Materials Literature
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Mehr als eine hübsche Struktur: Wasserdispergierbare Hybrid-Nanoröhren wurden als desymmetrisierendes Agens zur Erzeugung von Janus-Nanopartikeln bestehend aus einem hydrophoben sphärischen Kern mit einseitig angebrachten, wasserlöslichen Polymerketten genutzt (siehe Schema). Die Janus-Micellen selbstorganisieren zu S…
We describe the spontaneous photoinduced patterning of azo-dye polymer films. We have observed that the illumination of an azo-dye polymer film by a uniform single laser beam with normal incidence leads to a self-structurization process that results in the formation of well-ordered submicrometer-sized structures whose…
We have studied the electronic structure of the Ni triangular lattice in NiGa(2)S(4) using photoemission spectroscopy and subsequent model calculations. The cluster-model analysis of the Ni 2p core-level spectrum shows that the S 3p to Ni 3d charge-transfer energy is approximately -1 eV and the ground state is dominat…
Electron paramagnetic resonance (EPR) investigations were carried out on hybrid core−shell nanocomposites based on silicon carbide nanoparticles (SiC) and polyaniline (PANI) doped with camphor sulfonic acid (CSA). Charge carrier concentrations and thermal activations in low and high conducting polymers arranged as thi…
We use density functional theory to study the capillary phase behaviour of a discotic system of colloidal platelets that are confined in a planar slit pore. The model plates have circular shape, continuous orientations and vanishing thickness; they interact via hard-core repulsion with each other and with the walls wh…
Schon in niedrigen Konzentrationen wirkt der im Schema gezeigte Pinzettenkomplex bei einer Reihe organischer Lösungsmittel als Gelbildner. π-Stapelung der Heteroaren-Einheiten, Van-der-Waals-Wechselwirkungen zwischen den langkettigen Alkylgruppen und Metall-Metall-Wechselwirkungen sind an der Aggregation beteiligt. De…
The universal stress protein (Usp) superfamily encompasses a conserved group of proteins involved in stress resistance, adaptation to energy deficiency, cell motility and adhesion, and is found in all kingdoms of life. The paradigm usp gene, uspA, of Escherichia coli is transcriptionally activated by a large variety o…
The mesoscopic inhomogeneity of conducting polymer films obtained by electropolymerization and spin-coating was studied using Kelvin probe force microscopy (KFM) and current-sensing atomic-force microscopy (CS-AFM). A well-pronounced correlation was established between the polymer morphology, on the one hand, and its…
Eines der größten Polywolframate, das 20 Cer(III)-Atome enthaltende Wolframatogermanat [Ce20Ge10W100O376(OH)4(H2O)30]56− (1), wurde durch Reaktion von CeIII-Ionen mit der trilakunaren polyanionischen Vorstufe [α-GeW9O34]10− in wässriger Lösung synthetisiert. Das Polyanion 1 ist das erste Lanthanoid-substituierte Wolfr…
We study the requirements imposed on organic photochromes for two-photon absorption (2PA) terabyte volumetric optical storage. We present a quantitative model of signal-to-noise ratio (SNR) and signal-to-background ratio (SBR) when 2PA-induced photochromic switching is used for writing, and 2PA-induced fluorescence is…
We study experimentally the liquid-solid transition in a soft-jammed system and focus on its aging in the solid regime. We investigate the impact of temperature, density, and load changes on the material behavior. We show that all elastic modulus versus time curves fall on a single master curve when rescaled by an app…
We investigate the van der Waals--London dispersion interactions between a single-walled carbon nanotube immersed in water and interacting with three different objects: an optically isotropic planar substrate, an optically anisotropic planar substrate, and another single-walled carbon nanotube of identical chirality.…
The structural, electronic, and magnetic properties of mixed-valence compounds are believed to be governed by strong electron correlations. Here we report benchmark density-functional calculations in the spin-polarized generalized-gradient approximation (GGA) for the ground-state properties of doped CaMnO(3). We find…
An enzymatic synthesis route to peptide-capped gold nanoparticles has been developed. Gold nanoparticles were synthesized using alpha-NADPH-dependent sulfite reductase and phytochelatin in vitro. The gold ions were reduced in the presence of the enzyme sulfite reductase, leading to the formation of a stable gold hydro…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTAlternative o-Quinodimethane Cross-Linking Precursors for Intramolecular Chain Collapse NanoparticlesTeresa A. Croce, Sharon K. Hamilton, Matthew L. Chen, Hubert Muchalski, and Eva HarthView Author Information Department of Chemistr…
We demonstrate that the optical absorption of zigzag-edge graphene nanoribbons is qualitatively different from that of armchair nanotubes. Unlike the selection rule for nanotubes, when the incident beam is polarized along the longitudinal direction, the interband transitions at direct gaps are forbidden for graphene n…
Extremely thin films of poly(styrene) (h<or=6 nm), in the geometry of "model" nanocomposites, show a continuous increase of the capacitance with temperature. This phenomenon is discussed in terms of a gradual defreezing of the interfacial zone between the so-called dead layer and the bulk. Such a mechanism shows a str…
We analyze the performance of two different core-hole potentials in the theoretical modeling of XAS of ice, liquid and gas phase water; the use of a full core-hole (FCH) in the calculations, as suggested by Hetenyi et al. [J. Chem. Phys. 120 (18), 8632 (2004)], gives poor agreement with experiment in terms of intensit…
Astrocytes are the principle macroglial brain cells. They are activated by different stressors and brain injuries. Quantum dots (QDs) can cause oxidative stress. This study shows a real-time imaging of primary cortical cultures and assessment of QD-induced activation of astrocytes in the brains of transgenic mice with…
Left-handed metamaterials make perfect lenses that image classical electromagnetic fields with significantly higher resolution than the diffraction limit. Here we consider the quantum physics of such devices. We show that the Casimir force of two conducting plates may turn from attraction to repulsion if a perfect len…