Materials Literature
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The development of toughened ceramics over the past 10 to 15 years is arguably one of the most important materials breakthroughs of this century. Monolithic and composite ceramic materials having fracture toughnesses up to an order of magnitude higher than those available 20 years ago have been produced using technolo…
In Substanz explosiv ist der Bis(η 2 ‐peroxo)‐Komplex 1 , der in Lösung die aktive Spezies bei der Epoxidation von Olefinen mit [CH 3 ReO 3 ] ist und als Diglyme‐Addukt 2 auch röntgenstrukturanalytisch charakterisiert werden konnte. Unter Katalysebedingungen (H 2 O 2 ‐Überschuß) ist 1 ungleich beständiger als im freie…
Abstract It has been realized during the last 5 years that quantitative surface analyses by Auger electron spectroscopy (AES) and x‐ray photoelectron spectroscopy (XPS) can be greatly complicated by the effects of elastic electron scattering. These effects had previously been largely ignored. We review here the effect…
We present direct evidence of dynamical diffraction of x rays from a quasicrystal. High-resolution x-ray-diffraction measurements of the Al-Pd-Mn face-centered icosahedral quasicrystal were performed, revealing a mosaic full width at half maximum of less than 0.001\ifmmode^\circ\else\textdegree\fi{}. In a second exper…
Measurements have been made on the effects of a thin layer of polystyrene-poly(methyl methacrylate) diblock copolymer on the toughness of the interface between poly(methyl methacrylate) and poly(phenylene oxide). For a wide range of copolymer molecular weights, provided the interface is not saturated with copolymer, t…
Abstract The selection and control of fire retardant polymers for most current applications is made by a prescriptive approach supported by standard tests. There is now much international interest and commitment to new fire safety strategies based on fire safety engineering. This paper outlines some of the issues whic…
The synthesis of total cellular proteins in Escherichia coli K12 was studied in batch culture following exposure of cells to low concentrations of monochlorophenol, pentachlorophenol and cadmium chloride. Changes in protein patterns were identified after pulse-chase labelling of proteins with [35S]methionine and subse…
Gc-ms and hplc have been employed to identify 5-hydroxy-L-norvaline (L-2-amino-5-hydroxypentanoic acid) in the culture fluids of pyridoxine-starved cultures of two pyridoxine auxotrophs of Escherichia coli B. The production of 5-hydroxynorvaline is shown to be secondary to pyridoxine starvation of the cultures, and th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of a ring polymer onto a surfaceEdmund A. Di MarzioCite this: Macromolecules 1993, 26, 17, 4613–4616Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993https://pubs.acs.org/doi/10.1021/ma00069a030http…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDegradation mechanisms of poly(vinyl fluoride) filmsWilliam E. Farneth, Mark T. Aronson, and Ronald E. UscholdCite this: Macromolecules 1993, 26, 18, 4765–4769Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993…
Abstract Nickel‐cobalt and nickel‐iron electrodeposits were characterized as hydrogen electrodes in alkaline water electrolysis (6 mol/L KOH, 25°C). The nickel‐based codeposits were fabricated with different bath compositions and at different current densities. The hydrogen evolution in water electrolysis on the nicke…
Abstract Polynaphthoylenebenzimidazoles, copolynaphthoylenebenzimidazolophenylquinoxalines and copolynaphthoylenebenzimidazolonaphthylimides were obtained by high‐temperature catalytic polycyclocondensation in phenolic solvents. All polymers obtained demonstrate high oxygen index values depending on polymers structure…
This text presents the basic physical properties of crystalline solids and device structures such as p-n junctions and quantum wells. Emphasis is on simple explanations of basic physical theory and application rather than a detailed analysis of complex devices and fabrication technology.
Abstract A self-supporting, multilayered film which was prepared from an aqueous dispersion of montmorillonite and orthophosphoric acid (H3PO4) remained intact even in hot water and maintained the ion exchange capacity similar to that of the original montmorillonite powder. An ammonium surfactant (CTAB) was intercalat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvidence for reentrant structural-phase transition in DCNQI-copper systemHayao Kobayashi, Hiroshi Sawa, Shuji Aonuma, and Reizo KatoCite this: J. Am. Chem. Soc. 1993, 115, 17, 7870–7871Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Publi…
Abstract The future aspects of Nitrogen based flame retardants in Nitrogen containing polymers are promising, as they contain no other chemical element than already present in the polymers. Sucessful applications are: * Melamine in Combustion Modified High Resilient Foam * Melamine in B‐1 rigid foam * Melamine Cyanura…
The title compound is monoclinic, P2 1 /c with a=7.813, b=7.061, c=13.775A, β=93.71°, and Z=4. Its structure has been refined to an unweighted residual of 0.041 using 1440 reflections. Moctezumite possesses a layer structure parallel to (001). In each layer, U-coordination pentagonal bipyramids form zigzag chains para…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline polymers in good nematic solvents: free chains, mushrooms, and brushesD. R. M. Williams and A. HalperinCite this: Macromolecules 1993, 26, 16, 4208–4219Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHole transport in 5'-[4-[bis(4-ethylphenyl)amino]phenyl]-N,N,N',N'-tetrakis(4-ethylphenyl)-1,1':3',1''-terphenyl-4,4''-diamineM. Van der Auweraer, F. C. De Schryver, P. M. Borsenberger, and J. J. FitzgeraldCite this: J. Phys. Chem. 1993, 97, 34, 8808–8811Publication Date (Pr…
Series of sequences of SEM micrographs are presented to elucidate species-specific shell features in larval and post-larval stages of four Ostreidae (Bivalvia) species ( Crassostrea gigas (Thunberg), C. virginica (Gmelin), Ostrea edulis L., and O. equestris Say). The diagnostic characters, including hinge structure, s…