Materials Literature
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The incorporation of Ga into the framework of zeolite Beta has been evidenced by X-ray absorption spectroscopy. Analysis of extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) data reveals the atomic environment of Ga in zeolite Beta. Both techniques provide evidence that…
The experimentally-optimized optical resolution of DL-phenylglycine (PG) with (1S)-(+)-camphor-10-sulfonic acid ((+)-CS) afforded the crystalline D-PG·(+)-CS salt in 45.7% isolated yield and 98.8% optical purity. This excellent resolution has been studied by comparison of the crystal properties of the diastereomeric s…
An investigation was conducted to determine the feasibility of analysing cement by introducing it as a slurry into an inductively coupled plasma optical emission spectrometer (ICP-OES). A complete analysis of cement for major (Ca, Si, Mg, Al, Fe) and minor and trace elements (S, K, Ti, Na, P, Mn and Sr) was accomplish…
The chemistry of cyclosilazanes and borazines is a topic of current interest in view of preceramic polymers which yield on pyrolysis various useful ceramic materials, e.g. silicon and boron carbide, silicon and boron nitride, and ternary or quaternary mixtures of these materials. These materials are hard and have high…
Bi 2 (Zn 1/3 Nb 2/3 ) 2 O 7 (BZN) thin films were prepared by using a pulsed laser deposition technique. For films in situ deposited on indium–tin oxide (ITO) coated glass substrates, the crystalline phase can be obtained by growing at a substrate temperature (Ts) higher than 475 °C. Too low a substrate temperature (T…
The sweeping of small dipolar loops by gliding dislocations is thought to be one of the mechanisms leading to dislocation pattern formation during cyclic deformation. The individual sweeping event was calculated within the framework of isotropic linear elasticity for an infinite straight gliding segment and a rigid di…
Doxorubicin loads quite efficiently into preformed citrate containing liposomes (<200 nm) in response to an inside-acidic pH gradient: >95% loading for drug/lipid as high as 1:1 w/w. In fact, doxorubicin's loading was found to exceed theoretical predictions because it forms an insoluble complex with citrate. In this r…
This paper summarises the latest developments of the proposed acoustic emission technique. Acoustic emission signals have been processed using the three-dimensional /spl phi/-q-n distribution and the influence of electric stress, void size, void shape and test time studied. The attenuation of the AE signal through dif…
Apparent mobilities of positive charge carriers in a regioregular poly(3-octylthiophene) (POT) film at various doping levels are evaluated by an electrochemical technique combining potential-step chronocoulometry and an in situ conductivity measurement. The carrier mobility decreases from 5 × 10−3 cm2 V−1 s−1 to 5 × 1…
Improvement of electrical conductivity was attempted by polymerizing octacyanometallophthalocyanine (MPcOC; M ≡ Fe , Co ) units into one-dimensional molecular complexes. The synthetic route to MPcOC was established by reacting tetracyanobenzene with a metal(II) acetate in sulfolane. Poly(μ-pyrazine)octacyanophthalocya…
The conductivity modulus in fast ion conductors (FIC) has often been fitted with stretched exponential relaxation functions of the form $\mathrm{exp}[\ensuremath{-}(t/{\ensuremath{\tau}}_{K}{)}^{\ensuremath{\beta}}],$ where the \ensuremath{\beta} values are taken to be independent of temperature. This analysis corresp…
The effects caused by cryogenic treatment (freezing–frozen storage–thawing) of 0.5–2.0 g/dL solutions of individual starch polysaccharides, namely, amylopectin (solvents: water or 0.35M NaCl aqueous solution) and amylose (solvent: 0.35M NaCl aqueous solution), and also of 0.5 g/dL solutions of their artificial mixture…
This paper describes in terms of the mass of the solvents in the oil, water, and distillate phases the curing process of highly spheric monodispersed 4-mm-in-diameter polystyrene capsules of a uniform thickness. It was determined that the water solubility of the solvents is crucial in the solvent selection in order to…
A new calix[4]arene receptor modified with 8-hydroxyquinoline has been synthesised, exhibiting luminescence and energy transfer properties in the presence of coordinated Eu3+ and Tb3+ ions.
The specific interaction between poly(3-hydroxybutyrate) [P(3HB)] and 4,4′-thiodiphenol (TDP) and between poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and TDP was investigated by Fourier transform infrared (FTIR) spectroscopy. Interassociated hydrogen bonds were found between the polyester chains and the TDP mo…
In this article, the short chain-branching distribution (SCBD) of some metallocene-based ethylene–butene copolymers was evaluated by DSC, and some conventional ethylene copolymers were also studied for the purpose of comparison. It is found that metallocene-based ethylene copolymers have a relative narrower SCBD. Thes…
A new radical anionic bridging ligand, derived from the in situ reduction of α,α′-dicyanoperfluorostilbene, is reported to support ferrimagnetic ordering below 205 K in a three-dimensional vanadium-based coordination polymer.
In accordance with an approach suggested by Kissin (J Polym Sci Polym Phys Ed 1992, 30, 1165), a general form of the Beer–Lambert law was employed to estimate the White–Spruiell biaxial orientation factors of the crystalline phase in various polyethylene blown films. Certain assumptions employed by Kissin are invalid…
A new route to the synthesis of 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane has been introduced. This polyamino derivative of 1,4,7-triazacyclononane has been used to synthesise a new ligand (L) by Schiff-base condensation with sodium pyruvate in the presence of lanthanide(III) (Ln) ions as templating agents to f…
A new technique for the enzyme-amplified lanthanide luminescence (EALL) quantification of peroxidase in bioassays is introduced. Several phenolic peroxidase substrates may be used. These are dimerised in the course of the enzymatic reaction and subsequently form luminescent ternary complexes with terbium(III) EDTA. Th…