Materials Literature
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The method of medial-reduction has been developed for the synthesis of carbon nanotubes and nanobelts. In this process, Mg was used as reductant, and Na 2 CO 3 and CCl 4 were used as carbon sources, respectively. X-ray power diffraction (XRD) patterns were used to identify the designed reaction process and carbon stru…
Zn and Pd complexes of meso-tetraphenyltetranaphthaloporphyrins (Ph(4)TNP) exhibit strong infrared absorption bands and luminesce in solutions at room temperature. S1 --> S0 fluorescence (lambda(max) = 732 nm, phi = 5.3%) is the predominant emission in the case of ZnPh(4)TNP (1). This emission is in part due to the de…
Lyotropic liquid-crystalline (LLC), transition metal salt:oligo(ethylene oxide) nonionic surfactant (C n H 2 n +1 (CH 2 CH 2 O) m OH, denoted as C n EO m ), systems have been studied by means of diffraction, microscopy, and spectroscopy to elucidate the structural, thermal, and templating properties. In the system, th…
Deep oxidation of methanol was conducted using a novel Pt/BN catalyst in a steady-state-flow reactor. Hexagonal boron nitride (BN) is a graphitelike material in powder form with a specific surface area of 49 m 2 /g. A catalyst with 0.37 wt % Pt was prepared by the incipient wetness method using H 2 PtCl 6 as a precurs…
The preparation and characterization of three new paramagnetic complexes of the 17-electron Re(II) ion are reported. The salts [Re(triphos)(CH(3)CN)(3))][X](2), X = [BF(4)](-) (1), [PF(6)](-) (2), and [Et(4)N][Re(triphos)(CN)(3)] (3) were prepared by homolytic cleavage of the Re-Re bond in [Re(2)(CH(3)CN)(10)][BF(4)](…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPersistence of the Gyroid Morphology at Strong Segregation in Diblock CopolymersDrew A. Davidock, Marc A. Hillmyer, and Timothy P. LodgeView Author Information Department of Chemistry and Department of Chemical Engineering and Mater…
Catalytic activity of a synthetic multifunctional pore is studied in large unilamellar vesicles under conditions where substrate and synthetic catalytic pore (SCP) approach the membrane either from the same side (cis catalysis) or from opposite sides (trans catalysis). A synthetic supramolecular rigid-rod beta-barrel…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTMechanical α-Process in Polyethylene†Yongfeng Men, Jens Rieger, Hans-Friedlich Endeler, and Dieter LilgeView Author Information BASF Aktiengesellschaft, Polymer Physics, 67056 Ludwigshafen, Germany Basell Polyolefine GmbH, R&D, 6592…
The intercalation reaction of polyoxyethylene sulfate (PEGS) with Mg−Al−nitrate [Mg−Al−NO 3 ] layered double hydroxide (LDH) was investigated by using X-ray diffraction, infrared spectroscopy, and transmission electron microscopy (TEM). X-ray diffractograms showed that the basal spacing of the [Mg−Al−NO 3 ] LDH with P…
Memory effects in propylene/ethylene copolymer (cPP) systems containing different amounts of dibenzylidene sorbitol (DBS) have been studied using wide-angle X-ray scattering techniques. It has been observed that shear flow deformation applied to the melt state containing small amounts of DBS is templated into the crys…
Using in-situ small- and wide-angle X-ray scattering, we demonstrate that bundles with smectic ordering are produced by a step shear in a supercooled isotactic polypropylene melt. This occurs well before any formation of crystals. The period of the smectic mesophase is about 3.8 nm and depends neither on the shear rat…
Reactions of pyrrole (2) or 1-methylpyrrole (4) with readily available N-acylbenzotriazoles 1a-g (RCOBt, where R = 4-tolyl, 4-nitrophenyl, 4-diethylaminophenyl, 2-furyl, 2-pyridyl, 2-indolyl, or 2-pyrrolyl) in the presence of TiCl(4) produced 2-acylpyrroles 3a-g and 5a-g in good to excellent yields. 1-Triisopropylsily…
The microstructure of maleic anhydride (MA) grafted polyethylene (PE), MA- g -PE, has been successfully characterized by high-resolution NMR and FT-IR spectroscopy. The carbonyl asymmetric and symmetric stretchings of MA- g -PE exhibit lower shifts with an increase in the grafting degree of MA, suggesting stronger ind…
Reversible addition−fragmentation chain transfer (RAFT) is a versatile, controlled free radical polymerization technique that operates via a degenerative transfer mechanism in which a thiocarbonylthio compound acts as a chain transfer agent. The subsequent reduction of the dithioester end groups to thiols allows the p…
A simple expression for the composition dependence of the Flory-Huggins interaction parameter of polymer/solvent systems reported earlier is used to model the demixing of polymer solutions into two liquid phases. To this end the system specific parameters zeta and ny of that approach are calculated as a function of te…
Green nanocomposites based on renewable plant oils have been developed. Curing of epoxidized plant oils in the presence of organophilic montmorillonite produced triglyceride−clay nanocomposites showing flexible property. A nanocomposite with homogeneous structure was obtained, in which silicate layers of the clay were…
Dodecanethiol-stabilized gold nanoparticles with similar average size organize into different superlattice structures depending upon the method of preparation of the nanocrystals. Particles synthesized by the inverse micelle technique preferentially assemble into face-centered cubic (fcc) structures with long-range tr…
Prussian blue (PB) nanoparticles protected by poly(vinylpyrrolidone) (PVP) were prepared by mixing aqueous Fe2+, Fe(CN)63-, and PVP solutions together and were characterized by UV-vis, IR, XRPD, and TEM. Averaged dimensions of the nanoparticles were controlled between 12 and 27 nm depending on initial Fe ion concentra…
We have studied the optical properties of metallic nanoparticles with arbitrary shape. We performed theoretical calculations of the absorption, extinction, and scattering efficiencies, which can be directly compared with experiments, using the discrete dipole approximation (DDA). In this work, the main features in the…
The extinction coefficient per mole of nanocrystals at the first exitonic absorption peak, ε, for high-quality CdTe, CdSe, and CdS nanocrystals was found to be strongly dependent on the size of the nanocrystals, between a square and a cubic dependence. The measurements were carried out using either nanocrystals purifi…