Materials Literature
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Molten additive binary systems having a common anion yield much more heuristic information for a better understanding of the mechanism of ionic conduction than pure melts do. In most of such systems the Chemla effect occurs; the mobility isotherms of two cations have a crossing point called the Chemla crossing point.…
The relationship between cardiovascular device performance in animals and humans is not straightforward. As the principal formed element in a thrombus, platelets play a major role in determining the hemocompatibility of mechanical heart valves and other high-shear-rate cardiovascular devices. Since larger animals are…
The interactions between plasma proteins and platelets are responsible for surface adsorption and activation of platelets, which leads to initiation of platelet-mediated thrombotic events at biomaterial surfaces. We are seeking to gain a fundamental understanding of these interactions. The atomic force microscope (AFM…
Hydrogels based on polymeric derivatives of vitamin E for biomedical purposes have been prepared by copolymerization reaction of the alpha-tocopheryl methacrylate (V) with 2-hydroxyethyl methacrylate (H) in a range of composition between 5-20 wt % of V. The swelling behavior of the hydrogels in water, alkaline, and ac…
A novel type of amphiphilic spherosilsesquioxane derivative, 1-(1,ω-propylenemethoxy)oligo(ethylene oxide)-3,5,7,9,11,13,15-heptahydridopentacyclo[9.5.1 3,9 .1 5,15 .1 7,13 ]octasiloxane has been prepared from (HSiO 3/2 ) 8 and allyl-functional oligo(ethyleneoxide) ( M n = 750 g/mol) by hydrosilylation. The monosubsti…
Polyanhydrides synthesized from pure ricinoleic acid half-esters with maleic and succinic anhydrides possess desired physicochemical and mechanical properties for use as drug carriers. Ricinoleic acid maleate or succinate diacid half-esters were prepared from the reaction of crude ricinoleic acid (85% content) with su…
Formulations of a polymeric delivery system containing a 75/25 poly(DL-lactide-co-caprolactone dissolved in either N-methyl-2-pyrrolidone or dimethyl sulfoxide were injected both subcutaneously (SC) and intramuscularly (IM) into rhesus monkeys. Each monkey received an SC and IM injection of each of the two formulation…
The relationship between cardiovascular device performance in animals and humans is not straightforward. As the principal formed element in a thrombus, platelets play a major role in determining the hemocompatibility of mechanical heart valves and other high-shear-rate cardiovascular devices. Since larger animals are…
In this paper we present results on numerical studies of the martensitic-austenitic phase transition mechanism in a large shape-memory-alloy rod. Three groups of experiments are reported. They include results on stress- and temperature- induced phase transformations as well as the analysis of the hysteresis phenomenon…
Silver proton-exchanged antimonic acids, with pyrochlore-type structure and composition of H 2 - x Ag x Sb 2 O 6 · n H 2 O, (0 < x <2) have been obtained, and they have been used as precursors for preparing silver antimonates. The ionic conductivity of the silver proton-exchanged samples as prepared is dominated by pr…
The novel concept of a “symmetry switch” for spin transfer is proposed. EHT and INDO calculations on a series of iron(III) porphyrin complexes indicate that factors that can contribute to the stability of the intermediate-spin state can be explained clearly with crystal-field theory. A decrease in symmetry causes the…
Macrocyclic structures such as 1 and rings with different polar substituents pointing inwards can be prepared by the intramolecular Glaser coupling of tetraacetylenes held covalently in position around a temporary template.
In situ, time-resolved energy-dispersive X-ray diffraction has been used to investigate the formation of the mesoporous silicates FSM-16 and MCM-41. The data suggest that the silica−surfactant mesophases formed are highly dependent on the reactant medium, the effect of the silica source being one of the main determini…
The formation of grid-type inorganic architectures of [2×2], [3×3], and [4×4] size (depicted here) occurs by self-assembly from lead(II) ions and ligands containing tridentate binding sites. Well-defined inorganic architectures of high complexity may thus be obtained in a single overall step by a spontaneous but contr…
Carbon-encapsulated Sn−Pb nanowires are generated by electrolysis of graphite in molten LiCl containing these metals. SA-EDX analyses indicate a distinctive profile for the metal cores in which Sn predominates at one end and Pb at the other of the individual nanowires; X-ray diffraction measurements reveal that separa…
The chemical dynamics of highly vibrationally excited molecules have been studied by measuring the quantum state-resolved scattering probabilities of nitric oxide (NO) molecules on clean and oxygen-covered copper (111) surfaces, where the incident NO was prepared in single quantum states with vibrational energies of a…
Time-resolved in situ X-ray diffraction measurements have been used to measure the rate of intercalation of lithium salts (LiX; X = Cl, Br, NO 3, OH, and SO 4 ) into Gibbsite (γ-Al(OH) 3 ) giving the layered double hydroxides [LiAl 2 (OH) 6 ]X· n H 2 O (X = Cl, Br, NO 3, and OH) and [LiAl 2 (OH) 6 ] 2 SO 4 · n H 2 O.…
The formation of SAMs on oxides and semiconductor surfaces has become a significant issue recently in its various technological applications. We report an easy and convenient method for the tailoring of an ITO surface with an amine functional group. A dense self-assembled monolayer of 1,12-diaminododecane was formed o…
Organic molecular Mott insulators, in which carriers are localized as a result of the electron correlation, showed nonlinear electric conduction upon application of a high electric field along the molecular stacking axis. The current-driven low-resistive state of potassium 7,7,8,8-tetracyanoquinodimethanane was stabil…
A Zr−Ce mixed oxide with ca. a 1:1 atomic ratio is prepared by a microemulsion method and studied by X-ray diffraction, transmission electron microscopy, and Raman, X-ray photoelectron (XPS) and electron paramagnetic resonance (EPR) spectroscopies. The results show the formation of a high surface area material ( S BET…