Materials Literature
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Imaging and focusing devices based on negative refractive index behavior of surface plasmon polaritons are described. These devices are based on two-dimensional plasmonic metamaterials consisting of alternating layers of positive and negative refractive indices, which are arranged in either layered or checkerboard fas…
Carbon-nanotube field-effect transistors are characterised using scanning photocurrent microscopy. The photocurrent response (see image), reflecting the strength of the local built-in electric field, depends on the applied source–drain bias and the charge-transport regime adjusted by the back-gate voltage. Such measur…
N-Acetylglucosamine-1-phosphate uridyltransferase (GlmU) catalyzes the first step in peptidoglycan biosynthesis in both Gram-positive and Gram-negative bacteria. The products of the GlmU reaction are essential for bacterial survival, making this enzyme an attractive target for antibiotic drug discovery. A series of Ha…
Conducting polymers within bioactive peptide amphiphile (PA) nanostructures are synthesized (see image). The approach relies on the ability of hydrophobic volumes within self-assembled structures to partition organic molecules from aqueous environments. Electron microscopy and electrochemical measurements indicate con…
Engineered surfaces with controlled hydrophilic/ hydrophobic character have been fabricated by tailoring the substrate topography and chemistry. In this method, the substrate to be treated was first coated by a photoresist, which was then surface-roughened using SF6 plasma etching. The resulting rough texture was then…
Zinc oxide (ZnO) is a wide-band-gap semiconductor with a range of potential applications in optoelectronics. The lack of reliable $p$-type doping, however, has prevented it from competing with other semiconductors such as GaN. In this Brief Report, we report the successful incorporation of nitrogen-hydrogen (N-H) comp…
Synthesis of complex metal oxide monoliths (MgAl 2 O 4, MgFe 2 O 4, and In 2– x Mg x O 3 ) with macropore frameworks through a novel single-source inorganic precursor route is successfully established. The synthesis approach mainly involves the formation of two-phase composite (desired complex metal oxide and MgO phas…
In this computational study, we used molecular dynamics and the embedded atom method to successfully reproduce the growth of gold nanorod morphologies from starting spherical seeds in the presence of model surfactants. The surfactant model was developed through extensive systematic attempts aimed at inducing nonisotro…
At neutral pH and 25 °C, the interaction of arsenate-bearing aqueous solutions with gypsum results in surface precipitation of pharmacolite (CaHAsO 4 ·2H 2 O) crystals. The crystals grow oriented onto the gypsum surface, forming an epitaxy. Using an A -centered unit-cell setting for both pharmacolite ( Aa ) and gypsum…
Raman spectra of individual pristine suspended single-walled carbon nanotubes are observed under high electrical bias. The LO and TO modes of the G band behave differently with respect to voltage bias, indicating preferential electron-phonon coupling and nonequilibrium phonon populations, which cause negative differen…
WO x /TiO 2 catalysts were synthesized by impregnating aqueous (NH 4 ) 2 WO 4 on hydrous titania nanotubes. The materials were annealed in air at 500 °C and characterized by X-ray diffraction (XRD), Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), high-angle annular dark-field scanning tra…
Colloidal silica templating synthesis was successfully used to prepare carbon monoliths with uniform spherical pores. Uniformity of the mesopores was assured by formation of a phenolic resin-type carbon precursor on the entire surface of a monolithic colloidal silica template pretreated with oxalic acid as a catalyst.…
We report a one-step solvothermal method to prepare magnetic hybrid copolymer–Co hierarchical hollow spheres by localized Ostwald ripening. The initial stage is the aggregation of primary inorganic nanoparticles whose surfaces are partially adsorbed by copolymer PEG–PPG–PEG to form solid spheres followed by hollowing…
Although neither SrTiO3 nor BaZrO3 has any polar crystalline polymorphs, they may form noncrystalline pyro- and piezoelectric phases [Adv. Mater. 19, 1515 (2007)10.1002/adma.200602149]. These phases and the similar phase of BaTiO3 have been called quasiamorphous. In this Letter, the structure of the quasiamorphous pha…
Abstract Superhydrophobic materials are currently used for their water‐repelling, self‐cleaning and anti‐fouling properties but are also potentially attractive to prevent snow or ice accumulation on exposed structures. Using the electrospinning technique, polymer mats made of polystyrene and poly[tetrafluoroethylene‐…
Single-wall carbon nanotubes (SWCNT) have attracted great interest for applications in a variety of research areas, including electronics and functional materials. However, a good dispersion of these materials in polymer matrices is a demanding factor in order to obtain more homogeneous and less bundled films for cons…
We report the peculiar behavior of the ${G}^{\ensuremath{'}}$ band Raman intensity, which is dependent on the metallicity of single-wall carbon nanotubes (SWCNTs). In the metallic SWCNTs, the ${G}^{\ensuremath{'}}$ band intensity was enhanced relative to the $G$ band intensity, while the ${G}^{\ensuremath{'}}$ band in…
Carbon nanotubes (CNTs), including single-walled CNT (SWCNT) and multi-walled CNT (MWCNT), have been regarded as the stiffest and strongest materials ever developed and are promising reinforcement fillers for developing nanocomposites. However, the scientific community has been puzzled about the reinforcement efficien…
Eine „grüne“ Oxidation: Ein hochaktiver Katalysator für die aerobe Oxidation von Alkoholen bei Umgebungsbedingungen ohne Basezusatz besteht aus Gold auf mesostrukturierten γ-Ga2O3/Al2O3-Trägern (siehe Bild). Die Aktivitätserhöhung wird auf die außergewöhnlichen Eigenschaften von Gallium-Mischoxiden bei der Dehydrierun…
Aqueous phase synthesis at 80 °C was carried out to synthesize lead sulfide (PbS) nanocrystals (NC) and microcrystals (MC) by using cationic twin-tail surfactants (TTS) such as 12-0-12, 10-2-10, 12-2-12, and 14-2-14 as capping agents in the concentration range from 0.1 −to 2 mM. The effect of hydrophobicity on the sha…