Materials Literature
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The biofunctionalization of materials creates interfaces on which proteins, cells, or tissues can fulfill native or desired tasks. Here we report how to control the assembly of type I collagen into well-defined nanoscopic matrices of different patterns. Collagen fibrils in these ultrathin (approximately 3 nm) matrices…
In $\mathrm{Sm}\text{\ensuremath{-}}\mathrm{Co}∕\mathrm{Fe}$ exchange-spring magnet films, the magnetization reversal processes of constituent elements and layers were studied with an emphasis on the role of diffused Co atoms. Enhanced coupling effectiveness was observed in a film with a graded interface where signifi…
Individual multiwalled carbon nanotubes with a range of aspect ratios are subjected to cyclic axial compression to large strains using atomic force microscopy. Distinct elastic buckling and post-buckling phenomena are observed reproducibly and are ascribed to Euler, asymmetric shell buckling (i.e., kinking), and symme…
The influence of H 2 O 2 in the preparation of nanocrystalline CeO 2 has been investigated by treating solutions of Ce(III) with NaOH in the presence of different concentrations of H 2 O 2 . The resulting precipitated material was then examined by a range of techniques, including transmission electron microscopy (TEM)…
Phragmatopoma Californica builds a tubular dwelling by gluing bits of sand and seashell together underwater with a proteinaceous adhesive. In the lab, the animals will build with 0.5 mm glass beads. Two spots of glue with a consistent volume of about 100 pL each are deposited on the glass beads before placement on the…
Films of multiwall carbon nanotubes (MWCNTs) grown by thermal chemical vapor deposition were studied using small-angle X-ray scattering (SAXS). We assessed the extent of alignment of carbon nanotubes (CNTs) by examining relative SAXS intensities as a function of azimuthal angle. We also identified features in the SAXS…
Two novel glucoconjugated silicon(IV) phthalocyanines (compounds 3 and 4) have been prepared and examined for their photophysical and biological properties. With two axial 1,2:5,6-di-O-isopropylidene-alpha-d-glucofuranose substituents linked to the silicon center through the tetraethylene glycol chain, both compounds…
We study the layer-by-layer (LbL) deposition of a pair of strong polyelectrolytes within the nanopores of track-etched membranes, for pore diameters ranging from ∼50 to 850 nm. The end-to-end distance of the polyelectrolyte chains in solution was varied from 10 to 50 nm by selecting polyelectrolytes of low and high mo…
Vascular tissue possesses numerous nanostructured surface features, but most metallic vascular stents proposed to restore blood flow are smooth at the nanoscale. Thus, the objective of the present study was to determine in vitro vascular cell functions on nanostructured titanium (Ti) compared to conventional commercia…
In ein Polymer eingeschlossene Goldnanocluster (PI-Au) wurden durch Einkapseln von Goldnanoclustern und Vernetzen eines Polystyrol-Copolymers hergestellt (siehe TEM-Bild). Die Nanocluster katalysieren die aerobe Oxidation von Alkoholen zu Aldehyden und Ketonen unter Atmosphärendruck bei Raumtemperatur, und sie konnten…
On and off and on again: High-quality CePO4:Tb3+ nanowires were prepared easily in high yields at room temperature. The resulting 1D nanostructures exhibit Ce3+-sensitized terbium(III) luminescence (green). Oxidation of Ce3+ results in an absence of energy transfer (ET) from Ce4+ to Tb3+ and thus no green emission of…
In actuator applications, a degradation of the ferroelectric material occurs both under unipolar cycling as well as DC loads. The developing material state is characterized by measurements of large and small signal unipolar as well as bipolar hysteresis loops. While the unipolar loops indicate a small decrease in stra…
Abstract The controlled synthesis of one‐dimensional, two dimensional, and three‐dimensional CuO nanostructures has been achieved by a hydrothermal process in the presence of sodium citrate (SC) by simply controlling the reaction conditions. When the molar ratio of sodium citrate to CuSO 4 · 5H 2 O (represented by SC/…
Materials scientists have become increasingly interested in combining natural and synthetic polymers into hybrid polymeric structures. The functionality of (fragments of) biopolymers can be integrated with the synthetic versatility and adaptability of synthetic polymers, thus creating a new class of materials harnessi…
We present thermoelectric measurements on pentacene field-effect transistors. We report high values of the Seebeck coefficient at room temperature between 240 and $500\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{V}∕\mathrm{K}$ depending on the dielectric surface treatment. These values are independent of the thi…
Lead-free piezoelectric K 0.5 Na 0.5 NbO 3 thin films for microelectromechanical systems were fabricated via chemical solution process using metal alkoxide. Perovskite K 0.5 Na 0.5 NbO 3 (KNN) single-phase thin films with good leakage current properties were successfully prepared by optimizing the K x Na x NbO 3 ( x ≧…
We analyze the collective mode spectrum of graphene nanoribbons within the random phase approximation. In the undoped case, only metallic armchair nanoribbons support a propagating plasmon mode. Landau damping of this mode is shown to be suppressed through the chirality of the single particle wave functions. We argue…
Cooperative crystals: In ferroelectric cocrystals of iodanilic acid (see picture, orange) and 5,5′-dimethyl-2,2′-bipyridine (green), the molecules are linked into polar chains by OH⋅⋅⋅N and N+H⋅⋅⋅O− hydrogen bonds. The application of a small electric field (E) effects a cooperative proton transfer across the hydroge…
We present a bond-order potential (BOP) for the bcc transition metal tungsten. The bond-order potentials are a real-space semiempirical scheme for the description of interatomic interactions based on the tight-binding approximation. In the hierarchy of atomic-scale-modeling methods the BOPs thus provide a direct bridg…
Understanding the fundamental properties of polymeric liquids remains a challenge in materials science and soft matter physics. Here, we present a simple and computationally efficient criterion for topological constraints, i.e., uncrossability of chains, in polymeric liquids using the dissipative particle dynamics (DP…