Materials Literature
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The structure of ordered mesoporous carbon materials CMK-5 was analyzed in detail by transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis by applying the recently developed continuous density function technique. The materials present two-dimensional (2-D) hexagonally ordered arrays of carbon nan…
A previous paper described the low-temperature synthesis of mesoporous nanocrystalline anatase thin layers obtained by mesophase templating ( Chem. Mater . 2003, 15, 2463). This work deals with the structural characterization of these anatase thin layers and with the extension of the synthesis method to films with a d…
Silk synthesis is an ancestral character of both the Lepidoptera and the Araneae. Araneae evolution is marked by an increased commitment to a silk-producing physiology. At least three major Araneae speciation events are correlated with the evolution of new silk-producing glands and new silk proteins. In contrast, alth…
Abstract Supercritical trifluoromethane (scCHF3) has been used as an electrolytic medium for the electrooxidative polymerization of pyrrole and thiophene; both monomers could be electropolymerized apparently faster in scCHF3 than in the coventional organic media like an acetonitrile solution, and the obtained films ha…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis and Characterization of Macroalkoxyamines Based on PolyethyleneRicardo Godoy Lopez, Christophe Boisson, Franck D'Agosto, Roger Spitz, Fernande Boisson, Denis Bertin, and Paul TordoView Author Information Laboratoire de Chi…
The electrochemical linear actuation of polyaniline fiber actuators has been studied in a variety of acidic aqueous electrolytes. Experimental results show that the linear strain changes significantly but nonlinearly with the anion volume. For anions smaller than Br-, a larger strain was obtained for a larger anion, t…
Associative phase separation (complex coacervation) in a mixture of oppositely charged polyelectrolytes can lead to different types of (inter-)polyelectrolyte complexes (soluble micelles, macroscopic precipitation). In a previous report [Langmuir 2004, 20, 2785-2791], we presented a model for the electrostatic free en…
The ultrafast photoisomerization of a push−pull substituted azobenzene (4-nitro-4‘-(dimethylamino)azobenzene, NA) is studied by means of femtosecond fluorescence and absorption spectroscopy. The fluorescence dynamics is biphasic. The initial fluorescence with a narrow and intense spectrum decays in ∼100 fs. This decay…
Two new block copolymers containing dimethylsiloxane and semifluorinated styrene blocks (BSF6 and BSF8) were prepared using a polysiloxane azo-macroinitiator and corresponding semifluorinated styrene monomers StyF6 and StyF8. The thermal properties of the block copolymers were investigated by DSC, which showed the for…
This work describes how manipulation at the molecular level of V 2 O 5 /polyaniline (PANI) nanocomposites built with the layer-by-layer (LBL) technique promotes enhancement of charge storage capability, new electrochromic effects, and control of ionic flux. By changing the film architecture we control the amount of PA…
Nonconstitutive membrane-active proteins, such as diphtheria toxin, must refold on membrane interfaces in the course of membrane penetration. A useful step in deciphering this process is to understand quantitatively the energetics of interface-mediated insertion of model transmembrane helices. A difficulty is that pep…
Silicalite-1 powders with crystal sizes ranging from 20 to 1000 nm were synthesized by systematically varying synthesis gel composition, pressure, temperature, and time duration. These samples were characterized by powder X-ray diffraction, scanning electron microscopy, nitrogen adsorption isotherms, solid-state nucle…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHigh Aqueous Solubility of Functionalized Single-Walled Carbon NanotubesK. A. Shiral Fernando, Yi Lin, and Ya-Ping SunView Author Information Department of Chemistry, Howard L. Hunter Laboratory, Clemson University, Clemson, South Carolina 29634-0973 Cite this: Langmuir 2004, 2…
ADVERTISEMENT RETURN TO ISSUEPREVNotePreparation of Ultrahigh-Aspect-Ratio Hydroxyapatite Nanofibers in Reverse Micelles under Hydrothermal ConditionsMinhua Cao, Yonghui Wang, Caixin Guo, Yanjuan Qi, and Changwen HuView Author Information Institute of Polyoxometalate Chemistry, Northeast Normal University, Changchun,…
Experiments to determine the resistivity and charge-carrier mobility in semiconducting carbon nanotubes are reviewed. Electron transport experiments on long chemical-vapour-deposition-grown semiconducting carbon nanotubes are interpreted in terms of diffusive transport in a field-effect transistor. This allows for ext…
I report systematic first-principles calculations of the quaternary Heusler alloys, e.g. Co 2 [Cr 1− x Mn x ]Al, Co 2 Mn[Al 1− x Sn x ] and [Fe 1− x Co x ] 2 MnAl. I show that these alloys are also half-ferromagnets when the normal Heusler compounds corresponding to concentration values of zero and unity are half-meta…
Nanostructured and nanorod-shaped three-dimensional In2O3 were deposited on stainless steel (SS) by a novel potentiodynamic method at a high scan rate of 200 mV s-1. In2O3/SS electrodes were found to exhibit high specific capacitance, high power density, and long-term stability when used as active electrode materials…
A new Y−Fe alkoxide, [YFe(OPr i ) 6 (Pr i OH)] 2, is used in the sol−gel process to obtain the orthoferrite, YFeO 3 . The Y/Fe stoichiometry (1:1) and Y−O(R)−Fe chemical links in the single molecular precursor kinetically control the formation of metastable YFeO 3 which is otherwise difficult to prepare due to the eas…
Amphiphilic block copolypeptides were prepared through transition-metal-mediated polymerization of amino acid N -carboxyanhydrides. In aqueous solution these materials form strong hydrogels at low concentrations. The self-assembly process that is responsible for gelation was investigated by measuring the rheological p…
CO2 laser induced pyrolysis of silane was used to produce silicon nanoparticles with an average diameter as small as 5 nm at high rates (up to 200 mg/h). Etching these particles with a mixture of hydrofluoric acid (HF) and nitric acid (HNO3) reduces their size and passivates their surface such that they exhibit bright…