Materials Literature
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Many crystalline materials show chemical short range order and relaxation of neighboring atoms. Local structural information can be obtained by analyzing the atomic pair distribution function (PDF) obtained from powder diffraction data. In this paper, we present the successful extraction of chemical short range order…
It has been shown that under joint action of DC magnetic and AC electric fields neutral particles (atoms,molecules,nano-size particles etc.) nearby interface move with permanent velocity along the surface. The driving force depends on non-linear dynamical properties of polarization of the particles and a coupling betw…
We present results of molecular-dynamics simulations for a nonentangled polymer melt confined between two completely smooth and repulsive walls, interacting with inner particles via the potential U(wall)=(sigma/z)(9), where z=/z(particle)-z(wall) and sigma is (roughly) the monomer diameter. The influence of this confi…
Thermal treatment of Zn(NH3)(4)2+ precursor in ethanol solvent led to the formation of the tubular ZnO which exhibited strong ultraviolet photoluminescence around 385 nm at room temperature; TEM images showed the hollow tubules with approximately 450 nm in diameter and approximately 4 microns in length were built up b…
Adsorption in spherical cavities is studied by the nonlocal density functional theory (NLDFT). Theoretical results are compared with experimental data on ordered nanoporous materials with cubic Pm 3 n (SBA-1, HMM-3), cubic Im 3 m (SBA-16), and 3D hexagonal P 6 3 / mmc (SBA-2, SBA-12) cagelike structures. Quantitative…
The low-temperature alloying of Fe-Ag nanoparticles entrapped within thermally evaporated fatty acid films by a novel ion exchange technique is described. Nanoparticles of iron and silver were grown in thermally evaporated stearic acid (StA) films by sequential immersion of the film in solutions containing Fe 2+ ions…
This is a report on the construction and the main features of an X-ray camera following the Debye–Scherrer geometry, combined with a sample mounting and rotation device for single crystals as first suggested by Gandolfi. Doubling of the camera radius and replacing of the wet-film technology by a highly dynamic imaging…
The molecular orientation in as-spun fibers of main-chain thermotropic liquid crystalline polymers (TLCP) has been investigated using electron diffraction at high spatial resolution. Although a large degree of macromolecular alignment with the fiber axis is expected due to the large shear stress and elongational flow…
Femtosecond transient absorption studies were conducted for self-assemblies between oppositely charged metal-substituted 18-crown-6 tetrasubstituted phthalocyanines (McrPc) and metal-substituted meso -(4-sulfophenyl)-porphine (MTPPS) or meso -(4-carboxylphenyl)-porphine (MTPPC). Excitation could be carried out at 400…
The circumstances leading to the present worldwide explosion of interest in molecule–based magnetic materials are summarized. Interactions between developments in inorganic coordination and solid–state chemistry with developments in condensed–matter physics are identified as key factors in the emergence of this new fi…
The interaction of oxygen with nickel deposited on polycrystalline aluminum surfaces has been investigated using Auger electron spectroscopy, X-ray photoelectron spectroscopy, and angle-resolved X-ray photoelectron spectroscopy. The growth of the nickel on the aluminum surfaces occurs in two stages: formation of NiAl…
Relaxation processes of the concentration fluctuations induced by a rapid pressure change were investigated for a dynamically asymmetric polymer blend [deuterated polybutadiene (DPB)/polyisoprene (PI)] with a composition of 50-50 by weight by using time-resolved small-angle neutron scattering. The pressure change was…
The formation and spectroscopic properties of several metalloporphyrin−metallophthalocyanine complexes have been investigated. The complexes consist of negatively charged tetrasulfonatophenyl or tetracarboxyphenyl porphyrins in ion pairs with positively charged crown ether substituted metallophthalocyanines. The posit…
Orientation dynamics of the glass forming liquid, dibutylphthalate (DBP), were studied using optical heterodyne detected optical Kerr effect (OHD-OKE) techniques. A combination of experimental methods permitted acquisition of data over 6 decades of time and 5 decades in signal amplitude. Data collected from several hu…
The geometries and harmonic vibrational frequencies of several possible intermediates involved in the NO decomposition mechanism catalyzed by Cu−ZSM5: ZCu(NO 2 )(NO), ZCu(N 2 O 3 ), ZCu(N 2 O)(O 2 ), ZCu(N 2 O), and ZCu(O 2 ), have been determined using the B3LYP density functional approach and a tritetrahedral model…
A procedure is presented for experiments on naked unfrozen protein crystals with the crystal mounted in a conventional cryo-loop and surrounded by a stream of a wet gas. The composition and temperature of the vapour stream can be adjusted to keep the crystal without deterioration for many hours. The arrangement allows…
We present quasielastic light scattering and dielectric spectra of the glass former alpha-picoline. At high temperatures the evolution of the susceptibility minimum is well described by the mode coupling theory (MCT). Below the critical temperature T(c) the simple scaling laws of MCT fail due to the appearance of the…
Sandwich structured (Bi, La) 4 Ti 3 O 12 /Pb(Zr, Ti)O 3 /(Bi, La) 4 Ti 3 O 12 thin films were fabricated on Pt/Ti/SiO 2 /Si substrates, with the intention of simultaneously utilizing the advantages of both (Bi, La) 4 Ti 3 O 12 (BLT) and Pb(Zr, Ti)O 3 (PZT) thin films such as non-fatigue behaviours of BLT and good ferr…
This paper concerns the effect of changes in experimental conditions on the micrometric-scale organization observed in hybrid materials obtained from six rigid rod and semi-rigid bis-trialcoxsilylated precursors and one trisilylate after polycondensation at silicon. Different solvents and catalysts have been studied s…
The phase-separation dynamics of a ternary mixture (A, B and C) coupled with a reversible chemical reaction between the two constituents A and B is presented. It is demonstrated that the free-energy functional form of time-dependent-Ginzburg-Landau equation describing the phase-separation dynamics of the ternary mixtu…