Materials Literature
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Processes for radiative and nonradiative decays of the most important emitting levels 5D0, 5D1, and 5D2 of the europium ion doping KY3F10 are investigated. Both magnetic and electric dipole transition probabilities are calculated for the transitions between Stark levels. The ’’forbidden’’ transitions are discussed. Fr…
During the γ-irradiation and UV-light photolysis of polyvinyl chloride) (PVC), free radicals are formed which may be detected by electron spin resonance (ESR) spectroscopy. In this paper interpretations of the ESR spectra and decomposition mechanisms of PVC are presented.
Abstract A crystal field analysis of the reported optical spectra of Nd 3+ in the series of aluminium and gallium garnets LuAG, YAG, GGG, LuGG, and YGG is presented. The reliability of the crystal field parameters determined in this way is confirmed by comparison with ESR g ‐values given in the literature. The results…
Abstract Ribbon‐like lamellar single crystals of cellulose II are grown from dilute aqueous solution of cellulose triacetate (number‐average degree of polymerization (DP)‐15) by deacetylation and consequent precipitation. The best results are obtained with methylamine as the deacetylation reagent at 90°C. Electron dif…
Dynamic mechanical properties of poly(methyl methacrylate) (PMMA) filled with mica flakes (M) or glass beads (G) were investigated as functions of particle size and filler concentration. With increasing particle size, dynamic modulus E′ slightly decreases for system G, while it increases rapidly at first and then appr…
The sound velocities in perovskite-type CsPbCl 3 were measured around the three successive structural phase transition points at 37, 42, and 47°C using the ultrasonic pulse-overlap method. "Detwinned" samples were used, so that the measured velocities can be connected with the elastic constants in each phase. The resu…
Quantitative X‐ray diffraction and microscopy were used to study the morphology development and overall crystallization rate between 900° and 990°C of MgO‐Al 2 O 3 −SiO 2 glasses with added ZrO, TiO 2 , CaF 2 , or CeO 2 . Three basic stages of micro‐structural development were distinguishable: I, an induction period,…
Abstract The pH at the zero point of charge (ZPC) has been used to characterize the electrochemical properties of soils. To date, most studies have focussed on soils high in oxides with low phyllosilicate content. The study reported here attempts to use ZPC determinations to characterize the surface charge characteris…
The low-temperature (2-100 K) polycrystalline magnetic properties of V ( a ~ a c )M~ ,n ( a ~ a c )a~n,d Mn(trop)3 are reported [Hacac = 2,4-pentanedione and Htrop = tropolone]. For V(acac), the zero-field splitting (D) is 7.7 cm-', gI1 = 1.96 and g , = 1.78, all compatible with the reinterpreted optical spectrum. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of coordination compounds. A joint NQR and x-ray investigation of trialkylphosphine-gallium trichloride adductsJohn C. Carter, Gerard Jugie, Renee Enjalbert, and Jean GalyCite this: Inorg. Chem. 1978, 17, 5, 1248–1254Publication Date (Print):May 1, 1978Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculated γ Effects on the 13C-NMR Spectra of 3,5,7,9,11,13,15-Heptamethylheptadecane Stereoisomers and Their Implications for the Conformational Characteristics of PolypropyleneAlan E. TonelliCite this: Macromolecules 1978, 11, 3, 565–567Publication Date (Print):May 1, 197…
Four of the problems deal with the mechanics of bubble production and bursting, and the collection and sizing of jet drops; three concern the transfer of the bacterium Serratia marcescens from bursting bubbles to jet drops. The problem of producing bubbles of a specified size from glass capillary tips is overcome by p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntersystem crossing observed by ultrasonic relaxation of the singlet-quintet spin equilibrium of iron(II) complexes in solutionJames K. Beattie, Robert A. Binstead, and Robert J. WestCite this: J. Am. Chem. Soc. 1978, 100, 10, 3044–3050Publication Date (Print):May 1, 1978Pu…
Abstract The complexation of homogeneous polyethylene glycols and their dimethyl ethers(glymes) with alkali and alkaline-earth metal cations was studied by PMR spectroscopy on the basis of a comparison with crown ethers. The ethylene proton signal of octaethylene glycol in methanol-d4 was split into three lines by the…
Abstract Filaments of polypropylene having remarkably high strength and modulus have been prepared by the two‐stage drawing process of Clark and Scott (4). In the first stage, un‐oriented extruded billet is rapidly drawn to the natural draw ratio of ca 7X in hot silicone oil. The second stage of draw, a post neck draw…
Abstract Using the cluster approximation, a detailed semi‐empirical molecular orbital calculation is reported for computing the energy levels of Cu + luminescent centres in NaCl and LiCl. Excited states energies are obtained on the basis of 3d 9 4s configuration of Cu + , including spin–orbit interaction. Excitation a…
Abstract The electrodic polymerization on graphite fibers of a variety of monomers having different types of functional groups has been investigated. In addition to vinyl polymerization, some novel polymerizations of cyclic functional groups have been conducted under appropriate polymerization conditions. In many inst…
Results of high resolution secondary electron observations of the haemocyanin molecule from the marine whelk Buccinum undatum are given. The choice of metal used for surface coating of the sample (gold, gold--palladium or carbon/gold--palldium) and the mode of application of this metal (thermal vacuum evaporation or d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular orbital study of the vibrational frequencies and resonance Raman intensities of biphenyl negative ionsSatoshi Yamaguchi, Nobuaki Yoshimizu, and Shiro MaedaCite this: J. Phys. Chem. 1978, 82, 9, 1078–1080Publication Date (Print):May 1, 1978Publication History Publis…
Yutaka Tokiwa, Tomoo Suzuki; Hydrolysis of Polyesters by Rhizopus delemar Lipase, Agricultural and Biological Chemistry, Volume 42, Issue 5, 1 May 1978, Pa