Materials Literature
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Host-guest interactions between the periphery of adamantylurea-functionalized dendrimers (host) and ureido acetic acid derivatives (guest) were shown to be specific, strong and spatially well-defined. The binding becomes stronger when using phosphonic or sulfonic acid derivatives. In the present work we have quantifie…
Abstract Diesel particulate filter (DPF) behavior depends strongly on the microstructural properties of the deposited soot aggregates. In the past the issue of the growth process of soot deposits in honeycomb ceramic filters has been addressed under nonreactive conditions, and the influence of the filter operating con…
Most practical reactions that occur in synthesizing or processing materials are heterogeneous. These include oxidation, reduction reactions, dissolution of solids in liquids, and most solid-state phase transformations. Consider the oxidation of a metal by exposure of a solid metal to an atmosphere with a finite partia…
We develop a theory of the Auger neutralization rate of ions on solid surfaces in which the matrix elements for the transition are calculated by means of a linear combination of atomic orbitals technique. We apply the theory to the calculation of the Auger rate of ${\mathrm{He}}^{+}$ on unreconstructed Al(111), (100),…
Crystallographic characterization of the metastable alkynyl complexes [Au 6 Ag 13 (μ-dppm) 3 (μ 3 -η 1 -C⋮CC 6 H 4 R-4) 14 ] 5+ (R = H ( 1a ), CH 3 ( 2a ), Bu t ( 3a )) is described. Photolysis of the green Au 6 Ag 13 alkynyl complexes in solutions allows isolation of the red Au 5 Ag 8 products [Au 5 Ag 8 (μ-dppm) 4 {…
Glutathione (gamma-glutamyl-cysteinyl-glycine; GSH) is ubiquitous biological tripeptide with multiple functions and possible therapeutic uses. The oxidized disulfide form (GSSG) self-assembles into fibrillar aggregates and gels in organic solvents, but not in solvent mixtures with high water content. Here, the disulfi…
Grazing-angle of incidence small-angle X-ray scattering (GISAXS) and high-resolution field emission scanning electron microscopy have been used to characterize the mesophase symmetry, orientation, and long-range order in PEO20-PPO70-PEO20 (Pluronic P123) templated mesoporous silica thin films on conducting gold substr…
We introduce an experimental method to crystallize ensembles of non-Brownian spheres confined in narrow containers. The method is based on programmed vibrations and a cooling procedure (annealing). Starting with a granular gas, the system slowly relaxes into a solid ordered structure: Body-centered-tetragonal and face…
Abstract Glycidyl methacrylate (GMA) functionalized acrylonitrile‐butadiene‐styrene (ABS) copolymers have been prepared via an emulsion polymerization process. The epoxy‐functionalized ABS (e‐ABS) particles were used to toughen nylon‐6. Molau tests and FTIR results showed the reactions between nylon‐6 and e‐ABS have t…
Abstract Summary: Polytetrafluoroethylene (PTFE) surfaces were treated by oxygen and nitrogen species generated either in a remote (filtered) RF plasma or in an ion gun. In the first case, the majority of the species reaching the surface are neutral molecules, whereas in the second case, ions are the reactive agent. I…
Abstract Blends of an amorphous and a semi‐crystalline polymer—polystyrene and polypropylene, respectively—were prepared by melt processing in an extruder at 220°C. These polymers are known to be immiscible and the composite morphologies were characterized by electron microscopy and thermal analysis. Fine micron‐scale…
We investigate structural order in glassy water by performing classical molecular dynamics simulations using the extended simple point charge (SPC/E) model of water. We perform isochoric cooling simulations across the glass transition temperature at different cooling rates and densities. We quantify structural order b…
We report the preparation, characterization, and mechanical properties of polyelectrolyte/phosphorus dendrimer multilayer microcapsules. The shells of these microcapsules are composed either by alternating poly(styrenesulfonate) (PSS) and positively charged dendrimer G4(NH+Et2Cl-)96 or by alternating poly(allylamine h…
Abstract High transparent and homogeneous poly(vinylidene fluoride) (PVdF)/silica hybrids were obtained by using an in‐situ interpenetrating polymer network (IPN) method. The simultaneous formation of PVdF gel resulting from the physical cross‐linking and silica gel from sol–gel process prevented the aggregation of PV…
Abstract Polyaniline (PANI) doped with p ‐toluene sulfonic acid was synthesized by chemical polymerization method using (NH 4 ) 2 S 2 O 8 as an oxidizing agent. This is a single step polymerization process for the direct synthesis of the conducting emeraldine salt (ES) phase, without the need of doping, dedoping, and…
We investigate the origin of charge density wave (CDW) formation in insulators by studying BaIrO3 using high-resolution (1.4 meV) photoemission spectroscopy. The spectra reveal the existence of localized density of states at the Fermi level, E(F), in the vicinity of room temperature. These localized states are found t…
The enzymatic transformation into an oligomer was carried out with the objective of developing the chemical recycling of bacterial polyesters. Poly(R-3-hydroxyalkanoate)s (PHAs), such as poly[(R-3-hydroxybutyrate)-co-12%(R-3-hydroxyhexanoate)] and poly[(R-3-hydroxybutyrate)-co-12%(R-3-hydroxyvalerate)], were degraded…
Nützliche Defekte: Reaktive η1-Superoxid- und Peroxidspezies bilden sich an Einelektronendefektstellen der Grenzfläche zwischen Goldnanoclustern und nanokristallinem CeO2−x. Diese Intermediate oxidieren auf Gold adsorbiertes CO zu CO2. Die reaktiven Sauerstoffspezies entstehen auf nanokristallinem CeO2−x (siehe Bild),…
The formation of a plumbate network in binary lead silicate glasses was examined based on the leaching behavior of Pb 2+ in lead silicate glasses over a wide composition region. The effective diffusion coefficient of Pb 2+ at 40°C was on the order of 10 −17 m 2 /s for PbO<35 mol% glasses, and increased three orders…
Core–shell colloids with two well-differentiated sides (see Figure) have been produced by a combination of electron beam evaporation (EBE) and polyelectrolyte-driven layer-by-layer (LbL) assembly. The colloids are patterned with different optical and magnetic functionalities through deposition of silica-coated gold na…