Materials Literature
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Abstract 13 C‐NMR spectra of ring carbons and O‐acetyl carbonyl carbons of cellulose acetate (CA) in dimethyl sulfoxide‐d 6 were analyzed. The CA samples with the degree of substitution (DS) ranging from 0.84 and 1.91 were prepared by homogeneous acetylation of cellulose with acetic anhydride in a 10% LiCl/dimethyl ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond dynamics of photochemical electron transfer in porphyrin-quinone intramolecular exciplex systemsNoboru Mataga, Akiya Karen, Tadashi Okada, Shinji Nishitani, Nobuyuki Kurata, Yoshiteru Sakata, and Soichi MisumiCite this: J. Phys. Chem. 1984, 88, 22, 5138–5141Public…
The mechanism for the production of the S2 state fluorescence following the excitation to the S1 states of zinc (II)-tetraphenylporphin has been investigated by using two-photon absorption and optical–optical double resonance techniques. The main process populating the S2 state is found to be a stepwise two-photon abs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence of tris(2,2'-bipyridine)ruthenium(II) in aqueous clay minerals suspensionsRobert A. Schoonheydt, Paul De Pauw, Dominique Vliers, and Frans C. De SchrijverCite this: J. Phys. Chem. 1984, 88, 21, 5113–5118Publication Date (Print):October 1, 1984Publication History…
In the normal paradigm of sintering‐densification, grain growth, creep, etc., it is anticipated that, at extremely fine grain size, various phenomena will be exaggerated so as to make direct observation more tractable; this gives impetus to attempts to synthesize such fine‐grained materials. In the present case, 6‐nm…
Abstract E‐Urocanic acid exhibits a single, featureless, long‐wavelength absorption band with λ max ˜258 nm in water. However, the quantum efficiency for E→Z photoisomerization is wavelength dependent in this region, with the maximum value at the low energy edge of the band (e.g. 313 nm) and appreciably lower efficien…
A light-harvesting pigment-protein complex was isolated from the diatom Phaeodactylum tricornutum using the zwitterionic detergent CHAPS (3-[3-cholamidopropyl)dimethylammonio]-1-propanesulfonate). Detergent-solubilized membranes were fractionated by sucrose density gradient centrifugation into three components. The me…
Electronic as well as localized and delocalized vibrational losses were studied on ${\mathrm{TiO}}_{2}$(110) by electron-energy-loss spectroscopy. Electronic loss features at defect surfaces around 0.8 eV indicate band-gap defect states. In the higher loss-energy range above 3 eV well-known interband transitions were…
The nucleation and growth of Si 3 N 4 from a carbon‐Si0 2 mixture in an N 2 atmosphere at 1400°C was studied by varying the specific surface area, particle size, and distribution of the Si0 2 and carbon. Si 3 N 4 yield increased and particle size decreased with increasing Si0 2 and carbon specific surface area. Manner…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-support interactions on rhodium and platinum/titanium dioxide model catalystsD. N. Belton, Y. M. Sun, and J. M. WhiteCite this: J. Phys. Chem. 1984, 88, 22, 5172–5176Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue…
The thermal evolution of the equilibrium shape of an fcc crystal with both first- and second-nearest-neighbor interatomic interactions is studied. Exact zero-temperature calculations are extended to nonzero temperatures by use of solid-on-solid models appropriate to 001> and 110> directions in the crystal, yield…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of a carbon analog of iodosylbenzene with iron porphyrins: isolation and x-ray structure of an iron(II) complex with O-C-C moieties inserted between two trans iron-nitrogen bondsDaniel Mansuy, Jean Paul Battioni, Irena Akhrem, Daniel Dupre, Jean Fischer, Raymond Wei…
Abstract The far infrared and submillimeter dielectric function of sodium nitrite single crystal are determined by means of precise transmission spectroscopy (8 to 17 cm −1 ) and reflection spectroscopy (10 to 600 cm −1 ) over the temperature range 20 to 230 °C for the a and c crystallographic directions. All the infr…
A Perfectly Stirred Reactor model, kinetic rate data, and equilibrium adiabatic flame temperatures have been incorporated into a closed form NOx prediction algorithm. The algorithm accounts for combustor inlet parameters and steam injection. Combining this model with the operating map for the gas turbine allows predic…
The cold-working effect on the average magnetic interaction ($\overline{J}$), the spontaneous magnetization at 0 K (${M}_{0}$), and the magnetic transition temperature (${\ensuremath{\Theta}}_{m}$) in the Heusler alloys is formulated by means of dislocation theory with consideration of ferromagnetic and antiferromagne…
A new DSC method is used to study a smectic A to nematic transition. The measurement of the height of the DSC transition peak gives the order of the transition. The smectic A to nematic transition of octyl cyanobiphenyl was found to be second order while the same transition was found to be first order for nonyl cyanob…
A modification of the Rietveld refinement program is introduced by replacing the Gaussian profile function with a Voigtian. The performance of the program is tested by an application to simulated and measured diffraction patterns of NaTaO 3 , and excellent results are obtained when the tails of the reflections are inc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyurethane Interpenetrating Polymer-Networks (IPN's) synthesized under high pressure. 2. Morphology and Tg behavior of polyurethane-polystyrene IPN'sDoo Sung Lee and Sung Chul KimCite this: Macromolecules 1984, 17, 10, 2193–2196Publication Date (Print):October 1, 1984Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA "closed" bridging stibinidene complexAlan H. Cowley, Nicholas C. Norman, and Marek PakulskiCite this: J. Am. Chem. Soc. 1984, 106, 22, 6844–6845Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 October 1984https://pub…
Improved empirical methods for the prediction of perforation of reinforced concrete barriers by missiles produced by turbine fracture are developed. Data from recent turbine missile tests and existing empirical methods of perforation damage analysis were collected and compared. Selected formulas were chosen for improv…