Materials Literature
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The present work investigates the use of magnesium hydroxide, produced by magnesia hydration, as a fire retardant in polymers. The hydration was carried out in an autoclave, at temperature of 130°C for 1 hour, and the product was further submitted to cominution in a jet mill. The solids were characterized with regard…
Reactions of gases with an atomically clean silicon surface were examined by ultrahigh-vacuum reflection electron microscopy. The initial stages of interaction of oxygen with the Si(111) surface were studied in the temperature range from 500 to 900°C. Motion of monatomic steps to the upper terraces during etching by o…
The effects of the unit corona-treatment energy on the contact angle of various liquids, on the surface free energy, on the extent of oxidation of a surface layer, and on the adhesion of acrylic adhesive were studied using a biaxially-oriented polypropylene (BOPP) film. The surface free energy was determined with the…
This paper introduces a unified description of metallic polycrystal plasticity based on the individual behaviour of dislocations. It starts at the level of the elementary mechanisms involved in plastic deformations of pure face-centred cubic metals. Every significant step that allows linking an upper scale with the pr…
The stringent safety demands for advanced small pebble bed high-temperature reactors (HTRs) are outlined. Main results of German studies on source term estimation are discussed. Core heatup events are no longer dominant for modern fuel, but fission product transport during water ingress accidents (steam cycle plants)…
The thermostability of lanthanum substituted bismuth titanate, Bi 4- x La x Ti 3 O 12 (BLT), with La-content up to x =0.75 was investigated using differential thermal analysis. Subsequently, BLT and Bi 4 Ti 3 O 12 (BIT) single crystals were grown by a self-flux method. The BLT crystals with two different ranges of La…
Characterizations of Ti-B binary oxide thin films by means of various spectroscopic measurements have shown that Ti-B binary oxide thin films are formed by ultra fine TiO2 nanoparticles. A dramatic decrease in the contact angle of water droplets to 0 degree under ultraviolet (UV) light irradiation and a return to only…
Nanocrystalline β‐SiC with additions of 7 wt% Al 2 O 3 , 2 wt% Y 2 O 3 , and 1 wt% CaO was subjected to tensile deformation to study its microstructural behavior under the dynamic process. The liquid‐phase‐sintered body had a relative density of >97% and an average grain size of 170 nm. Tension tests were conducted…
The production and use of slow recovery “viscoelastic” polyurethane foams have increased rapidly over the past few years. Their unique performance characteristics, which include shape conformance, vibration and sound damping, and energy and shock absorption, make these the foams of choice for many diverse applications…
The Resource Description Framework (RDF) is an infrastructure that enables and promotes the encoding, exchange, and reuse of structured metadata. RDF is an application of XML. It uses XML but impos...
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…