Materials Literature
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The polarized Raman spectra of orthorhombic RMnO3 series (R=La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Y) were studied at room temperature. The variation of phonon frequencies with R ionic radius rR as a whole confirms the commonly accepted Raman line assignments with two noticeable exceptions: (1) with decreasing rR the stretching A…
Considerable effort has been expended on theoretical studies of superhydrophobic surfaces with two-tier (micro and nano) roughness, but experimental studies are few due to the difficulties in fabricating such surfaces in a controllable way. The objective of this work is to experimentally study the wetting and hydropho…
A small number of isolated Au3+ ions (0.02 Au3+/nm2) heterogenized on a zirconia surface from a cheap inorganic source (HAuCl4) is able to grant high catalytic activity for the selective hydrogenation of 1,3-butadiene (see picture). The catalytic turnover and mass activity rates of the Au3+ ions are respectively one a…
Freely suspended metallic single-walled carbon nanotubes (SWNTs) exhibit reduced current carrying ability compared to those lying on substrates, and striking negative differential conductance at low electric fields. Theoretical analysis reveals significant self-heating effects including electron scattering by hot none…
The current intense interest in the properties of plasmonic nanostructures for their applications in chemical and biochemical sensors, medical diagnostics and therapeutics, and biological imaging is fundamentally based on their enhanced optical absorption and scattering properties. In this study, the optical extinctio…
Intellectually, the advantages that flow from the availability of single-site heterogeneous catalysts (SSHC) are many. They facilitate the determination of the kinetics and mechanism of catalytic turnover-both experimentally and computationally-and make accessible the energetics of various intermediates (including sho…
Significant enhancement of the mechanical properties in PS/EVA blends is achieved via sc CO 2 exposure in the pressure/temperature domain where the amplitude of the density fluctuations is maximal. Before exposure, bulk samples of the blends elongate an average of 134% under uniaxial tension, whereas the average elong…
In the present study the characterization and distillation of alkyd paint waste have been carried out in order to establish the technical viability of organic solvents recovery and to decide upon the best environmental management for the waste stream from a paint spray-booth application in an automotive component fact…
The low-temperature martensitic phase transformation in Fe71Ni29 was studied by X-ray diffractometry, differential scanning calorimetry (DSC) and inelastic neutron scattering. From inelastic neutron scattering spectra, the phonon density of states of the high-temperature austenite and low-temperature martensite were o…
Highly ordered La0.62Pb0.38MnO3 nanowire arrays are successfully fabricated using an improved sol–gel template method. The x-ray diffraction and transmission electron microcopy results reveal that the nanowires are polycrystalline with uniform diameter around 50 nm. Magnetic measurement indicates that the ferromagneti…
Slip systems in indented natural single crystal scheelite were studied using TEM. Indentations with loads from 10 to 200 g were applied on (001), (100), (110), and (112) crystallographic planes at room temperature. Focused Ion Beam (FIB) technique was used to machine electron-transparent foils with pre-defined orienta…
Large-scale, uniform and regular oxide/sulfide core–shell nanostructures and nonlayered sulfide nanotubes, such as ZnO/ZnS, SnO 2 / SnS 2 , MnO 2 / MnS 2 core–shell nanostructures, as well as ZnS and SnS 2 nanotubes, have been prepared by a versatile approach based on a thioglycolic acid assisted hydrothermal process…
In this paper we present a theoretical study of the observed IR spectra of some samples of amber. We compare them to theoretically obtained spectra for a model of this natural polymer. The model assumes that communic acid and communol are plausible precursors in the natural polymerization of amber. We employ an electr…
We study the liquid-vapor phase behavior of a polydisperse fluid using grand canonical simulations and moment free energy calculations. The strongly nonlinear variation of the fractional volume of liquid across the coexistence region prevents naive extrapolation from detecting the cloud point. We describe a finite-siz…
Mechanical heart valves are exposed to extreme mechanical demands, which require a surface showing not only nonhaemostatic properties, but also wear resistance and low friction. As alternative to different forms of amorphous carbon (a-C), so-called diamond-like carbon (DLC), the suitability of boron carbonitride (BCN)…
We propose a systematic coarse-grained representation of block copolymers, whereby each block is reduced to a single ‘soft blob’ and effective intra- as well as intermolecular interactions act between centres of mass of the blocks. The coarse-graining approach is applied to simple athermal lattice models of symmetric…
The high temperature deformation behavior of Mg single crystals was precisely investigated using orientation imaging microscopy. For this purpose, Mg single crystals of various orientations were tensile tested in vacuum at temperatures between 473 and 673 K. A strain rate of 4.2 × 10−4 s−1 was employed. The elongation…
Abstract A novel thermoresponsive shell crosslinked three‐layer onion‐like polymer particles were prepared using hyperbranched polyglycerol (PG) as parents compound, the periphery hydroxyl groups of PG were transformed into trithiocarbonates (SC(S)S) first; then, it was used as chain transfer agent to prepare star‐l…
A series of homo- and copolymers containing different photochromic dithienylethene (DTE) architectures was prepared by ring-opening metathesis polymerization (ROMP) techniques. Each DTE structure can be uniquely addressed in the two- and three-component copolymers, providing a means to generate a wide range of colors…
Through elastic neutron scattering we investigated the fast dynamics of lysozyme in hydrated powder form or embedded in glycerol-water and glucose-water matrices. We calculated the relaxational contribution to the mean square displacements of protein hydrogen atoms. We found that the inverse of this quantity is linear…