Materials Literature
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A novel high-throughput method was used to determine the effect of chain extender composition on the mechanical properties of segmented poly(urethane−urea)s. Combinatorial libraries with continuous gradients in chain extender composition (60 < φ < 160 mol % stoichiometry), cure temperature (70 < T < 110 °C), or both w…
The degradation of porous methyl silsesquioxane (MSQ) films (k=2.2) by plasma irradiation has been investigated using several kinds of gas chemistries, which are used for photoresist strip. The porous MSQ is easily degraded by O2 plasma ash process and the dielectric constant increases largely, even by using the condi…
Hydrothermal reaction of H(3)PO(3), CH(3)NH(2), zinc(II) acetate, 4,4'-bipyridine (bipy), and (NH(4))(6)Mo(7)O(24).4H(2)O at 180 degrees C led to a novel organic-inorganic layered hybrid, [CH(3)NH(3)][H(2)bipy][Zn(4)(bipy)(3)(H(2)O)(2)Mo(V)(8)Mo(VI)O(36)(PO(4))].4H(2)O (1). Its structure was established by single-crys…
Uniform donut-like assemblies of YBO 3:Eu 3+ were obtained via a simple hydrothermal method, in the absence of any surfactant or template. These microparticles were actually composed of orderly aggregated nanosheets and exhibited improved chromaticity compared with the bulk. After controlled postcalcination, the micro…
Reiche Ernte: Mithilfe eines Organogel-Mediums wurde ein lichtsammelndes System für sichtbares Licht hergestellt (siehe Bild; Einschub: verschiedene Gelmischungen). Durch Mischen von vier unterschiedlichen Perylen-Derivaten in der Gelphase wird ein Energiegradient in den Gelfibrillen erzeugt. Die Nanofasern sammeln di…
By manipulating the crystallization conditions of C-methyl recorcinarene, a motif of self-assembled helical nanotubes held together by extensive π⋅⋅⋅π interactions is obtained. The tube, depicted (red=O, white=H, gray=C), has an exo-functionalized hydrophilic outer surface capable of complex formation with cationic or…
To identify the nature and the local structure of the surface of supported catalyst nanoparticles, we have performed a detailed comparative study of CO adsorption on two categories of oxide-supported Palladium catalysts: (1) polycrystalline MgO and γ-Al 2 O 3 supported Pd metal catalysts prepared by impregnation techn…
The structure of ${\mathrm{V}}_{2}{\mathrm{O}}_{5}$ nanotubes has been experimentally determined. The approach of the atomic pair distribution function technique was employed because of the limited structural coherence in this nanophase material. It has been found that even a nanocrystal with the complex morphology of…
Theory of the remote Coulomb impurity scattering in single--wall carbon nanotubes is developed within one--electron approximation. Boltzmann equation is solved within drift--diffusion model to obtain the tube conductivity. The conductivity depends on the type of the nanotube bandstructure (metal or semiconductor) and…
In protein crystallization, screening is initially performed to obtain an indication of the conditions under which a macromolecule might crystallize. These preliminary conditions are then optimized to produce (in a perfect world) well diffracting crystals; this process of optimization often involves fine grid screenin…
PURPOSE: Calotropis gigantea R. Br. (Asclepiadaceae) a wildly growing plant has been reported to possess number of medicinal properties and other purposes. The purpose of the present study was to evaluate scientifically the anti-diarrheal effects of C. gigantea used traditionally in Indian system of medicine using cas…
The hydrothermally synthesized 1D homochiral nickel aspartate oxide [Ni2O(l-Asp)(H2O)2].4H2O is based on infinite helical chains of edge- and corner-sharing nickel octahedra. It represents the first example of a chiral one-dimensional compound with an extended helical TM-O-TM subnetwork synthesized as an optically pur…
Since publication of the main contributions on the theory of kinetic roughening more than fifteen years ago, many works have been reported on surface growth or erosion that employ the framework of dynamic scaling. This interest was mainly due to the predicted existence of just a few universality classes to describe th…
It is well known that the physical properties of some transition-metal compounds (mostly oxides) are strongly affected by intra-atomic correlations. Very recently, investigations of the adsorption of small molecules such as CO on the surfaces of transition-metal oxides have led to rather surprising results: the weak a…
Before molecular imaging with MRI can be applied clinically, certain problems, such as the potential sparseness of molecular epitopes on targeted cell surfaces, and the relative weakness of conventional targeted MR contrast agents, must be overcome. Accordingly, the conditions for diagnostic conspicuity that apply to…
A series of polymer-coated Au nanoparticles have been prepared using the "grafting-to" approach. Thiol-terminated polystyrene and poly(ethylene oxide) ligands are found to form dense brushes on the faceted gold nanoparticle surfaces. Depending on the polymer, the ligand grafting densities on the gold nanoparticles are…
Powders of single-crystalline β-nickel hydroxide (β-Ni(OH) 2 ) nanosheets with the hexagonal structure have been successfully synthesized by the hydrothermal method at 200 °C using nickel acetate as the nickel source and aqueous ammonia as both an alkaline and complexing reagent. The yields of β-Ni(OH) 2 nanosheet pow…
A rich harvest: A visible-light-harvesting system has been created utilizing an organogel medium (see picture; the inset shows different gel mixtures). Mixing four different perylene derivatives in the gel phase sets up an energy gradient in the gel fibrils. The well-defined nanofibers harvest a wide range of light en…
Magnetic, magneto-transport properties and electronic specific heat coefficient of the Mn 2 Sb 0.88 Ge 0.12 compound have been studied. A metamagnetic transition from antiferromagnetic to ferrimagnetic, which is induced by an external field, is accompanied with a large negative magnetoresistance (MR) effect. The MR ra…
Lipids are the main constituents of biological cell membranes, and their liquid crystalline properties play a crucial role in cell functions. We have discovered that dodecyl-beta-D-glucopyranoside glycolipid layers can be electrically polarized in supramolecular structures of glycolipid and bent-core ("banana-shape")…