Materials Literature
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Self-assembly of new organic conjugates of the pentamolybdodiphosphonato cage with cyclic aminomethylphosphonates has been achieved. The crystal structures of two of the conjugates have been determined and all of them characterised by IR spectroscopy. Intramolecular hydrogen bonding of the aminomethyl moiety to cage o…
Surface cross-linking of monodispersed, polymer-modified silica particles, which were prepared by reaction of the colloidal silica with poly(maleic anhydride-styrene) silane coupling agent, with di- or tri-ol and di- or tri-amine, and properties of simultaneously formed carboxyl and amino groups were studied. The copo…
Magnetite particles bearing covalently immobilized copper phthalocyanine dye ("blue magnetite") were prepared and used for the sorption of triphenylmethane dyes from aqueous solutions. The binding of some triphenylmethane dyes bearing two or three amino groups (basic fuchsin, crystal violet, malachite green) followed…
A thin cell method for dielectric time domain spectroscopy is described. The cell allows one to study the dielectric dispersion and absorption spectra for both components of the dielectric permittivity tensor of uniaxial systems like nematic and smectic A and B phases. Results are presented for 4-n-pentyl-4′-cyanobiph…
The angular dependence of the surface anchoring energy of the nematic liquid crystal 5CB on a bistable surface is measured using a twist-cell method. Anchoring bistability is obtained by a grazing SiO evaporation on glass. The data obtained are in good agreement with the simplest fourth order expansion in terms of the…
The reaction path that dolomite follows in its formation, approach to stoichiometry, and approach to order differs in the presence or absence of iron. Dolomite was synthesized in hydrothermal bombs using eight starter combinations heated at 192°C for eight time periods. When iron was present dolomite became the domina…
The Analytical Hierarchy Process was used to characterize the bridge material selection decisions of highway engineers and local highway officials across the United States. State Department of Transportation engineers, private consulting engineers, and local highway officials were personally interviewed in Mississippi…
Targeted drug delivery systems combining thermosensitive liposome-entrapped anticancer drugs and hyperthermia have been tried for targeting drugs to tumors. These heat-sensitive liposomes are prepared from synthetic lipids. Herein we report the use of thermosensitive liposomes composed of natural lipids, viz., egg pho…
Acoustic partial discharge detection appears useful for the location of PD sources within various kinds of insulating systems. The usefulness of such a method to locate discharge sources in hydrogenerator stator bars is illustrated. The adopted measuring procedure, based on two piezo-electric transducers positioned on…
The conduction process in polyetheretherketone (PEEK) is discussed mainly from the results of dc conduction, thermal pulse current (TPC), thermally stimulated current (TSC), and pulsed electroacoustic (PEA) measurements. It was found that dc conduction currents in PEEK are consistent with the values predicted by a the…
Abstract The existence of a bismuth titanate in the range between Bi 2 Ti 4 O 11 (Bi 2 O 3 · 4 TiO 2 ) and Bi 4 Ti 3 O 12 (2 Bi 2 O 3 3TiO 2 ) has been investigated by X‐ray diffraction of samples prepared by solid state reactions. For reaction temperatures above 1100 °C and a starting composition Bi 2 O 3 · 2 TiO 2 t…
Pd–Fe/SiO2 bimetallic catalysts, prepared by sequential wet impregnation, with a constant 2 wt.% Pd loading and with atomic ratios Fe/Pd = 0.5–2.1, and monometallic samples have been studied by quantitative chemisorption and by FTIR spectroscopy of adsorbed CO and NO. The FTIR results indicate that on the examined bim…
Alkoxy-substituted biphenyls are highly polarized in S1, with the negative charge residing on the ring not possessing the alkoxy group, enabling the photogeneration of spectrophotometrically observable transient biphenyl quinone methides by laser flash photolysis.
Abstract Cross‐linked mixtures of polystyrene and poly(vinyl methyl ether) exhibit a non‐vanishing zero‐angle intensity in small‐angle neutron scattering experiments. A possible explanation is that fluctuations in composition in the mixture may be frozen by the presence of cross‐links. Assuming this, we introduce a sc…
For three-component systems composed of a crystalline polymer (component 3), solvent (component 2) and non-solvent (component 1), polymer-poor liquid—polymer-rich liquid and liquid—polymer crystal phase equilibrium lines are constructed. When the two lines overlap, four regions of different phase separations are disti…
Photochromatic derivatives 1,3,3-trimethylindoline-2-spiro-2′-benzopyran, were synthesized using ultrasound as energy source (55 watt), reaction times are between 10 to 20 min, obtaining higher or slightly lower yield than the conventional reported methods.
A quick embedding method using UV polymerization of methacrylate plastic has been devised for embedding fibers encased in a polyvinyl chloride tube. The resulting embedments are suitable for light microscopy and image analysis.
Nucleation, stability and change of hexagonal CaAl2Si2O8 crystals in the solution of anorthite70forsterite10silica20 wt% were investigated by high temperature in-situ observations, ex-situ runs in a furnace, and examinations of the quenched products.Hexagonal CaAl2Si2O8 was observed to crystallize dominantly in the su…
The mixed-valence copper salt of DMe-DCNQI (1, where DMe-DCNQI = 2,5-dimethyl-N,N′-dicyano-p-benzoquinone diimine) is a molecular conductor whose electrical and magnetic properties are quite sensitive to pressure. We have performed selective deuteriation of the molecule 1. By control of the position and number of deut…
The reaction rates of different sized of commercial cokes with CO2 and air were measured using a combined thermogravimetric and differential thermal analysis technique. The temperature range for air oxidation was varied from 873 to 1073 K, and for the reactions with CO2 it varied from 1173 to 1573 K. The oxidation rat…