Materials Literature
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Carbon nanotubes have extraordinary mechanical and electronic properties and hold great promise for future applications. The most important aspects of this structure are its low density, high aspect ratio, one dimensionality, high mechanical strength and high electrical and thermal conductivity. We present a short, st…
A novel microarray system that utilizes a porous aluminum-oxide substrate and flow-through incubation has been developed for rapid molecular biological testing. To assess its utility in gene expression analysis, we determined hybridization kinetics, variability, sensitivity and dynamic range of the system using amplif…
A set of samples co-doped with Er and Ag were prepared with a combined sol-gel and ion-exchange route. This multistep process sytnthesizes samples in which the silver atoms are dispersed in the matrix and/or aggregated in Ag multimers or nanoclusters. The samples exhibit a different photo-luminescence response dependi…
We report the isosteric heats of adsorption, q st, for butane on multiwalled carbon nanotubes (MWNTs) over a range of surface loadings at temperatures below the normal boiling point. Butane is a nonspherical, nonpolar molecule that may exhibit different orientations in multilayer adsorption. The morphology of our MWNT…
Thermoelectric modules should be selected or designed to meet the specific cooling/heating requirements of a particular application and in most cases, the cooling/heating capacity and the working temperatures (hot and cold side temperature of thermoelectric devices) are known. Computer modelling can be used to assist…
Flavodoxins are well known one-domain alpha/beta electron-transfer proteins that, according to the presence or absence of a approximately 20-residue loop splitting the fifth beta-strand of the central beta-sheet, have been classified in two groups: long and short-chain flavodoxins, respectively. Although the flavodoxi…
This paper presents the study of a hot strip made of thin rectangular electrical resistance with a thermocouple placed on its centre. The purpose was to simultaneously estimate thermal effusivity and conductivity in a limited time ( t 2 < 180 s) using a low cost probe. Heat transfer has been modelled with the quadrupo…
The flocculation of colloidal nanosheets of MnO2 with Al13 Keggin ions produces a novel pillared structure with a double-layer arrangement of Al13 species, which exhibits a large intersheet spacing of 2.3 nm and a well-defined mesoporosity. The Figure shows a schematic representation of the formation process.
The coalescence stability of poly(dimethylsiloxane) emulsion droplets in the presence of silica nanoparticles ( approximately 50 nm) of varying contact angles has been investigated. Nanoparticle adsorption isotherms were determined by depletion from solution. The coalescence kinetics (determined under coagulation cond…
Flavodoxins are classified in two groups according to the presence or absence of a approximately 20-residue loop of unknown function. In the accompanying paper (36), we have shown that the differentiating loop from the long-chain Anabaena PCC 7119 flavodoxin is a peripheral structural element that can be removed witho…
The 2 K field-dependent magnetization, M ( H ), of S = 3 / 2 [Ru II/III 2 (OAc) 4 ] + was studied. [Ru II/III 2 (OAc) 4 ] + exhibits an unusually low magnetization with respect to that predicted by the classical Brillouin function. This reduced value is a consequence of the large anisotropy arising from the large zero…
Ultrahigh pore density nanoporous films with cylindrical pores that are perpendicular to the substrate and parallel to each other have been fabricated, and the Al nanocylinders successfully removed (see Figure). The template-assisted growth of ultrahigh density Ni nanowire arrays have also been achieved by direct-curr…
The interactions between [Ru(bpy) 3 ] 2+ and the polyoxotungstate anion [S 2 W 18 O 62 ] 4- in acetonitrile solution were investigated using a combination of photophysics and optical and Raman spectroscopies. The presence of ion clusters of {[Ru(bpy) 3 ][S 2 W 18 O 62 ]} 2- ( K 2 = 7.7 × 10 5 ) and [Ru(bpy) 3 ] 2 [S 2…
Mesostructured silica tubes and rods were prepared by deposition of a prehydrolysed silica sol with surfactant onto the cylindrical pores of a polycarbonate (PC) membrane template, followed by calcination to remove the surfactant and membrane template. The tubular and rodlike morphologies of mesostructured silica were…
Although Lactococcus is one of the most extensively studied lactic acid bacteria and is the paradigm for biochemical studies of citrate metabolism, little information is available on the regulation of the citrate lyase complex. In order to fill this gap, we characterized the genes encoding the subunits of the citrate…
One-dimensional holographic photonic crystals that incorporate photochromic azobenzene-derived liquid crystals (LCs) have been produced. The additive photochromic molecules disrupt the host LC nematic order, inducing an isothermal phase transition and changing the effective dielectric properties of the LC layer (see F…
Pt nanoparticles are incorporated in the three-dimensional nanospace inside single-walled carbon nanohorns using a simple colloidal preparation method. The Pt particles are preferentially deposited inside nanohorns and are located near the defects (see Figure).
Abstract Layer‐by‐layer (LbL) assembly of polymer electrolyte multilayers is now a well‐established method for the fabrication of thin films by sequential adsorption of alternating layers of oppositely charged polyelectrolytes. Most commonly, such adsorptions have been from quiescent solutions of varying ionic strengt…
We have measured the electrical resistance R between the ends of a multiwall carbon nanotube during telescopic extension of the nanotube. R increases monotonically with extension and is hysteresis free, demonstrating that a telescoping nanotube constitutes a near-ideal nanometer-scale rheostat. The functional form of…
The refractive index dependence of the spontaneous emission rate is determined using organically capped CdSe and CdTe quantum dots as probes. The radiative lifetime of the exciton emission is measured in a variety of apolar solvents with refractive indices n between 1.37 and 1.50. It is demonstrated that quantum dots…