Materials Literature
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Abstract The adsorption isotherms of O 2 , N 2 , CH 4 , CO 2 , SO 2 , and NO on five pillared clays (Zr, Al, Cr, Fe, and Ti‐PILCs) are measured. The equilibrium selectivity of CH 4 /N 2 on Al‐PILC is greater than 5.0, which exceeds all known sorbents by a large margin. In addition, high SO 2 /CO 2 equilibrium selectiv…
Three different diameters (0.50, 1, and 2 μm) of monosized spherical pores were introduced, at different volume percents up to 15%, into two submicrometer commercial Zr(Y)O 2 powders which exhibited either sluggish (ZrO 2 –3 mol% Y 2 O 3 ) or rapid (ZrO 2 –8 mol% Y 2 O 3 ) grain growth kinetics. Densification and grai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColumnar ordering of liquid-crystalline discotics in Langmuir-Blodgett filmsO. Karthaus, H. Ringsdorf, V. V. Tsukruk, and J. H. WendorffCite this: Langmuir 1992, 8, 9, 2279–2283Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published…
Holograms are recorded by a 514-nm laser polarized parallel to the molecular director in an azo-dye-doped nematic liquid crystal. For some surface treatments, the recorded holograms persist in the dark. For glass surfaces, exposure to light polarized normal to the molecular director erases the hologram. The hologram a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonotropic liquid crystal behavior in two poly(ester imides) with even and odd flexible spacersRicardo Pardey, Anqiu Zhang, Patricia A. Gabori, Frank W. Harris, Stephen Z. D. Cheng, Jerry Adduci, John V. Facinelli, and Robert W. LenzCite this: Macromolecules 1992, 25, 19, 50…
A polytopic host for several cations and anions or cation/anion aggregates was previously unknown. The anion of the title (structure depicted on the right) is a host/guest system in which the “host”—the shell—consists of electrophilic and nucleophilic components. The cation/anion aggregate (NH4)2Cl2, a section of the…
The composition of films deposited in RF glow discharges fed with tetraethoxysilane and oxygen mixtures has been investigated by means of in situ x‐ray photoelectron spectroscopy and infrared spectroscopy. These results, combined with mass spectrometric investigations of the gas phase, indicate that the overall deposi…
A new, low band‐gap polymer (see figure), a hybrid of polythiophene and polyisothianaphthene, has been synthesized. Current interest in the synthesis of low bandgap polymers is considerable in view of their potentially superior conductivity and nonlinear optical properties. The results complement well the independent…
This paper describes the synthesis and characterization of AB block copolymers based on ω-[(4-cyano-4′-biphenyl)oxy]alkyl vinyl ether (6-n), with alkyl being ethyl (6-2), propyl (6-3), nonyl (6-9), and undecanyl (6-11), with 1H, 1H, 2H, 2H-perfluorodecyl vinyl ether (CF8), poly[(-6-n)-b-CF8]X/Y (where X/Y refers to th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTstar-Porphyrazines: synthetic, structural, and spectral investigation of complexes of the polynucleating porphyrazineoctathiolato ligandChristopher S. Velazquez, Glenn A. Fox, William E. Broderick, Kevin A. Andersen, Oren P. Anderson, Anthony G. M. Barrett, and Brian M. Hoff…
Azotobacter vinelandii UWD formed polyhydroxyalkanoate (PHA) copolymers containing beta-hydroxybutyrate and beta-hydroxyvalerate (HV) when grown in a medium containing glucose as the primary C source and valerate (pentanoate) as a precursor. Copolymer was not formed when propionate was added to the glucose medium but…
We report erasable holographic recording with a resolution of at least 2500 lines/mm on unoriented films of sidechain liquid-crystalline polyesters. Recording energies of approximately 1 J/cm(2) have been used. We have obtained a diffraction efficiency of approximately 30% with polarization recording of holograms. The…
The entire nucleotide sequence of the Bacillus brevis grsB gene encoding the gramicidin S synthetase 2, which activates and condenses the four amino acids proline, valine, ornithine and leucine has been determined. The gene contains an open reading frame of 13,359 bp which encodes a protein of 4453 amino acids with a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe near-infrared spectrum of the guanidinium ion: a local-mode analysisIan M. Walker and Paul J. McCarthyCite this: Inorg. Chem. 1992, 31, 20, 4122–4127Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992…
Nb 0.89 Fe 0.93 Te 2 and Ta 0.77 Fe 0.90 Te 2 were prepared by chemical transport reactions. The crystal structures of both compounds were determined using X-ray single crystal methods. The structures of the layer compounds Nb 0.89 Fe 0.93 Te 2 (Pmna, Z = 2, a = 7.951(1) Å, b = 7.241(1) A, c = 6.233(1) Å) and Ta 0.77…
Magnetic properties of Sm/sub 2/Fe/sub 17/N/sub x/ and SmFe/sub 5/N/sub y/ with different nitrogen contents are studied. It was found that the magnetocrystalline anisotropy for both Sm/sub 2/Fe/sub 17/N/sub x /and SmFe/sub 5/N/sub y/ alloys changes from easy plane to easy axis at x>0.13 and y>0.07. The 1:5, 1:3, and a…
An acid‐activated clay (Çanakkale montmorillonite from Turkey) was used to adsorb chlorophyll from hexane solutions. The phenomenon seems to be mainly driven by the interaction of chlorophyll with acid sites. The adsorption of chlorophyll on Brönsted acid sites was indicated by a characteristic infrared band for the ‐…
The crystal structure of Ag3CuS2 has been determined by using X-ray powder diffraction data. The unit cell is tetragonal, a = 8.6705(10), c = 11.7573(18) Å , and the space group is I 41/ amd (141) with Z = 8. A starting model for the structure was derived by using direct methods and difference Fourier cycling from 93…
Abstract This paper presents procedures to monitor oxidation degradation of two commonly used cable insulations, crosslinked polyethylene (XLPE) and ethylene propylene rubber (EPR). Since the techniques described require only micro specimens, deterioration of cable insulation can be monitored without destroying the fu…
A commercial LiF powder sample was investigated using x-ray photoelectron spectroscopy. Sample preparation included washing in acetone and methanol, pressing into indium foil and gold decoration for charge correction. Measured binding energies were very similar to those previously reported. [See W. E. Morgan, J. R. Va…