Materials Literature
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Owing to their single atom-layer structure, actual bending stiffness of single-walled carbon nanotubes is much lower than that given by the elastic shell model if the commonly defined representative thickness is used. In this paper, it is proposed that the effective bending stiffness of single-walled nanotubes should…
Grazing-angle x-ray reflectivity (XRR) is described as an efficient, nondestructive, parameter-free means to measure the mass density of various types of amorphous carbon films down to the nanometer thickness range. It is shown how XRR can also detect layering if it is present in the films, in which case the reflectiv…
It is shown that a certain class of self-affine profiles of surface roughness may render any substrate with a non-zero microscopic contact angle non-wet, i.e. , give it a macroscopic contact angle close to 180 degrees. This is in some contrast to previous work and not only of potential applicational interest, but may…
Multiwall carbon nanotubes are produced by decomposition of acetylene at 600 °C on metal catalysts supported on NaY zeolite. The support and the metal are eliminated by dissolving them in aqueous hydrofluoric acid (HF). Two methods were used to eliminate the pyrolitic carbon: oxidation in air at 500 °C and oxidation b…
The dispersion process of Ag nanoparticles into vapor-deposited nylon 11 thin films caused by heat treatment has been investigated. In situ optical transmission and Fourier transform infrared (FT-IR) reflection absorption spectroscopy were used independently for characterizing the changes in the surface plasmon resona…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis, Structure, and Magnetic Properties of a New Ternary Zintl Phase: Sr21Mn4Sb18Hyungrak Kim, Cathie L. Condron, Aaron P. Holm, and Susan M. KauzlarichView Author Information Department of Chemistry, University of California One Shields Avenue, Davis, California…
Two new aryl−ethynyl end-cap model compounds, N -phenyl-4-(1-naphthylethynyl)phthalimide ( 1 ) and N -phenyl-4-(2-naphthylethynyl)phthalimide ( 3 ), were synthesized and characterized. The single-crystal molecular structure of 1 reveals an alternating “head to tail” packing mode whereas the “heads and tails” of 2 are…
Chemical modification of Ar plasma-pretreated poly(tetrafluoroethylene) (PTFE) film by UV-induced graft copolymerization with glycidyl methacrylate (GMA), followed by oxidative graft copolymerization of aniline and reactive immobilization of polyaniline (PANI) chains have been carried out to render the PTFE surface co…
CoMgAl-hydrotalcite-like compounds (Co a Mg b Al(OH) c (TA) d · n H 2 O) intercalated with terephthalate anions ([C 6 H 4 (COO) 2 ] 2- or TA 2- ) have been prepared. By using XRD, FTIR, ICP/CHN, DTA, TGA, combined TGA-FTIR, HRTEM, and XPS methods, it has been found that the as-prepared samples undergo different decomp…
Several molecular structure-property relationships are presented and compared to illustrate our current understanding of macromolecular encapsulation using dendrimers. Specifically, the effect that dendrimer architectures have on encapsulating photoactive and redox-active units fixed at the molecular core is considere…
The formation process of CdS nanorods prepared by the reaction of thiourea and cadmium nitrate in ethylenediamine was investigated in detail by X-ray powder diffraction, transmission electron microscopy, selected-area electron diffraction, and IR techniques. An accordion-like folding process was proposed to account fo…
The local structure of V oxide/ZSM-5 catalysts prepared by the solid-state reaction of the ZSM-5 zeolites having different Si/Al ratios have been investigated by means of in situ photoluminescence spectroscopy in combination with other spectroscopic techniques such as UV−Vis, solid-state NMR, and ESR. It was found tha…
Crystal-engineering strategies have been systematically developed for the rational design by self-assembly of diverse metalloporphyrin molecular-sieve materials. Cooperative coordination and hydrogen bonding algorithms of molecular recognition proved particularly useful for this aim. The supramolecular concepts used i…
The structural dependence of the coupling constant in a series of [L 3 Cu(μ-C 2 O 4 )CuL 3 ] 2+ complexes is analyzed by means of ab initio difference-dedicated configuration interaction (DDCI2) calculations on the model (μ-oxalato)bis[triamminecopper(II)] cation, [(NH 3 ) 6 Cu 2 (μ-C 2 O 4 )] 2+, in which the nitroge…
Second-order Møller−Plesset perturbation theory has been used to calculate the interaction energy between a water molecule and acenes as large as C 96 H 24. The results of these calculations lead to an estimated value of −5.8 ± 0.4 kcal/mol for the electronic binding energy of a water molecule with single-layer graphi…
A series of three perylene tetracarboxylic acid bisimide dyes 3 a–c bearing phenoxy substituents at the four bay positions of the perylene core were synthesized and their complexation behavior to complementary ditopic dialkyl melamines 8 a–c was investigated. Binding constants and Gibbs binding energies for the hydrog…
We consider an effective mass model for an electron-hole pair in a simplified confinement potential, which is applicable to both a nanoscopic self-assembled semiconducting InAs ring and a quantum dot. The linear optical susceptibility, proportional to the absorption intensity of near-infrared transmission, is calculat…
A mesoporous carbon was prepared from a carbon/silica nanocomposite. The composite was obtained by mean of a sol−gel process using tetraethoxy silane (TEOS) in the presence of furfuryl alcohol (FA) as a carbon precursor and then the silica framework was removed from the composite by HF treatment. It was found that the…
Polyhedral nano- and microstructures with shapes of faceted needles, rods, rings, barrels, and double-tipped pyramids, which we call graphite polyhedral crystals (GPCs), have been discovered. They were found in pores of glassy carbon. They have nanotube cores and graphite faces, and they can exhibit unusual sevenfold,…
The development of optical gain in chemically synthesized semiconductor nanoparticles (nanocrystal quantum dots) has been intensely studied as the first step toward nanocrystal quantum dot lasers. We examined the competing dynamical processes involved in optical amplification and lasing in nanocrystal quantum dots and…