Materials Literature
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Abstract In this paper thermal and thermo‐oxidative stability of nylon 6 based nanocomposites containing up to 5% by weight of fatty acid coated calcium carbonate (CaCO 3 ) nanoparticles is studied. Thermal stability of compression‐moulded samples was evaluated by thermogravimetric analysis (TG) under air and nitrogen…
The IEC 60093 Standard, prepared by the International Electrotechnical Commission in 1980, sets up methods of measurements, determination and calculation of volume and surface resistivities of solid dielectrics. The document contains some editorial mistakes as well as content-related inaccuracies that require revision…
Allanite-(La) is a member of the epidote group. It was sampled at Buca della Vena mine, near Stazzema, Apuan Alps, Tuscany, Italy. It occurs as prismatic crystals up to 2–3 mm in length along [010] within barite veins cutting a dolomitic metamorphosed limestone. The mineral is black with brownish refl ections, a brown…
Viscometric measurements, in toluene solution at 30 ºC, were performed with high-cis polybutadiene synthesized by neodymium based catalyst. Six different equations were used to calculate intrinsic viscosities and viscosimetric constant values: Huggins, Kraemer, Martin and Schulz-Blaschke by graphic extrapolation, and…
A 0.1–0.15-eV displacement of the fundamental absorption edge in the optical absorption spectra of nanocrystalline oxide n -CuO (relative to the position of the fundamental absorption edge in the spectra of CuO single crystals) towards lower energies (red shift) is observed against the background of strong blurring. N…
Systematic series of lead-bismuth borate glasses, where PbO, Bi2O3 and B2O3 content change for every series based on their weight percentage have been prepared. The ultrasonic and glass transition temperature (Tg) of this glass system have been studied using the Matec MBS-8000 Digital Signal Processing and conventiona…
Despite variation in their protoplast organization and wall structure, monoraphid diatoms have traditionally been grouped as a single family or order, intermediate between the araphid and biraphid diatoms. However, the predominantly marine or brackish species of Achnanthes sensu stricto share protoplast and frustule f…
The effects of the degree of silicate surface modification by organic surfactants and the nature of surfactant−matrix enthalpic interactions on polymer-layered silicate nanocomposite (PLSN) morphology have been systematically investigated. Using cation exchange to modify montmorillonite, a series of “partially” modifi…
Two tripodal, hexadentate pyrone-based chelators have been prepared. These ligands form stable, soluble complexes with gadolinium(III). The complexes show aqueous stability comparable to that of [Gd(DTPA)]2- at pH 7.4. Evaluation by relaxometry shows that these complexes have two inner-sphere water molecules and a ver…
We consider a chain of coupled and strongly pinned anharmonic oscillators subject to a non-equilibrium random forcing. Assuming that the stationary state is approximately Gaussian, we first derive a stationary Boltzmann equation. By localizing the involved resonances and identifying the umklapp processes, we next inve…
Hemp strands as natural lignocellulosic fibers are used to reinforce polypropylene composites obtained by injection molding. The aim of this work is to improve the final mechanical properties using simple and cheap treatments. Therefore, a refining process is applied to increase the specific surface and the fibrillati…
Yttria‐stabilized zirconia (YSZ) hollow fiber membranes have been developed by a combined phase inversion and sintering method. An organic binder solution (dope) containing suspended YSZ particles is spun to form a hollow fiber precursor, which is then sintered at elevated temperatures. The prepared hollow fibers have…
A new concept of a passive matrix ferroelectric liquid crystal display (FLCD) with a memorized gray scale is proposed. The physical origin of the gray scale in ferroelectric liquid crystal displays is considered. The criterion of reliable bistability is derived depending on the FLC hysteretic behavior in an electric f…
Abstract New inorganic‐organic hybrids were synthesized through the reaction of castor oil (CO) or epoxidized castor oil (ECO) with tetraethoxysilane (TEOS). The mass proportions of ECO/TEOS varied from 90∶10 to 60∶40, and films of the material were thermally cured. An IR spectroscopy analysis was performed, and macro…
Abstract Polyamide 6 and pristine montmorillonite have been melt blended in an extruder and water was injected into the melt in order to produce nanocomposites. The pristine clay was found to be exfoliated and dispersed homogenously in the nanocomposites. A mechanism explaining the formation of such nanocomposites is…
The shear viscosities of Cl-bearing melts in the system Na 2 O-Fe 2 O 3 -Al 2 O 3 -SiO 2 were determined at temperatures of 550-950 °C in the range of 10 8.5 to 10 12.0 Pa s using the micropenetration technique. The compositions are based on addition of Fe 2 O 3 or FeCl 3 to aluminosilicate glasses with a fixed amount…
Abstract Twenty two samples were studied to investigate the nature and evolution mechanism of mixed-layer kaolinite-smectite (K-S). We examined the <2 µm or <0.2 µm fraction of K-S formed by hydrothermal and hypergenic alteration of volcanic material. The samples are from three localities: 20 specimens from a To…
A new family of quaternary mixed-framework chalcohalide semiconductors has been synthesized by conventional solid-state reactions in an intermediate temperature region of 400−430 °C. These include CdSbS 2 Cl ( 1 ), CdSbS 2 Br ( 2 ), CdBiS 2 Cl ( 3 ), CdBiS 2 Br ( 4 ), CdBiSe 2 Br ( 5 ), and CdBiSe 2 I ( 6 ). Single-cr…
An attempt was made to incorporate β-Cyclodextrin (β-CD) onto the surface of the nanofiber to target potential applications in organic waste treatment. Phenylcarbomylated and azido phenylcarbomylated β-CD were successfully blended with poly(methyl methacrylate) (PMMA) and electrospun into nanofibrous membrane respecti…
The electron backscattering coefficient of liquid water has been determined for electrons in the energy range 15-30 keV using Quantomix capsules. Values of the mean atomic number for water estimated from a fit to the backscatter yield, the mean ionization potential of water and from Monte Carlo simulations, show that…