Materials Literature
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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…
We have demonstrated that electron energy-loss spectroscopy in transmission electron microscopy is a useful technique for analysis of the high-frequency dielectric properties on a microstructural level. Compositional variations and interfacial elastic strain of epitaxial (001) SrTiO3 thin films had a small effect on t…
The structure, Curie temperature and magnetostriction of PrxDy1−xFe2 (0⩽x⩽0.5) and Pr0.4Dy0.6(Fe1−yMy)2 (0⩽y⩽0.6) alloys (M=Co, Ni) have been investigated using optical microscopy, x-ray diffraction, ac initial susceptibility and standard strain gauge techniques. The matrix of homogenized PrxDy1−xFe2 alloys is a cubic…
The erosion of polymers and polymer-based materials (such as composites and paints) due to atomic oxygen (AO) present in the low Earth orbit (LEO) environment is described. Since many polymers are used extensively to fabricate spacecraft structures and components, a method of protecting them from AO erosion was develo…
The compatibility of d 8 -poly(methyl methacrylate) ( d 8 -PMMA) and a series of poly( n -alkyl methacrylate)s (PnAlkMA) is studied by systematic variation of the length of the n -alkyl group from ethyl (EMA) to n -pentyl (nPenMA). Simultaneously, a series of symmetric diblock copolymers comprised of d 8 -PMMA and of…
A noteworthy inhomogeneous distribution of Ni in low-alkali borate glasses has been shown by Ni K-edge EXAFS (Extended X-ray Absorption Fine Structure). The first evidence of a multiple scattering feature in a glassy matrix indicates an extended intermediate range order extending up to 6 A. The Ni-enriched domains con…
This study has (a) examined the profile of recycled postconsumer fibers, (b) evaluated product characteristics that are suitable for recycled postconsumer fiber application, and (c) explored the market potential for recycled postconsumer fiber products. Average fiber content (by weight) of used clothing in this study…
Electronic absorption spectroscopy was used to measure the molecular association of copper phthalocyanine tetrasulfonate in micellar solutions, a microemulsion made with cationic surfactant, and homogeneous solvents. Analysis of absorbance versus concentration data using a multiple-aggregation model and non-linear reg…