Materials Literature
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We study proton diffusion in amorphous SiO2 from the atomic scale to the long-range percolative regime. Ab initio molecular dynamics suggest that the dominant atomic process consists in cross-ring interoxygen hopping assisted by network vibrations. A statistical analysis accounting for the disorder in amorphous SiO2 y…
Recently, an unusual integer quantum Hall effect was observed in graphene in which the Hall conductivity is quantized as ${\ensuremath{\sigma}}_{xy}=(\ifmmode\pm\else\textpm\fi{}2,\ifmmode\pm\else\textpm\fi{}6,\ifmmode\pm\else\textpm\fi{}10,\dots{})\ifmmode\times\else\texttimes\fi{}{e}^{2}∕h$, where $e$ is the electro…
A method of calculating the number and nature of rigid unit modes (RUMs) in linearly bridged framework structures is presented. Using this approach, it is shown that linearly bridged framework structures inherently possess large degrees of structural flexibility, irrespective of their connectivity (i.e., framework top…
The local spin-density functional approximation is increasingly being used for materials applications such as predicting structural and magnetic properties. The recently aquired ability to model low-lying magnetic excitations like magnons is used for deriving useful formulae to estimate the Curie (Neel) temperatures o…
Deconvolution of the absorption spectrum of single-walled carbon nanotubes (SWNTs) into distinct (n,m) contributions is complicated because transition energies are closely spaced. The algorithm presented in this work attempts to simplify the problem by grouping nanotubes with similar transition energies and assigning…
(La 0.75 Sr 0.25 )Cr 0.5 Mn 0.5 O 3- δ (LSCM) has recently been shown to be an efficient redox stable anode for solid oxide fuel cells (SOFCs). The structure of LSCM has been investigated by X-ray diffraction and neutron diffraction to further understand its properties under SOFC operating conditions. Samples were pre…
A significant body of evidence indicates that particles with excessively high or low mobility relative to Brownian particles form in dynamic equilibrium in glass-forming liquids. We examine whether these "dynamic heterogeneities" can be identified with a kind of equilibrium polymerization. This correspondence is first…
A novel synergistic effect during supramolecular host−guest encapsulations of core−shell amphiphilic hyperbranched polymers to two kinds of dyes was reported. Two kinds of palmityl chloride-modified hyperbranched polymer, polyamidoamine (HPAMAM10K-C16) and poly(sulfone−amine) (HPSA11K-C16), were used as the hosts of s…
Hollow cadmium molybdate microspheres have been successfully prepared via a template-free aqueous solution method with the assistance of NaCl at room temperature. The structure and morphology of the CdMoO(4) hollow microspheres were characterized by X-ray diffraction, field-emission scanning electron microscopy, and t…
The aim of this work is to further improve the molecular generality and substrate generality of SERS (i.e., to fully optimize the SERS activity of transition-metal electrodes). We utilized a strategy of borrowing high SERS activity from the Au core based on Au-core Pt-shell (Au@Pt) nanoparticle film electrodes, which…
We present here a facile method for the preparation of TiO2-based superhydrophobic surfaces. It consists of two steps: (1) roughening of the TiO2 surface with a rf (radio frequency) plasma with CF4 as an etchant and (2) modification of the roughened TiO2 surface with an octadodecylphosphonic acid (ODP) monolayer. Plas…
Spider silk has been extensively studied for its outstanding mechanical properties. Partial intermediate and C-terminal sequences of different spider silk proteins have been determined, and during the past decade also N-terminal domains have been characterized. However, only some of these N-terminal domains have been…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Well-Defined Polythiophene with Oxyethylene Side Chain: Effect of Phosphine Ligands on Catalyst-Transfer PolycondensationIsao Adachi, Ryo Miyakoshi, Akihiro Yokoyama, and Tsutomu YokozawaView Author Information Departme…
We present first-principles electronic structure calculations of Mn doped III-V semiconductors based on the local spin-density approximation (LSDA) as well as the self-interaction corrected local spin density method (SIC-LSD). We find that it is crucial to use a self-interaction free approach to properly describe the…
It is proposed in this study to observe the influence of P2O5 on the formation of the apatite-like layer in a bioactive glass via a complete PIXE characterization. A glass in the SiO2-CaO-P2O5 ternary system was elaborated by sol-gel processing. Glass samples were soaked in biological fluids for periods up to 10 days.…
Magnetic nanoparticles of gamma-Fe2O3 coated by organic molecules and suspended in liquid and solid matrices, as well as a non-diluted magnetic fluid have been studied by electron magnetic resonance (EMR) at 77-380 K. Slightly asymmetric spectra observed at room temperature become much broader, symmetric, and shift to…
We demonstrate that the size of the electric-field-induced Rashba spin splitting in an 80 nm wide modulation-doped InGaSb quantum well can depend strongly on the spatial variation of the electric field. In a slightly asymmetric quantum well it can be an order of magnitude stronger than for the average uniform electric…
First-principles calculations of the $\ensuremath{\Sigma}5(310)[001]$ symmetric tilt grain boundary in Cu with Bi, Na, and Ag substitutional impurities provide evidence that in the phenomenon of Bi embrittlement of Cu grain boundaries electronic effects do not play a major role; on the contrary, the embrittlement is m…
In this paper, we study the effect of strain relaxation on the magnetotransport properties of La 0.7 Ca 0.3 MnO 3 (LCMO) epitaxial films (200 nm thick), which were deposited by pulsed laser deposition technique under identical conditions. All the films are epitaxial and have a cubic unit cell. The amount of strain rel…
Cobalt-substituted nickel–copper ferrite samples having the chemical formula Ni 0.95− x Co x Cu 0.05 Fe 2 O 4 , where x varies as 0.01, 0.02 and 0.03, were prepared by the standard double sintering ceramic technique. The formation of the ferrite phase was confirmed by x-ray diffraction (XRD) studies. Resistivity and t…