Materials Literature
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Abstract By mixing Zntpp solid with o-chloranil, the rectification and photovoltaic properties of Al/porphyrin/Au sandwich-type cell are improved (Zntpp: 5, 10, 15, 20-tetraphenylporphyrinatozinc). The improvement may be mainly attributable to an increase in the hole concentration as the majority carrier because of th…
The sound velocities of the longitudinal and transverse vibrational modes in various directions have been measured by Brillouin scattering on high-quality twin-free single crystals of tetragonal PbTiO3. By using these velocities and the dielectric permittivity measured by the impedance method, a complete set of coeffi…
ABSTRACT: We consider stress relaxation in a strongly segregated lamellar mesophase, where block copolymers are in the “brush ” state with junction points confined to the interface between the adjacent lamellae and blocks stretched out away from it. If the molecular weight of the blocks is large enough, they entangle…
The valence of iridium in anodic iridium oxide films has been determined by x‐ray absorption spectroscopy and varies between 3.0 and 4.8 in a voltammogram cycle. When the valency starts to increase the first coordination shell around an iridium ion begins to shrink from 0.203 at to 0.191 nm at . At the same time a str…
The theory of the anomalous flow behaviour of Ll2 compounds has developed over the last 30 years. This theory has a foundation in the early estimates of the crystallographic anisotropy of antiphase-boundary (APB) energy in these compounds. In spite of this critical aspect of the theory, it is only in the last 5 years…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of (R)-poly(.beta.-hydroxybutyrate)-poly(.epsilon.-caprolactone) and (R)-poly(.beta.-hydroxybutyrate)-poly(lactide) degradable diblock copolymersMichael S. Reeve, Stephen P. McCarthy, and Richard A. GrossCite this: Macromolecules 1993, 26, 5,…
Chitosan is a novel biopolymer with numerous industrial, food, and biomedical applications. Our studies examined the production of chitosan from mycelia of Absidia coerulea, Mucor rouxii, Gongronella butieri, Phvcomyces blakesleeanus and Absidia blakesleeana. In batch culture, strains were screened to determine the fa…
In this study, we prepared a homologous series of dimeric compounds, di-BB-n These compounds have two mesogenic groups linked by a flexible methylene spacer and so can be regarded as model compounds for main chain liquid crystalline BB-n polyesters. In this dimeric system, we observed distinct odd-even effects in whic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous solution properties of ampholytic copolymers prepared in microemulsionsJean Marc Corpart and Francoise CandauCite this: Macromolecules 1993, 26, 6, 1333–1343Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March…
Introduction of nitrogen into zirconia creates oxygen vacancies in the anion sublattice as required by charge neutrality when N 3− replaces for O 2− in the structure, being similar to those obtained by lower valency cation substitution for zirconium. There is no essential structural difference between the cation‐relat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of chain pull-out on adhesion of elastomersHugh R. BrownCite this: Macromolecules 1993, 26, 7, 1666–1670Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://doi.org/10.1021/ma00059a027RIGHTS & PERMI…
Six Co-substituted magnetites ${\mathrm{Co}}_{\mathit{x}}$${\mathrm{Fe}}_{3\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{O}}_{4}$, with x\ensuremath{\le}0.04 have been studied by $^{57}\mathrm{Fe}$ M\"ossbauer spectroscopy at temperatures T between their respective Verwey transition and \ensuremath{\approxeq}900 K. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of predominantly syndiotactic poly(.beta.-hydroxybutyrate) by the tributyltin methoxide catalyzed ring-opening polymerization of racemic .beta.-butyrolactoneJohn E. Kemnitzer, Stephen P. McCarthy, and Richard A. GrossCite this: Macromolecules 1993, 26, 6, 1221–12…
Electrochemical metal shaping and finishing processes involve anodic dissolution of metals at high rates. This paper presents a review of some fundamental aspects related to the understanding of such processes. Included are discussions of the phenomena of passive film breakdown that lead to the transpassive dissolutio…
Stents are tubular devices that are used in cylindrical passages of the body following trauma or disease in order to keep the cross section of these passages open. A mathematical model of a self-expanding metallic stent has been developed with the aim of predicting various geometrical and mechanical properties of the…
We have obtained the scanning tunneling microscopy (STM) images and scanning tunneling spectroscopy (STS) data with atomic-scale resolution for a SrTiO 3 (100) surface annealed in ultrahigh vacuum (UHV) at 1200°C. A √5×√5- R 26.6° surface superstructure indicating oxygen vacancy ordering has been observed. The STS dat…
Abstract High‐molecular‐weight copolymers of L , L ‐lactide with ε‐caprolactone were synthesized using initiators containing aluminium and zinc, i.e., AlEt 2 OEt, ZnEtO i Pr, Al(acac) 3 and AlEt 3 + ZnEt 2 + H 2 O. The chain microstructure was revealed to vary from random to diblock arrangement, depending on temperatu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure/temperature phase diagram of hexanitrohexaazaisowurtzitaneT. P. Russell, P. J. Miller, G. J. Piermarini, and S. BlockCite this: J. Phys. Chem. 1993, 97, 9, 1993–1997Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue…
The problem addressed in this paper concerns the statistical characterization of the state of residual stress generated in polycrystalline ceramics during cooling from the fabrication temperature. Detailed finite element simulations are carried out for an ensemble of large numbers of randomly oriented, planar hexagona…
Abstract A calibration procedure has been developed for XPS instrument intensity scales. The calibration is achieved by measuring the spectrum for reference foils of Ag, Au and Cu for which the true spectrum has been measured usng the metrology spectrometer . The ratio of the measured and reference spectra at 1 eV int…