Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew classes of monomeric and dimeric square-planar chromium(II) aryloxides: syntheses and structuresJilles J. H. Edema, Sandro Gambarotta, Fre Van Bolhuis, Wilberth J. J. Smeets, and Anthony L. SpekCite this: Inorg. Chem. 1989, 28, 7, 1407–1410Publication Date (Print):April…
To preserve more or less the gels textural properties during their drying step three main methods can be applied which differ roughly by the temperature and pressure range in which they are conducted. In increasing temperatures and pressures ranking one may distinguish : i) the freeze drying process giving "cryogels"…
Ultrasonic velocities at 10 MHz have been measured in two series of lithium, sodium, and potassium phosphomolybdate glasses with two fixed P 2 O 5 concentrations. Elastic moduli, Poisson's ratio, and Debye temperature have been calculated. The composition dependence of most of the properties of lithium glasses exhibit…
Abstract EXAFS and Mössbauer data on synthetic silver-rich tetrahedrite, (Cu, Ag) 10+x Fe 2−x Sb 4 S 13 , reveal the presence of Fe 2+ and Fe 3+ the former occupying trigonal planar sites and the latter tetrahedral sites. There is also a clear relationship between increased silver substitution and an increase in Fe 2+…
The effect of some transition and heavy metal cations on the dissolution of aluminum has been investigated in neutral and acid Cl − solutions by potentiodynamic polarization, gravimetric and thermometric measurements, and surface examination by SEM. At low cation concentrations, deposition of the metals corresponding…
A survey of the data available from the literature was conducted in order to assess major trends in insulator performance with altitude. The literature comprised tests on individual insulator strings both under natural and artificial conditions along with actual live-in performance. The major trends reported here sugg…
Abstract Aqueous Al passes from octahedral to tetrahedral coordination over a narrow pH interval, or threshold. This interval is 5.5–6.5 at 25°C and shifts to lower pH as temperature increases. The concentration of aqueous tetrahedrally coordinated Al is a quasi-step function of the solution pH, and, by the mass-actio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic reactions of rhodium octaethylporphyrin species in pyridine. Heterolytic cleavage of [(OEP)Rh]2 and metalloanion activation of carbon monoxideBradford B. Wayland, Kenneth J. Balkus Jr., and Maria D. FarnosCite this: Organometallics 1989, 8, 4, 950–955Publicati…
A comparative study was performed of the essential oil extracted from the fruiting apex of Bupleurum gibraltaricum Lamarck (Umbelliferae) collected in different areas within the province of Granada, including the Cázulas mountains, the Balcón de Canales and the Quéntar Reservoir. All three essential oils were very sim…
Abstract Layer charge and cation-exchange characteristics of weathered biotite isolated from a Gray Luvisol in Saskatchewan showed that this product was a high-charge vermiculite. Cation-exchange capacity (CEC) of the sand-size (100–250 μ m) weathered biotite particles from different horizons, as determined by a 30-mi…
The organic charge-transfer (CT) complexes that have a mixed-stack structure, in which organic electron donors and electron acceptors stack alternately plane to plane, such as perylene/tetracyanoethylene, showed larger third-harmonic generation than poly-(2,4-hexadiyn-1,6-diol-bis(p-toluenesulfonate), which is known a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagneto-structural correlations and metal-metal bonding in exchange-coupled nonahalodimolybdate (A3Mo2X9; X = chlorine, bromine, iodine) complexesRobert Stranger, Peter W. Smith, and Ian E. GreyCite this: Inorg. Chem. 1989, 28, 7, 1271–1278Publication Date (Print):April 1, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacroscopic ordering of liquid-crystalline polymers with discotic mesogensB. Hueser, T. Pakula, and H. W. SpiessCite this: Macromolecules 1989, 22, 4, 1960–1963Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989h…
Abstract The gas transport and other pertinent properties of three aromatic polyesters, made by reacting phenolphthalein with terephthaloyl chloride (PPha‐tere), 50:50 terephthaloyl and isophthaloyl chlorides (PPha‐50:50), and isophthaloyl chloride (PPha‐iso), are reported. The glass transition temperatures of PPha‐te…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of monomers containing functional silyl groups. 6. Anionic polymerization of 2-(trialkoxysilyl)-1,3-butadieneKatsuhiko Takenaka, Takashi Hattori, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1989, 22, 4, 1563–1567Publication Date (Print):April 1,…
A model is proposed in which protons fluctuate between neighboring atomic shells either by thermal activation or by a tunneling process. The transition probability of the protons depends on the distance between the adjacent atoms. The characteristic pair distribution function of interatomic distances in the amorphous…
The plastic behaviour of α-Ti single crystals with a very low impurity content has been studied at temperature between 4 and 300 K. Comparison with previous results is made. This study shows that the low-temperature plastic behaviour of α-Ti is controlled by lattice friction. The importance of substitutional impuritie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnd capping of growing species of poly(2-oxazoline) with carboxylic acid: a novel and convenient route to prepare vinyl- and carboxy-terminated macromonomersMasatoshi Miyamoto, Kensuke Naka, Makoto Tokumizu, and Takeo SaegusaCite this: Macromolecules 1989, 22, 4, 1604–1607Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilver-coated fumed silica as a substrate material for surface-enhanced Raman scatteringA. M. Alak and . Vo Dinh TuanCite this: Anal. Chem. 1989, 61, 7, 656–660Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsodimorphism in synthetic poly(β-hydroxybutyrate-co-β-hydroxyvalerate): stereoregular copolyesters from racemic β-lactonesSteven Bloembergen, David A. Holden, Terry L. Bluhm, Gordon K. Hamer, and Robert H. MarchessaultCite this: Macromolecules 1989, 22, 4, 1663–1669Publicat…