Materials Literature
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Die Biomineralisation von Siliciumdioxid in Diatomeen führt zu komplexen Zellwandstrukturen (siehe SEM-Bild) und hängt von strukturgebenden Matrizen ab, die durch die elektrostatische Zusammenlagerung positiv geladener Polyaminderivate und Polyanionen gebildet werden. Die untersuchten Peptide bilden eine Familie biolo…
Abstract Electrospinning was used to fabricate mats of poly(vinyl alcohol) (PVA; M w = 72,000 Da, degree of hydrolysis ≈ 97.5–99.5) nanofibers from PVA solutions in reverse osmotic water. The effects of solution concentration, applied electrical potential, sonication, and collection distance on morphological appearanc…
Core–multishell nanoparticles: Near-IR-resonant rhodamine-encapsulated poly(lactic-co-glycolic acid) (PLGA)–Mn/Au half-shell nanoparticles (NPs; see figure) are developed by depositing metal multilayers on PLGA NPs. These NPs can be used for photothermally controlled drug delivery and magnetic resonance imaging. Upon…
Studies of electron energy loss spectroscopy and selected area electron diffraction (SAED) were systematically performed on 15 and $25\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%$ lanthanide (Ln)-doped ceria samples ($\mathrm{Ln}=\mathrm{Sm}$, Gd, Dy, and Yb), through which the local ordering of…
Novel isomeric fluorine-boron complexes with donor-acceptor architecture have been efficiently synthesized and well characterized. Significant features, such as strong solid and liquid fluorescence, unusual large Stokes shifts, and lower LUMO levels and higher HOMO levels, are observed in these potential multifunction…
More decorative than wallpaper: Silica biomineralization in diatoms leads to intricate structures in the cell wall (see SEM image) and depends on structure-directing templates formed by the electrostatically driven assembly of positively charged polyamine derivatives and polyanions. The title peptides are a family of…
We have investigated the hydrogen absorption/desorption hysteresis by means of in situ powder X-ray diffraction (XRD) and solid-state 2 H NMR to clarify the location of hydrogen, surface or body, and its chemical form, molecular, atomic, or as hydride. The present results point out that strongly trapped hydrogen atoms…
We present the results of the modelling of CO adsorption and catalytic CO oxidation on inhomogeneous Pt(100) surfaces which contain structurally different areas. These areas are formed during the CO-induced transition from a reconstructed phase with hexagonal geometry of the overlayer to a bulk-like (1x1) phase with s…
The forces between colloidal particles at a decane-water interface, in the presence of low concentrations of a monovalent salt (NaCl) and the surfactant sodium dodecyl sulfate (SDS) in the aqueous subphase, have been studied using laser tweezers. In the absence of electrolyte and surfactant, particle interactions exhi…
A real contrast: Multifunctional fluorescent and paramagnetic mesoporous silica nanorods can be used to label both phagocytic and nonphagocytotic cells. The cells can be detected simultaneously by a fluorescence technique and the T1- or T2-weighted modes of magnetic resonance imaging (see picture).
In this contribution, a series of shape-controllable ZnO nanostructures were synthesized in ionic liquids by a simpler, only one-step, low-temperature route, and characterized by XRD, XPS, TEM, HRTEM, SAED, EDXA, SEM, FTIR, surface area measurement and photoluminescence. We mainly investigate the effect of cations of…
In this paper we establish the temperature dependence of the kinetic coefficient associated with crystal growth into the supercooled liquid for a wide range of organic and inorganic materials. We show that the kinetic coefficient for crystal growth scales with the shear viscosity eta as eta(-xi) and that the exponent…
This work presents several metallosupramolecular coordination polyelectrolytes (MEPEs) self-assembled from rigid, pi-conjugated, pyridine ring functionalized bisterpyridines and metal ions. The MEPEs are water-soluble and display different colors spanning the entire visible regions. Optical, electrochemical, and elect…
Silveirinha and Engheta have recently proposed that electromagnetic waves can tunnel through a material with an electric permittivity (epsilon) near zero (ENZ). An ENZ material of arbitrary geometry can thus serve as a perfect coupler between incoming and outgoing waveguides with identical cross-sectional area, so lon…
With the emergence of manufactured nanomaterials, it is urgent to carry out researches on their potential environmental impacts and biological effects. To better understand the potential ecotoxicological impacts of metal oxide nanoparticles released to aquatic environments, the zebrafish 96-h embryo-larval bioassay wa…
Carbon nanotubes (CNTs) with diameters ranging from 40 to 100 nm have been synthesized by the solvothermal process using ethanol as a carbon source and LaNiO3 as catalyst. The synthesized CNTs can be used for filaments in high-impact polystyrene (HIPS). HIPS/CNT nanocomposites have been prepared by the melt–intercalat…
New red‐ and green‐emitting phosphors, AY 1− x P 2 O 7.5 : x RE 3+ (A=Ca and Sr; x =0.01, 0.03, 0.05, 0.10; RE=Eu and Tb) were synthesized by the conventional ceramic route and their photoluminescence properties under near‐ultraviolet (UV) irradiation were investigated. It was found that CaYP 2 O 7.5 : Eu 3+ phosphor…
A temperature-dependent structural investigation of the substituted argyrodite Ag(7)GeSe(5)I has been carried out on a single crystal from 15 to 475 K, in steps of 50 K, and correlated to its conductivity properties. The argyrodite crystallizes in a cubic cell with the F\bar 43m space group. The crystal structure exhi…
A method for manufacturing embedded variable capacitors (varactors) inside a low-temperature cofired ceramic substrate is presented. A varactor is fabricated by filling a via hole with ferroelectric barium strontium titanate paste. The measured capacitance of the varactor changed from 1.47 to 0.97 pF and the Q factor…
Uniform cake‐like YBO 3 :Eu 3+ assemblies were successfully synthesized by a poly(vinylpyrrolidone)‐assisted hydrothermal method. The products were characterized by X‐ray diffraction, scanning electron microscopy, and photoluminescence spectroscopy. The results revealed that these particles were actually composed of m…