Materials Literature
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Dissimilar coiled carbon nanotubes were prepared by catalytic chemical vapor deposition (CCVD) on finely divided Co nanoparticles supported on silica gel under reduced pressure and at lower gas flow rates. The morphology of the regular coiled carbon nanotubes were examined by TEM, while the polygonization characterist…
By measuring the strain across the premartensitic transition without and with external dc magnetic fields applied along the [001] and [010] directions of the parent phase, respectively, the characteristics of the premartensitic transition strain is investigated in detail. It was found that not only does the premartens…
Preparation of the conjugated polymer poly(1,4-phenylene vinylene) (PPV) inside the channels of the mesoporous silica MCM-41 is described. Polymerization was initiated inside the channels by deprotonated surface hydroxy groups. Presence of PPV was observed by infrared, absorption, and luminescence spectroscopy. A pore…
The neglect of excluded volume interaction in light scattering from randomly branched macromolecules leads to misinterpretation of the angular dependence. With a space correlation function of general fractal behavior γ( r ) = Ae -( r /ξ )/( r /ξ) 3- d Feltoft et al. ( Phys. Rev. B 1986, 33, 269) derived the correspond…
The Lewis structures that contribute to the imidazolium protonated cation resonance hybrid can be explained in a unified way in terms of the Fukui function (density functional descriptor) and the local hard and soft acids and bases principle. The results obtained open the possibility of analyzing the resonance contrib…
In this article, we present results of the RAPET dissociation of MoO(OMe)4 at 700 degrees C in a closed Swagelok cell. The reaction produces molybdenum dioxide nanoparticles (20 nm) coated with carbon (20 nm). We have also carried out the same reaction under an applied magnetic field of 10 T. This reaction yielded dif…
The conformational dynamics of poly(acrylic acid) induced by pH change is reported here. Poly(acrylic acid) immobilized on gold surface was exposed to pH changes, and the conformational changes thus induced were followed in real time using surface plasmon resonance spectroscopy. The temporal profile of the stretching-…
We report on the structural, magnetic and magnetotransport effects promoted by Nd 3+ substitution in Nd x Sr 2− x FeMoO 6 . In spite of the fact that the ionic radius of Nd 3+ is smaller than that of Sr 2+ , the unit cell volume remains constant across the series. We also show that the incorporation of Nd 3+ induces a…
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…