Materials Literature
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The synthesis, solid-state and solution structure of a magnesium amine bis(phenolate) complex [Mg{(O-2,4-t Bu2 C6 H2 -6-CH2 N(Me)CH2 }2 (C6 H5 CH3 )1.5 ]2 4-Mg is reported. The complex was prepared by combining MgBu2 with an equimolar amount of the p
Metal foams are quite a challenge to materials scientists due to their difficult manufacturing. In all processes the foam develops in the liquid or semiliquid state. Liquid-metal foams are complex fluids which contain liquid metals, solid particles and gas bubbles at the same time. An X-ray transparent furnace was dev…
Abstract A solid state synthesis of calcium manganite (CaMnO 3 ) is described where equimolecular mixtures CaCO 3 :MnCO 3 have been subjected to mechanical stress (high energy milling) so yielding CaCO 3 -MnCO 3 solid solutions of nanometric particle size. TG measurements have shown that a link exists between milling…
Thermometric properties of the capacitance temperature sensor with polycrystalline (Sr1−x Cax)TiO3 (x = 0.05) have been investigated at cryogenic temperatures. Ferroelectric state appeared at 31.8 K due to Ca doping. Temperature sensitivity S and dimensionless temperature sensitivity Sd at 2.5 K were 90 pF/K and 0.045…
Abstract The purpose of this lecture is to review the main achievements of the investigations of II–VI compounds and point out Polish contributions to this part of solid state physics. Because the Polish physicists were particularly active in the area of narrow gap semiconductors as well as in the area of semimagnetic…
Abstract Summary: In current work time‐resolved optical spectroscopy (TROS) has been used to study coil‐globule transitions monitored by the local segmental dynamics of anthracene labeled poly ( N ‐isopropymethacrylamide), PNIPMAM as a function of pressure (0.1 MPa–200 MPa) over a temperature range of 283 K to 333 K.…
Nylon 66 nanocomposites with different smectite clay loadings were prepared by conventional melt compounding process. The fracture toughness decreases with increasing clay content, which is a direct result of reduced plastic zone size at the crack tip region. The fracture mechanisms were studied using double-notched f…
Abstract Summary: The purpose of this study was to formulate the new combined system of acrylic and citric acids, which was prepared by free radical polymerization and esterification reaction at the same time to form citric‐acrylate CAC oligomer. The presumable chemical structure of this oligomer and the reaction mech…
A two-dimensional model of quasi-free-electrons is used to compute the electron axial distribution on a carbon nanotube and the energy distribution of the field emitted electrons. The nature of the substrate-nanotube contact is taken into account by varying the boundary condition for the electronic wave function. In q…
Effect of hydrogen radiofrequency plasma and chemical treatment on photoluminescence (PL) spectra of SiO x layers containing Si nanoparticles are investigated. Considerable PL intensity growth in the samples containing Si nanocrystals (nc-Si-SiO x ) after plasma treatment is observed. The process saturates for time of…
Crystallographic structures of two new orthophosphates Ca 0.50 SbFe(PO 4 ) 3 and CaSb 0.50 Fe 1.50 (PO 4 ) 3 obtained by conventional solid state reaction techniques at 900 °C, were determined at room temperature from X-ray powder diffraction using Rietveld analysis. The two compounds belong to the Nasicon structural…
We describe two state-of-the-art ultrasonic interferometers designed for pulse-echo ultrasound measurements in the short-pulse (40 ms) and intermediate-pulse (400 ms) 60 T magnets of the National High Magnetic Field Laboratory facilities at Los Alamos, NM. One interferometer utilizes a more commonly used scheme which…
A series of ABS plastics prepared by bulk polymerization was studied. The test samples contained almost equal amounts of PB but mostly differed in the molecular mass of a styrene-acrylonitrile copolymer. It was shown that the molecular mass of the copolymer strongly affects the rheological and mechanical properties of…
Valence-band type Auger lines in Al doped and undoped ZnO were comparatively studied with the corresponding core level x-ray photoelectron spectrography (XPS) spectra as references. Then the shift trend of energy levels in the valence band was that p and p-s-d states move upwards but e and p-d states downwards with in…
The fluorescence spectra of the nematic liquid crystal n -pentyl- n ′-cyanobiphenyl (5CB) in porous glasses with pores from 1 to 44 nm in diameter are investigated. A decrease in the pore diameter leads to suppression of some long-wavelength spectral components corresponding to H -type predimer and dimer pairs (the mo…
Well-aligned crystalline carbon nanotubes (CNTs) were synthesized on anodic aluminum oxide (AAO) template using low-pressure thermal chemical vapor deposition (TCVD). The AAO templates were fabricated using an anodization process, and Fe as a catalyst was electrochemically deposited inside the bottom of the pores on t…
Abstract First‐ and second‐generation polyphenylene dendrimers were synthesized starting from benzophenone as core. Variation of the size and the density of the dendrimer shell resulted in different isolation of the cores. To investigate the effect of shielding upon the reactivity of the core, chemical functionalizati…
A mathematical crystallization model in the meso scale (the intermediate dimension scale between interatomic distance in solids and grain size in metals and alloys) is presented with the use of a kinetic-diffusion cellular automaton model. The model considers the non-equilibrium character of real processes of phase tr…
We introduce a method for the determination of the optical retardation, its wavelength dispersion, the cell twist angle, and the orientation of the input director in a reflective liquid crystal (LC) cell. These parameters are found from the extremes of a characteristic function defined as a sum of two spectral reflect…
If colloidal particles are grafted with a polymer, then the grafted chains can provide steric repulsion between them. If some of the grafted polymer chains are also adsorbed to a second particle, then a bridging force is generated as well. For uncharged plates and polymer, the following contributions to the free energ…