Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled electron transfer between cyclodextrin-sandwiched porphyrin and quinonesYasuhisa Kuroda, Mitsuru Ito, Takashi Sera, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1993, 115, 15, 7003–7004Publication Date (Print):July 1, 1993Publication History Published online1 M…
The thermal decomposition of lanthanum(IIl) and cerium(IV) chelates of dibenzoylmethane anthranilic acid was studied by TG. The mechanism of the decomposition reactions were found to be random nucleation as established from TG data. Activation energies, E, pre-exponential factors, A, entropy of activation, ΔS, orders…
ABSTRACT Sorption characteristics, rates and capacities of polymeric adsorbents (XAD‐4, XAD‐7, XAD‐16, Duolite ES‐865, Duolite S‐761, Porapak‐Q and XUS‐43436) for ethyl butyrate and octanal were determined using model solutions. Sorption of these two principal components of aqueous orange essence, was evaluated utiliz…
Fracture Toughness of HIP-sintered silicon nitride decreased with increasing temperature up to 1200°C. The brittle-to-ductile transition was observed in the temperature range from 1200°C to 1275°C: the fracture toughness rapidly increased in the transition region. Above the transition temperature, the fracture toughne…
Effects of alloying on the anodic polarization of a low interstitial, 18% chromium (Cr) ferritic stainless steel in sulfuric acid (H2SO4) were examined. Vanadium (V) from 1 to 4% was added alone and with up to 1.5% nickel (Ni), silicon (Si), copper (Cu), and molybdenum (Mo). The carbon (C) and nitrogen (N) level varie…
The blown film process is a complex manufacturing process in which film properties are found to be greatly influenced by the fabrication vari ables from which the film was produced. This article will focus on the control of these variables to demonstrate the methods of process control used for op timization of film pr…
Natural (molybdenite) and synthesized molybdenum disulfide crystals have been studied by high-resolution transmission electron microscopy. The image simulation demonstrates that the [0001] and [0110] HRTEM images of hexagonal and rhombohedral MoS2 crystals hardly disclose their stacking sequences, and that the [2110]…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of large polar side groups on the glass transition temperature of acrylic copolymersAlberto Gallardo and Julio San RomanCite this: Macromolecules 1993, 26, 14, 3681–3686Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBicyclo[3.2.2]non-1-ene: matrix isolation and spectroscopic characterization of a moderately strained bridgehead olefinMurthy S. Gudipati, Juliusz G. Radziszewski, Piotr Kaszynski, and Josef MichlCite this: J. Org. Chem. 1993, 58, 14, 3668–3674Publication Date (Print):July 1…
Abstract The most effective chemical blowing agents for producing cellular rubber products are ADCA, activated forms of ADCA, OBSH and DNPT. Blends of ADCA types and OBSH are also used quite extensively. These blowing agents may be used to make automotive weatherstripping, various types of athletic padding, insulation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProbing the role of lysine 16 in ras p21 protein with unnatural amino acidsHyun Ho Chung, David R. Benson, and Peter G. SchultzCite this: J. Am. Chem. Soc. 1993, 115, 14, 6414–6415Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published in…
Abstract This paper describes the effect of three natural zeolite-containing pozzolanic admixtures on expansion of mortar bars caused y alkali-silica reaction (ASR). Heulandite is present in all three samples, and clinoptilolite may be also present in one sample. Silica is also present in all three samples, but the mi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic model for tensile deformation of polymers. 5. Effect of temperature on orientation efficiencyYves Termonia and Paul SmithCite this: Macromolecules 1993, 26, 15, 3738–3741Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inis…
Eight individuals with an unusual dwarfing skeletal dysplasia have been investigated in a remote rural area in Northern Zululand, South Africa. These dwarfed individuals are members of a community numbering some 10,000 persons; approximately 20% have a degenerative arthropathy affecting mainly the major joints of the…
Photoluminescence studies have been carried out on several amorphous poly(p-phenylene sulfide) (PPS) films using a frequency-tripled pulsed Nd:(yttrium aluminum garnet) laser at 355-nm wavelength. The main luminescence is attributed to the ${\mathrm{\ensuremath{\pi}}}^{\mathrm{*}}$\ensuremath{\rightarrow}\ensuremath{\…
We report the results of precise x-ray- and neutron-scattering experiments on lead phosphate in the critical-temperature region of the ferroelastic transition. These results show the existence of anomalous incommensurate satellite reflections above ${\mathit{T}}_{\mathit{c}}$, where the incommensurability changes from…
This article examines the changes in interparticle forces brought about on prolonged contact (1 year period) of a bentonite clay with artificial seawater. The study is undertaken with the purpose of identifying the physico‐chemical factors that impart a nonswetling character to smectite clays deposited in marine envir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer diffusion in semicrystalline polymers. 1. Poly(ether imide)/poly(aryl ether ketone ketone)Steven R. Lustig, John G. Van Alsten, and Benjamin HsiaoCite this: Macromolecules 1993, 26, 15, 3885–3894Publication Date (Print):July 1, 1993Publication History Published onlin…
Alumina films which were anodized in a sulfuric acid solution were studied optically and chemically to verify the presence of unoxidized aluminum in the films. We extracted metallic aluminum from anodic alumina films by using bromine methanol and detected unoxidized aluminum successfully. The volume ratio of unoxidize…
Fixation of the ammonium ion (NH4 +) by clay minerals is an alternate way of building the nitrogen (N) pool in soil to optimize N crop recovery and minimize losses. Clay minerals (illite, montmorillonite, and vermiculite) and an illitic Portnoeuf soil were used to compare NH4 + fixation abilities. Total N determinatio…