Materials Literature
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Abstract We study the breathing‐like phonon modes of double‐walled carbon nanotubes in a simple analytical model by considering the tube walls as coupled oscillators. The force constant of the oscillator coupling is found to be proportional to the inner tube diameter. Thus, only for small‐diameter tubes, the shift of…
Abstract Poly[4,4′‐bis(butylsulfanyl)‐2,2′‐bithiophene] modified conventional‐size and (ultra)microelectrodes are first investigated in acetonitrile and quasi‐neutral aqueous solution with respect to the repeatability of the responses obtained both in cyclic voltammetry and in differential pulse voltammetry. The react…
We demonstrate a molecular rectifying junction made from a sequential self-assembly on silicon. The device structure consists of only one conjugated (p) group and an alkyl spacer chain. We obtain rectification ratios up to 37 and threshold voltages for rectification between -0.3V and -0.9V. We show that rectification…
Using the stabilized jellium model in two schemes of `relaxed' and `rigid', we have calculated the dissociation energies and the fission barrier heights for the binary fragmentations of singly-ionized and doubly-ionized Ag clusters. In the calculations, we have assumed spherical geometries for the clusters. Comparison…
Light- and voltage-induced changes in the microwave reflectivity of semiconductors can be used to study the kinetics and mechanisms of electron transfer at semiconductor|electrolyte interfaces. The theory of the method is developed and illustrated by numerical calculations of the steady-state microwave response for lo…
The adsorption state and morphology of tetracyanoquinodimethane (TCNQ) deposited from acetonitrile solutions onto atomically smooth native oxide surfaces of Al(111) films were investigated by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The analysis of the XP spectra of the deposited TCNQ…
Adhesive properties on glass of commercial zein and an inexpensive zein-lipid mixture isolated from dry-milled corn were investigated. A method was developed for uniformly preparing bonded glass panels and measuring the amount of pull required to separate the panels. The adhesive strength of commercial zein to glass w…
His26Tyr and His33Tyr mutants were obtained from the Cys102Thr variant of yeast iso-1-cytochrome c. Spectroscopic studies show that a mutation at position 26 at pH 7.0 enhances flexibility of the peptide, alters the heme pocket region and the axial coordination to heme-iron, and reduces protein stability. The His26Tyr…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEffect of Gold Nanoparticles as a Support for the Oligomerization of l-Cysteine in an Aqueous SolutionKensuke Naka, Hideaki Itoh, Yoshihiro Tampo, and Yoshiki ChujoView Author Information Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Yoshida…
Viscosity and light-scattering measurements are performed on two dilute aqueous solutions of regenerated silk fibroin (RSF) of Bombyx mori silkworms obtained by dialysis against 6 M LiBr and pure water solutions at ambient temperature. The reduced viscosity of the RSF solutions in 6 M LiBr is found to decrease with de…
Absorption spectra of single-walled carbon nanotubes (SWNT) dispersed in dimethylformamide (DMF) have been recorded in the visible to near-infrared range. Besides broad absorption bands, the spectra show a sharp peak at 5187 cm -1, which has been attributed in the literature to the absorption of semiconducting nanotub…
Colloidal gold nanoparticles self-assembled into macroscopic aggregates by charge-transfer interaction between pyrenyl units as an electron donor immobilized on the surface of the gold nanoparticles and a bivalent linker containing two dinitrophenyl units as electron acceptors. Transmission electron microscopy and sca…
The ion-nuclear distance of Gd(III) to a coordinated water proton, r(Gd)(-)(H), is central to the understanding of the efficacy of gadolinium-based MRI contrast agents. The dipolar relaxation mechanism operative for contrast agents has a 1/r(6) dependence. Estimates in the literature for this distance span 0.8 A (2.5-…
Single-wall carbon nanotubes (SWNTs) were fluorinated with F 2 at 250 °C, and then some were heated under He to temperatures ranging from 100 to 400 °C to desorb the fluorine. The resulting samples were studied with X-ray photoelectron spectroscopy, Raman spectroscopy, IR spectroscopy, and electrical resistance measur…
Extended angle-resolved noble metal nanostructures such as nanooverlaps, nanocontacts, nanogaps, and nanochains show diverse optical characteristics. Polarized microextinction spectroscopy demonstrates dichroic contrast varying between 20 and 200 nm upon comparing the optical spectra of the transverse and longitudinal…
Quasi-ordered, highly dispersed, gold nanoclusters of tightly controlled particle size were synthesized by dip-coating substrates with gold precursors encapsulated by block-copolymer micelles. By this method, gold particles (4.8 +/- 1.3 nm) were deposited on ITO-coated glass and shown to be catalytically active for el…
Abstract A numerical and experimental study of the plasma variables in the synthesis of polyaniline in radio‐frequency (RF) glow discharges is presented. The plasma variables were measured on the basis of data collected by electrostatic Langmuir probes placed along the reactor. The results showed the distribution of t…
Abstract A copper(II) and two nickel(II) dinuclear oxalato‐bridged compounds of formulae [{Cu(bpdto)} 2 ( μ ‐ox)](ClO 4 ) 2 ( 1 ), [{Ni(bpdto)] 2 ( μ ‐ox)](ClO 4 ) 2 ( 2 ), and [{Ni(bpdto)} 2 ( μ ‐ox)](NO 3 ) 2 ·2H 2 O ( 3 ), where bpdto = 1, 8‐bis(2‐pyridyl)‐3, 6‐dithiaoctane and ox = oxalate = C 2 O 4 2— anion, have…
Using numerical simulations we show that a variety of novel colloidal crystalline states and multi-step melting phenomena occur on square and triangular two-dimensional periodic substrates. At half-integer fillings different kinds of frustration effects can be realized. A two-step melting transition can occur in which…
We have carried out extensive molecular dynamics simulations of a supercooled polydisperse Lennard-Jones liquid with large variations in temperature at a fixed pressure. The particles in the system are considered to be polydisperse in both size and mass. The temperature dependence of dynamical properties such as the v…