Materials Literature
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Three photosensitive cholesteric liquid crystal mixtures have been investigated as UV sensors. Each of them is sensitive to a well definite part of the solar UV radiation spectrum, the UV A or the UV B or the UV C range, with suitable absorption spectra. The photosensitive elements in the mixtures are either photoisom…
We investigated the etching behaviors of GST, which has been mainly employed for the realization of phase-change type nonvolatile memory devices, using high-density helicon plasma etching system under the various etching gas conditions. Our results provide the etch rates of GST thin films as a function of gas mixing r…
The design and synthesis of new biomaterials, particularly those derived from biomolecule-based monomers, remains an area of considerable research effort. Herein the synthesis and characterization of poly(carbonate-acetal)s based on stabilized dimer forms of the glucolytic metabolite, dihydroxyacetone, are reported. T…
Abstract We report surface‐enhanced hyper Raman scattering (SEHRS) from molecules in silver colloidal solutions using high repetition rate mode‐locked picosecond excitation at 1064 nm. SEHRS was is studied under non‐resonant and resonant conditions by choosing adenine and crystal violet as test molecules. Compared wit…
Abstract Nanoscaled materials of organic dyes are of interest for a variety of potential applications because of the rich photonic properties that this class of molecules can impart. One mode to form such nanoscaled materials is via self‐organization and self‐assembly, using reasonably well understood methods in supra…
X-ray diffraction analysis, Auger electron spectroscopy, X-ray photoelectron spectrometry, optical micrography, and spot potential measurements have been used to characterise AISI 316L stainless steel specimens with oxide films formed by heating in air, either isothermally (at 200–1000°C) or in a temperature gradient.…
Results are presented on the effectiveness of treating archaeological iron by immersion in an aqueous sodium hydroxide (NaOH) solution (2% w/v, pH 13.5, room temperature) followed by immersion in an aqueous 1,2-diaminoethane (ethylenediamine, EN) solution (5% v/v, pH 11.5, 50°C). This study was undertaken to determine…
A band structure of barium titanate crystal has been calculated with the WIEN2k program, using FP LAPW method. A broad dispersion of the valence band (about 5 eV) and a narrow forbidden energy gap (about 2 eV) confirm the crucial role of covalent interactions in this compound. The calculations have been performed for…
Pore volume, pore diameter, pore volume distribution and pore throat diameters of nanofiber mats were measured using mercury intrusion porosimetry, liquid extrusion porosimetry and capillary flow porometry. Analysis of results showed that mercury intrusion distorts the structure due to application of high pressure. Li…
The synthesis, spectroscopic characterization and electrochemistry of four Mn(III) and Mn(IV) octaethylcorroles are reported and the potentials of the Mn(III) / Mn(IV) and Mn(IV) / Mn(III) processes examined as a function of the axial ligand. The investigated compounds are represented as ( OEC ) Mn , ( OEC ) MnCl , (…
The localized corrosion behavior of a Cu-free 6111-like alloy was studied in solutions with different chloride concentrations. It was found that the alloy was susceptible to pitting and intergranular corrosion (IGC). The IGC attack on the alloy was less conspicuous unless the pits were cross sectioned. The pitting att…
The background intensity of X-ray diffraction patterns is analysed in terms of point defects, especially vacancies, in poly- and single-crystalline copper specimens. The samples have been deformed by compression in-situ in a synchrotron peak profile experiment. Systematic comparative analysis of X-ray, electrical resi…
This paper describes the results of experiments and simulations made to examine the waveform of leakage current flowing through the surface of HTV (high temperature vulcanized) silicone rubber specimen exposed to clean fog. Water droplets were placed on the surface of specimen energized with AC voltage and investigati…
Luminescence experiments have been used to probe the nature of trapping sites and the dynamic behavior of charge carriers in low density polyethylene (LDPE), antioxidant containing LDPE (LDPE+AO) and cross-linked polyethylene (XLPE). It is shown that deep traps of different natures are present in these materials. For…
The thermotropic polymorphism of a series of guanidinium alkanesulfonates (6 < or = n < or = 18) was investigated by optical microscopy and differential scanning calorimetry. Hydrogen bonding was analyzed by infrared spectroscopy. Molecular volumes were measured by dilatometry. The structure of the crystal, smectic A,…
Corrosion affects both fixed and mobile marine installations and equipment made from two basic engineering materials: steel and reinforced concrete. Typical cases of corrosion appear in the retaining walls of marine ports and in the floating docks of shipyards. This situation has been aggravated in recent decades by t…
The relentless increase in the thermal loads imposed on devices and materials structures is driving renewed interest among materials scientists and engineers in the area of thermal transport. Applications include thermal barrier coatings on turbine blades, thermoelectric coolers, high-performance thermal transfer liqu…
La rouxelite, Cu 2 HgPb 2 2 Sb 2 8 S 6 4 (O,S)2, est une nouvelle espece de sulfosel decouverte dans le gisement a Fe-Ba de Buca della Vena (Alpes Apuanes, Italie). Elle se presente en cristaux aciculaires a eclat metallique dans des veines de calcite. Reflectance dans l'air (R%, λ en nm): 38.2 (470), 36.2 (546), 35.4…
Abstract The fracture behavior of unirradiated Zircaloy-4 containing either solid hydride blisters or hydrided rims has been examined for the contrasting conditions of equal-biaxial and plane-strain tensile deformation at three temperatures (25°, 300°, and 375°C). Cold-worked and stress-relieved Zircaloy-4 sheet conta…
The purpose of this study was to prepare protein-coated potato chips and evaluate type of proteins and storage time on the quality of final product. Potato slices were prepared, blanched, immersed in solutions of sodium caseinate, whey proteins concentrate (WPC), or egg white and deep-fried in a mixture of corn oil an…