Materials Literature
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Abstract The most popular in vitro assay currently used to characterize cell traction forces exerted on extracellular matrix (ECM) fibers is the fibroblast‐populated collagen lattice (FPCL) assay. The compaction of a disk of cell‐populated collagen gel, in terms of rate or extent of diameter reduction, is typically re…
Lithium ion conducting glasses were prepared in the system (0.6Li2S⋅0.4SiS2)-Li3PO4 by twin-roller rapid quenching. The temperatures of glass transition (Tg) and crystallization (Tc) were determined for the glassy samples with 0-40mol% Li3PO4. The conductivity values at 25°C (σ25) were maximized and the activation ene…
Part 1 Accident survey: Introduction, Wind hurricane and tornado generated missiles, Impact and explosion at sea, Car collisions and explosions, Train collisions and impacts, Aircraft and missile impacts, crashes and explosions, Explosions with and without impact, Nuclear explosions and loss-of-coolant accidents, The…
We present 13 C NMR lineshapes and spin lattice relaxation measurements of (TMTTF) 2 Br and (TMTSF) 2 PF 6 in the spin density wave (SDW) state. We confirm that (TMTSF) 2 PF 6 has an incommensurate SDW and show that the phason mode is dominant in the relaxation. We prove that (TMTTF) 2 Br is commensurate and estimate…
Macromolecules
Nanostructural evolution and phase transformation in supported and unsupported titania membranes have been studied using Raman spectroscopy, X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM). Densification of unsupported membranes started at ca. 450 °C and reached more than 97% density a…
The synthetic conditions of amorphous calcium carbonate such as initial concentration of reactant, temperature and pH in the reaction of CaCl2-Na2CO3-NaOH system, and its crystallization in water and NH4Cl solution were investigated. Characteristics of the amorphous phase were determined by means of X-ray diffraction,…
Protonated emeraldine [poly(aniline)] has been encapsulated in MoO3 by first inserting aniline into its lattice followed by successful polymerization with (NH4)2S2O8; the new material is characterized by X-ray diffraction, IR spectroscopy, scanning electron microscopy and charge transport measurements.
Poly(ethylene glycol) (PEG) has been grafted to polystyrene using branched poly(ethylene imine) (PEI) as an anchoring polymer. A dense grafting of PEG chains is obtained if a PEG-PEI adduct is first prepared by treatment of PEI with PEG epoxide and the adduct subsequently adsorbed on an oxidized polystyrene surface. P…
Industrial Microencapsulation: Polymers for Microcapsule Walls Design Of Polymeric Drug Delivery Systems for Controlled Release of Antitumour Drugs The Use of Gelatin and Alginate for the Immobilization of Bioactive Agents Microcapsules for Multiple Emulsions Biodegradable Microspheres for Controlled Drug Delivery Nan…
This paper consists of two parts. First, an electrical model circuit is proposed that can reproduce, with high accuracy, the small-amplitude impedance behaviour of conducting-polymer electrodes in electrolyte solutions. Secondly, the electronic structure of the metal/polymer/solution interphase is discussed in terms o…
Luminescence from the oxygen-to-metal (O → M) ligand-to-metal charge-transfer (l.m.c.t.) triplet states for polyoxometalates of tungsten and molybdenum was observed below 100 K. The Stokes shift was large and the time profile of the emission decay approximated two exponential decays at all temperatures. The emission y…
Different alkenes are epoxidized with high selectivity in the presence of manganese(III) tetraphenylporphyrin–imidazole–sodium periodate–tetrabutylammonium bromide system in CH2Cl2–H2O media, with high yields (80–100%) at room temperature.
The thermal decomposition of 3,5-dihydroxybenzoyl azide, to generate in situ the corresponding AB2-type dihydroxy isocyanate monomer, was found to give hyperbranched polyurethanes, whose structures were established using IR and NMR spectroscopy.
We present the results of our investigations on the electrooptic properties of the smectic O and O* phases of m7tac (1-methylheptyl terephthalylidene-bis-4-aminocinnamate). At low voltages, we observed striking electrochromic effects and, in O* at high voltages, a field induced phase transition. Freely suspended thick…
Polyaniline serves as a synthetic metal catalyst with reversible redox under oxygen to induce dehydrogenative and/or decarboxylative oxidation of benzylamines and 2-phenylglycine into the corresponding imines and, in combination with copper(II) chloride or iron(III) chloride, dehydrogenation of cinnamyl alcohol into c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDye diffusion in isotropic and liquid-crystalline aqueous (hydroxypropyl)celluloseMazidah B. Mustafa, Debbie L. Tipton, Mary D. Barkley, Paul S. Russo, and Frank D. BlumCite this: Macromolecules 1993, 26, 2, 370–378Publication Date (Print):January 1, 1993Publication History…
A novel degradative procedure for the determination of the degree of branching in hyperbranched macromolecules is presented, and its versatility and scope are demonstrated with the synthesis and characterization of hyperbranched polyesters based on 4,4-bis(4′-hydroxyphenyl)pentanoic acid.
This paper is concerned with a system of nonlinear partial differential equations, in short, the coupled Cahn-Hilliard equations, which consists of a fourth order quasilinear parabolic equation and a second order quasilinear parabolic equation. This system was recently derived by Penrose and Fife and also by Alt and P…
Analyses on the effects of polymeric N-acetyl-D-glucosamine (chitin), which was obtained from squid pen, on histiogenic activation in dogs were carried out with subcutaneous implants (5 x 5 cm2) of polyester non-woven fabric (NWF) supplemented with chitin (chitin group) and NWF (control group). These materials were im…