Materials Literature
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The anticoagulant activity of albumin-heparin conjugates covalently immobilized on carboxylated polystyrene beads was determined before and after exposure to different plasma/PBS dilutions using a thrombin inhibition assay, a FXa inhibition assay, and a modified aPTT assay. Exposure of albumin-heparin modified surface…
A stepwise synthesis of the opp-dibenzoporphyrin (dibenzo[g,q]porphyrin) system involving isoindole precursors is described. 3-Halogeno-1-formylisoindoles are condensed with various α-unsubstituted pyrroles to give the corresponding benzopyrromethene hydrobromides. Thermal self-condensation of such compounds bearing a…
CdS nanocrystallites prepared by capping with pentafluorothiophenol, 2,3,5,6-tetrafluorothiophenol or 4-fluorothiophenol are characterized as quantum dots by TEM, FTIR, NMR, UV–VIS and fluorescence spectroscopy. The crystalline size tends to increase with an increase in the number of fluorine atoms in the capping mole…
Unsteady conjugate mass transfer between a spherical bubble, droplet, or particle and a surrounding fluid flow with chemical reaction in the continuous phase has been analyzed. An algorithm based on spectral methods has been developed and implemented for the simulation of the interphase mass transfer. The influence of…
This investigation established the effects of bulk immiscibility on the bulk and surface structure of FePd catalyst particles supported on graphite. By use of Mössbauer effect spectroscopy, X-ray diffraction and gas-adsorption microcalorimetry, it was shown that iron-rich FePd/Grafoil catalyst particles consist of the…
Numerous methods have been used to illustrate and simulate complex spin-echo phenomena for noninteracting spins. Our approach is to reconstruct the time domain signal by what amounts to a finite Fourier series, the terms of which correspond to spin isochromats. The coefficients of the series evolve in response to puls…
Lithium hydride (LiH) has been shown to react with water at a rate defined by a nonequilibrium thermodynamic-based model. The rate at any time is proportional to the surface area of the LiH multiplied by the difference in chemical activity of the reaction product, lithium hydroxide (LiOH), between the solid phase and…
An analysis of the primary degradation products of the widely used commercial polysulfide polymer Thiokol LP-33 by direct pyrolysis−mass spectrometry (DP−MS) is reported. The mechanism of degradation is through a radical process involving the random cleavage of a formal C−O bond followed by backbiting to form the cycl…
Description Features the latest information on the role of fibers, matrices and their interface/interphase in composite performance. The country'sleading researchers in the field have presented 13 comprehensive, peer-reviewed papers covering innovative approaches to interfacial test methods in composite materials deve…
Pseudomonas putida BM01 was grown efficiently on glucose as the sole carbon source with a supply of a nitrogen source in pH-stat mode using a low setpoint limit. A final cell concentration of 100 g/l was obtained in 30 h of fed-batch cultivation by controlling glucose concentration within the range of 5-20 g/l and mai…
Langmuir monolayers of DHP were confirmed to induce oriented crystallization of HAp in the present study. Both electrostatic and stereochemical interactions at the inorganic-organic interface were of vital importance for the oriented growth of HAp crystals. Organic surfaces with highly ordered functional groups would…
Ceria-supported rhodium catalyst exhibited high activity to decompose nitrous oxide. An introduction of water in the reaction gas remarkably retarded the reaction; the catalyst, however, readily regained its activity when water was removed. On the other hand, oxygen had only a small detrimental effect. ESCA analysis a…
This paper outlines the development of a 500 kV DC oil-filled submarine cable capable of transmitting 2800 MW with /spl plusmn/500 kV 2800 A bipole system. Polypropylene laminated paper (PPLP) was employed as the insulation material, which is the world's first application to DC cables. The conductor size is 3000 mm/su…
Reactions of the previously reported dinuclear vanadium(III) thiolate anion [V(2)(edt)(4)](2)(-) (edtH(2) = ethane-1,2-dithiol) are described. Treatment of (NEt(4))(2)[V(2)(edt)(4)] (1) in MeCN with equimolar (C(12)H(8)S(2))BF(4) (C(12)H(8)S(2)(+) = the thianthrenium radical cation) results in a one-electron oxidation…
Transient currents in cross-linked polyethylene (XLPE) have been investigated by using different parameters: temperature T, electrical field E/sub p/ and hydrostatic pressure P. Anomalous discharging currents flowing in the same direction as charging currents were observed from T=30 to 70/spl deg/C, P=0.1 to 30 MPa an…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTransformation of Poly(S-aryl thioester) by Insertion of Thiiranes: A Novel Approach To Achieve the Synthesis of Sequence-Ordered PolymersAtsushi Kameyama, Yasuharu Murakami, and Tadatomi NishikuboView Author Information Department…
We report the results of particle growth in a polydisperse blend system as a function of (i) heat treatment temperature (190, 220, 250, and 280 °C) and (ii) time of heat treatment (0−290 min) for three blends of isotactic polypropylene and linear low-density polyethylene, prepared by melt extrusion. To a first approxi…
A series of new, kinetically stable, crystalline superlattice compounds containing integral number of intergrown dichalcogenide layers were prepared through controlled crystallization of Ti/Se/Nb/Se superlattice reactants with designed compositional modulation. Discussed in this paper is a family of structural isomers…
The kinetic aspects of polymer adsorption on surfaces are important in many practical applications. Usually, the dynamic conformational behavior of an adsorbed polymer is not measured directly but is interpreted from changes in the thickness of the layer or in the adsorbed amount. Infrared spectroscopy is now used to…
The effect of the microstructure of the base steel on the formation and growth behavior of intermetallics on interstitial free steel during galvanizing under various processing conditions (substrate entry temperature, Al content in galvanizing bath) was investigated from the viewpoint of the surface morphology of the…