Materials Literature
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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…
A review is given of research into the measurement of crystal structure-factor amplitudes and phases by transmission electron diffraction. Accuracies for amplitudes are commonly a fraction of a percent (after conversion to X-ray structure factors) while phases may now be measured in favorable cases using three-beam el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic conversion of simple haloporphyrins into alkyl-, aryl-, pyridyl-, and vinyl-substituted porphyrinsStephen G. DiMagno, Victor S. Y. Lin, and Michael J. TherienCite this: J. Am. Chem. Soc. 1993, 115, 6, 2513–2515Publication Date (Print):March 1, 1993Publication Histo…
Reported are the photophysical properties of the copper(I) halide clusters Cu4X4(dpmp)4 with the bulky organic base 2-(diphenylmethyl)pyridine (X = I, Br, Cl) which have been shown by previous crystal structure determinations to have “cubane”-like Cu4X4 cores with very similar Cu-Cu distances (2.87−3.01 Å). As solids…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNucleic acid dendrimers: novel biopolymer structuresRobert H. E. Hudson and Masad J. DamhaCite this: J. Am. Chem. Soc. 1993, 115, 6, 2119–2124Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolten salt synthesis and properties of three new solid-state ternary bismuth chalcogenides, .beta.-CsBiS2, .gamma.-CsBiS2, and K2Bi8Se13Timothy J. McCarthy, Stanley Pierre Ngeyi, Ju Hsiou Liao, Donald C. DeGroot, Tim Hogan, Carl R. Kannewurf, and Mercouri G. KanatzidisCite…