Materials Literature
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Yttria‐doped zirconium oxide was prepared in the fully tetragonal, mixed tetragonal and cubic, and the fully cubic phases by varying the yttria conent. The fracture toughnesses of the materials were 11.6, 8.7, and 2.5 Mpa · m½, respectively. The wear resistance, measured in air at room temperature in slow sliding (1 m…
Indium tin oxide films have been deposited by rf sputtering an oxide target (90% In2O3+10% SnO2). Transparent conducting films have been obtained on room-temperature substrates without any post-deposition annealing. The effects of target-substrate separation on the growth characteristics and film properties have been…
High resolution 13C NMR spectroscopy of live cells has been used to show that poly-beta-hydroxybutyrate (PHB) is predominantly in a mobile state within the storage granules of Alcaligenes eutrophus, Methylobacterium extorquens, and Methylobacterium AM1. Comparison of chemical and NMR analysis of PHB indicates that abo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTManganese(II) N,N'-dipyridoxylethylenediamine-N,N'-diacetate 5,5'-bis(phosphate). Synthesis and characterization of a paramagnetic chelate for magnetic resonance imaging enhancementScott M. Rocklage, William P. Cacheris, Steven C. Quay, F. Ekkehardt Hahn, and Kenneth N. Raym…
3,6-Diphenylpyromellitic dianhydride (DPPMDA) has been synthesized from 2,5-diphenyl-3,4-bis(4-methoxyphenyl)cyclopentadiene-1-one and dimethyl acetylenedicarboxylate. The monomer was polymerized with 11 aromatic diamines in refluxing m-cresol containing isoquinoline to afford two new series of phenylated polyimides.…
A combined resistivity transmission electron microscopy (TEM) study has been done on heavily drawn Cu-20 vol % Nb alloys (so-called in situ alloys). The results show that electron scattering at Cu-Nb interfaces makes the major contribution to resistivity in heavily drawn wire. The dislocation contribution is small and…
A molecular kinetic theory for the rheology of glass is given. According to this theory, the structure of a glass consists of randomly distributed high-energy sites, which correspond to the frozen-in density fluctuations. These sites are termed as defects. The anelastic deformation associated with the \ensuremath{\bet…
Abstract Repeated ion exchange of the ZSM-5 zeolite using aqueous copper(II) acetate solution was found to bring about excess loading of copper ions above 100% of exchange level. The catalytic activities of the resulting Cu-ZSM-5 zeolites for direct decomposition of nitrogen monoxide were very high and increased with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAttenuation lengths of photoelectrons in hydrocarbon filmsColin D. Bain and George M. WhitesidesCite this: J. Phys. Chem. 1989, 93, 4, 1670–1673Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://pub…
In situ spectroelectrochemical studies have been carried out on polyaniline films formed on a reflective platinum disk electrode in acidic media by means of near‐normal incidence reflectance spectroelectrochemical techniques. The results indicate that there are four optically different species depending on the potenti…
THE unique properties of diamond are yet to be tapped for a large number of advanced materials applications. Fascination with this king of all gemstones
Measurements of viscoelastic properties near the sol-gel transition demonstrate that viscoelastic phenomena are described by power laws. To describe these phenomena, we derive the distribution of relaxation times for branched polymers, both in the reaction bath and in the dilute solution. From this spectrum we can com…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet-singlet and triplet-triplet intramolecular transfer processes in a covalently linked porphyrin-phthalocyanine heterodimerT. H. Tran Thi, C. Desforge, C. Thiec, and S. GaspardCite this: J. Phys. Chem. 1989, 93, 4, 1226–1233Publication Date (Print):February 1, 1989Publ…
C 32 H 26 N 2 O 6 cristallise dans P1 avec affinement jusqu'a 0,078. C 36 H 34 N 2 O 6 cristallise dans P1 avec affinement jusqu'a 0,107. C 40 H 26 N 2 O 6 cristallise dans P1 avec affinement jusqu'a 0,070. C 48 H 26 N 6 O 4 cristallise dans P1 avec affinement jusqu'a 0,046
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of polydispersity in the end-grafted polymer brushS. T. Milner, T. A. Witten, and M. E. CatesCite this: Macromolecules 1989, 22, 2, 853–861Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline and thermal properties of bacterial copolyesters: poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate)Masao Kunioka, Akira Tamaki, and Yoshiharu DoiCite this: Macromolecules 1989, 22, 2, 694–697Publication Date (Print):Feb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrophosphito-bridged diplatinum chemistryD. Max Roundhill, Harry B. Gray, and Chi Ming CheCite this: Acc. Chem. Res. 1989, 22, 2, 55–61Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://pubs.acs.or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the synthesis of ortho-substituted tetraphenylporphyrinsJonathan S. Lindsey and Richard W. WagnerCite this: J. Org. Chem. 1989, 54, 4, 828–836Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February…
Recent work has rendered possible the formulation of a rigorous model for the propagation of pressure waves in bubbly liquids. The derivation of this model is reviewed heuristically, and the predictions for the small-amplitude case are compared with the data sets of several investigators. The data concern the phase sp…
Abstract Graft copolymerization of methacrylic acid (MetAc) onto potato starch using H 2 O 2 /Fe ++ redox system was investigated. The best conditions of the grafting reaction were determined and several variables were studied: initiator and monomer concentrations, time, and temperature. Percent grafting efficiency, p…