Materials Literature
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The electronic and magnetic properties of oxidized zigzag and armchair graphene nanoribbons, with hydrogen passivated edges, have been investigated from ab initio pseudopotential calculations within the density functional scheme. The oxygen molecule in its triplet state is adsorbed most stably at the edge of a zigzag…
We report the results of charge transport studies on single CdTe nanocrystals contacted via evaporated Pd electrodes. Device charging energy, E c, monitored as a function of electrode separation drops suddenly at separations below approximately 55 nm. This drop can be explained by chemical changes induced by the metal…
Schutzüberzug: Glycodendrimere können als homogene bioaktive Beschichtungen genutzt werden, um die Zytotoxizität von einwandigen Kohlenstoffnanoröhren (SWNTs) abzuschwächen. Die bifunktionellen Glycodendrimere (siehe Bild) weisen periphere Kohlenhydrateinheiten und eine Pyren-Endgruppe auf, die über π-π-Wechselwirkung…
Chalcopyrite CuInS 2 is an important photovoltaic material. CuInS 2 hollow nanospheres with diameters of 80−100 nm have been synthesized by a surfactant-assisted solution-chemical route. Structural characterization indicated that shells of the hollow spheres are composed of CuInS 2 nanoparticles of about 10 nm in size…
Abstract Alkyl pyridinium, 1‐vinyl alkyl imidazolium, 1,3‐dialkyl imidazolium, and tetraalkyl phosphonium bromides were successfully used as intercalants for the preparation of highly thermally stable organophilic montmorillonites. Nanocomposites of linear low density polyethylene (LLDPE) and linear low density polyet…
X-ray and neutron fiber diffraction has been used to study cellulose as it is converted from its naturally occurring crystal phase, cellulose I, to an activated crystal phase, cellulose III I , by ammonia treatment. The detailed crystal structures determined for cellulose I β , an intermediate ammonia-cellulose I comp…
We present a novel multifunctional magnetic Ag nanoshell with sandwichlike nanostructure, which is composed of a yolk−egg-like magnetic silica core and a continuous Ag nanoshell coating. First, yolk−egg-like magnetic silica was prepared by a facile one-step sol−gel method to embed the magnetic nanoparticles at the bou…
Pure and o -nitroaniline (O-NA) doped benzil single crystals were grown by the slow cooling solution growth method. The doping of O-NA is associated with the strong interaction between the guest and host molecules by the hydrogen bonding. Incorporation of O-NA in the lattice enhances the crystallinity. The nonlinearit…
Starker Ring: Der Cyclohexamer-Templat-Komplex 3, der durch templatgestützte Trimerisierung des Porphyrindimers 2 mit dem Hexapyridyltemplat 1 erhalten wurde, ist enorm stabil (Kf=7×1038 M−1). Dennoch kann der freie Makrocyclus 4 mithilfe von Aminliganden freigesetzt werden. Nach spektroskopischen Befunden und DFT-Rec…
We investigate the surface-enhanced Raman scattering (SERS) of rhodamine 6G (R6G) adsorbed on Au nanoparticles attached to InP nanowires. We find that nanowire arrays act as frameworks for effective SERS substrates with a significantly higher Raman signal sensitivity than a planar framework of Au nanoparticles adsorbe…
We here report systematic study of structural dynamics of a 16-residue self-assembling peptide d-EAK16 made of only D-amino acids. We compare these results with its chiral counterpart L-form, l-EAK16. Circular dichroism was used to follow the structural dynamics under various temperature and pH conditions. At 25 degre…
Dislocation model of strain anisotropy is presented. The dislocation theorem of strain broadening is suggested which means that strain broadening can only be caused by dislocation-type lattice defects. Based on this theorem strain anisotropy is modeled and accounted for by assuming that strain broadening is caused by…
In the design of nanotube-based fluidic devices, a critical issue is the effect of the induced vibrations in the nanotube arising from the fluid flow, since these vibrations can promote structural instabilities, such as buckling transitions. It is known that the induced resonant frequencies depend on the fluid flow ve…
Nanoporous thin films were prepared from poly(ethylene oxide)- b -poly(methyl methacrylate)- b -polystyrene (PEO- b -PMMA- b -PS) ABC triblock copolymer by solvent annealing under high relative humidity followed by UV degradation and acid washing. Ordered half-spheres at the surface that template ordering of spheres b…
Fiber glass has been used widely in manufacturing industries, especially marine industries, because of low cost and high strength. However, glass fiber can cause acute irritation to the skin, eyes, and upper respiratory tract. This study looked at the possibility of substituting glass fiber with natural fiber in compo…
A new method has been developed to prepare exfoliated poly(methyl methacrylate)/clay nanocomposites by in situ polymerization of methyl methacrylate (MMA) in the presence of triethylaluminum (TEA)-modified clay. The dispersed behavior of the clay in the PMMA matrix is identified by using X-ray diffraction (XRD), trans…
Polarized photoluminescence excitation spectroscopy on individual SWNTs reveals not only the longitudinal and transverse E 11, E 22, and E 12 ground-state excitons but also excited excitonic states including the continuum. When heated, SWNTs are known to undergo a bandgap shift transition (BST), which effectively chan…
The preparation and characterization of a large-scale epitaxial array of single-crystalline CuO nanowires (NWs) on the surface of a Cu nanostructure (Cu−CuO nanocomposite) by a simple liquid−solid growth process at room temperature is demonstrated. The field-emission scanning electron microscopy image analysis indicat…
In recent years, magnesium alloys have been proposed as a new class of metallic bioabsorbable implant material. Unfortunately, hydrogen gas evolution and an increase in alkalinity are both byproducts of the degradation process. This necessitates the development of magnesium alloys with controlled degradation rates. Th…
Supramolecular rotators of hydrogen-bonding assemblies between anilinium (Ph-NH 3 (+)) or adamantylammonium (AD-NH 3 (+)) and dibenzo[18]crown-6 (DB[18]crown-6) or meso-dicyclohexano[18]crown-6 (DCH[18]crown-6) were introduced into [Ni(dmit) 2] salts (dmit (2-) is 2-thioxo-1,3-dithiole-4,5-dithiolate). The ammonium mo…