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Silylene (SiH 2 ) radicals have been detected by intracavity laser absorption spectroscopy in a parallel plate RF-discharge system used in the chemical vapor deposition of hydrogenated amorphous silicon. By the use of two different calibration methods, an absolute density ranging from 2×10 8 to 6×10 9 cm -3 has been o…
The overlapping fdhA and fdhB genes of Methanobacterium formicicum, which encode the alpha and beta subunits, respectively, of formate dehydrogenase, were cotranscribed as part of an approximately 4.5-kb transcript. An additional gene (fdhC) upstream of fdhA was cotranscribed with fdhA and fdhB. The deduced amino acid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDevelopment of phase morphologies of poly(methyl methacrylate)-polystyrene-toluene mixtures in electric fieldsGanesh Venugopal and Sonja KrauseCite this: Macromolecules 1992, 25, 18, 4626–4634Publication Date (Print):August 1, 1992Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state NMR studies of the molecular motion in the kaolinite: DMSO intercalateMelinda J. Duer, Joao Rocha, and Jacek KlinowskiCite this: J. Am. Chem. Soc. 1992, 114, 17, 6867–6874Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Publish…
A direct electron to carbon DNP solid effect polarization transfer is observed for the aromatic and carbonyl carbons of polycarbonate homogeneously doped with BDPA. The direct electron to carbon polarization transfer operates over a range of 30 to 60 A. Carbons that are closest to the frees radicals are polarized firs…
A solution of the problem of topology of a hydrogen bond net in a triple helix of collagen is suggested on the basis of an analysis of thermodynamic data on denaturation of phylogenetically different collagen [T. V. Burjanadze (1982), Vol. 21, pp. 1489-1501; T. V. Burjanadze, E. I. Tiktopulo, and P. L. Privalov (1987)…
Summary This paper describes a theoretical approach to determine the inhibitor dynamic adsorption isotherm from coreflood experiments. The main feature of the isotherm that contributes principally to the long squeeze life is highlighted. The problems of modeling near-well squeeze treatments and an improved simulator a…
Abstract The microphase separation transition (MST) has been studied for short chain diblock copolymers poly(styrene‐ b ‐isoprene) and poly(styrene‐ b ‐mma). A detailed analysis of small‐angle x‐ray scattering (SAXS) profiles in the homogeneous phase allows determination of the interaction parameter and the spinodal t…
Three types of ternary selenides with layered composite crystal structures, (PbSe) 1.14 NbSe 2 [A], (PbSe) 1.14 (NbSe 2 ) 2 [B] and (PbSe) 1.14 (NbSe 2 ) 3 [C], have been prepared and characterized by powder X-ray diffraction, electron diffraction, intercalation and electric resistivity measurement. Results suggest th…
High-temperature single-crystal measurements of metamict zircon were performed up to 2000 K and the recrystallization was monitored using the width and intensity of selected peaks. Full data sets were collected at room temperature, 1573 and 1823 K. The changes in the probability density function (p.d.f.) of the O atom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContribution of physical blocking and electronic effect to establishment of strong metal-support interaction in rhodium/titanium dioxide catalystsJuan P. Belzunegui, Jesus Sanz, and Jose M. RojoCite this: J. Am. Chem. Soc. 1992, 114, 17, 6749–6754Publication Date (Print):Aug…
The properties of the interface between polystyrene (PS) and a random copolymer of polystyrene and poly(parahydroxystyrene) (PPHS) were modified by addition of a diblock copolymer of deuterated polystyrene (dPS) and poly(2-vinylpyridine) (PVP). Segregation of diblock copolymer chains to the interface between the immis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly[3-(4-octylphenyl)thiophene], a new processible conducting polymerQ. Pei, H. Jarvinen, J. E. Osterholm, O. Inganaes, and J. LaaksoCite this: Macromolecules 1992, 25, 17, 4297–4301Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Publish…
Abstract NMR spectra of PF1-1 Floridan palygorskite strongly suggest that Al 3+ occurs only in octahedral coordination. X-ray microanalysis of the palygorskite fibers indicate a chemical composition defined by the atomic ratios: Mg/Si = 0.34, Al/Si = 0.27, and Fe/Si = 0.04. Considering the NMR and CEC data in this rep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis- and tris(tetrathiafulvalenes) (TTFs) derived from reactions of the TTF-thiolate anionMartin R. Bryce, Gary J. Marshallsay, and Adrian J. MooreCite this: J. Org. Chem. 1992, 57, 18, 4859–4862Publication Date (Print):August 1, 1992Publication History Published online1 May…
Abstract X-ray diffraction patterns were obtained from rock fragments, < 1 μ m randomly oriented freeze-dried powders, and < 1 μ m oriented aggregates for 11 mixed-layered illite/smectite samples (K-bentonites) that cover the range from 14 to 100 percent expandable. In all cases, 00 l and hkl comparisons show no…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation P. Valkó, M. J. Economides; Volume equalized constitutive equations for foamed polymer solutions.…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium constants and the prediction of phase behavior for phenoxy blends with aliphatic polyestersMichael M. Coleman, Xiaoming Yang, Paul C. Painter, and John F. GrafCite this: Macromolecules 1992, 25, 17, 4414–4424Publication Date (Print):August 1, 1992Publication Hist…
We have made a systematic survey of the behavior of colloidal polystyrene latex spheres (PLS's) in critical mixtures of 2,6-lutidine plus water at temperatures where the liquid mixture separates into two immiscible phases. By varying the particle size, particle-surface charge density, and global PLS's concentration, w…