Materials Literature
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Abstract At relatively high temperatures and low frequencies the electrical properties of many polymers are dominated by ionic conductivity. In cases where the glass transition is obscured by conductivity, it can be revealed by treating the data in terms of the electric modulus. The magnitude of the activation energy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron octaethyltetraazaporphyrins: synthesis, characterization, coordination chemistry, and comparisons to related iron porphyrins and phthalocyaninesJeffrey P. Fitzgerald, Brian S. Haggerty, Arnold L. Rheingold, Leopold May, and Gregory A. BrewerCite this: Inorg. Chem. 1992,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriplet and singlet energy transfer in carotene-porphyrin dyads: role of the linkage bonds.Devens Gust, Thomas A. Moore, Ana L. Moore, Chelladurai Devadoss, Paul A. Liddell, Roel Hermant, Ronald A. Nieman, Lori J. Demanche, Janice M. DeGraziano, and Isabelle GouniCite this:…
Human lymphocytes were labeled with biotinylated anti-lymphocyte-directed monoclonal antibodies, to which streptavidin and subsequently biotinylated dextran-magnetite particles were coupled. This labeling resulted in a strong and selective negative contrast enhancement of lymphocyte suspensions at 2.0 T, caused predom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereocomplex formation between enantiomeric poly(lactic acids). 5. Calorimetric and morphological studies on the stereocomplex formed in acetonitrile solutionHideto Tsuji, Suong Hyu Hyon, and Yoshito IkadaCite this: Macromolecules 1992, 25, 11, 2940–2946Publication Date (Pr…
Viscosity of Simple Soda‐Silicate Glasses, 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log 10 viscosity amounting to 0.6, those of Washburn et al. , being relatively too high. If correction for this is made, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.beta.-Halogenated-pyrrole porphyrins. Molecular structures of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetramesitylporphyrin, nickel(II) 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetramesitylporphyrin, and nickel(II) 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(pentaflu…
The spectroscopic properties, including emission spectra and lifetimes, absorption and diffuse reflectance spectra and excitation spectra, of the hexanuclear copper(I) and silver(I) clusters Cu6(mtc)6 (1), Ag6(mtc) (2), and Ag6(dtc)6 (3) (mtc = di-n-propylmonothiocarbamate, dtc = di-n-propyldithiocarbamate) are report…
TABLE 2 (continued) Complex Organic ligand(s) Ref.
The 18 vibrational modes expected from group-theoretical analysis have been obtained in the polarized Raman spectra of ${\mathrm{ZnWO}}_{4}$ single crystals. The six internal modes of the ${\mathrm{WO}}_{6}$ octahedra have been assigned. The temperature dependence of the frequencies and linewidths of the internal mode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-consistent field theories for polymer brushes: lattice calculations and an asymptotic analytical descriptionC. M. Wijmans, J. M. H. M. Scheutjens, and E. B. ZhulinaCite this: Macromolecules 1992, 25, 10, 2657–2665Publication Date (Print):May 1, 1992Publication History P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification and quantification of the "Al13" tridecameric aluminum polycation using ferronDavid R. Parker and Paul M. BertschCite this: Environ. Sci. Technol. 1992, 26, 5, 908–914Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsothermal morphology diagrams for binary blends of diblock copolymer and homopolymerKaren I. Winey, Edwin L. Thomas, and Lewis J. FettersCite this: Macromolecules 1992, 25, 10, 2645–2650Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Publis…
The conductivity relaxation phenomenon in glassy and crystalline ionic conductors has been known for many years to be a highly nonexponential process. The stretched exponential function exp-(t/\ensuremath{\tau}${)}^{\mathrm{\ensuremath{\beta}}}$ has been used with varying levels of success to describe this relaxation.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleStructural investigations of new calcium - rare earth (R) oxyborates with the composition Ca4RO(BO3)3R. Norrestam, M. Nygren, and J. O. BovinCite this: Chem. Mater. 1992, 4, 3, 737–743Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published ini…
A poly(o‐phenylenediamine)(PoPD)‐film‐coated electrode had electrochemical responses only to two halogenide ions, I − and Br − , while it had no responses to other inorganic ions examined. In this case, the film was found to be permeable to the ions. The permeability of the ions was controllable by incorporating quino…
1. Stress analysis using modern computer modelling techniques indicated that the shell should fail in tension as a result of the accumulation of stress at its inner most surface with the characteristic notched appearance of the mammillary layer providing the ideal crack initiation site. 2. Practical observations howev…
A parently, certain single crystals do not obey Schmid's law for slip on individual systems. For example, many intermetallic compounds such as Ni 3Al with the LI 2 structure display yield behaviors that are called “anomalous” in the sense that the critical resolved shear stress on the primary slip system at yield is a…
Abstract The weathering of a trioctahedral mica (phlogopite, 2–100‐µm particle size) was investigated in the rhizosphere of ‘Turilo’ Italian ryegrass ( Lolium multiflorum Lam.). A special culture vessel made it possible to simulate a one‐dimensional macroscopic rhizosphere by developing a root mat on a polyamide net.…
The database on structural phase transitions is presented in the simple and easy accessible form of table. The symmetry changes and temperature for 3446 phase transitions and the references for each of 2242 registered crystalline materials with well defined stoichoimetry are the main data in this table. The rules for…