Materials Literature
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Deposition of coinage metals on a crystallographic surface of a colloidal crystal is proposed with the aim of fabricating metal surfaces with a regular relief on a scale of 200–300 nm to get strong surface-enhanced Raman scattering (SERS). The approach is implemented through thin gold-film deposition on a surface of a…
By means of molecular dynamics technique, the dynamic process of nucleation and motion of a partial dislocation is carefully investigated in a nanoscopic specimen of single crystalline nickel under [001] tension, The mechanism and mechanics are discussed in a new light of the two successive unstable behaviors of local…
Effects of matrix cracks and the attendant interface debonding and sliding on both the longitudinal and the transverse thermal diffusivities of a unidirectional Nicalon/MAS composite are investigated. The diffusivity measurements are made in situ during tensile testing using a phase‐sensitive photothermal technique. T…
The effect of crosslinking on the molecular dynamics of two triblock copolymers and a random copolymer is investigated and compared. Dynamic-mechanical measurements were done to evaluate both real and imaginary parts (J′, J″) of shear compliance in wide temperature and frequency windows, –95 to 120°C and 10–4 to 10 Hz…
Highly porous polyurethane foams were prepared by the particulate-leaching technique, using NaCl as water-soluble solid phase. Melt compounding and compression moulding were used to prepare polymer/salt composite samples. Foams with controlled porosity, surface/volume ratio and pore dimension distribution were therefo…
We focussed on the following two topics on block copolymers; (i) the Brazovskii effects, effects of thermal fluctuations on phase transition of systems having a short characteristic length L, and (ii) nanofabrication and nanohybrids based on block copolymer nanostructures. We highlight the following two aspects: Block…
Abstract The clay mineral assemblages of the Tithonian and Berriasian sediments (Tera and Oncala Groups) in the eastern part of the Cameros basin are investigated at seven localities. The lowest-grade assemblage, located on the southern border of the basin, contains calcite + quartz + hematite + kaolinite + mixed-laye…
Different materials were considered for high-frequency circuit applications requiring exposure to low Earth orbit (LEO) space environment. The potential candidates were TMM3 which is a ceramic thermoset polymer composite, and RO4003 which is a glass reinforced hydrocarbon/ceramic laminate, both manufactured by Rogers…
Both energy‐filtered electron diffraction and EDS data clearly indicate extraction of amorphous silica from the parent metakaolinite by electron beam heating. Compared with the extracted silica through furnace heating, a larger population with inhomogeneous distribution and higher structural disorder of extracted sili…
Crystal structures of compounds undergoing symmetry-breaking transitions have been investigated by the X-ray single crystal and powder methods. While the phases HoCuAs2 through HoCuAs1.33P0.67 and ErCuAs2 through ErCuAsP retain the tetragonal HfCuSi2 structure (P4/nmm space group), the compounds HoCuAsP through HoCuAs…
A new type of poly(ethylene terephthalate) fibre was developed via a high‐speed spinning technique. The dyeing behaviour of this fibre in supercritical carbon dioxide was compared with that of a fibre produced by conventional methods. At lower temperature and pressure, the high‐speed spun fibre, which had inherently l…
In our study, shape descriptors were calculated for specimens from the diatom genus Asterionella, using the method of arc lengths and tangent angles in Fourier analysis. Asterionella species are character-poor, populations being distinguished mostly by subtle shape differences. Fourier analysis has been used in the pa…
Sicherite, TlAg 2 (As,Sb) 3 S 6 , is a new mineral species from the famous sulfosalt locality at Lengenbach, Binntal, Switzerland. It occurs in small cavities in a dolomitic rock of Triassic age, associated with abundant realgar, and various other sulfosalts, mainly Tl-bearing species such as hutchinsonite, hatchite,…
Teflon® FEP (fluorinated ethylene propylene) surfaces on the Hubble Space Telescope (HST) have experienced significant degradation in mechanical properties during nearly ten years of exposure in the low Earth orbit environment. This paper describes results of mechanical properties testing of Teflon® FEP materials expo…
The crystal structures of two kupletskite [K 2 NaMn 7 Ti 2 Si 8 O 26 (OH) 4 F] polytypes, (1) triclinic, space group P 1, and (2) monoclinic, space group C 2/ c , from nepheline syenite pegmatites of the Lovozero massif, Russia, have been determined. The two structures differ in the slacking sequence of an identical H…
Equations of nonlinear acoustics are derived from the micromechanical representation of a granular medium as a system of elastically interacting particles possessing translational and rotational degrees of freedom. The structure of the equations is invariant with respect to the shape and size of the particles. The cha…
SBN crystals doped with rare-earth metal ions were studied to show that relaxor ferroelectrics had pronounced anomalies, which manifested themselves by the noncoincidence of the trajectories of the first several cycles of dielectric hysteresis loops, the absence of an unambiguous coercive field, and other special feat…
Nylon/polyester (N/P) conjugate fibers are split by alkaline hydrolysis and then finished with an antimicrobial agent, and the effect of splitting and finishing on the absorption/adsorption properties of the microfibers is studied. The split microfiber fabrics vary in weight loss and pore structure depending on the va…
Die Verbindung [N(CH3)3C16H33]4Mo8O26 wurde mit Hilfe einer Templatsynthese in Form plättchenförmiger Einkristalle synthetisiert und röntgenographisch charakterisiert (P1 (Nr. 2); a = 1003.0(4) pm, b = 1123.6(4) pm, c = 2528(1) pm, α = 97.42(3)°, β = 96.09(3)°, γ = 115.76(3)°; Z = 1). [N(CH3)3C16H33]4Mo8O26 ist ein kr…
Abstract A cholesteric texture was induced in the liquid crystal (a mixture of N-(4-ethoxybenzylidene)-4-n-alkylanilines doped with (R)-(+)-1,1′-bi-2-naphthol and racemic chromium tris(3-butyl-2,4-pentanedionate) (Cr(3-Buacac)3) by the irradiation of right circular polarized light (r-CPL) and resulting chiroselective…