Materials Literature
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Thin, freestanding porous metal films bearing a dense two-dimensional array of submicroscopic pores were prepared by covering the surface of porous polymeric membranes with a gold/palladium alloy and subsequently removing the polymeric template (see picture). The polymeric membrane itself was prepared on a water surfa…
We show in simulations that a rich variety of interesting orderings such as pinwheel and star states can be realized for colloidal molecular crystal mixtures at rational ratios of the number of colloids to the number of minima from an underlying periodic substrate. These states can have multistep melting transitions a…
Data on the synthesis, structure and physicochemical properties of liquid-crystalline ionomers, a new class of mesomorphous polymeric compounds, are summarised. The main classes of the liquid-crystalline ionomers studied to date (including comb-like and linear) and liquid-crystalline chelato-telechelic polymers are co…
Core-shell Au-Pt nanoparticles were synthesized by using a seed growth method and characterized by transmission electron microscopy, X-ray diffraction, and UV-vis spectroscopy. Au(core)-Pt(shell)/GC electrodes were prepared by drop-coating the nanoparticles on clean glassy carbon (GC) surfaces, and their electrochemic…
A fine mechanical analysis of a polycrystalline material subjected to large stresses must distinguish between intergranular and crystalline matter because they have different mechanical properties. Homogeneity is an illusion at the grain level. It is shown that a grain boundary under the action of a strong enough in-p…
In this study, gypsum, a common amendment for sodic soil reclamation, was compared with langbeinite, a lesser used and known mineral. A column leaching experiment using sodic water was conducted on a sodic, non-saline soil (fine, montmorillonitic, thermic Ruptic Vertic Albaqualf) dominated by smectitic clays. Soil was…
Die Kopf-Schwanz-Selbstorganisation zweier Imidazolylphthalocyaninatozink(II)- oder -magnesium(II)-Einheiten durch wechselseitige Imidazol-Metall-Wechselwirkungen führt zu stark fluoreszierenden Dimeren (siehe Bild, ΦF=Fluoreszenzquantenausbeute) mit Assoziationskonstanten, die auf über 1011 M−1 in Toluol geschätzt wu…
Este trabalho teve como objetivo estudar os efeitos das espécies e adição de parafina nas propriedades de painéis OSB. Foi concluído que as espécies estudadas são homogêneas entre si e produzem painéis de qualidade semelhante, a adição de parafina melhora substancialmente a estabilidade dimensional dos painéis. Os pai…
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…