Materials Literature
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We performed measurements of a series of adsorption–desorption isotherms of nitrogen into MCM-41 and SBA-15 mesoporous molecular sieves with different pore sizes in a wide temperature range between a bulk triple point (Tt) and a bulk critical point (Tc). The hysteresis loop shrinks with increasing temperature and even…
Molecular memory devices with semiconducting single-walled carbon nanotubes constituting a channel of 150 nm in length are described. Data storage is achieved by sweeping gate voltages in the range of 3 V, associated with a storage stability of more than 12 days at room temperature. By annealing in air or controlled o…
UNDULATORS AND WIGGLERS Electron Beam Dynamics, L. Farvacque Generalities on the Synchrotron Radiation, P. Elleaume Undulator Radiation, P. Elleaume Bending Magnet and Wiggler Radiation, R.P. Walker Technology of Insertion Devices, J. Chavanne and P. Elleaume Polarizing Undulators and Wigglers, H. Onuki Undulators Wig…
Repetitive bursts of continuous wave plasma polymerization on the minute time scale are found to lead to the deposition of well-defined polymeric nanospheres. This unique mode of film growth is attributed to a high level of monomer replenishment in combination with minimal secondary reaction processes (e.g., fragmenta…
Pr0.9Sr0.1CoO2.99 sample exhibits magnetoresistivity (MR) of up to 40 % at 5 K with a strong hysteresis/memory effect. Magnetisation measurements on Pr0.9Sr0.1CoO2.99 in an applied field of 100 Oe show that, as temperature decreases, the zero-field-cooled (ZFC) and field-cooled (FC) magnetisation curves branch clearly…
A general spin-state model and a qualitative physical picture have been proposed for a class of lately synthesized layered cobalt oxides (LCOs) by means of density functional calculations. As the plane corrugation of the cobalt-oxygen layer decreases, the LCOs evolve from a high-spin (HS) superexchange-coupled antifer…
The electroluminescence (EL) properties of Er-doped Si nanoclusters (NC) embedded in metal–oxide–semiconductor devices are investigated. Due to the presence of Si NC dispersed in the SiO2 matrix, an efficient carrier injection occurs and Er is excited, producing an intense 1.54 μm room temperature EL. The EL propertie…
At the Hamburger Synchrotronstrahlungslabor Hasylab most experiments are controlled by the online program Spectra, which runs on Linux PCs. Spectra has been converted into a Perl module, allowing online programmers to write their code in Perl. They can take advantage of complex data structures, flow control, subroutin…
Quinoxaline-bridged porphyrinoids (3), the first macrocycles containing dipyrrolylquinoxaline (DPQ, 1) subunits, were synthesized from the condensation of the diformyl-substituted DPQ derivatives (2) and 1,8-diaminoanthracene. The resulting structures were confirmed by X-ray analyses, which showed encapsulation of CHC…
The electronic structure and chemical bonding of B5− and B5 were investigated using anion photoelectron spectroscopy and ab initio calculations. Vibrationally resolved photoelectron spectra were obtained for B5− and were compared to theoretical calculations performed at various levels of theory. Extensive searches wer…
Polychrome silver nanoparticles have been prepared by a soft solution approach under microwave irradiation from a solution of silver nitrate (AgNO3) in the presence of poly(N-vinyl-2-pyrrolidone) without any other reducing agent. Different morphologies of silver colloids with charming colors could be obtained using di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced Motions in Azo-Containing PolymersAlmeria Natansohn and Paul RochonView Author Information Department of Chemistry, Queen's University, Kingston, Ontario, K7L 3N6, Canada Department of Physics, Royal Military College, Kingston, Ontario, K7K 5L0, Canada Cite this…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPhase Behavior of Binary Blends of Chemically Different, Symmetric Diblock CopolymersChristine M. Papadakis, Peter Busch, Roland Weidisch, Helmut Eckerlebe, and Dorthe PosseltView Author Information Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnéstrasse 5,…
Elliptically shaped (Pb1–xCdx)S nanoparticles (NPs) of average size 2.3 × 2.9 nm (minor axis × major axis) have been prepared via reaction of a solid [oligo(p-phenylene-ethynylene) dicarboxylate]Pb0.9Cd0.1 salt matrix, with gaseous H2S. A significantly long emission lifetime, with multi-exponential behavior, is detect…
Die vierkernigen Peroxo-Komplexe [Ln4(O2)2Cl8(Py)10]·Py mit Ln = Sm (1·Py), Eu (2·Py) und Gd (3·Py) entstehen als blaßgelbe (1·Py) und farblose (2·Py und 3·Py) Kristalle durch Einwirkung von Luftsauerstoff auf zuvor erhitzte Lösungen der wasserfreien Trichloride LnCl3 in Pyridin/Diacetonalkohol (4-Hydroxy-4-methyl-2-p…
Abstract Cationic dyeable poly(ethylene terephthalate) (CD‐PET) was formed by copolymerizing dimethylterephthalate (DMT),5‐sodium sulfonate dimethyl isophthalate (SIPM) with a molar ratio of 2% and ethylene glycol (EG). Blends of regular poly(ethylene terephthalate) (PET) and CD‐PET were spun into hollow fibers. The f…
1H Magic Angle Spinning (MAS) NMR and 1H T1 and T1ρ relaxation times measurements were used to investigate structural aspects of gel derived glasses of composition 10P2O5·90SiO2 (10P) and 30P2O5·70SiO2 (30P), with the aim of understanding the different humidity sensitive behaviour observed for films of the same compos…
Molecular dynamics simulations have been made of a collapsing bubble or cavity in a simple liquid. Simulations of a Lennard-Jones liquid reveal that the collapsing process takes place in a series of stages. First, the ‘hottest’ molecules from the high kinetic energy tail in the Maxwell—Boltzmann distribution diffuse i…
Abstract A series of aqueous polyurethane dispersions containing pendant carboxylate anion as the hydrophilic were synthesized, and the particle size and the mechanical properties of the dispersions were measured. The effects of the molar ratio of NCO/OH groups or the other functional groups on the chemical structure…
Gold nanoparticles were prepared in an aqueous solution and a 50:50 N -methyl-2-pyrrolidone (NMPD)/toluene mixed solvent using o -anisidine as the reducing agent, respectively. The reaction is conducted by choice of the temperature and medium. Transmission electron microscopy (TEM) and UV−vis absorption spectroscopy m…