Materials Literature
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The preparation and characterization of novel piezoelectric and pyroelectric electrets is discussed with respect to their electret properties. Charged heterogeneous electrets, like closed-cell microporous polypropylene (pp) foams and 'soft-hard' fluoropolymer hybrids are shown to yield large quasi-static and dynamic p…
In this paper, the results of an experimental project on insulating material aging, performed in both Denmark and Italy, are reported. This study was concerned with partial discharge (PD) behavior at temperatures between 30 and 80/spl deg/C using CIGRE method II. The material tested was a commercial polymethylmethacry…
Description STP 1366, the nineteenth volume in this series, examines 90 peer-reviewed papers from the international nuclear community, with the emphasis on advanced materials such as silicon carbide and vanadium alloys. A majority of the papers are devoted to pressure vessel embrittlement and its mitigation. Smaller s…
[Fe(hyptrz)3]A2·H2O (hyptrz = 4-(3′-hydroxypropyl)-1,2,4-triazole and A = 4-chlorobenzenesulfonate) represents a novel iron(II) polymeric chain compound. A discontinuous spin transition has been observed by temperature dependent magnetic susceptibility measurements. The spin transition curves are shifted from 181 K to…
Complexation of hydrated Cu(BF4)2 by 2 molar equivalents of L2R (L2Me = 2,6-bis{methyliminomethyl}pyridine, L2Cy = 2,6-bis{cyclohexyliminomethyl}pyridine, L2But = 2,6-bis{tert-butyliminomethyl}pyridine) afforded [Cu(L2R)2][BF4]2 (R = Me, 1; Cy, 2; or But, 3) in moderate yields. EPR spectroscopy in solution and the sol…
Study of melts rheological properties of unvulcanized and dynamically vulcanized polypropylene (PP)/ethylene-propylene-diene rubber (EPDM) blends, at blending ratios 10–40 wt %, EPDM, are reported. Blends were prepared by melt mixing in an internal mixer at 190°C and rheological parameters have been evaluated at 220°C…
A new type of silicomolybdate–methylsilicate–graphite composite material was prepared by the sol–gel technique and used for the fabrication of an amperometric nitrite sensor. The silicomolybdic anion acts as a catalyst, the graphite powder ensures conductivity by percolation, the silicate provides a rigid porous backb…
Surface modification of poly(ethylene terephthalate) (PET) film by an argon (Ar) plasma was investigated as a function of the distance from the Ar plasma zone. Changes in distance between the PET film and the Ar plasma zone had a strong influence on the surface modification of the film. The direct Ar plasma treatment…
The Fe-based III-V diluted magnetic semiconductor (III-V-DMS), (Ga, Fe)As, has been grown successfully on GaAs(001) substrates by molecular beam epitaxy at a substrate temperature T s ranging from 260–350°C. Secondary ion mass spectroscopy analysis has exhibited that the film composition can be expressed by Ga 1- x Fe…
Six new modular linear heterotrinuclear complexes of the types [MAMBMB] and [MAMBMC] with FeIIICuIINiII1, FeIIINiIINiII2, CoIIICuIINiII3, FeIIICuIICuII4, FeIIINiIICuII5 and FeIIIMnIICuII6 cores were synthesized using selective template reactions involving the ligands 1,4,7-trimethyl-1,4,7-triazacyclononane, tmtacn, an…
Gamma radiation-induced graft copolymerization of styrene onto poly(ethylene terephthalate) (PET) films was studied using simultaneous irradiation technique. The effects of grafting conditions on the degree of grafting were investigated. The grafting conditions include monomer concentration, irradiation dose, dose rat…
In a search for a mild, rapid, moderately low temperature route to the deposition of thin films of tin(II) sulfide (SnS) on glass, we have investigated the APCVD reaction of tri-n-butyltin trifluoroacetate with hydrogen sulfide at 350–600 °C under nitrogen. The films deposited over a 15 min period were shown to be SnS…
Silica glasses with ultrafine CuxS and CuInS2 particles (average radius of 5±3 nm) were fabricated by means of a sol–gel technique. Linear and differential absorption spectra were studied. The glasses reveal absorption peaks in the 600–700 nm range associated with the first excitonic resonance in the quantum confined…
We employ inelastic light scattering to study the dependence of the lattice and charge excitations in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ compounds on doping and temperature. The phonons reveal strong local lattice distortions in the paramagnetic state, which gradually vanish below th…
Dielectric spectroscopy was carried out to measure the α-relaxation (local segmental motion) and the higher frequency, secondary relaxation (β-mode) in 1,4-polybutadiene, both neat and containing a nonpolar diluent, mineral oil. The α-relaxation shifted to lower frequencies (antiplasticization) in the presence of the…
Abstract Containerless conditions allow well-controlled investigation of liquids at high temperatures. Levitation methods used for this purpose are reviewed, and their application is illustrated by discussion of the properties and behavior of deeply undercooled yttrium-aluminum-oxide melts.
The combination of organic imidazoline-1-oxyl-3-oxide radicals as building blocks with metal ions can yield 1-D magnetic chains in various conformations, depending on the metal ion and the 2 substituent of the radicals.
Impregnation of a mesoporous xerogel or of MCM-41 with an organic solution of the heterometallic cluster [NEt4][Co3Ru(CO)12], followed by thermal treatment under an inert atmosphere, leads to highly dispersed magnetic nanoparticles under milder conditions than when conventional metal salts are used as precursors.
This article discusses the specific volume-measurement methods for semicrystalline polymers needed in order to obtain reliable data. Particularly, the effect of the cooling rate is analyzed, taking into account the thermal gradient in a cylindrical sample. Experimental results for a polypropylene form the basis for th…
We report the finding of an electron-paramagnetic-resonance (EPR) center, labeled O4, which contains cobalt on a site in the diamond lattice. O4 is observed at low temperatures $(<30 \mathrm{K})$ in high temperature and pressure synthetic diamonds grown with a cobalt containing metal-solvent catalyst after a high-t…