Shear-induced demixing in a polystyrene/poly(vinyl methyl ether) blend: in-situ fluorescence and rheometry
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Materials Literature
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Composition and Appearance of Magnesium Silicate Hydrate and Its Relation to Deterioration of Cement‐Based Materials
Magnesium sulfate's attack on cement‐based materials results in massive deposition of gypsum and brucite accompanied by decalcification of calcium silicate hydrate (CSH) (the binding material of the cement). Magnesium silicate hydrate (MSH) appears as a late‐stage product, mainly on deteriorated surfaces, and replaces…
Synthesis, Spectroscopy, Electrochemistry, and Spectroelectrochemistry of a Zinc Phthalocyanine with D2h Symmetry
Abstract An efficient method is reported for the preparation of metallophthalocyanines (MtPcs) with D2h symmetry (di-substituted type). A ZnPc with D2h symmetry thus obtained has been characterized by NMR, absorption, fluorescence emission and excitation and magnetic circular dichroism (MCD) spectroscopy, together wit…
Lamellar mesogels and mesophases: a self-consistent-field theory
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLamellar mesogels and mesophases: a self-consistent-field theoryE. B. Zhulina and A. HalperinCite this: Macromolecules 1992, 25, 21, 5730–5741Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 1992https://doi.org…
Rietveld refinement round robin. I. Analysis of standard X-ray and neutron data for PbSO4
The Commission on Powder Diffraction of the International Union of Crystallography has undertaken an intercomparison of Rietveld refinements performed with two `standard' PbSO 4 powder diffraction patterns: a conventional (two-wavelength) X-ray pattern collected on a Bragg–Brentano diffractometer with Cu Kα radiation…
Dynamics of Rigid and Semirigid Rodlike Polymers
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Structure and chemical properties of ptilomycalin A
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and chemical properties of ptilomycalin AIkuko Ohtani, Takenori Kusumi, Hiroshi Kakisawa, Yoel Kashman, and Shulamit HirshCite this: J. Am. Chem. Soc. 1992, 114, 22, 8472–8479Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Publ…
Poly(β-hydroxybutyrate) stereoisomers: a model study of the effects of stereochemical and morphological variables on polymer biological degradability
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(β-hydroxybutyrate) stereoisomers: a model study of the effects of stereochemical and morphological variables on polymer biological degradabilityJohn E. Kemnitzer, Stephen P. McCarthy, and Richard A. GrossCite this: Macromolecules 1992, 25, 22, 5927–5934Publication Date…
Thermal degradation of polymethacrylic acid
Abstract The thermal degradation of polymethacrylic acid was found to have two separate decomposition regions. The first decomposition region, due to anhydride formation primarily, was caused by the conversion of polymethacrylic acid to polymethacrylic anhydride. This reaction followed first‐order kinetics and had an…
Sorption and diffusion of water vapor in polyimide films
Abstract Sorption and diffusion of water vapor are investigated gravimetrically for polyimide films. The activity dependence of the solubility and diffusion coefficients, S and D , respectively, is classified under four types: (1) constant S and D type, (2) dual‐mode sorption and transport type, (3) dual‐mode type fol…
Development of porous anodic films on aluminium
Development of porous anodic films on aluminium has been investigated by transmission electron microscopy of ultramicrotomed sections, with particular attention directed to the location and origin of the non-uniform thickening of the initial barrier oxide. Preparation of thin ultramicrotomed sections, less that 10 nm…
Texture in Rietveld refinement
A texture model suitable for use in Rietveld-refinement programs is proposed. It is based on the series expansion of the pole distribution function in symmetrized harmonics. The model was tested on a textured plate sample of Al 2 O 3 .
Nitrilase from Rhodococcus rhodochrous J1. Sequencing and overexpression of the gene and identification of an essential cysteine residue.
The amino acid sequences of the NH2 terminus and internal peptide fragments of a Rhodococcus rhodochrous J1 nitrilase were determined to prepare synthetic oligonucleotides as primers for the polymerase chain reaction. A 750-base DNA fragment thus amplified was used as the probe to clone a 5.4-kilobase PstI fragment co…
Rosarin: a new, easily prepared hexapyrrolic expanded porphyrin
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRosarin: a new, easily prepared hexapyrrolic expanded porphyrinJonathan L. Sessler, Steven J. Weghorn, Takashi Morishima, Miguel Rosingana, Vincent Lynch, and Virgil LeeCite this: J. Am. Chem. Soc. 1992, 114, 21, 8306–8307Publication Date (Print):October 1, 1992Publication H…
Perfluorinated polyimide synthesis
ADVERTISEMENT RETURN TO ISSUEPREVArticlePerfluorinated polyimide synthesisShinji Ando, Tohru Matsuura, and Shigekuni SasakiCite this: Macromolecules 1992, 25, 21, 5858–5860Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 1992https://pubs.acs.org/doi/10.1…
In Situ Determination of Gravimetric and Volumetric Charge Densities of Battery Electrodes: Polyaniline in Aqueous and Nonaqueous Electrolytes
Polyaniline (PANI) electrodes with redox capacities >1 C/cm 2 were investigated by in situ electrogravimetry in aqueous electrolytes of pH values varying from <0 to 3 and in nonaqueous, propylene carbonate‐based media. Film mass, volume, and bulk density were determined in situ as a function of electrode potential. Fo…
Adsorption of poly(styrenesulfonate) onto an ammonium monolayer on mica: a surface forces study
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of poly(styrenesulfonate) onto an ammonium monolayer on mica: a surface forces studyPeter Berndt, Kazue Kurihara, and Toyoki KunitakeCite this: Langmuir 1992, 8, 10, 2486–2490Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Pub…
Structures of cubic and orthorhombic phases of acetylene by single-crystal neutron diffraction
C 2 H 2 cristallise dans Pa3, Z=4, avec a T=131, 141K, a o =6.0940,6.1050; et affinement jusqu'a R=0.065,0.052. C 2 D 2 cristallise a T=143K dans Pa3 avec Z=4, a o =6.1020A, et a T=15K dans Acam avec Z=4, a=6.198, b=6.023, c=5.578A. Pour ces deux temperatures, l'affinement atteint R=0.068, 0.081
Charge dynamics in irradiated polymers
Recent progress in the field of charge storage and charge transport in polymers irradiated with partially penetrating electron beams is discussed. The analytical model used to describe these phenomena takes the following physical parameters and processes into consideration: charge and energy deposition profiles, ohmic…
Direct determination of grain-boundary and dislocation self-diffusion coefficients in silver from experiments in type-C kinetics
The use of an implanted, mass-separated carrier-free 105Ag radiotracer improves the sensitivity for measuring grain-boundary (GB) penetration profiles. In this way the GB self-diffusion coefficient DGB in silver was directly determined from experiments in type-C kinetics conditions. When multiplying the DGB values wit…