Materials Literature
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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…
A method to prepare a new class of helicene-fused phthalocyanine derivatives is outlined. These derivatives self-assemble into unique rod-like features, with a narrow length distribution of 750-850 nm and a uniform width of 95 ± 10 nm .
Abstract Sulfur vulcanization was carried out with 5-phenyl hex-2-ene serving as a model of e-SBR. Various accelerators have been used to study and compare the reactivity in a system containing sulfur and activators. Both HPLC and GC-MS analytical tools were used to identify the reaction products. It has been observed…
Odd–even behavior for the emergence of ferroelectricity and antiferroelectricity has been examined in bent-core compounds containing two different chain lengths; i.e., 1:1 mixtures of neighboring homologues of symmetric bent-core mesogens and nonsymmetric pure compounds. The odd–even behavior was found to be very stri…
Specific features of electrode behavior of synthetic diamond and diamond-based materials (in particular, diamond-nondiamond carbon nanocomposites, nanocrystalline diamond, and diamond-like carbon) are reviewed. Effects of the crystal structure and semiconductor nature of diamond on its electrochemical properties are d…
Novel gold nanoparticles, passivated by monolayers of benzenethiol, biphenylthiol, and similar derivatives, have been synthesized and characterized using UV/vis, NMR, and Fourier transform infrared (FTIR) spectroscopies. The nanoparticle sizes have been evaluated using transmission electron microscopy and UV/vis spect…
A new class of linear unsaturated polyarylphosphate esters based on dibenzylidene cyclopentanone, possessing liquid crystalline‐cum‐photocrosslinkable properties has been synthesized from 2,5‐bis(m‐hydroxyalkyloxybenzylidene)cyclopentanone (m = 6,8,10) with various aryl phosphorodichloridates (aryl = phenyl, naphthyl,…
In situ and ex‐situ atomic force microscopy (AFM) studies of annealing of solution‐grown single crystals of polyethylene (PE) on graphite were performed at temperatures up to 170°C. Structural changes of the crystals began at ∼90°C at the interface between the lamellar crystal and the substrate where solvent traces ar…
The effect of initial synthesis solution pH and tetramethylammonium silicate concentration in the synthesis solution on the physical and chemical properties of MCM-41 was systematically investigated using N(2) physisorption, X-ray diffraction, temperature-programmed reduction, in situ Fourier transform IR, UV-vis, and…
The corrosion behaviour of Nd–Fe–B, a permanent magnetic alloy, has been studied in two different solutions chosen to simulate the effects of marine and industrial environments. The results showed that the corrosion rate of the alloy was about nine times higher in the simulated industrial (sulphate) environment when c…
Abstract Cellular biological materials have intricate interior structures, self‐organised in hierarchies to produce modularity, redundancy and differentiation. As Michael Weinstock explains, the foam geometries of cellular materials offer open and ductile structural systems that are strong and permeable, making them a…
Este trabalho avalia a viabilidade técnica da obtenção de compósitos lignocelulósicos de PVC, utilizando-se resíduo de Pinus elliottii e Pinus taeda como carga reforçativa. Foi desenvolvido um processo simples e economicamente viável de tratamento de resíduos industriais desta madeira, processo este baseado na secagem…