Materials Literature
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Electron spin echoes were performed on nitrogen-vacancy $(\mathrm{N}\ensuremath{-}V)$ centers in diamond using optical polarization and detection and 35 GHz microwave control. The experiments demonstrate an approach to quantum information in the solid state. A phase memory time of $3.6 \ensuremath{\mu}\mathrm{s}$ was…
Raman spectra were obtained from thin bundles containing just a few single-wall carbon nanotubes (SWNTs). These spectra exhibit new characteristics absent in the ensemble Raman measurements. A large variation in the radial breathing mode (RBM) Stokes to anti-Stokes Raman intensity ratio was observed for different meta…
Emission bands from Er 3+ ions on C 2 and S 6 sites of cubic Y 2 O 3 have been observed under 632.8 nm excitation. The well-known green hot band in the region of 520−540 nm and a new blue-green hot band in the region of 469−474 nm have been observed from Er 3+ on both sites. These hot bands are assigned to the 2 H 11/…
Calorimetry, small-angle X-ray scattering, and viscometry were used to study the structure of NaOH-water and cellulose-NaOH-water solutions in the range of 0-20% NaOH and 0-5% cellulose concentrations in the low-temperature region of -60 to 0 degree C. Pure NaOH-water solutions show a pseudoeutectic behavior with thre…
This study addresses the fouling of heat exchangers by coprecipitating inorganic salts. It investigates the effects of nondominant CaCO 3 on thermodynamics and kinetics of CaSO 4 precipitation as well as on scale structure. Even though precipitating salts coexist in industrial water systems, because of the complexity…
Using monomer-resolved molecular dynamics simulations and theoretical arguments based on the radial dependence of the osmotic pressure in the interior of a star, we systematically investigate the effective interactions between hard, colloidal particles and star polymers in a good solvent. The relevant parameters are t…
Transparent thin films of layered inorganic−organic nanocomposites were prepared by the sol−gel reactions of alkyldimethylmethoxysilane, alkylmethyldimethoxysilane, and alkyltrimethoxysilane in the presence of tetramethoxysilane followed by spin-coating. The macroscopic homogeneity and the nanostructural ordering of t…
Results of dielectric and resonance frequency ${(f}_{r})$ measurements below room temperature are presented for $\mathrm{Pb}({\mathrm{Zr}}_{x}{\mathrm{Ti}}_{1\ensuremath{-}x}){\mathrm{O}}_{3},$ $x=0.515$ and 0.520. It is shown that the temperature coefficient of ${f}_{r}$ changes sign from negative to positive around…
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…