Materials Literature
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We propose deposition noise to be an important factor in unstable epitaxial growth of thin films. Our analysis yields a geometrical relation H=(RWL)^2 between the typical mound height W, mound size L, and the film thickness H. Simulations of realistic systems show that the parameter R is a characteristic of the growth…
Because of its chemical versatility and demonstrated biocompatibility, poly(2-hydroxyethyl methacrylate) (pHEMA) has been widely used as a polymer for biomedical applications. Since this hydrophilic material shows a poor interface with cells, blendings with other polymers were done to improve cytocompatibility. In our…
The effects of rheological change by addition of sodium carboxymethylcellulose (CMC) to culture medium in an air-lift-type fermentor on autotrophic production of poly-(D-3-hydroxybutyric acid) [P(3HB)] by two-stage culture of Alcaligenes eutrophus is investigated. Addition of 0.05% CMC increased P(3HB) production rate…
To develop rapidly biodegradable "stealth" nanoparticles, a physicochemical investigation was done on the formation of PEG-coated poly(isobutyl 2-cyanoacrylate) (PIBCA) nanoparticles. In particular, this study focused on the effect of polymerization conditions on particle size and surface properties, such as charge an…
Self-assembled monolayers (SAMs) of alkanethiols having CH3, PO4H2, COOH, CONH2, OH, and NH2 terminal groups formed on a gold surface via sulfur attachment were soaked in a simulated body fluid (SBF), whose ion concentrations were nearly equal to those of human blood plasma, at 37°C for up to 40 days. The effect of th…
The mechanical properties and structure of a human common carotid artery were studied in order to develop criteria for designing and manufacturing compliant textile vascular grafts. The arterial wall comprised a composite of elastin and collagen fibers with the collagen fibers crimped. This structure led to a unique p…
Rapid and controlled neoarterial regeneration via perianastomotic as well as transmural tissue ingrowth is critical to patency of implanted small-caliber artificial vascular grafts. Microporous polyurethane (PU) grafts (inner diameter, 1.5 mm; wall thickness, 100 microns; length, 20 mm; pore size, 100 microns), fabric…
Ab initio molecular dynamics calculations of deuterium desorbing from Si(100) have been performed in order to monitor the energy redistribution among the various D$_2$ and silicon degrees of freedom during the desorption process. The calculations show that a considerable part of the potential energy at the transition…
We present a molecular dynamics simulation study of the liquid-solid transition in a two dimensional system consisting of particles of two different sizes interacting via a truncated Lennard-Jones potential. We work with equal number of particles of each kind and the dispersity $Δ$ in the sizes of the particles is var…
Self-assembled monolayers (SAMs) of alkanethiols having CH3, PO4H2, COOH, CONH2, OH, and NH2 terminal groups formed on a gold surface via sulfur attachment were soaked in a simulated body fluid (SBF), whose ion concentrations were nearly equal to those of human blood plasma, at 37 degrees C for up to 40 days. The effe…
The local adsorption geometries of the (2x2)-N and the (sqrt(3)x sqrt(3))R30^o -N phases on the Ru(0001) surface are determined by analyzing low-energy electron diffraction (LEED) intensity data. For both phases, nitrogen occupies the threefold hcp site. The nitrogen sinks deeply into the top Ru layer resulting in a N…
Polycrystalline SrBi2Ta2O9 thin films having a layered-perovskite structure were fabricated by a modified metalorganic solution deposition technique using room temperature processed alkoxidecarboxylate precursor solution. It was possible to obtain a complete perovskite phase at an annealing temperature of 650 °C and n…
Abstract Während der vergangenen drei Jahrzehnte haben sich Oberflächenchemie und ‐physik mit ihren vielfältigen Bezügen auch zur Katalyse kräftig entwickelt. Im Zentrum der Studienaktivitäten standen über lange Zeit Metalloberflächen, auf die man die im Laufe der Zeit entwickelten oberflächenanalytischen Methoden in…
Using La0.5Sr0.5CoO3 (LSCO) or Pt film as a bottom electrode layer, epitaxial Bi4Ti3O12 (BTO) thin films were grown on MgO(001) substrates by pulsed laser deposition. A symmetric Pt/BTO/Pt capacitor structure shows a surprisingly large asymmetric polarization switching behavior, but a Pt/BTO/LSCO structure has a nearl…
A crack-free, transparent monolithic gel composed of 3 and 4 is obtained from silane 1 and carbodiimide 2. This is the first example of the application of the sol–gel process, which has frequently been used for the synthesis of oxidic glasses and ceramics, to nonoxidic systems for the preparation of oxygen-free Si-C-N…
Abstract Spiders have a bad reputation because of their predacious and hidden way of life. Nevertheless, they developed a finely tuned system, based on the use of venom and silk, which enabled them to compete successfully in evolution. Only recently has the mystery of the chemistry of their silk and venom begun to unr…
A new interpretation of the charge storage mechanism of conducting polymers is provided by the results of cyclic voltammetric studies of diphenylpolyenes like 1. For the first time these investigations indicate the formation of σ bonds in the reversible dimerization of radical cations of these conjugated systems. Furt…
Measurements of light scattered off a bubble that is illuminated by a train of short pulses enables one to resolve the strongly supersonic collapse of a sonoluminescing bubble. We find that the collapse is faster than Mach 4 (relative to the ambient speed of sound of the gas in the bubble) and that the flash of sonolu…
Template-controlled syntheses open the way to stable metal complexes of the previously unknown, energy-rich porphyrin structural isomer isoporphycene. The rapid photochemical equilibrium between (Z)- and (E)- octaethylisoporphycene Pd complexes 1 and 2 confirms the prediction that (Z)- and (E)-isoporphycene have simil…
Light diffraction from shear ordered colloidal dispersions is discussed in terms of the scattering power distribution I(l) along Bragg rods of hexagonal layers. For a charge stabilized dispersion the angle dependence of the light scattering intensity is used to determine I(l), from which conclusions on the mutual regi…