Materials Literature
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Heavy metal fluoride glass ZBLAN, with molar composition ZrF4(53)–BaF2(20)–LaF3(4)–AlF3(3)–NaF(20), was studied in vacuum at high temperatures up to 480°C by Raman spectroscopy. The vitreous glass was found to crystallize at 330°C, most probably to β-BaZrF6 crystallites. High-temperature experiments in air were also c…
Dense mullite coatings have been deposited on SiC and Si3N4 substrates by chemical vapor deposition (CVD). The coatings were compositionally graded with the Al/Si ratio increasing from 1.5 at the substrate/coating interface, to a value of 8 at the coating surface. This gradation of composition is discussed in light of…
Abstract Volatile species are removed from polymers by devolatilization. Foaming experiments using corn syrup and low‐density polyethylene were carried out to investigate effects of volatile content, operating vacuum level and stripping agent in devolatilization. When foaming and rupture occur, a limiting foam volume…
A new fabrication technology for producing hypertextured aluminum-copper (Al–Cu) films has been developed. The key feature of this technology is the argon (Ar) plasma treatment of the titanium (Ti) underlayer. The full width at half-maximum values of the Al (111) rocking curve decrease with increasing Ti etched thickn…
The effects of adding different amounts of vanadium (0.02–0.54%) to ductile irons have been investigated. Optical microscopy revealed that that the addition of vanadium led to the formation of a phase with a particle size of up to 6 μm in the as-cast microstructure and SEM—EDX microanalysis showed that this phase is v…
The C 1s, F 1s, and O 1s components of the x-ray photoelectron spectroscopy spectrum of Teflon AF 1600 have been obtained, and their constituent peaks were separated and attributed. The effect of an intervening carbon atom on the F 1s spectrum has been shown to decrease the inductive effect of a next-nearest neighbor…
The magnetic and dielectric properties of EuMn2O5 and BiMn2O5 crystals are investigated over a wide range of temperatures 4.2–250 K, including the range T≫T N ≃40 K. Significant departures from the Curie-Weiss law are observed in both crystals for the magnetic susceptibility in the paramagnetic range; they are attribu…
Abstract The new coordination compounds trans ‐[Pt(H)X(PPh 3 ) 2 ] with NCN‐ and C(CN) 2 ‐functionalized anions (X − = [N(O)C(CN) 2 ] − , [NO 2 NCN] − , [N{C(CN) 2 } 2 ] − , [NCC{C‐(CN) 2 } 2 ] − , have been characterized by 1 H‐, 31 P‐, 13 C‐NMR, and IR spectroscopy and elemental analyses the crystal structures of tr…
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Abstract Miscibility behavior and rheological properties with mechanical spectroscopy study of both poly(3‐hydroxybutyrate) (PHB)/poly(ethylene oxide) (PEO) and biodegradable synthetic aliphatic polyester (BDP)/linear low density polyethylene (LLDPE) were investigated. Blends of BDP with LLDPE were immiscible, showing…
Abstract Lecithin in cosmetic emulsions produces a unique “skin feel,” which can be related to its rheological properties. In this study, water‐in‐oil (w/o) and oil‐in‐water (o/w) emulsions were made from a cosmetic‐grade caprylic/capric triglyceride with deoiled lecithin and hydroxylated lecithin. Synthetic surfactan…
Elevated temperature true stress-true strain curves have been determined for the isothermal deformation of the metastable β titanium alloy Ti-10V-2Fe-3Al in both the β and (α + β) phase fields using hot compression testing. The flow stress behaviour of the alloy, in two initial microstructural conditions, has been cor…
Liquid-crystal-induced circular dichroism (LCICD) measurements have been made to investigate the structure of smectic-${C}_{\ensuremath{\alpha}}^{*}$ using liquid-crystal-mixture systems, in which zero spontaneous polarization ${P}_{S}$=0 or infinite pitch is realized. Two main observations are as follows: (1) LCICD s…
No abstract available.
The possibility of using amorphous silicon and germanium films prepared by magnetron sputtering as components in uncooled microbolometers has been analyzed experimentally and results are presented. Amorphous silicon and germanium films having activation energies of 0.135 and 0.2 eV, and resistivities of 50 and 0.4 kΩ·…
The corrosion of zinc in sulphamic acid containing various isomer of toluidines has been studied. In plain sulphamic acid, the corrosion increases with the acid concentration and temperature. An increase in the concentration of the inhibitor increases the inhibition efficiency the order of inhibition efficiency in 0.1…
Based on high-resolution electron microscopy images and convergent-beam electron diffraction patterns, structural models of decagonal quasicrystals, which have pentagonal atom-cluster columns and belong to the space groups P10m2 and P105/mmc, have been contructed by the section method. The model for the space group P1…
The two-fold degenerate alignment of nematic liquid crystals provided by obliquely evaporated SiOx layers was studied as a function of temperature. A temperature induced anchoring transition from tilted to planar alignment with more than 80 degrees between their preferred directions was found. The director in the two-…
Three new phospholipid diols, bis[2-(2-hydroxyethyldimethylammonio)ethyl]diethylene octadecylamine diphosphate (BDODP), bis[2-(2-hydroxyethyldimethylammonio)ethyl]diethylene hexadecylamine diphosphate (BDHDP), and bis[2-(2-hydroxyethyldimethylammonio)ethyl]diethylene dodecylamine diphosphate (BDDDP), together with 1,4…
We present the first systematic investigation of the differences among reference-quality ellipsometrically measured pseudodielectric function 〈ε〉 spectra of crystalline Si, which are nominally used to approximate the bulk dielectric function of this material. In addition to the expected influence of residual overlayer…