Materials Literature
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The water vapor transmission rate as a function of the physical and morphological properties of edible barriers containing methyl cellulose and fatty acids (C:14-C:22) were quantified. Barrier morphology was defined via fluorescence microscopy coupled with digitized image analysis. Stearic acid: cellulose barriers exh…
Francisco Rodriguez-Valera, José A.G. Lillo; Halobacteria as producers of polyhydroxyalkanoates, FEMS Microbiology Reviews, Volume 9, Issue 2-4, 1 December
We have studied the spreading of liquid drops on a solid surface by molecular-dynamics simulations of coexisting three-phase Lennard-Jones systems of liquid, vapor, and solid. We consider both spherically symmetric atoms and diatomic molecules, and a range of interaction strengths. As the attraction between liquid and…
In the first two papers of this series, a model, cosistent with observations, was proposed for the densification of a ceramic powder matrix in the presence of dense inclusions. One aspect of the model concerned the breakup of grain bridges linking polycrystalline clusters. This breakup phenomenon results in the format…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTopological rearrangement within a single crystal from a honeycomb cadmium cyanide [Cd(CN)2]n 3D net to a diamond netB. F. Abrahams, M. J. Hardie, B. F. Hoskins, R. Robson, and G. A. WilliamsCite this: J. Am. Chem. Soc. 1992, 114, 26, 10641–10643Publication Date (Print):Dece…
An empirical method to predict critical volume fractions for conduction in conductor-filled polymers is presented, based on the idea that a conductive composite can be thought of as a conductive skeleton with its packing geometry determined by the char acteristics of the conductive filler alone. Trends in critical vol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFemtosecond spectroscopy of vanadyl phthalocyanines in various molecular arrangementsAkira Terasaki, Masahiro Hosoda, Tatsuo Wada, Hirokazu Tada, Atsushi Koma, Akira Yamada, Hiroyuki Sasabe, Anthony F. Garito, and Takayoshi KobayashiCite this: J. Phys. Chem. 1992, 96, 25, 10…
New discotic metallomesogens of 2,3,7,8,12,13,17,18-octakis (alkyl-thio) 5,10,15,20 tetraaza porphyrin (H2Pn) and some related complexes, obtained by reaction of first row transition metal ions Ni(II), Co(II), Cu(II), Zn(II) with the free porphyrin, have been prepared. All materials were characterized by DSC measureme…
We investigated the structure of a low-bandgap conjugated polymer, polyisothianaphthene (PITN), with a joint experimental and theoretical approach. On the one hand, C-13 NMR measurements are performed on the polymer and on a series of model isothianaphthene molecules. These molecular compounds are designed and synthes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPara-linked aromatic poly(amic ethyl esters): precursors to rodlike aromatic polyimides. 1. Synthesis and imidization studyKevin H. Becker and Hans Werner SchmidtCite this: Macromolecules 1992, 25, 25, 6784–6790Publication Date (Print):December 1, 1992Publication History Pub…
We study the dynamics of defects generated in free-standing films of liquid crystals following a thermal quench from the smectic-A phase to the smectic-C phase. The defects are type-1 disclinations, and the strain field between defect pairs is confined to 2\ensuremath{\pi} walls. We compare our observations with a phe…
Short-chain complexed poly-beta-hydroxybutyrate, 130-170 monomer units, is a ubiquitous constituent of cells, wherein it is usually associated with other macromolecules by multiple coordinate bonds, or by hydrogen bonding and hydrophobic interactions. This conserved PHB has been isolated from the plasma membranes of b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of novel cobalt aluminum cofacial porphyrins. First crystal and molecular structure of a heterobimetallic biphenylene pillared cofacial diporphyrinRoger Guilard, Michel Angel Lopez, Alain Tabard, Philippe Richard, Claude Lecomte, Stephane Brand…
Considerable progress has been made toward the goal of diamond synthesis by chemical vapor deposition (CVD). This progress consists of improved methods for synthesis and understanding how diamond is formed. The field has rapidly expanded with industrial consortia, international joint ventures, specialized journals, no…
Eighteen europium–nitrogen bonds are formed when a specially designed bis(terdentate) nitrogen-containing ligand L1 reacts with europium(III) perchlorate. In the resulting triple-helical dinuclear cation [Eu2L]6+ 1, the metals are coordinated to nine nitrogen atoms each, forming a slightly distorted tricapped trigonal…
Abstract This paper deals with the early stages of blend morphology development as occurs in a screw extruder. Using combinations of similar polymers (polystyrene and styrene‐butadiene copolymer) and dissimilar polymers (PS and EVA) as model systems, it has been concluded that during melting the scale of segregation b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCellulose acetate butyrate and poly(hydroxybutyrate-co-valerate) copolymer blendsCharles M. Buchanan, Steve C. Gedon, Alan W. White, and Matthew D. WoodCite this: Macromolecules 1992, 25, 26, 7373–7381Publication Date (Print):December 1, 1992Publication History Published onl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe crystal/liquid interface: structure and properties from computer simulationBrian B. Laird and A. D. J. HaymetCite this: Chem. Rev. 1992, 92, 8, 1819–1837Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst ferromagnetic interaction in a heteropoly complex: [CoII4O14(H2O)2(PW9O27)2]10-. Experiment and theory for intramolecular anisotropic exchange involving the four Co(II) atomsNieves Casan-Pastor, Julia Bas-Serra, Eugenio Coronado, Genevieve Pourroy, and Louis C. W. Bake…
Pseudomonas oleovorans is an adaptable, aerobic bacterium that can produce a wide range of storage polyesters (poly-β-hydroxyalkanoates, PHAs). With few exceptions, the PHAs obtained when this bacterium is grown with single organic substrates capable of polymer production are generally copolymers. With two different p…