Materials Literature
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Abstract A highly reactive cadmium deposit is formed, when colloidal cadmium sulfide is illuminated in the presence of sulfite or dithionite anions (10 −4 −10 −3 M). It is oxidized by oxygen, nitrous oxide, hydrogen ions and methylviologen. The quantum yield amounts to 0.005 in the absence of excess cadmium ions. In t…
A study by band-structure methods of the boron carbide B IaC 2 is presented. All symmetry directions are considered and it is found that, in general, the valence bands are flat in almost all directions - nowhere does a band width exceed 3 eV (1 eV = 1.60 x 10 -19 J). There is slightly greater curvature in the conducti…
Abstract Highly crystalline syndiotactic 1,2‐polybutadiene ( s ‐PB) having melting point (mp) up to 216°C was obtained by using a Co(acac) 3 ‐AIEt 3 ‐CS 2 catalyst. The polymer with mp 208°C was found to have 99.7% 1,2 content and 99.6% syndiotacticity by 1 H and 13 C‐NMR measurements. The s ‐PB can be molded by addit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of cationic gold clusters with Lewis bases. Preparation and x-ray structure investigation of [Au8(PPh3)7](NO3)2.2CH2Cl2 and Au6(PPh3)4[Co(CO)4]2J. W. A. Van der Velden, J. J. Bour, W. P. Bosman, and J. H. NoordikCite this: Inorg. Chem. 1983, 22, 13, 1913–1918Public…
The pitting resistance of a series of experimental stainless steels with varying amounts of nickel, chromium, molybdenum, manganese, and nitrogen and a number of commercial stainless steels and nickel based alloys has been studied in highly concentrated chloride media. The results show that nitrogen enhances the pitti…
Abstract To test the hypothesis that berthierine in oolitic ironstones formed by diagenetic transformation of detrital kaolinite, laboratory experiments simulating the early diagenetic conditions were conducted. Representative sets of the initial sediment were prepared in distilled water and artificial seawater suspen…
The fracture toughness of three Sic‐based materials was examined and correlated to toughening mechanisms. Crack deflection along grain boundaries in hot‐pressed Sic‐Al 2 O 3 and Sic‐ZrO 2 provided notable toughness increases compared to sintered α‐Sic, which fractures trans granularly. The existence of a crack‐deflect…
Abstract Chemical and crystallochemical properties of natural dioctahedral Fe-rich smectites formed by weathering of basaltic rocks in the Berici-Euganei Area, northern Italy, were investigated. It was found that: (i) the b -dimension could be correlated both to Fe 3+ /Σ ratio (Σ = octahedral occupancy) and to dehydro…
The relationship between the thickness and thermal resistance of textile fabrics is examined with particular reference to underwear structures, and the influence of domestic washing on this relationship is demonstrated. The thermal resistance of these low density fabric constructions is determined primarily by fabric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneration of acidic sites in metal salts of heteropoly acidsT. Baba, H. Watanabe, and Y. OnoCite this: J. Phys. Chem. 1983, 87, 13, 2406–2411Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published inissue 1 June 1983https://pubs.acs.org/…
The equilibrium configurations of a liquid spreading on a rough solid surface are derived by making expansions in terms of the characteristic slope ε of the surface roughness, which is assumed to be very small. It is also assumed that the microscopic contact angle is a constant and that the liquid–air interface is pla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation, purification, and characterization of intermediate (iodosylbenzene)metalloporphyrin complexes from the (tetraphenylporphinato)manganese(III)-iodosylbenzene catalytic hydrocarbon functionalization systemJohn A. Smegal, Bruce C. Schardt, and Craig L. HillCite this:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh molecular weight linear polyethylenimine and poly(N-methylethylenimine)Ryuichi Tanaka, Isao Ueoka, Yasuhiro Takaki, Kazuya Kataoka, and Shogo SaitoCite this: Macromolecules 1983, 16, 6, 849–853Publication Date (Print):June 1, 1983Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen activation by metalloporphyrins. Formation and decomposition of an acylperoxymanganese(III) complexJohn T. Groves, Yoshihito Watanabe, and Thomas J. McMurryCite this: J. Am. Chem. Soc. 1983, 105, 13, 4489–4490Publication Date (Print):June 1, 1983Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed-valence chemistry of adjacent vanadium centers in heteropolytungstate anions. I. Synthesis and electronic structures of mono-, di-, and trisubstituted derivatives of .alpha.-octadecatungstodiphosphate(6-) ion (.alpha.-[P2W18O62]6-)Subhash P. Harmalker, Michele A. Lepar…
Describes a technique for the numerical modelling of stress wave propagation in pressure bars, using the theoretical dispersion relations. The method is applied to remove the effects of dispersion from experimental records, and pulses which show a moderate amount of dispersive distortion can be processed successfully.…
Abstract Until now there exists no calculation of the phonon density of states of amorphous SiO 2 and related materials, which could interpret the experimentally detected splittings between longitudinal and transverse modes in their optical phonon spectra. This problem is solved by taking into account the influence of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkane sonochemistryKenneth S. Suslick, John J. Gawienowski, Paul F. Schubert, and Hau H. WangCite this: J. Phys. Chem. 1983, 87, 13, 2299–2301Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published inissue 1 June 1983https://pubs.acs.org…
Effects of differential sintering kinetics due to differential green density were studied by fabricating agglomerate‐powder matrix specimens from two Al 2 O 3 /ZrO 2 (30 vol%) powders and subjecting them to a cyclic sintering schedule to allow intermittent observations. Low‐green‐density compacts sintered faster than…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of annealing and prior history on enthalpy relaxation in glassy polymers. 4. Comparison of five polymersI. M. HodgeCite this: Macromolecules 1983, 16, 6, 898–902Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published inissue 1 Jun…