Materials Literature
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The lineshapes of the Raman excitation profiles for radial breathing modes in carbon nanotubes are shown to be strongly affected by interference effects that arise whenever strong optical transitions are separated by a small energy. This is the case in metallic zigzag and chiral tubes, where one-dimensional singularit…
According to a recent report by Park et al., ${\mathrm{ZnCNi}}_{3}$ is isostructural and isovalent to the superconducting $({T}_{c}\ensuremath{\sim}8\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ antiperovskite, ${\mathrm{MgCNi}}_{3}$, but shows no indication of a superconducting transition down to $2\phantom{\rule{0.3em}{0e…
A possible universal definition for a nanostructured material based purely on experimental data available in literature for a wide variety of physical phenomena is proposed. It is suggested that for values of the ratio of sample volume, V to that of the unit cell volume, Vc, 10^5- 10^6 the samples behave as nanostruct…
Abstract Different morphologies of copper and copper oxide nanocrystallites, including radially arrayed whiskers, cubic particles and sphere particles, have been successfully synthesized by a microwave‐induced method under ambient conditions. In aqueous solution containing different ethylene glycol concentrations, cop…
Electricity was produced by catalytic oxidation of carbon monoxide (CO) by using gold catalysts at room temperature. The observed rates are faster than conventional processes operating at 500 kelvin or higher for the conversion of CO with water to produce hydrogen and carbon dioxide through the water-gas shift (WGS).…
This paper demonstrates the use of arrays of networks of single wall carbon nanotubes (SWNTs) and electrical breakdown procedures for building thin film transistors (TFTs) that have good, reproducible performance and high current output. Channel length scaling analysis of these TFTs indicates that the resistance at th…
We describe a simple process for the fabrication of ultrathin, transparent, optically homogeneous, electrically conducting films of pure single-walled carbon nanotubes and the transfer of those films to various substrates. For equivalent sheet resistance, the films exhibit optical transmittance comparable to that of c…
Bulk ZnO Schottky rectifiers with Pt rectifying contacts were exposed to 40 MeV protons at fluences from 5 × 109 to 5 × 1010 cm–2. These doses correspond to that received in more than 10 or 100 years, respectively, in low earth satellite orbit. The reverse breakdown voltage of the ZnO diodes increased from ∼3.2 V (tak…
Abstract In solution, the photochromic molecule 5‐methoxyspiro[indole‐phenanthrolinoxazine] ( SPO ) is in equilibrium with its corresponding merocyanine open isomer. In pure acetonitrile, there is about 22.5% of the open form, whereas in acetonitrile–water binary solvents this proportion increases to more than 60% whe…
The incorporation of trans cyclohexylene (C-ring) groups into the main chain glassy polymers has been found to increase chain motion. With the increase in trans C-ring content, Young's modulus and yield stress both decrease. A linear correlation among Young's modulus, yield stress, and the inverse of the coefficient o…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPHB Lamellar Single Crystals: Origin of the Splintered TextureRobert H. Marchessault and Jumpei KawadaView Author Information Department of Chemistry, McGill University, 3420 University Street, Montreal, Quebec H3A 2A7, Canada Cite this: Macromolecules 2004, 37, 19, 7418–7420Pu…
Goldbeschichtetes Gold. NAD(P)H-Cofaktoren vermitteln die katalytische Züchtung von Au-Nanopartikeln in Gegenwart von AuCl4− und CTAB (Cetyltrimethylammoniumbromid, siehe Schema). Dieser Prozess ermöglicht die optische Detektion der Cofaktoren und die Analyse NAD(P)+-abhängiger biokatalytischer Umwandlungen in Lösung…
Lithiumionen-Shuttle: Überraschend stabile und lösliche sphärische poröse Molybdänoxid-Nanocontainer („künstliche Zellen“, siehe Bild) wechselwirken spezifisch mit ihrer Umgebung. Beispielsweise lagern diese Zellen Kationen aus Lösungen in definierten inneren Positionen ein. Für das gezeigte Beispiel wurde NMR-spektro…
Two fluorinated poly(arylene ether)s, P1 and P2, containing perfluorophenyl moieties in the main chains and second-order nonlinear optical (NLO) chromophores in the side chains have been conveniently prepared by Knoevenagel condensation reaction between perfluorophenyl-containing poly(arylene ether) P and cyanoacetyla…
A novel series of fully reduced heteropolyoxovanadium(IV) compounds, [MVIV6O6[(OCH2CH2)2N(CH2CH2OH)]6]X (1, M = Li, X = Cl x LiCl; 2, M = Na, X = Cl x H2O; 3, M = Mg, X = 2Br x H2O; 4, M = Mn, X = 2Cl; 5, M = Fe, X = 2Cl; 6, M = Co, X = 2Cl x H2O; 7, M = Ni, X = 2Cl x H2O), have been synthesized and characterized by F…
Femtosecond visible pump-IR probe studies of Cp2W2(CO)6 in P(OMe)3 and CH2Cl2 have allowed direct observation of a 19-electron intermediate and of disproportionation into CpW(CO)3- and CpW(CO)3P(OMe)3+ on the ultrafast time scale. A new disproportionation mechanism involving in-cage electron transfer between a 19-elec…
Abstract The aggregate morphologies of silver, gold, and mixed silver–gold nanoparticles coated with fuchsine basic were directly investigated by means of transmission electron microscopy. It was found that the aggregation of silver and gold colloids induced by the adsorption of fuchsine basic displayed different aggr…
Novel macrocyclic dendrimers (Scheme 2), having two cis -1,3,5-cyclohexanetricarboxamide ( 1 ) or 1,3,5-benzenetricarboxamide units ( 3 ) in their core, were synthesized, and their self-assembly behaviors were evaluated in solution. Infrared spectroscopy of cis -1,3,5-cyclohexanetricarboxamide cored dendrimer ( 1 ) in…
The quickly growing number of newly synthesized families of dendrimers is not always followed by the information about their properties. Especially, the biological aspect seems not to be explored sufficiently. The aim of this study was to examine the hemotoxicity and cytotoxicity of water-insoluble, fifth-generation t…
Let X be a smooth variety over a field of characteristic p > 0. We prove that the forgetful functor from the category of overconvergent F -isocrystals on X to that of convergent F -isocrystals is fully faithful.The argument uses the quasi-unipotence theorem for overconvergent F -isocrystals (recently proved independen…