Materials Literature
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<div class="htmlview paragraph">To meet stringent 2010 NOx emissions, many manufacturers are expected to deploy urea selective catalytic reduction systems. Indications from ARB are that a threshold monitor must be developed to monitor their performance. The most capable monitoring technology at this time relies…
Carbons with slitlike pores can serve as effective host materials for storage of hythane fuel, a bridge between the petrol combustion and hydrogen fuel cells. We have used grand canonical Monte Carlo simulation for the modeling of the hydrogen and methane mixture storage at 293 K and pressure of methane and hydrogen m…
By using the specifically designed multigap nanoelectrodes, we demonstrated an effective approach for the simultaneous dielectrophoretic separation and assembly of metallic and semiconducting single-walled carbon nanotubes (SWNTs). An approximate metallic-semiconducting-metallic multiarray structure was created by an…
Abstract This work reports a study of the adsorption of fibrinogen (Fgn) onto the surface of semi‐interpenetrating polymer networks (IPNs) of poly(ethylene glycol) (PEG) and poly(2‐hydroxyethyl methacrylate) (PHEMA). The semi‐IPNs were prepared by polymerizing 2‐hydroxyethyl methacrylate with a redox system and in the…
Electronic structure of double-wall carbon nanotubes (DWNTs) consisting of two concentric graphene cylinders with extremely strong covalent bonding of atoms within the individual graphitic sheets, but very weak van der Waals type interaction between them is calculated in the terms of the linear augmented cylindrical w…
Silica gel coatings on methyltrimethoxysilane (MTMS)-derived monoliths have been studied using wetting transition. Wetting transition is observed in a small confined space, where a coating solution phase-separates into a well-coarsened dimension, making all the phase-separating polymerizing silica phase dynamically fl…
When an initially stretched rubber band is suddenly released at one end, an axial-stress front propagating at the celerity of sound separates a free and a stretched domain of the elastic material. As soon as it reaches the clamped end, the front rebounds and a compression front propagates backward. When the length of…
A study is made of veneer failure by cracking in all-ceramic crown-like layer structures. Model trilayers consisting of a 1 mm thick external glass layer (veneer) joined to a 0.5 mm thick inner stiff and hard ceramic support layer (core) by epoxy bonding or by fusion are fabricated for testing. The resulting bilayers…
Unter Dach und Fach: Eine Verkapselungsmethode ohne Polykationen liefert nichtkomplexierte, kurze Oligonucleotidketten in hoher Konzentration, eingeschlossen in monodisperse, abbaubare Mikrokapseln. Eine Kapsel kann mehr als 104 Oligonucleotidketten enthalten, und über 90 % der Kapseln sind mit DNA gefüllt. Die Kapsel…
The coarsening process in a two-dimensional hexagonal system in the region close to both spinodal and order-order transitions was investigated through the Cahn-Hilliard model. We found a distinctive region of the phase diagram where the pinning of dislocations plays only a minor role and the dynamics is led by the tri…
In this work, a procedure based on the use of boundary and temperature diagrams for selecting safe and productive operating conditions of homogeneous semibatch reactors is presented and the influence of the reaction kinetics on the shape and extension of such diagrams is discussed. It has been found that using correla…
Preparations, crystal structures, and spectral and magnetic properties of two new chiral one-dimensional cyano-bridged coordination polymers, [Cu(II)L2]M(II)(CN)].2H2O (M(II) = Ni(II) (1) and Pt(II) (2), L = trans-cyclohexane-(1R,2R)-diamine) have been presented. Complex 1 crystallizes in the monoclinic P2(1) space gr…
The defects in CdTe and CdSe nanocrystals were studied by comparing the photoluminescence spectra and cyclic voltammetry dependences, which enabled us to identify two main electron levels in CdTe and four in CdSe NCs. In CdTe nanocrystals these levels are: a hole trap at the energy E V + 0.5 eV and an electron trap at…
L'effet du vieillissement thermique sur les proprietes mecaniques du polyethylene reticule chimiquement (PRC), utilise dans l'isolation des câbles de haute tension, a ete etudie. Nous avons montre que l'allongement a la rupture et la resistance a la traction du polymere diminuent en fonction du temps de vieillissement…
We investigated the structural, magnetic, and transport properties of polycrystalline doping systems ${\mathrm{La}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ru}}_{x}{\mathrm{O}}_{3}$ $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.15)$ with ferromagnetic matrix and ${\mathrm{La}}_{0.45}{\math…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
I don't like what I am: An example of ring-size change in tetrapyrroles is found in the ring expansion of corroles to porphyrins (see scheme). These and other recently discovered relationships between tetrapyrrole structures offer the possibility of rapid autoconversion of such macrocycles.
Self-immolative dendrimers disassemble through a domino-like chain fragmentation initiated by a single cleavage at the dendrimer core. We have designed and synthesized dendritic molecules that resemble dendritic architectures present in nature. The unique design allows a cleavage signal received by any one of the mult…
The molecular recognition properties of the hydrogen bonding segments in biodegradable thermoplastic elastomers were explored, aiming at the further functionalization of these potentially interesting biomaterials. A poly(epsilon-caprolactone)-based poly(urea) 2 was synthesized and characterized in terms of mechanical…
Multiscale modeling of a polymeric system is a challenging task in polymer physics. Here we introduce a bottom-up and then top-down scheme for the simulation of polyethylene (PE). The coarse-grained numerical potential for PE is derived through an automatic updating program by mapping its radial distribution function…