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Recent observations have suggested a revision of the prevailing view that monodisperse foams are generally disordered. Among the ordered structures which are possible, b.c.c. (the Kelvin structure) should prevail at low liquid fractions, and f.c.c. (or other close-packed structure) at high liquid fractions. The instab…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTValence isomers of benzene and their relationship to the isoelectronic isomers of arsenic molecule (As6)D. Scott Warren, Benjamin M. Gimarc, and Ming ZhaoCite this: Inorg. Chem. 1994, 33, 4, 710–715Publication Date (Print):February 1, 1994Publication History Published online…
The polarized optical absorption spectra of ${\mathrm{Cr}}^{3+}$ ions have been systematically investigated in two acentric crystals with Ca-gallogermanate structure: ${\mathrm{La}}_{3}$${\mathrm{Ga}}_{5.5}$${\mathrm{Nb}}_{0.5}$${\mathrm{O}}_{14}$ and ${\mathrm{La}}_{3}$${\mathrm{Ga}}_{5.5}$${\mathrm{Ta}}_{0.5}$${\mat…
Abstract Monolayer to bilayer (MTB) and bilayer to pseudotrimolecular (BTP) transitions were observed for smectites exchanged with symmetrical tetraalkylammonium cations of increasing sizes: + NR 4 , where R = (CH 2 ) n CH 3 , with 0 ≤ n ≤ 7. In the case of SWy-1, SHCa-1 and SWa-1, the variation in layer spacing obser…
The kinetics of isobutylene (IB) polymerization, initiated by 2-chloro-2,4,4-trimethylpentane (TMPCI)/TiCI4 initiator/coinitiator system in methyl chloride/methyl/cyclohexane solvent mixture at −90°C, was investigated. The existence of a dynamic equilibrium between dormant and active species was verified by obtaining…
Article FT-IR Spectroscopic Study of NH3 and CO Adsorption and Coadsorption on TiO2 (Anatase) was published on February 1, 1994 in the journal Zeitschrift für Physikalische Chemie (volume 187, issue 2).
The preparation and characterization of supported bimetallic clusters has been an active area of research following the initial pioneering efforts of Sinfelt in the late 1960s and early 1970s [1–3]. Because of the importance of supported bimetallic and multimetallic catalysts in industrial applications such as petrole…
The attenuated total reflection (ATR) method in a prism/gap/metal configuration was used in Raman spectroscopy of molecules adsorbed on silver to improve the detection limit. The thickness of the air gap was controlled between Λ L /2 and 2Λ L (Λ L : wavelength of the incident light) with a biaxial suspension. All the…
Abstract The intramolecular magnetic interactions between 1/2 spins of two oxovanadium(IV) ions were studied in the complexes L[VO(hfac)2]2 (hfac = hexafluoroacetylacetonate, L = 4-methyl-, 4,6-dimethyl-, 4-amino- and unsubstitute-pyrimidines, and quinazoline). The magnetic measurements revealed that the vanadium spin…
K 3 Na(CrO 4 ) 2 , M r =327.27, λ(Mo Kα)=0.71073 A, two crystals were measured; crystal A at 290, 230 and 200 K and crystal B at 200 K. Both crystals were twinned in the room-temperature phase (P3m1); the twinning operation T was the twofold axis parallel with the c axis. After the phase transition (T trans =239 K) in…
Pseudomonas fluorescens appeared to grow in a mineral medium containing strontium (5 mM) complexed to citrate, the sole source of carbon, without any evident inhibition in cellular yield. Atomic absorption studies showed that the divalent metal was excluded from the cytoplasmic component and was initially found in the…
The diffraction of electromagnetic radiation from one-dimensional planar transmittive screens illuminated by Gaussian-profile beams is examined. The incident Gaussian beam is expressed as a superposition of elementary plane waves that propagate along different directions, with the aid of the plane-wave spectrum techni…
Flavocytochrome b2 from Saccharomyces cerevisiae catalyzes the oxidation of L-lactate to pyruvate and the electron transfer to cytochrome c in the mitochondrial intermembrane space. It is a homotetramer with a molecular weight of 4 x 58 kDa, each monomer of which is composed of 2 distinct domains, the one carrying FMN…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structure, Morphology, and Phase Transitions in Aromatic Polyimide Oligomers. 1. Poly(4,4'-oxydiphenylene pyromellitimide)Jiang Liu, Stephen Z. D. Cheng, Frank W. Harris, Benjamin S. Hsiao, and Kenncorwin H. GardnerCite this: Macromolecules 1994, 27, 4, 989–996Public…
Phosphonate Scale Inhibitor Adsorption/Desorption and the Potential for Formation Damage in Reconditioned Field Core M. M. Jordan; M. M. Jordan Heriot-Watt U. Search for other works by this author on: This Site Google Scholar K. S. Sorbie; K. S. Sorbie Heriot-Watt U. Search for other works by this author on: This Site…
Interactions between BaTiO 3 , and three binary glasses were studied through the reaction of BaTiO 3 , powder with glass powder. For PbO–B 2 O 3 and PbO–SiO 2 glasses, the reaction led to stable compound formation, the substitution of Pb in the BaTiO 3 structure, and noticeable grain growth of BaTiO 3 . The interactio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadial mixing diffusion of hydrogen in a packed-bed type of palladium membrane reactorNaotsugu Itoh, Wei Chun Xu, and Kenji HarayaCite this: Ind. Eng. Chem. Res. 1994, 33, 2, 197–202Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Publis…
The thermodynamic properties and conformational structures in the crystalline and liquid crystalline phases of 4-(1-methylheptyloxycarbonyl)phenyl 4′-octyloxybiphenyl-4-carboxylate (MHPOBC) have been investigated by Raman scattering, X-ray diffraction and differential scanning calorimetry (DSC). MHPOBC can assume two…
ABSTRACT Vegetative cells and zoospores of Hormotilopsis gelatinosa Trainor & Bold, H. tetravacuolaris Arce & Bold, Planophila terrestris Groover & Hofstetter, and Phyllogloea fimbriata (Korchikov) Silva were examined by transmission electron microscopy. All cells had pyrenoids traversed by cytoplasmic cha…
Inhibition of the corrosion of aluminum (Al) in hydrochloric acid (HCl) by some triazoline derivatives was studied in relation to the concentration of the inhibitors using gasometry, the weight-loss method, and the potentiodynamic technique. All compounds investigated were found to be inhibitors of the mixed type. The…