Materials Literature
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The oxidative etching of single walled carbon nanotubes (SWNTs) is useful for opening the end caps and the sidewalls of the nanotubes to provide access to the interior. We have studied the effect of successive treatment of SWNTs by 95% pure O(3)(g), which is a powerful and convenient oxidizing agent. The surface area…
Abstract Nanocomposite materials were prepared with an amorphous poly(styrene‐ co ‐butyl acrylate) latex as a matrix with multiwalled carbon nanotubes (MWNTs) as fillers. The microstructure of the related films was observed by transmission electron microscopy, which showed that a good dispersion of MWNTs within the ma…
The synthesis of dendrimer-like polystyrene (PS) of second and third generations by combination of atom transfer radical polymerization (ATRP) and chain end modifications is reported. Calixarene-based cores were used as initiators for ATRP of styrene yielding star polymers containing precisely 4, 6, or 8 arms. The lat…
BaAg 2 SnSe 4, BaCu 2 SnSe 4, and Ba 3 Cu 2 Sn 3 Se 10 were prepared by directly reacting the elements in stoichiometric ratios at 800 °C, followed by long heating between 600 and 650 °C. BaAg 2 SnSe 4 crystallizes in the BaAg 2 SnS 4 type, space group I 222, BaCu 2 SnSe 4 in the SrCu 2 GeSe 4 type, space group Ama 2,…
The reaction of [Mn(3)O(O(2)CMe)(6)(py)(3)] with the tripodal ligand H(3)thme (1,1,1-tris(hydroxymethyl)ethane) affords the enneanuclear complex [Mn(9)O(7)(O(2)CCH(3))(11)(thme)(py)(3)(H(2)O)(2)] 1.1MeCN.1Et(2)O. The metallic skeleton of complex 1 comprises a series of 10 edge-sharing triangles that describes part of…
How does a liquid freeze if the geometry of its particles conflicts with the symmetry of the crystal it should naturally form? We study this question in the simplest model system of particles exhibiting such a symmetry mismatch: hard pentagons in two dimensions. Using isobaric and isotensic Monte Carlo simulations we…
Water-soluble poly(4-(2,3-dihydrothieno[3,4- b ][1,4]dioxin-2-yl-methoxy)-1-butanesulfonic acid (PEDOT-S) has been synthesized both chemically and electrochemically, and the properties of the resultant films have been examined and compared. In particular, it was found that PEDOT-S, deposited in conjunction with poly(a…
The functional form of the photoluminescence (PL) line shape from individual single-walled carbon nanotube (SWNT) species is found to contain a significant Lorentzian component and the Stokes shift is observed to be very small $(<8\phantom{\rule{0.3em}{0ex}}\mathrm{meV})$, which suggests an excitonic dephasing mech…
The electronic screening length, the distance over which an electric field is attenuated in a material, imposes a lower physical bound on the lateral size scaling of semiconductor field effect devices. Alternatives will be needed to achieve devices whose characteristic dimensions approach a nanometer. In this work, we…
We demonstrate the dispersion and noncovalent functionalization of carbon nanotubes in water using peptide amphiphiles each consisting of a short hydrophobic alkyl tail coupled to a more hydrophilic peptide sequence. The assembly of peptide amphiphile molecules on the surfaces of carbon nanotubes adds biofunctionality…
[reaction: see text] The synthesis and some properties of two novel DTPA-bisamides are reported. These derivatives were designed as enzyme-activated contrast agents (CA) for magnetic resonance imaging. Both derivatives bear tyramido or 5-hydroxytryptamido groups that could be oligomerized in situ in the presence of pe…
By using combination of detailed experimental studies, we identify the metastable and stable energy levels of EL2 in semi-insulating GaAs. These results are discussed in the light of the recently proposed models for stable and metastable configurations of EL2 in GaAs.
The photoluminescence spectra of band-edge transitions in GaN is studied as a function of temperature. The parameters that describe the temperature dependence red-shift of the band-edge transition energy and the broadening of emission line are evaluated using different models. We find that the semi-empirical relation…
Fabrication of single nickel-nitrogen (NE8) defect centers in diamond by chemical vapor deposition is demonstrated. Under continuous-wave 745nm laser excitation single defects were induced to emit single photon pulses at 797nm with a linewidth of 1.5nm at room temperature. Photon antibunching of single centers was dem…
Supercapacitor electrodes based on pyrrole treated-functionalized single wall carbon nanotubes (SWNTs) were developed. High values of capacitance (350 F/g), power density (4.8 kW/kg), and energy density (3.3 kJ/kg) were obtained in 6 M KOH, and the capacitance is almost 7 times that of the control buckypaper. Specific…
A computational method is presented to resolve hydrodynamic interactions acting on solid particles immersed in incompressible host fluids. In this method, boundaries between solid particles and host fluids are replaced with a continuous interface by assuming a smoothed profile. This enabled us to calculate hydrodynami…
Electrochemical impedance spectroscopy was conducted on a series of hydrous ruthenium oxides, RuO(2).xH(2)O, (x = 0.5, 0.3, 0) and a layered ruthenic acid hydrate (H(0.2)RuO(2.1).nH(2)O) in order to evaluate their protonic and electronic conduction. The capacitor response frequency was observed at lower frequency for…
The phase relationships of the In 2 O 3 −TiO 2 −CaO and In 2 O 3 −TiO 2 −SrO systems have been studied at 1350 °C in air. The In 2 O 3 −TiO 2 −CaO system contains a ternary compound Ti 6 In 6 CaO 22 crystallizing in an incommensurate structure. The In 2 O 3 −TiO 2 −SrO system, on the other hand, is a simple ternary ph…
Abstract Summary: A foaming apparatus for gas treatment is proposed. Despite a small amount of required liquid, the foaming column can be used not only for polluted gas treatment, but also for a specific type of water and for wastewater purification. In general, the electrical discharge may be applied directly to the…
Tyvelose is a unique 3,6-dideoxyhexose found in the O antigens of some pathogenic species of Yersinia and Salmonella. It is produced via a complex biochemical pathway that employs CDP-D-glucose as the starting ligand. CDP-D-glucose 4,6-dehydratase catalyzes the first irreversible step in the synthesis of this 3,6-dide…