Materials Literature
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The ionic conductivity and permittivity of glasses based on ZrF4, BaF2, LaF3, AlF3 and NaF (ZBLAN) or PbF2, InF3, BaF2, AlF3 and LaF3 (PIBAL) are studied. The influence of the glass composition on the glass transition temperature (Tg) and on the crystallization temperature (Tx) is reported. For all ZBLAN glasses the t…
Abstract The inclusion of vanadocene dichloride (VDC) and 1,1′-dimethyl vanadocene dichloride (MeVDC) into cyclodextrines (α-CD, β-CD and γ-CD) was studied by EPR spectroscopy. It was found that VDC and MeVDC with β-CD and γ-CD form true inclusion compounds, but with α-CD, VDC and MeVDC gave only fine dispersion mixtu…
To study the behavior of fluorite in SiO 2 ‐Al 2 O 3 ‐Na 2 O‐K 2 O‐H 2 O melts, we conducted both crystallization and dissolution experiments. In the first case, fluorite crystallized from melts enriched in Ca relative to F. In the second case, ground fluorite (<10 μm) was partially dissolved into melts of initiall…
A nonwoven fibrous filter media is modeled as a planar stochastic array of straight lines defining multiple polygons. The cumulative distribution and mean of the hydraulic diameter of these polygons is determined, and related theoretically to the “mean flow” pore diameter commonly measured by commercial partial flow t…
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Two series of three‐ring heterocyclic liquid crystalline (LC) materials have been synthesized and characterized, one incorporating a thiophene ring and the other containing a thiophene‐pyrimidine moiety. This is the first study to show the effect of a thiophene‐pyrimidine moiety on the thermal and physical properties…
The effect of metal loading on structural properties and CO oxidation activity of coprecipitated Co/Al2O3 catalysts was investigated. The results indicated the participation of cobalt in the Co-Al skeleton for all coprecipitated samples. Environmental-SEM-EDXS studies showed that at loadings higher than ca. 15 wt.-%,…
Ten new species of small dictyostelids, five belonging to Acytostelium (A. anastomosans, A. longisorophorum, A. magnisorum, A. serpentarium and A. singulare) and five to Dictyostelium (D. amphisporum, D. naviculare, D. oculare, D. potamoides and D. stellatum), were isolated from forest soils in the Great Smoky Mountai…
International recommendations for changes to the SI brochure regarding the definition and use of the quantity dose equivalent are presented. The second part of this note is a simple explanation of the difference between a radiation quantity and its unit.
Abstract Spider dragline silk is an extremely strong biopolymer and has unique combination of desirable mechanical properties. In the present paper dragline of Golden Nephila spider was studied for dimensional, structural, physical and tensile properties. The test results established significant variability in diamete…
Abstract Clay minerals occur as replacements of olivine, pyroxenes, plagioclase and interstitial materials, and as vesicle fillings, in altered basalts from the Middle Atlas (Morocco). Phyllosilicates are the main components of this alteration process. They have been characterized here by optical microscopy, X-ray dif…
Polyamidoamine dendrimers have been synthesised from ethylenediamine and methyl acrylate and their effectiveness in decolorising wastewater containing Acid Fuchsin and Methyl Blue demonstrated. The effect of variables, such as initial pH, quantity and generation of dendrimer, has been investigated. The experimental re…
High quality undoped and Ga2O3 doped ZnO nanoribbons are grown by chemical vapor transport and condensation. The effect of the dopant on the structural and optical properties is investigated. The hexagonal wurtzite structure is ascertained with X-ray diffraction and Raman spectroscopy. Photoluminescence on doped ZnO r…
Two new homologous series of seven‐ring bent‐core compounds derived from 5‐chlororesorcinol have been synthesized. Many of the lower homologues in both series exhibit the rectangular columnar B1 phase. However, the three analogous compounds having long terminal alkyl chains exhibit a switchable lamellar phase, which i…
Abstract The ligand H 5 dotasa (=( αRS )‐ α ‐(carboxymethyl)‐1,4,7,10‐tetraazacyclododecane‐1,4,7,10‐tetraacetic acid) is a H 4 dota‐like macrocyclic ligand with a carboxymethyl CH 2 COOH substituent at the C( α ) atom of one of the four acetate pendant arms of H 4 dota (=1,4,7,10‐tetraazacyclododecane‐1,4,7,10‐tetraa…
High third-order nonlinear optical susceptibility (χ(3)(ω; ω, −ω, ω) = −4,2 × 10−16(m2/V2)). In the visible spectral range may be achieved in PVA composites containing narrow bad gap PbS semiconductor nanocrystals with a strong limitation of the area of charge carrier delocalization.
A series of experiments on fuel/coolant interaction (FCI) was performed in the TROI facility, where the composition of the mixture was varied. The compositions of the UO2 and ZrO2 mixture in weight percent were 50:50, 70:30, 80:20, and pure ZrO2. The responses of the system including the temperature of the pool of wat…
Substituted iron and cobalt phthalocyanines are easily prepared by microwave irradiation of the starting materials under solvent free condition, which reduced reaction time considerably. The synthesized metallophthalocyanines (octachloro-, tetranitro-, tetracarboxy- or polyphthalocyanine) are used as epoxidation catal…
Low voltage cathodoluminescence (LVCL) and photoluminescence measurement were carried out to better understand the role of Gd in (Y,Gd)VO4:Eu phosphor and to compare two different synthesis methods (solid-state reaction, coprecipitation reaction) and their preparing conditions. From the analysis of LVCL measurement, i…
This article reviews recent findings on the formation of ordered colloidal structures from bulk demixing in liquid crystalline materials. In contrast to classical phase separations, which lead to randomly distributed macrodomains of various sizes, demixing in liquid crystals leads to remarkably uniform droplets that f…