Materials Literature
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Perturbed projection for linear scaling solution of the coupled-perturbed self-consistent-field equations [Weber, Niklasson and Challacombe, Phys. Rev.\ Lett. {\bf 92}, 193002 (2004)] is extended to the computation of higher order static response properties. Although generally applicable, perturbed projection is devel…
We present a first-principles calculation of the electronic conduction properties of single-row sodium nanowires suspended between semi-infinite electrodes. The conductance of the nanowire is ~1 G0 (=2e^2/h) and oscillates with a two-atom period as the number of the atoms within the nanowire varies. Moreover, we obser…
We present detailed first-principles calculations of the electron-conduction properties of a three-sodium-atom nanowire suspended between semi-infinite crystalline Na(001) electrodes during its elongation. Our investigations reveal that the conductance is ~1 G0 before the nanowire breaks and only one channel with the…
The degenerate four-wave mixing spectroscopy of uniaxially strained GaN layers is demonstrated using colinearly polarized laser pulses. The nonlinear response of FWM signal on exciton oscillator strength enhances the sensitivity for polarized exciton, allowing for mapping out the in-plane anisotropy of the strain fiel…
Towards a novel magnetoresistance (MR) device with a carbon nanotube, we propose ``nonmagnetic metal/zigzag nanotube encapsulating magnetic atoms/nonmagnetic metal'' junctions. We theoretically investigate how spin-polarized edges of the nanotube and the encapsulated magnetic atoms influence on transport. When the on-…
The boundary conditions, customarily used in the Landau-type approach to ferroelectric thin films and nanostructures, have to be modified to take into account that a surface of a ferroelectric (FE) is a defect of a ``field'' type. The surface (interface) field is coupled to a normal component of polarization and, as a…
Dramatic increases in the luminescent lifetime of the Er3+ ion in a molecular complex have been observed by chelating the rare-earth ion with a perfluorinated imidodiphosphinate sensitizing ligand, F-tpip. For solution, powder, and evaporated thin films of Er(F-tpip)3, the average lifetimes of the 1530 nm emission ban…
Tunable mesostructures and ultrafine particle sizes were achieved by means of triblock-copolymer and fluorocarbon surfactants, respectively, in the hydrothermal synthesis of mesoporous silica nanoparticles. The TEM image shows one such nanoparticle with a diameter of approximately 300 nm.
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTNext Generation, High Relaxivity Gadolinium MRI Agents†Kenneth N. Raymond and Valérie C. PierreView Author Information Department of Chemistry, University of California, Berkeley, California 94720-1460 Cite this: Bioconjugate Chem. 2005, 16, 1, 3–8Publication Date (Web):Decem…
The organic functionalisation of carbon nanotubes can improve substantially their solubility and biocompatibility profile; as a consequence, their manipulation and integration into biological systems has become possible so that functionalised carbon nanotubes hold currently strong promise as novel systems for the deli…
Abstract Raman scattering, optical absorption and photoluminescence studies have been performed on Er 3+ ‐doped Na 2 O–Nb 2 O 5 –GeO 2 germanate‐based glasses. The main bands in the Raman spectra involve vibrational modes associated with the germanium oxide network. Judd–Ofelt intensity parameters were determined and…
Abstract By using Monte Carlo simulation, the thickness of an aluminum oxide film in the nanometer range on aluminum sheets given different heat treatments was determined by electron probe microanalysis (EPMA) and compared with transmission electron microscopy (TEM). The film thickness was ≤50 nm. As a result, althoug…
Similarly, the National Institutes of Health consensus development conference of 1982 defined a biomaterial as “any substance other than a drug, or combination of substances, synthetic or natural in origin which can be used for any period of time as a whole or as a part of the system that treats, augments, or replaces…
Abstract Copper foils have been widely used in microelectronic devices. Adequate adhesion between copper foils to various substrates, such as Si, SiO 2 , polyimide, is crucial to high performance of these devices. The adhesion between a new high temperature adhesive, aromatic thermosetting copolyester (ATSP), and vari…
Abstract A star‐shape styrene–butadiene–styrene triblock copolymer SBS (802) was synthesized and fractionated into four fractions coded as 802‐F1 (four arms), 802‐F2 (two arms), 802‐F3 (one arm), and 802‐F4 by repeating fractional precipitation. Their weight‐average molecular weight ( M w ) was measured by size‐exclus…
Ab initio plane-wave pseudopotential density functional theory (DFT) calculations have been carried out to determine the atomic and electronic structure of the $\mathrm{K}∕\mathrm{Si}(111)\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}R{30}^{\mathrm{\ifmmode^\circ\else\textdegree\fi{}}}\text{\ensuremath{-}}B$ adsor…
Abstract A negative type photosensitive polyimide with alicyclic moiety (NPI) was synthesized from 5‐(2,5‐dioxotetrahydrofuryl)‐3‐methyl‐3‐cyclohexene‐1,2‐dicarboxylic anhydride and 4,4‐diaminobenzophenone by one‐step polymerization in m ‐cresol. Properties of the polyimides were characterized and a photo‐crosslinking…
Abstract Recently, we demonstrated the possibility of synthesizing ordered nanowires of diluted magnetic II/VI semiconductors inside the channels of mesoporous silica host structures. Here, we expand this procedure from mesoporous powders to mesoporous thin films. Diluted magnetic semiconductors Cd 1– x Mn x S were sy…
Eine starke blaue Emission zeichnet hybride Cer(III)/Cer(IV)-phosphat-Nanoröhren aus, wohingegen Cer(III)-phosphat-Nanodrähte eine charakteristische zweigipflige UV-Lumineszenz zeigen (siehe Diagramm). Die Cerphosphatsysteme wurden durch Erhitzen neuartiger Cer(IV)-phosphat-Nanoröhren auf unterschiedliche Temperaturen…
SUMMARY Perlite is a glassy volcanic rock, which will, upon rapid controlled heating, expand into a frothy material of bulk density. Considering the fact that the uses of perlite are based primarily upon its physical and chemical properties, it is aimed to investigate some physical and chemical properties of unexpande…