Materials Literature
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Abstract Nanocomposites based on biodegradable poly(butylene succinate) (PBS) and layered silicates were prepared by melt intercalation. Nonmodified montmorillonite (MMT) and MMTs (DA‐M, ODA‐M, ALA‐M, LEA‐M, and HEA‐M) organo‐modified by protonated ammonium cations {i.e., those of dodecylamine, octadecylamine, 12‐amin…
A new family of supramolecular, antiferromagnetically exchange-coupled dimers of single-molecule magnets (SMMs) has recently been reported. Each SMM acts as a bias on its neighbor, shifting the quantum tunneling resonances of the individual SMMs. Hysteresis loop measurements on a single crystal of SMM dimers have now…
We investigate the electronic, magnetic, and orbital properties of La0.5Ca0.5MnO3 perovskite by means of an ab initio electronic structure calculation within the Hartree-Fock approximation. Using the experimental crystal structure reported by Radaelli et al. [Phys. Rev. B 55, 3015 (1997)]], we find a charge-ordering s…
In this study we present a new method of measuring magnetostriction with an atomic force microscope adapted for the application magnetic fields. The experiment allows us to visualise, in an elegant and educational way how the lateral magnetoelastic shape changes take place on the sample surface when a magnetic field i…
Field emission formulae, current-voltage characteristics and energy distribution of emitted electrons, are derived analytically for a nonplanar (hyperboloidal) metallic emitter model. The traditional Fowler-Nordheim formulae, which are derived from a planar emitter model, are modified, and the assumption of the planar…
A [Cr(alpha,alpha'-diimine)3]3+ chromophore is used as a donor for sensitizing NdIII and YbIII near-infrared (NIR) emitters in the heterobimetallic helicates [LnCrIIIL3]6+. The intramolecular CrIII --> LnIII energy transfer process controls the population of the lanthanide-centered emitting levels, thus leading to unp…
With recent interest in seeking new biologically inspired device-fabrication methods in nanotechnology, a new biological approach was examined to fabricate Cu nanotubes by using sequenced histidine-rich peptide nanotubes as templates. The sequenced histidine-rich peptide molecules were assembled as nanotubes, and the…
Multilayers of charged polymers can be formed by the alternating adsorption of polyanions and polycations. By this so-called layer-by-layer self-assembly method, planar surfaces or colloidal templates can be coated. This method is reviewed here with respect to the basic physical principles governing multilayer formati…
This work updates the recent progress made toward fabricating a real-time, quantitative, and biocompatible glucose sensor based on surface-enhanced Raman scattering (SERS). The sensor design relies on an alkanethiolate tri(ethylene glycol) monolayer that acts as a partition layer, preconcentrating glucose near a SERS-…
Although they hold the promise of clean energy, state-of-the-art fuel cells based on polymer electrolyte membrane fuel cells are inoperable above 100 degrees C, require cumbersome humidification systems, and suffer from fuel permeation. These difficulties all arise from the hydrated nature of the electrolyte. In contr…
Information on the energy that is needed to transfer an electron from the valence band of an inorganic compound to a trivalent lanthanide impurity is presented. The energy is a measure of the location of the ground state of the divalent lanthanide relative to the top of the valence band. A variation with type of lanth…
Reflectance spectra of a ZnGeN2 epitaxial layer have been measured by using synchrotron radiation in the photon energy range of 2 to 120 eV. The peak of the reflectance spectra shifts to low energy by changing the direction of the electric vector. The optical constants including the complex index of refraction and the…
The TM0293 gene of Thermotoga maritima encodes γ-glutamyl phosphate reductase (GPR; EC 1.2.1.41), an enzyme that catalyzes the second step of proline biosynthesis, the reversible nicotinamide adenine dinucleotide phosphate (NADPH)-dependent reduction of L-γ-glutamyl phosphate to phosphate and L-glutamate 5-semialdehyd…
The crystal structure of GdS(2-x) is determined by single-crystal X-ray diffraction as a 144-fold superstructure of the ZrSSi structure type. The superstructure is described as a two-dimensional, commensurately modulated structure with the superspace group P4/n(alphabeta 1/2)(00)(ss) and with alpha = 1/4 and beta = 1/…
One of the most promising applications of encapsulated living cells is their use as protected transplanted tissue into the human body. A suitable system for the protection of living cells is the use of nano- or microcapsules of polyelectrolytes. These shells can be deposited easily on top of the cells by means of a la…
The TM0920 gene of Thermotoga maritima encodes a predicted iron-containing 1,3-propanediol dehydrogenase (EC 1.1.1.202) with a molecular weight of 39,944 Da and a predicted isoelectric point of 6.1. 1,3-propanediol dehydrogenase catalyzes the oxidation of propane-1,3-diol to 3-hydroxypropanal with the simultaneous red…
Abstract Dithienylethenes having a pyridinium cation at one and both thiophene rings were synthesized. The derivatives with two pyridinium cation showed the cyclization quantum yield as high as 0.71, which is much larger than the values of the monocation derivative and the neutral form. This can be explained by the co…
The novel structure of the delta1 phase in the cobalt-zinc system was determined by single-crystal X-ray diffraction. The structure features fused double icosahedra linked by edge- and face-sharing. The delta1-CoZn(7.8) structure is incommensurately modulated along the columnar b direction. The extent of the linear pe…
The structure of the transition metal oxide V6O13, a potential cathode material in lithium-polymer batteries, has been studied at 95 K using single-crystal X-ray diffraction (XRD). A phase transition has been determined by differential scanning calorimetry (DSC) measurements to occur at 153 K, with a heat of transitio…
Raw and dehaired Australian and Chinese Liaoning cashmere were evaluated for cashmere fibre curvature, cashmere fibre length, resistance to compression, and mean fibre diameter. Tested cashmere originated from commercial lots, and previous experimental samples. In Australian goats, cashmere fibre curvature was depende…