Materials Literature
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Poly(p-phenylenevinylene)s with amines and pentafluorophenyl esters on side chains were synthesized and assembled on solid substrates by sequential layer-by-layer (LBL) deposition. This approach enables the creation of robust multilayer thin films via in-situ covalent coupling reactions between successive layers. The…
Abstract The crystalline structure and fibrillar texture of nylon‐6 fibers filled with nanosized particles were investigated using wide‐angle and small‐angle X‐ray scattering. As‐spun fibers filled with organic nanoparticles consisting of aromatic polyamide‐like hyperbranched molecules with amine‐terminating groups ex…
The vibrational properties of single-wall carbon nanotubes have been probed locally with atomic-scale resolution by inelastic electron tunneling spectroscopy with a low-temperature scanning tunneling microscope. The high spatial resolution has allowed the unraveling of changes in the local phonon spectrum related to t…
Most high strength aluminium alloys used in the aircraft industries are susceptible to corrosion. Up to now hexavalent chromium is the conventional corrosion inhibitor. Because chromium in hexavalent state is carcinogenic, it is necessary to develop effective alternative inhibitor systems. We investigated magnetron sp…
This experimental paper deals with phase separations of binary mixtures composed of a continuous liquid crystal phase and an isotropic dispersed phase. In contrast to isotropic binary mixtures, the investigated mixtures do not lead to a full phase separation but to a self-ordering of colloidal particles, as reported e…
We report in situ studies of SiO2 glass under pressure and find that temperature-induced densification takes place in a pressure window. To explain this effect, we study how rigidity of glasses changes under pressure, with rigidity percolation affecting the dynamics of local relaxation events. We link rigidity percola…
We report on the synthesis and characterization of ZnO and Er-doped ZnO nanostructures. ZnO powders were synthesized by the coprecipitation and the combustion techniques. ZnO powders prepared by the coprecipitation method exhibit sheet-like nanostructures. The sheet thickness is found to be less than 100 nm. The struc…
We present detailed results of blinking studies on individual silicon nanocrystals. The experiments show, that similar to II-VI semiconductor nanocrystals, the blinking process obeys a power law statistics. An excitation intensity dependence of the power law exponent is found for the off time probability distribution.…
Dendritic macromers are attractive macromolecules for hydrogel formation since high cross-linking densities at low polymer concentration can be obtained, varied physical properties can be observed based on the macromer structure, and low viscous aqueous solutions can be injected in an in vivo site of irregular shaped…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly Functionalized Tetrathiafulvalenes: Riding along the Synthetic Trail from Electrophilic AlkynesAlain Gorgues, Piétrick Hudhomme, and Marc SalléView Author Information Laboratoire de Chimie, Ingénierie Moléculaire et Matériaux d'Angers, UMR CNRS 6200, 2 Boulevard Lavoi…
The electronic structure and (13)C NMR chemical shift of (9,0) single-walled carbon nanotubes (SWNTs) are investigated theoretically. Shielding tensor components are also reported. Density functional calculations were carried out for C(30)-capped and H-capped fragments which serve as model systems for the infinite (9,…
The shape- and phase-controlled synthesis of ZnS nanocrystals (nanorods and nanodots) was realized by the selection of ligand molecules with a simple method of thermolysing single-source precursor zinc ethylxanthate (Zn(exan) 2 ) with octylamine (OA) or trioctylphosphine (TOP) as precursor solvent. The as-prepared nan…
A new approximate method to calculate exchange-correlation contributions in the framework of first-principles tight-binding molecular dynamics methods has been developed. In the proposed scheme on-site (off-site) exchange-correlation matrix elements are expressed as a one-center (two-center) term plus a {\it correctio…
The effect of $\mathrm{Cu}$-doping at $\mathrm{Mn}$-site on structural, magnetic and transport properties in electron-doped manganites ${\mathrm{La}}_{0.85}{\mathrm{Te}}_{0.15}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Cu}}_{x}{\mathrm{O}}_{3}$ $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.20)$ has been investigated…
A classical variant of the two-dimensional anisotropic Heisenberg model reproducing inelastic neutron scattering experiments on La_5 Ca_9 Cu_24 O_41 [M. Matsuda et al., Phys.Rev. B 68, 060406(R) (2003)] is analysed using mostly Monte Carlo techniques. Phase diagrams with external fields parallel and perpendicular to t…
The phase diagram of the Pb(Mg 1/3 Nb 2/3 )O 3 and PbTiO 3 solid solution (PMN– x PT) depicts a boundary between cubic and rhombohedral phases for x ⩽ 0.32. X-ray powder measurements reported by Dkhil et al show a rhombohedrally split (222) Bragg peak for PMN–10% PT at 80 K that is consistent with this phase boundary.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBi-TTF, Bis-TTF, and Related TTF OligomersMasahiko Iyoda, Masashi Hasegawa, and Yoshihiro MiyakeView Author Information Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan Cite this: Chem. Rev. 2004, 104, 11, 50…
Combining density functional theory calculations for molecular electronic structure with a Green function method for electron transport, we calculate from first principles the molecular conductance of benzene connected to two Au leads through different anchoring atoms -- S, Se, and Te. The relaxed atomic structure of…
We review some aspects of the realistic implementation of the dynamical mean-field method. We extend the techniques introduced in Ref.[A. Georges, G. Kotliar, W. Krauth, and M.J. Rozenberg, Rev. Mod. Phys. 68, 13 (1996)] to include the calculations of transport coefficients. The approach is illustrated on La_{1-x}Sr_x…
We apply first-principles calculations to study the electronic structure of boron nitride nanocones with disclinations of different angles $θ=nπ/3$. Nanocones with odd values of $n$ present antiphase boundaries that cause a reduction of the work function of the nanocones, relative to the bulk BN value, by as much as 2…