Materials Literature
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Large 1H chemical shifts are suggestive of protonic superacidity of sulfated zirconia catalysts, this property being related to the structure of surface sulfate species.
Nitrogen adsorption isotherms have been measured on a series of aluminosilicate and titanosilicate MCM-41 Molecular sieves, whose mean pore radius varied from ca. 0.9 to ca. 2 nm. By means of comparison plots the nature of the adsorption on these materials was found to depend strongly on their pore size. With pores of…
The adsorption of low-molecular-weight polyacrylic acid (Mr= 2000) on zirconia has been studied as a function of pH. In this study, an atomic force microscope (AFM) was used to monitor directly the changes in polymer conformation at the solid/water interface. Force–distance profiles were obtained at AFM scan rates equ…
Evidence is presented on the harmful impact of a diatom (Thalassiosira rotula) on the reproductive biology of the copepod Calanus helgolan&cus. When adult females were fed the &atom, both total egg production and hatching success were significantly lower than with the dinoflagellate Prorocentrum minimum. Embryonic dev…
The synthesis and characterisation of the dodecanuclear nickel complex, [Ni12(O2CMe)12(chp)12(H2O)6(THF)6](where chp = the anion of 6-chloro-2-pyridone) is described; structure determination shows formation of a metallocycle, while magnetic studies indicate ferromagnetic coupling between the nickel(II) ions within the…
The formation of photostimulated luminescence (PSL) centers in BaFBr:Eu 2+ single-crystal phosphors is studied in the 5–9 eV vacuum ultraviolet region. The centers are efficiently formed by the Eu 2+ photoionization absorption at 6.6 eV. The PSL excitation spectrum after the photoionization excitation is almost the sa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase behavior of blends of linear and branched polyethylenes in the molten and solid states by small-angle neutron scatteringR. G. Alamo, J. D. Londono, L. Mandelkern, F. C. Stehling, and G. D. WignallCite this: Macromolecules 1994, 27, 2, 411–417Publication Date (Print):Ja…
Viscosity and yield stress measurements of A1 2 O 3 slurries containing high concentrations of electrolyte are reported. Contrary to what is expected from DLVO theory, the particles in coagulated slurries produced in this way are held together by weaker forces than particles in slurries brought to the isoelectric poin…
The self-assembly of the complementary components AP2 and AU2, through hydrogen bonding via uracil and 2,6-diacylaminopyridine groups, yields polymeric supramolecular rigid rods (AP2, AU2)n that present a lyotropic mesophase.
A Crystalline mesoporous member of the MCM-41 family has been synthesised with a Si : Al ratio as low as 8.5 : 1, without observing octahedral aluminium.
The use of surfactants as templates allows the synthesis of mesostructured transition-metal oxides by a cooperative, interface controlled condensation process.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolystyrene-poly(methacrylic acid) block copolymer micellesAnwei Qin, Minmin Tian, C. Ramireddy, Stephen E. Webber, Petr Munk, and Zdenek TuzarCite this: Macromolecules 1994, 27, 1, 120–126Publication Date (Print):January 1, 1994Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlatinum complex [(en)Pt(uracilate)]44+: a metal analog of calix[4]arene. Similarities and differences with classical calix[4]arenesHolger Rauter, Edda C. Hillgeris, Andrea Erxleben, and Bernhard LippertCite this: J. Am. Chem. Soc. 1994, 116, 2, 616–624Publication Date (Prin…
Synroc is an advanced titanate ceramic comprising an assemblage of phases chosen for their compatibility, geological/geochemical stability and collective ability to immobilise the various elements and radionuclides present in high-level nuclear wastes. A major technical advantage of the Synroc strategy is that it poss…
A new technology to vulcanize natural rubber latex by radiation has been developed. Environmental advantages of the technology over conventional sulfur vulcanization are 1) absence of nitrosamines, 2) low emission of SO2 on combustion and 3) degradability in the environment. These advantages which come from the fact t…
The diffusivity of hydrogen and deuterium in palladium has been measured at temperatures between 773 and 1373 K and at hydrogen and deuterium concentrations less than 10–4 H/Pd and D/Pd (atomic ratio). The measured diffusion coefficients for hydrogen (DH) and deuterium (DD) showed Arrhenius behaviour. The dependence o…
The melting line of graphite has been investigated using a method of flash‐heating of small rod of graphite by discharging a bank of capacitors in a 6–8 anvil type high pressure apparatus. The changes of enthalpy of graphite up to the melting point were obtained from the heating energy inserted from a bank of capacito…
The performance characteristics of the ZnO‐Bi 2 O3‐based varistors can be assessed to meet the applications criteria on the basis of a systematic evaluation corresponding to various experimental conditions. This evaluation process employs the lumped parameter/complex plane analysis technique for the ac small‐signal im…
An unsymmetrical donor 4,5-ethylenedithio-4′,5′-(2-oxatrimethylenedithio)-diselenadithiafulvalene (EOST)† has been synthesized. Single crystals of some charge-transfer salts of EOST have been prepared electrochemically. The crystal structures of EOST and its charge-transfer salts were analysed by X-ray crystallography…
An approximate theoretical model of foam spreading on a liquid surface has been formulated. The model is analogous to the spreading of oil slicks on water surfaces. Viscous friction is assumed to be the dominating mechanism in opposing the foam spread. The friction is described by a lumped friction constant. The sprea…