Materials Literature
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Electronic and magnetic structures of $A$-site ordered perovskite-type manganites, $\mathit{Ln}\mathrm{Ba}{\mathrm{Mn}}_{2}{\mathrm{O}}_{6}$ ($\mathit{Ln}=\mathrm{Sm}$ and Nd), located close to the multicritical point of the competing phases, have been investigated by measurements of resonant x-ray scattering, optical…
The ideal tensile strengths of the $\mathrm{B}2$-type $(\mathrm{CsCl})$ transition-metal aluminides $\mathrm{FeAl}$, $\mathrm{CoAl}$, and $\mathrm{NiAl}$ have been investigated using an ab initio electronic structure total energy method. The three materials exhibit dissimilar mechanical behaviors under the simulated i…
Abstract Summary: Soluble multi‐walled carbon nanotubes ( s ‐MWNTs), obtained via amidation reaction of octadecylamine with purified multi‐walled carbon nanotubes ( p ‐MWNTs), were solution‐mixed with P(MMA‐ co ‐EMA) at various loadings. Compared to the p ‐MWNTs/P(MMA‐ co ‐EMA) composites, the s ‐MWNTs/P(MMA‐ co ‐EMA)…
New dimeric cholesterol-based viologen derivative 1 has been prepared and can form a very stable supergel in 1-butanol. To characterize the aggregation mode of 1 in the organogel phase, transmission electron microscopy (TEM) images, small-angle X-ray diffraction (SAXRD) patterns, and circular dichroism (CD) spectra we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN,N'-Dicyanoquinone Diimines (DCNQIs): Versatile Acceptors for Organic ConductorsSiegfried Hünig and Edith HerberthView Author Information Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany Cite this: Chem. Rev. 2004, 104, 11, 5535–…
Using density-functional calculations, we show that the energetically favorable configurations of silicon monoxide clusters (SiO)n for n> or =5 facilitate the nucleation and growth of silicon nanostructures as the clusters contain sp3 silicon cores surrounded by silicon oxide sheaths. The frontier orbitals of (SiO)n c…
Novel porous-conductive chitosan scaffolds were fabricated by incorporating conductive polypyrrole (PPy) particles into a chitosan matrix and employing a phase separation technique to build pores inside the scaffolds. Conductive polypyrrole particles were prepared with a microemulsion method using FeCl3 as a dopant. T…
The electroactivity of electrogenerated polypyrrole films was degraded by applying consecutive anodic potential pulses (overoxidation). After each degradation step, the electroactivity of the material was recorded by voltammetric and chronoamperometric measurements. The charge consumed during each degradation step was…
Abstract New seven‐coordinate oxo(peroxo)molybdenum( VI ) complexes with bidentate chiral oxazolines, anionic κ 2 ‐ N , O ( V ) and neutral κ 2 ‐ N , N ( VI ), have been prepared and fully characterised by NMR spectroscopy and single‐crystal X‐ray diffraction studies. Dimetallic dioxo(μ‐oxo)molybdenum( VI ) compounds…
One of the most critical steps in the preparation of protein samples for structural studies by X-ray crystallography is to obtain biochemically pure and conformationally homogenous protein samples. Very often, the purified sample does not meet these qualifications and therefore does not crystallize. A screening method…
A novel mesoporous material prepared using the recently reported co-assembly of anionic surfactants with organosilane groups has been studied in depth using high-resolution transmission electron microscopy (HRTEM) and electron crystallography. A three-dimensional (3D) structural solution of AMS-8 was obtained by Fouri…
The charge density of urea is studied using very high precision single-crystal synchrotron-radiation diffraction data collected at the Swiss-Norwegian Beam Lines at ESRF. An unprecedented resolution of 1.44 A(-1) in sin theta;/lambda is obtained at 123 K. The optimization of the experiment for charge-density studies i…
The freezing and melting behavior of gallium (Ga) encapsulated in carbon nanotubes was investigated through in situ observation in a transmission electron microscope. It is shown that Ga remains liquid up to $\ensuremath{-}80\text{ }\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ when encapsulated in carbon nanotubes.…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAffinity Selection of Peptide Phage Libraries against Single-Wall Carbon Nanohorns Identifies a Peptide Aptamer with Conformational VariabilityDaisuke Kase, John L. Kulp, Masako Yudasaka, John Spencer Evans, Sumio Iijima, and Kiyotaka ShibaView Author Information Department of…
Recent studies suggest that soluble oligomers of amyloid-forming peptides have toxic effects in cell cultures. In this study, the folding of three Alzheimer's A beta(16-22) peptides have been simulated with the activation-relaxation technique and a generic energy model. Starting from randomly chosen states, the predic…
A comprehensive surface reaction mechanism on Pt is presented that is capable of describing CO oxidation, H 2 oxidation, water−gas shift (WGS), preferential oxidation (PROX) of CO, and the promoting role of H 2 O on CO oxidation reasonably well. This mechanism consists of a literature CO oxidation model, a surface rea…
$(1\ifmmode\times\else\texttimes\fi{}1)$ and $(2\ifmmode\times\else\texttimes\fi{}1)$ reconstructions of the (001) $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ surface were studied using the first-principles full-potential linear muffin-tin orbital method. Surface energies were calculated as a function of $\mathrm{Ti}{\ma…
The phase stability of the MgMn2O4 spinel has been studied by means of high-pressure X-ray diffraction for pressures up to 30 GPa. Two samples with different inversion degrees have been considered. Both spinels undergo a phase transition towards an orthorhombic structure (CaMn2O4-type). For the more inverted sample th…
The lineshapes of the Raman excitation profiles for radial breathing modes in carbon nanotubes are shown to be strongly affected by interference effects that arise whenever strong optical transitions are separated by a small energy. This is the case in metallic zigzag and chiral tubes, where one-dimensional singularit…
According to a recent report by Park et al., ${\mathrm{ZnCNi}}_{3}$ is isostructural and isovalent to the superconducting $({T}_{c}\ensuremath{\sim}8\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ antiperovskite, ${\mathrm{MgCNi}}_{3}$, but shows no indication of a superconducting transition down to $2\phantom{\rule{0.3em}{0e…