STM investigations on primary particle morphology of polyaniline
Abstract SEM investigation of polyaniline (PAni) layers showed that it is composed of around 10 nm small primary particles. This is in accordance with other earlier results.
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Hematite Identification in Pseudo-Particles of Moroccan Rubified Soils
Abstract In Moroccan calcareous mountains, red soils are distinguishable from brown soils, not only by their colour but also by their microaggregated structure. Clay mineral dispersion studies of these soils were carried out by increasing pH, after different treatments. The formation of the pseudo-particles appears to…
Corrosion inhibition of carbon and low alloy steels in sulphuric acid solutions by 2‐mercaptopyrimidine derivatives
Abstract Several derivatives of 2‐mercaptopyrimidine (containing ‐OH, ‐SH, ‐NH 2 or ‐CH 3 substituents) have been studied as corrosion inhibitors of ARMCO iron and low alloy steels in 1 M sulphuric acid solutions. Tests have been conducted during 6 h in the temperature interval between 60 and 90°C. The trends of the c…
Surface tension of liquid polysiloxanes having fluorinated alkyl side‐chains
Abstract The surface tension of viscous polymer liquids, viz. polysiloxanes having fluorinated alkyl sidechains, was evaluated based on the pendant‐drop method. The polysiloxane fluids studied are poly‐(3,3,3‐trifluoropropylmethylsiloxane), poly(3,3,4,4,5,5,6,6,6‐nonafluorohexylmethylsiloxane) (PNFHMS), poly(3,3,4,4,5…
Dissociation and recombination dynamics of the complexes [(.eta.5-C5R5)Cr(CO)3]2 (R = hydrogen, methyl)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDissociation and recombination dynamics of the complexes [(.eta.5-C5R5)Cr(CO)3]2 (R = hydrogen, methyl)Qin Yao, Andreja Bakac, and James H. EspensonCite this: Organometallics 1993, 12, 6, 2010–2012Publication Date (Print):June 1, 1993Publication History Published online1 May…
Miscibility in blends of model polyolefins and corresponding diblock copolymers: thermal analysis studies
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility in blends of model polyolefins and corresponding diblock copolymers: thermal analysis studiesD. J. Lohse, L. J. Fetters, M. J. Doyle, H. C. Wang, and C. KowCite this: Macromolecules 1993, 26, 13, 3444–3447Publication Date (Print):June 1, 1993Publication History P…
Mechanism of Grain Growth of β‐SiAlON
The mechanism for grain growth of β‐SiAlON has been investigated by annealing high‐density β‐SiAlON–YAG materials at 1650°C. An observed decrease in grain growth with increasing weight fraction of liquid confirms a diffusion‐controlled growth mechanism in the system. The grain‐growth mechanism is further characterized…
Interdigitated smectic A and B mesophases in higher homologues of the 5O.mseries
We report the synthesis, characterization and structural studies of the higher homologues of N(4-n-pentyloxybenzylidene)4-n-alkylaniline compounds, viz. 5O.12, 5O.14 and 5O.16 by thermal microscopy, differential scanning calorimetry and X-ray diffraction. The compounds exhibit N–SA–SB, N–SA–SB and N–SA phase sequence…
Powder second harmonic generation efficiencies of saccharide materials
Saccharide materials are potential candidates for frequency conversion applications. In addition to being chiral, which ensures crystallization in a space group necessary for three-wave mixing processes, they generally possess useful physical and optical properties. We have examined the powder second harmonic generati…
Electrochemical elaboration of thin films of poly[RuII(L)(CO)2Cl2] (L = 4-(2-pyrrol-1-ylethyl)-4'-methyl-2,2'-bipyridine or 4,4'-bis((3-pyrrol-1-ylpropyloxy)carbonyl)-2,2'-bipyridine): photochemical properties and photoimaging
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical elaboration of thin films of poly[RuII(L)(CO)2Cl2] (L = 4-(2-pyrrol-1-ylethyl)-4'-methyl-2,2'-bipyridine or 4,4'-bis((3-pyrrol-1-ylpropyloxy)carbonyl)-2,2'-bipyridine): photochemical properties and photoimagingMarie Noelle Collomb-Dunand-Sauthier, Alain Deron…
