Materials Literature
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Abstract Thermoluminescence (TL) studies of insulators, including crystals of minerals such as calcite, quartz or zircon, have resulted in the development of a wider range of applications in the fields of radiation dosimetry and archaeological and geological dating. Most conventional TL measurements are made by record…
Abstract With the ever increasing demand for better performing products has come the enhanced use of stabilizers and stabilizer systems in both the production and processing of poly(vinylchloride). Antioxidants and chain terminators are commonly used in teh resin manufacturing to improve the initial color and overall…
Abstract Mica domains have received less attention in the literature than smectite quasi-crystals. This study was conducted to determine whether mica crystals form domains in suspension, the conditions in which those domains exist, and the distribution of adsorbed Na and Ca ions in the domains. Particle size distribut…
ADVERTISEMENT RETURN TO ISSUEPREVArticleA new vanadium(V) persulfide complex: (NEt4)[VO(S2)2(bpy)]Stephanie L. Castro, James D. Martin, and George ChristouCite this: Inorg. Chem. 1993, 32, 13, 2978–2980Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https…
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.
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…
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…
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…
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…
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…
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…
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…
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…
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…
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 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…
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…
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…
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…
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…