Materials Literature
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Optical absorption spectra of InSe and InSe:Er single crystals were investigated just below and in the excitonic resonance energy region. The temperature dependence of the free exciton transition associated with the direct gap of InSe and InSe:Er were measured in the temperature range 10< T <340 K. The parameters desc…
Impulse breakdown of a point/plane gap in mixtures of SF 6 with selected buffer gases (air, CO 2 and N 2 ) has been studied. It has been found that the minimum impulse breakdown voltage of these SF 6 mixtures can be higher than or comparable with that of pure SF 6 . This finding is discussed in terms of the change of…
Chromium oxide pillared manganese oxide materials were prepared by intercalating layered manganese oxide with chromium hydroxyl acetate clusters under reflux condition. The as-synthesized materials were heated at 200 °C in flowing nitrogen for 1 h to result in chromium oxide pillared manganese oxides. X-ray diffractio…
Block copolymers consisting of two or three different polymer chains linked by covalent bonds form intricate domain structures that can be exploited in applications ranging from gas separation to optical communication. Recently, previously predicted gyroid structures, which consist of three or five separate three-dime…
Lanthanide(III) complexes have been prepared with [L 1 ] - [the tetradentate chelating ligand bis{3-(2-pyridyl)pyrazolyl}dihydroborate], [L 2 ] - [the tetradentate chelating ligand bis{3-(2-pyrazinyl)pyrazolyl}dihydroborate], [L 3 ] - [the hexadentate chelating ligand bis[3-{6‘-(2,2‘-bipyridyl)}pyrazol-1-yl]dihydrobor…
We offer an alternative explanation of the breakdown of Debye−Stokes−Einstein and Stokes−Einstein relations observed as enhanced translational diffusion compared with rotational diffusion of probe molecules in supercooled liquids and polymers close to the glass transition temperature. By showing that the breakdowns of…
A systematic investigation into the effects of deposition conditions on the electrochemical properties and nanostructure of high surface area (up to ∼460 m 2 cm - 3 ) mesoporous platinum films (H I -ePt) obtained by electroreduction of hexachloroplatinic acid (HCPA) from an hexagonal lyotropic liquid crystalline phase…
The photochemistry of the (7-methoxycoumarin-4-yl)methyl (MCM) carboxylates 3a − d, the mesylate 4, and the phosphates 5a − e has been examined under near physiological conditions in acetonitrile or methanol/aqueous HEPES buffer solution, respectively. Analysis of photoproducts as well as measurements of photochemical…
Models are presented which show that, for WDM systems, XPM and FWM in EDFAs can be far larger for tellurite than for silica (tens of dB larger for FWM), because tellurite is highly nonlinear. Experimental results for XPM are presented.
In this work we present the results of molecular dynamics simulations of polypropylene melts of different tacticities, based on a recently published molecular model. Volumetric properties of isotactic, syndiotactic, and atactic polypropylene exhibit no significant differences and are in good agreement with experimenta…
Kinetic aspects of the synthesis of (2-methacryloxy)ethyloxy functionalized poly( l -lactide) macromonomers using aluminum mono- and trialkoxides carrying this functionality are presented. The results show the living character of the ring-opening polymerization independently of the reaction temperature, but there are…
"The book focuses on structural and property characterization of nanocrystals and their assemblies, with an emphasis on basic physical approach, detailed techniques, data interpretation and applications." "Intended as a comprehensive reference work for postgraduate students and researchers in the field who are special…
We introduce a new colloidal probe technique to study local and long range motions of semiflexible actin filaments along their reptation tube axis in entangled networks. Single test filaments decorated with colloidal gold and latex beads are embedded in semidilute actin networks. The chain diffusive motion is explored…
A neutron diffraction study of four rare-earth phosphate glasses of composition (R 2 O 3 ) x (P 2 O 5 ) 1- x , where x = 0.197, 0.235, 0.187, 0.263 and R = Ce, Ce, Nd, Tb respectively is presented. The structures of these materials were investigated as a function of (a) rare-earth atomic number and (b) composition. Th…
For s-polypropylene, three different s-poly(propene- co -octene)s, two poly(ethylene- co -octene)s and poly( -caprolactone) we determined the relationships between the crystallization temperature T c , the crystal thickness d c and the melting peak temperature T f by carrying out time- and temperature-dependent small-…
The manganates La 0.80 Ca 0.20 MnO 3 , La 0.70 Ca 0.30 MnO 3 and La 0.70 Sr 0.30 MnO 3 exhibit the colossal magnetoresistive (CMR) effect. Total neutron diffraction was employed to yield information on both the average and local atomic structure of these disordered crystalline materials as a function of temperature. T…
We quantify the relationship between the atomic structures of the amorphous and the ordered and disordered crystalline phases of silica using neutron total scattering measurements to determine the local atomic configurations. The instantaneous local atomic arrangements of HP-tridymite and -cristobalite, both dynamical…
Grand canonical Monte Carlo molecular simulations have been carried out for adsorption of nitrogen at 77 K on square arrays of open and closed single-wall carbon nanotubes with diameters of 6−30 Å and nanotube separations of 4−30 Å. Exohedral spaces for arrays of closed nanotubes with small tube separations are microp…
The samarium(II) aryloxide complexes Sm(OAr) 2 (THF) 3 and [(C 5 Me 5 )Sm(μ-OAr)] 2 (Ar = C 6 H 2 t Bu 2 -2,6-Me-4) showed an extremely high activity for the ring-opening polymerization of ε-caprolactone (CL) and δ-valerolactone (VL). By using Sm(OAr) 2 (THF) 3 as an initiator, polyesters with very high molecular weig…
Six disaccharide amphiphiles were synthesized and their hydrogel-forming behavior was extensively studied. These amphiphiles were based on maltose and lactose. Since the gels formed from some of these systems showed the ability to “trap” water molecules upon gelation, these gels were described as “hydrogels”. When the…