature than the corresponding negatively doped state. A strong intramolecular hole-phonon coupling, connected with the Jahn-Teller effect of the isolated positi…
The present study reports the investigation of polyoxometalate catalyzed electron transfer from the conduction band of photoexcited TiO2 to molecular oxygen. The oxidation of 1,2-dichlorobenzene (DCB) was used as an index reaction for evaluating the photocatalyst systems TiO2-PW12O40(3-), TiO2-SiW12O40,4- and TiO2-W10…
Modeling and flow reactor experiments were used to study the kinetics of NO x storage/release on a Pt/BaO/Al 2 O 3 model catalyst. The mechanism for this concept can be divided into four steps: (i) NO to NO 2 oxidation on Pt, (ii) NO 2 storage on BaO, (iii) NO x release, and (iv) NO x reduction to N 2 . In this paper,…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTmeso-Aryl-Substituted Expanded PorphyrinsJi-Young Shin, Hiroyuki Furuta, Kenji Yoza, Shinetsu Igarashi, and Atsuhiro OsukaView Author Information Department of Chemistry, Graduate School of Science Kyoto University, Kyoto 606-8502, Japan Bruker Japan, Tsukuba, Ibaraki…
The interactions between mesophase-forming copolymers and nanoscopic particles can lead to highly organized hybrid materials. The morphology of such composites depends not only on the characteristics of the copolymers, but also on the features of the nanoparticles. To explore this vast parameter space and predict the…
Investigation of the magnetic and transport properties of single-walled small-diameter carbon nanotubes embedded in a zeolite matrix revealed that at temperatures below 20 kelvin, 4 angstrom tubes exhibit superconducting behavior manifest as an anisotropic Meissner effect, with a superconducting gap and fluctuation su…
Mesophase induction was observed in binary mixtures of the liquid-crystalline lanthanum(III) dodecanoate and a nonmesomorphic lanthanide(III) dodecanoate. The compounds have the stoichiometry La x Ln 1 - x (C 11 H 23 COO) 3 (where x is the mole fraction of lanthanum, Ln = Nd, Eu, Ho, Tb, and Yb) and were characterized…
Abstract Free‐standing polyimide films are manufactured by the chemical imidization of linear, soluble polymeric precursors. The reactive solution is coated onto a heated substrate, peeled off after partial imidization, and then dried and cured as a free‐standing film. Adhesive bonds to the cast side of the final film…
Bicontinuous morphologies are ubiquitous in nature and occur at various length scales. Topological features of two such morphologies arising in an ordered block copolymer at equilibrium and a polymer blend during spinodal decomposition are measured from three-dimensional images. Interfacial curvature, coordination num…
Abstract Liquid‐crystalline epoxy resins were synthesized from 6‐hydroxy‐2‐naphthoic acid, which was used as a mesogenic component, with phenylhydroquinone or isosorbide and via a further reaction with (6‐bromo‐1‐hexyl)glycidylether, which was used as a flexible spacer. In this way, phenylhydroquinone‐bis‐6‐[6‐(glycid…
The sol−gel transition (SGT), upon which the infinite cluster (IC) of thermoreversibly bonded particles (gel fraction) appears against a background of a set of finite clusters (sol fraction), is quantitatively considered with due regard for large and complicated (mesoscopic) cycles inevitably present in the IC. To thi…
ADVERTISEMENT RETURN TO ISSUEPREVNotePreparation of Gold Nanoparticles from a Polyelectrolyte Complex Solution of Terthiophene AmphiphilesJi Ho Youk, Jason Locklin, Chuanjun Xia, Mi-Kyoung Park, and Rigoberto AdvinculaView Author Information Department of Chemistry, University of Alabama at Birmingham, Birmingham, Ala…
The π-radical cation as well as the dication species of a series of quinonoid π - extended TTF have been generated by means of time-resolved and steady-state radiation chemical techniques. The spectral characteristics of the π-radical cation revealed fingerprint absorptions, which are predominantly in the red region o…
Exciton characteristics of GaTe single crystals grown by vapor-phase transport were studied by optical measurements. A hydrogenlike exciton series up to $n=4$ was clearly observed in the absorption spectra at 2 K. In the $n=1$ exciton energy region three types of exciton lines were found. By analyzing microphotolumine…
The control of biodegradation and the improvement of moldability of poly- l -lactide, PLA, have been difficult because of the high crystallinity and the lability of melt viscosity. The synthesis of biodegradable PLA having the branched structure, comb-type PLA, was carried out by using only metabolizable materials to…
The mechanism of the B3/B1 phase transition of SiC has been investigated by periodic LCAO-DFT least-enthalpy calculations. A new transformation pathway, based on a Pmm2 orthorhombic intermediate state with two SiC units per cell, is found to be energetically favored over the traditional R3m mechanism. The computed act…
Time-resolved X-ray diffraction is utilized to follow phase transitions in nanostructured silica/surfactant composites in real time under hydrothermal conditions. The data allow us both to obtain kinetic parameters and to observe intermediate phases. In all cases, changes in the packing of the organic component of the…
Solid-state electrochemical cells based on oxygen-ion conduction (pure ionic or mixed ionic/electronic conductors) allow selective transport of oxygen (oxygen-ion conducting materials) in the form of ionic flux at high temperatures. Thus these systems can act as filters for molecular oxygen and can be used for both ge…