Burgers vector of dislocations in an icosahedralAl62Cu25.5Fe12.5quasicrystal determined by means of convergent-beam electron diffraction
Dislocations in an ${\mathrm{Al}}_{62}$${\mathrm{Cu}}_{25.5}$${\mathrm{Fe}}_{12.5}$ face-centered icosahedral quasicrystal were studied by means of the contrast experiment and defocus convergent-beam electron diffraction technique. The indices of the six-dimensional Burgers vector of the dislocations were determined t…
Stacking fault energies of random metallic alloys
Stacking fault energies in dilute Cu(Al) alloys and across the composition range of PdAg alloys are calculated from first principles using the layer Korringa-Kohn-Rostoker method and treating the compositional disorder within the coherent potential approximation. In Cu(Al), rigid-band behaviour results in a sharp redu…
Pressure Induced Disorder in Kaolinite
Abstract Changes caused by pressures between 0 and 20 K bar on two samples of kaolinite have been studied. Increased pressure causes the samples to lose crystallinity, shown by a decrease in the Hinckley, Lietard and reference intensity ratio indices, as well as by the crystallite size measured from the 001 reflection…
Numerical simulation of Case II transport
Abstract A nonlinear conservation equation for the fluid concentration field during onedimensional viscoelastic diffusion is derived by retaining the concentration dependencies of physical properties in the fluid flux expression from the nonequilibrium thermodynamic treatment of Durning and Tabor (1986). The result is…
Molecular weight and solution viscosity characterization of PVC
Abstract As a means of developing the most accurate possible Mark‐Houwink relationship possible for PVC, the literature Mark‐Houwink coefficients for the weight average molecular weight ( M W ) of PVC in THF are plotted and the derived “grand average” Mark‐Houwink relationship ( K = 15.56 × 10 −3 ml/g, a = 0.7690) is…
Low- and high-temperature structures of neopentylglycol plastic crystal
Plastic crystals, such as neopentylglycol, 2, 2-dimethyl-1,3-propanediol, that exhibit polymorphic behavior are emerging materials for thermal energy storage. The energy is stored isothermally in the γ phase, FCC, during solid-state phase transformations. This γ phase of NPG has been determined as an orientational dis…
A modeling approach to thermoplastic pultrusion. II: Verification of models
Abstract A set of mathematical models as a thermoplastic pultrusion process is evaluated. The predictions of the models are compared to experimentally obtained data in terms of composite temperature and pressure and process pulling force. The comparisons between predictions and experiments are made for two different m…
Crystallization of Copper Metaphosphate Glass
The effect of the valence state of copper in copper metaphosphate glass on the crystallization behavior and glass transition temperature has been investigated. The crystallization of copper metaphosphate is initiated from the surface and its main crystalline phase is copper metaphosphate (Cu(PO) 3 ), independent of th…
Settling and Coagulation of Slender Type Diatoms
A slender type diatom is observed. The settling behavior and surface electrostatic situation of the diatom are discussed through the consideration of physiological activity and observation by SEM. By considering the settling behavior, one side of slender type diatoms such as Nitzschia and Synedra is heavier than the o…
Multiphase structure of segmented polyurethanes: Its relation with spherulite structure
Abstract Small‐angle light‐scattering (SALS), Polarized light microscopy (PLM), differntial scanning calorimetry (DSC), and small‐angle x‐ray scattering (SAXS) were used to study morphological changes in segmented polyurethanes with 4,4′‐diphenylmethane diisocyanate (MDI) and 1,4‐butanediol (BD) as the hard segment. I…