Materials Literature
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In the present investigation the separate and combined effects of cerium and lanthanum on the graphite formation in ductile cast iron have been investigated, using directional solidification. It is shown that both elements are carbide formers in that they increase the undercooling for graphite formation. The observed…
Abstract The practical application of commercial polymer flame retardants can no longer meet present requirements in terms of effectiveness or hazard. The most effective flame retardants used thus far have been halogen‐, phosphorus‐, antimony‐, and heavy‐metal‐based compounds, which, however, have the most environment…
Abstract— A method of controlling the color of a holographic polymer‐dispersed liquid‐crystal (HPDLC) reflective display device has been achieved. By merely controlling the optical setup during fabrication, without changing the materials or laser light source, three primary‐color devices were fabricated. Since the col…
Abstract A new ortho-hydroxy-aryl-phosphonate additive was used to improve the flame resistance of an epoxy/anhydride system. Thermal, rheological, L.O.l. and SEM experiments were carried out to show that the P-additive acts not only as a flame retardant but also as a curing agent.
Abstract Thermal stability of poly(methyl methacrylate‐co‐butyl acrylate) and poly(styrene‐co‐butyl acrylate) modified with a small amount of acrylic acid and/or N‐methylolacrylamide as a crosslinking agent was studied in this work. Programmed thermogravimetric analysis has been used to study the effect of copolymer c…
Nanostructured nonstoichiometric vanadium carbide VC 0.87 was obtained in powdered form using the ordering effect. The composition, structure, and properties of the carbide were studied by chemical and thermogravimetric analysis, gas chromatography, x-ray diffraction, optical and electronic microscopy, electron-positr…
We have designed two integrated experiments to serve as an introduction to the study of inclusion phenomena. The first one allows measurement, by UV-Vis spectrophotometry, of the equilibrium constant of the formation of the inclusion complex of an azo-dye (guest molecule) in an a-cyclodextrin (host molecule). In the s…
Abstract When polymers are guests in crystalline inclusion compounds (ICs) formed with small‐molecule hosts, they occupy a unique environment. In a cocrystallization process the small‐molecule host forms a crystalline lattice containing long narrow channels where the guest polymer chains are included. Because of the n…
The temperature dependence of the Raman spectra of NaNO3–KNO3 was employed to follow structural phase transitions of mixed crystals with different compositions. Solid solutions in the NaNO3 terminal phase behaved like NaNO3 I, solid solutions in the KNO3 terminal phase behaved like KNO3 I and solid solutions in the in…
The strengths of porous phosphate glass‐ceramic specimens, with relative densities ranging between 0.25 and 0.50, were measured by four‐point bending at room temperature. An analysis of the data, using Weibull statistics, indicated that such a treatment, usually performed on dense ceramics, can also be used on porous…
Abstract A qualitative model that satisfactorily explains the rheological behavior of PVC plastisols during gelation and fusion is shown. Several industrial production cases have been analyzed, and the rheological characterization of the corresponding plastisols during gelation and fusion processes has proved to be a…
Abstract The design of controlled release polymer dispensers (CRPD) for effective release of the active ingredients at desired rates requires a careful study and generation of data on several properties of the polymer membranes. Presence of optimum tensile properties is one of the prerequisites for the CRPD in decidin…
GaSe thin films were grown on a GaAs(100) substrate by molecular beam epitaxy. Microstructures of the thin films and interface were characterized by transmission electron microscopy. The dominant polytype formed in the GaSe thin films was a γ type, which has a 3R-rhombohedral structure with R3m space group. Predominan…
Theoretical and experimental investigations of electron field emission from silicon-based resonance-tunneling layered structures have been performed. Numerical simulation of resonant and nonresonant field emission in Si-SiO2-Si*-SiO2 multilayer cathodes (MLCs) with quantum well (QWs) which takes into account the tunne…
Cadmium sulphide polycrystalline thin films were deposited under potentiostatic control on indium tin oxide (ITO) coated glass substrate from an acidic solution containing cadmium chloride and sodium thiosulphate. Voltammograms were recorded to determine the optimal potential region for the co-deposition of CdS. The d…
In the present study, the separate and combined effects of cerium and lanthanum on graphite formation in ductile cast iron have been investigated, using directional solidification. It is shown that both elements are carbide formers in that they increase the undercooling for graphite formation. The observed behaviour i…
Bisher unbekanntes, silbermetallisches, luftempfindliches Rb5Hg19 kann phasenrein sowohl in mikro- als auch einkristalliner Form direkt aus den Elementen erhalten werden. Es kristallisiert tetragonal mit den Gitterkonstanten: a = 1156,1 pm, c = 1051,0 pm (Z = 2, Raumgruppe I4/m, Nr. 87, Smp. 467 K) in einer neuen Defe…
The deep UV mastering process of the next generation high density disk is demonstrated for the first time using an all-solid-state continuous-wave 266 nm laser. We have developed a novel deep UV master recorder with a laser source, and achieved a density of 20 Gbytes capacity (14 Gbit/inch 2 ) with acceptable jitter f…
Abstract The Cu,Cr-, Zn,Cr- and Cu,Al-layered double hydroxides have been synthesized by the coprecipitation method and characterized by elemental analysis, PXRD, SEM/EDS and BET. The mixed oxide materials obtained upon calcination at 873 K show very high catalytic activity for the combustion of toluene and ethanol. T…
Experimental solubilities are reported at 25.0°C for anthracene dissolved in twenty-one different organic nonelectrolyte solvents containing cyano-, ester-, ether-, chloro-, fluoro- and amide-functional groups. Results of these measurements, combined with previously published anthracene solubility data, are used to te…