Materials Literature
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Influence of surface charging on creepage discharge propagation in air and SF/sub 6/ gas was investigated. The authors have employed a surface charging system using corona discharges, which permitted the deposition of surface charge on solid dielectrics with a given density distribution. By applying a lightning impuls…
Abstract In this paper, we model the elastic modulus of in ‐ situ composite fibers from polymer blends where a fibrous liquid crystalline polymer (LCP) phase is induced by drawing. We propose a composite model to account for the change of the elastic moduli of the reinforcing LCP phase with the draw ratio of the compo…
We consider field distributions in fractional Talbot planes behind a periodic two-dimensional complex-amplitude transparency that is illuminated by a unit-amplitude plane wave. In the paraxial approximation the field in various fractional Talbot planes is expressed as a sum of contributions from a finite number of poi…
In this study transmission infrared spectra were recorded for 15 uranium oxides previously characterized by X-ray diffraction. The infrared spectra obtained demonstrated that all the uranium oxides studied could be distinguished, even for the closely similar structures of UO 2 and U 4 O 9 . The infrared studies of U 4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinitiated Graft Poly(organophosphazenes): Functionalized Immobilization Substrates for the Binding of Amines, Proteins, and MetalsHarry R. Allcock, Constance J. Nelson, and William D. CoggioCite this: Chem. Mater. 1994, 6, 4, 516–524Publication Date (Print):April 1, 199…
The cysB gene of Klebsiella aerogenes has been cloned, sequenced and shown to complement the cysteine auxotrophic phenotype of Escherichia coli cysB mutants. The K. aerogenes cysB gene is predicted to encode a protein of 324 amino acid residues that shares approx. 95% sequence similarity with the Salmonella typhimuriu…
We have studied the influence of fabric structure on the stick-slip motion of dynamic frictional force. Autospectral density function analysis demonstrates that the nature of stick-slip motion is periodic and depends on fabric construction. Warp, weft density, and yam irregularity affect stick-slip data and can be obj…
Electrochemical anodization of graphite in trifluoroacetic media, when performed with a sufficiently high current density, leads to exfoliation of graphite. This reaction has been studied using X-ray diffractometry, A.C Impedance Spectroscopy and gas analysis in various experimental conditions. A mechanism is proposed…
Abstract The accessibility of cellulose samples with different supermolecular structure during deuteration has been studied by NMR. It has been established that the content of accessible regions is higher than the content of amorphous regions determined by the X‐ray method. A modified crystalline–amorphous model of ce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing-Opening Polymerization of Octamethyltetrasila-1,4-dioxane, 2D2. 2. Cyclic Oligomer Formation and Mechanism of the ReactionJulian Chojnowski and Jan KurjataCite this: Macromolecules 1994, 27, 8, 2302–2309Publication Date (Print):April 1, 1994Publication History Published…
Abstract The structure of β -Si 3 N 4 was reinvestigated with X-ray powder diffraction and Rietveld refinement to determine if the space group should be centrosymmetric, P 6 3 / m , or acentric, P 6 3 . Displacement for one sort of the nitrogen atoms N(1) away from the high-symmetry positions are found to be even larg…
The grafting of CrC4 2- and Cr2O7 2- oxometalates has been evidenced on [Cu-Cr] layered double hydroxides by a PXRD study under moderate heating and by Infrared spectroscopy.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPalladium Complexes with the Tridentate Dianionic Ligand Pyridine-2,6-bis(thiocarboxylate), pdtc. Crystal Structure of (n-Bu4N)[Pd(pdtc)Br]Pablo Espinet, Cristina Lorenzo, Jesus A. Miguel, Claudette Bois, and Yves JeanninCite this: Inorg. Chem. 1994, 33, 9, 2052–2055Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of End-Functionalized Polystyrene on Model Textured SurfacesN. Singh, A. Karim, F. S. Bates, M. Tirrell, and K. FurusawaCite this: Macromolecules 1994, 27, 9, 2586–2594Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published in…
The laser-induced fluorescence spectrum of LiLuF(4):Pr(3+) single crystals, pumped by an F(2) pulsed-discharge molecular laser at 157 nm, was obtained in the VUV and UV regions of the spectrum at room temperature. A number of new fluorescence peaks were observed for the first time to our knowledge. They were assigned…
Abstract A synergistic mechanism for the retention of organic and inorganic pollutants in clays is discussed in this paper. The mechanism of adsorption of cis- or trans- 1,2-dichloroethylene vapor (CDE or TDE, respectively) by hydrated smectite clay (hectorite) exchanged with Pb 2+ , Hg 2+ , Cd 2+ , Ca 2+ , Ag + , or…
A textile made up of an organic-inorganic hybrid fibre containing 70% cellulose and 30% silicic acid was used as a raw material for the preparation of the thermostable support for combustion catalysts. The hybrid textile was burnt to obtain a pure knitted silica fibre. The surface area and crystallinity of this fibre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoelectrochemical Investigations on Naphthalocyanine Derivatives in Thin FilmsHisao Yanagi, Yoshihiro Kanbayashi, Derck Schlettwein, Dieter Woehrle, and Neal R. ArmstrongCite this: J. Phys. Chem. 1994, 98, 17, 4760–4766Publication Date (Print):April 1, 1994Publication His…
Abstract The mechanisms of thermal degradation of poly(ether‐ketone) (PEK) and four poly(ether‐ketone)/poly(ether‐sulfone) copolymers (PEK/PES) have been investigated by direct pyrolysis‐mass spectrometry (DPMS). Several families of pyrolysis compounds with H, OH and CHO end‐groups have been identified in the pyrolysi…
The density; molar volume; thermal expansion coefficient; dissolution rate in water, HC1, and NaOH; glass transition and crystallization temperatures; and the absorption edge in the ultraviolet‐visible and infrared were measured for PbO─BiO1.5─GaO1.5 glasses. The range of compositions investigated was x PbO (100 − (x…