Materials Literature
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By mixing of potentially-mesomorphic electron donors and acceptors of the type N-(p-X-benzylidene)-p-Y-aniline, nematic and smectic liquid crystals could be induced. In the present work, the donor molecules with a dimethylamino group as X or Y and the acceptor molecule with a nitro group as X or Y were employed. The r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcluded-volume effects in dilute polymer solutions. 11. Tests of the two-parameter theory for radius of gyration and intrinsic viscosityY. Miyaki and H. FujitaCite this: Macromolecules 1981, 14, 3, 742–746Publication Date (Print):May 1, 1981Publication History Published onl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of interfacial tension in ternary homopolymer-solvent systemsK. M. Hong and J. NoolandiCite this: Macromolecules 1981, 14, 3, 736–742Publication Date (Print):May 1, 1981Publication History Published online1 May 2002Published inissue 1 May 1981https://doi.org/10.1021/m…
A series of radioactively labelled porphyrin analogues have been synthesized and compared for tissue distribution and tumour uptake against 67Ga in the same tumour-mouse system. The compounds were: 14C-ms-tetraphenylporphine sulphonate (14C-TPPS), 35S-ms-tetraphenylporphine sulphonate (TPP35S), 35S-ms-tetra[beta-napht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron electrochemical reduction of a ferrous porphyrin dioxygen complexCurtis H. Welborn, David Dolphin, and Brian R. JamesCite this: J. Am. Chem. Soc. 1981, 103, 10, 2869–2871Publication Date (Print):May 1, 1981Publication History Published online1 May 2002Published…
A smeared-out-dislocation-type analysis is used to determine conditions for the blunting of an atomically sharp crack that is opened intension. It is found that when the ratio of the theoretical tensile strength σmax to theoretical shear strength τmax is large, pairs of dislocations of opposite sign are created, as th…
In the presence of certain cations (e.g. K+ or Mg2+) actin polymerizes. Below a certain concentration (the critical concentration) the monomer G-actin does not polymerize on the addition of K+ or Mg2+. However, the proteolysis experiments of Rich and Estes [J. Mol. Biol. 104, 777--792 (1976)] strongly suggest that cat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective telomerization of butadiene with various nucleophiles catalyzed by polymer-bound palladium(0) complexesKiyotomi Kaneda, Hiroo Kurosaki, Masami Terasawa, Toshinobu Imanaka, and Shiichiro TeranishiCite this: J. Org. Chem. 1981, 46, 11, 2356–2362Publication Date (Prin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe crystal and molecular structure of new tetravalent ruthenium porphyrin. .mu.-Oxo-bis[(octaethylporphinato)ruthenium(IV) hydroxide]Hideki Masuda, Tooru Taga, Kenji Osaki, Hiroshi Sugimoto, Masayasu Mori, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1981, 103, 9, 2199–2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImidazolate- and oxo-bridged metalloporphyrinsJohn T. Landrum, David Grimmett, Kenneth J. Haller, W. Robert Scheidt, and Christopher A. ReedCite this: J. Am. Chem. Soc. 1981, 103, 10, 2640–2650Publication Date (Print):May 1, 1981Publication History Published online1 May 2002…
We have carried out a high resolution X-ray study of the smectic phases of Butyloxybenzylidene Octylaniline. We find that the phase previously identified as Smectic-B in this material is crystalline with in-plane order extending over at least 1.4 μm. The in-plane Bragg peaks are accompanied by anomalously strong diffu…
The properties of plane waves are well known, and it is probably because they are that we often try to represent any unknown field as a combination of such waves. Is such a representation always efficient or even correct? We try to answer this question for a simple problem arising in the electromagnetic study of grati…
Ionic charge-transfer (CT) complexes were prepared by mixing neutral solutions of the potent electron acceptor TCNQF4 (7,7,8,8-tetracyano-2,3,5,6-tetrafluoroquinodimethane) with the strong donors M2P(5,10-dihydro-5,10-diemethylphenazine) and TMPD(N,N,N′,N′-tetramethyl-p-phenylenediamine). M2P–TCNQF4 [complex (1)] and…
The synthesis of three oligomeric derivatives of 4-isobutylphenyl-2-propionic acid (ibuprofen), namely, the monoester of tetraethylene glycol (I) and the diesters of poly(oxyethylene) samples having molecular weights of 1000 (+/- 50) and 2000 (+/- 150) (II and III), has been performed via the imidazolide method. The a…
A thermal shock test was designed which permits the thermal fracture resistance and the mechanical strength of brittle materials to be quantitatively correlated. Thermal shock results for two materials, A1 2 O 3 and SiC, were accurately predicted from biaxial strength measurements and a transient thermal stress analys…
An explanation is given for the apparent stability of a minor phase in a two‐phase system, such as a glass in a glass ceramic, even though normally the glass would be expected to dissolve completely into the crystalline phase. It is shown that the glass would be stable only if it is segregated to the triple‐junction n…
In order to examine the effect of external noise on the electrohydrodynamic instability, we have measured the wave number spectrum of the pattern of Williams domain in nematic liquid crystals MBBA in the presence of external noise superposed to the a c voltage. The threshold voltage for the onset of Williams domain is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAspects of artificial photosynthesis. Photosensitized electron transfer across bilayers, charge separation, and hydrogen production in anionic surfactant vesiclesMohammad S. Tunuli and Janos H. FendlerCite this: J. Am. Chem. Soc. 1981, 103, 10, 2507–2513Publication Date (Pri…
A dense high‐alumina ceramic has been developed for the immobilization of Savannah River Plant nuclear waste. The ceramic, fabricated by reactive hot‐pressing, consists of four compatible crystalline phases, alumina, spinel, magnetoplumbite, and uraninite. The magnetoplumbite phase can incorporate the elements Cs, Sr,…
An irrigated rotation has supported high crop yields for 66 yr without the benefit of K fertilizer because of the relatively high total K status (14 392 ppm in the 0- to 15-cm layer and 11 183 ppm in the 15-to 30-cm layer) of the soil. This K status, under native conditions, was due to the nature of the parent materia…