Materials Literature
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Three low-molecular weight polyesters, poly(L-lactic acid) (PLA), copoly(lactic acid/glycolic acid) (PLGA) and poly(delta-valerolactone) (PV), were used to prepare water-soluble sodium diclofenac-loaded microspheres by using the oil-in-oil (o/o) emulsification-solvent evaporation method. Their micromeritic and physico…
2-Methacryloyloxyethyl phosphorylcholine (MPC) polymers, which have excellent biocompatibility, have been receiving increasing attention in biomedical and bioengineering fields; however, the mechanical strength of the hydrated MPC polymers is not sufficient for use in these fields as a bulk material. Therefore, we hyp…
An interpenetrating polymer network (IPN) of poly(acrylamide-co-ethylene glycol) (p(AAm-co-EG)) hydrogel was covalently grafted to polyethylene terephthalate (PET) angioplasty balloons to increase surface hydrophilicity and improve lubricity. A 2-step graft polymerization protocol was followed to first polymerize and…
The europium and terbium complexes of an octadentate macrocyclic ligand incorporating benzophenone have been prepared; excitation of the ketone, which has a triplet quantum yield of unity, results in very efficient sensitisation of the emissive states of the bound metal ions.
The present study was designed to analyze the subfibrillar structure of corneal and scleral collagen fibrils by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Isolated collagen fibrils of the bovine cornea and sclera were fixed with 1% OsO4, stained with phosphotungstic acid and uranyl acetate,…
In this paper we report on synthesis and characterisation of the first phosphonate and phosphonic acid-modified porous silicas and polysilsesquioxanes. The organosilicon phosphonates [(EtO)3Si(CH2)3PO(OEt)2] 1 and [(EtO)3Si(CH2)2PO(OEt)2] 2 have been used to introduce phosphonate and phosphonic acid functionalities to…
New sol–gel derived silicas made with a double porous network with pore sizes on two very different length scales (typically several nm and several µm) are reproducibly synthesised using molecular 2,3-di-n-decyloxyanthracene (DDOA) organogelators. The micron sized fibrous patterns made in methanol by DDOA aggregates a…
Poly(3,4‐ethylene dioxythiophene), a conjugated polymer, doped with excess of polystyrenesulfonate (PSS), has been assembled into a mesoscopic conducting network in the form of a hydrogel. When used as an electrode, the material shows fast electrochemical kinetics as evident from cyclic voltammetry, chronopotentiometr…
Raman spectroscopy is used to characterize zirconia films formed on Zircaloy-4 and Zr-1%Nb-0.12%O oxidized in pure water and in water containing 70 ppm of Li as LiOH at 360°C in an autoclave. Raman spectra of monoclinic and tetragonal zirconia change across the thickness of the oxide films. The use of a high-pressure…
Partial discharge pulse phase analysis carried out on a mineral oil and a perfluoropolyether with point-to-plane electrodes provided further and additional evidence that discharge epochs tend to be concentrated in the vicinity of the alternating voltage peaks at discharge inception in lieu of the voltage zeros charact…
The energy-transport models describe the flow of electrons through a semiconductor crystal, influenced by diffusive, electrical, and thermal effects. They consist of the continuity equations for the mass and the energy, coupled with Poisson's equation for the electric potential. These models can be derived from the se…
Molecular dynamics simulations are performed for a supercooled simple liquid with changing the system size from N=108 to 10(4) to examine possible finite-size effects. Although almost no systematic deviation is detected in the static pair correlation functions, it is demonstrated that the structural alpha relaxation i…
Fluorinated amorphous carbon films have been deposited in a plasma-enhanced chemical vapor deposition system, and the optical properties examined by Fourier transform infrared and ultraviolet-visible absorption spectroscopy. The infrared absorption spectra in the region from 1000 to 1800 cm−1 were resolved into ten pe…
The use of thin (Ni/sub 0.81/Fe/sub 0.19/)/sub 1-x/Cr/sub x/ seed layer for obtaining high anisotropic magnetoresistance in Permalloy (Ni/sub 0.81/Fe/sub 0.19/) films is reported. The process yields a high /spl Delta/R/R of for example, 3.2% for 120-/spl Aring/-thick NiFe, without high-temperature deposition or anneal…
{Mn(OH2)2[Mn(bpym)(OH2) ]2[Fe(CN)6]2}∞, a two-dimensional cyanide-bridged polymer, exhibits canted ferrimagnetism with TC = 11 K.
A singular limit is considered for a system of Cahn-Hilliard equations with a degenerate mobility matrix near the deep quench limit. Via formal asymptotics, this singular limit is seen to give rise to geometric motion in which the interfaces between the various pure phases move by motion by minus the surface Laplacian…
Extensive experimental investigations at ambient temperature on commercial Nylon 66, PEI (Polyetherimide) and PEEK (poly(ether ether ketone)) have shown that the overstress model developed for viscoplasticity should be, in principle, capable of modeling for solid polymers the rate-dependent behavior, including creep,…
A model based on dilute‐solution porous‐electrode theory is proposed to describe electrochemical devices that store energy in the double layer (double‐layer capacitors). Various assumptions, such as neglecting concentration polarization, potential‐dependent capacitance, and micropore effects, are made in the model. Fo…
Oxidation of water-insoluble alcohols in supercritical CO2 over a Pd–Pt–Bi/C catalyst in a continuous fixed bed reactor affords high reaction rates and yields up to 98% of the corresponding ketones, aromatic and α,β-unsaturated aliphatic aldehydes, without the risk of using a flammable organic solvent.
Purple crystals of the compound Na2Co2(C2O4)3(H2O)21 were synthesized in high yielding hydrothermal reactions. The room temperature crystal structure reveals an anionic cobalt oxalate network with a 2-leg ladder topology. The ladder frameworks run parallel to the a axis and are held together by both hydrogen bonding a…