Materials Literature
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We report the first asymmetric synthesis of trans optically active (+) C 2 1,3-bisarylepoxide of calix[4]arene in excellent chemical yield and >99% ee, and its enantiospecific conversion to the corresponding bis-dioxolane.
The differential conductivity of the domains of a phase segregated diblock copolymer film, polystyrene-block-poly (ferrocenylethylmethylsilane) (PS-b-PFEMS), is described using conducting-probe atomic force microscopy. The schematic on the right depicts the experimental setup, and the image on the left is a representa…
The solution phase behavior of short, strictly alternating multiblock copolymers of type (A(n)B(n))(m) was studied using lattice Monte Carlo simulations. The polymer molecules were modeled as flexible chains in a monomeric solvent selective for block type A. The degree of block polymerization n and the number of diblo…
Abstract— The use of ZnO nanostructures in various display applications is reported. Single‐crystalline vertically oriented nanowires with typical diameters of 100 nm and a length of 1–2 μm were grown at deposition temperatures below 100°C. Homogeneous growth over areas up to 50 cm 2 on Si as well as on various metall…
Abstract Thin films of poly(ethylene terephthalate) (PET) having a thickness of 100 μm were exposed to different ion fluence of swift heavy ions of carbon in the range of 5 × 10 11 – 5 × 10 13 ions/cm 2 . The effect of ion beam on structural and electrical modification has been studied by UV/vis, FTIR, X‐ray diffracti…
A facile electrochemical approach was developed for the controllable synthesis of bismuth hexacyanoferrate(II) (BiHCF(II)) nanoplates. The composition, morphology, and structure of the as-prepared BiHCF(II) nanoplates were characterized by the techniques such as infrared spectrum, thermogravimetry, inductively coupled…
A shorter lifetime: The photoluminescence (PL) lifetime of intracellular thiol-capped CdTe quantum dots (QDs) varies greatly depending on the intracellular environment. The fluorescence image shows localization of the QDs (red) and lysosomes (green) in a human hepatocellular carcinoma (QGY) cell. The PL decay of the Q…
Abstract Large‐scale orthorhombic V 2 O 5 single‐crystalline nanowires with diameters of 60–80 nm and lengths into the millimeter range were synthesized through a facile template‐free, mild, and direct hydrothermal reaction between VOSO 4 · x H 2 O and KMnO 4 . The nanowires are nearly visible to the naked eye and are…
Trigonal-planar, middle transition metal diiminato-imido complexes do not exhibit high-spin states, as might be naively expected on the basis of their low coordination numbers. Instead, the known Fe(III), Co(III), and Ni(III) complexes exhibit S = 3/2, S = 0, and S = 1/2 ground states, respectively. Kohn-Sham DFT calc…
For the first time the surface of brass (Cu−Zn alloy) and its chemistry have been characterized by scanning tunneling microscopy/spectroscopy at the subnanometer (atomic) scale. The comparative results obtained on Cu 70 Zn 30 (111) and Cu(111) single-crystal surfaces evidence the random distribution of Zn atoms substi…
Integral equation theory with a hybrid closure approximation is employed to study the equilibrium structure of highly size asymmetric mixtures of spherical colloids and nanoparticles. Nonequilibrium contact aggregation and bridging gel formation is also qualitatively discussed. The effect of size asymmetry, nanopartic…
The Perspective “Structural nano-composites” (Y. Dzenis, 25 January, p. 419) describes a quest for improved structural materials and indicates that composites with nanoscale reinforcements would have “exceptional mechanical properties.” Is this true? Why would reinforcements that are small
Amorphous carbonaceous char produced from burning polymer solids has insulating properties that make it valuable in thermal protection and fire-retardant systems. A pyrolytic molecular dynamics simulation method is devised to study the transformation of the local microstructure from virgin polymer to a dense, disorder…
Abstract To chemically bond polymer and organoclay, low molecular weight trimethoxysilyl‐modified polybutadiene (Silane) was used in this study. When Silane was added, ethylene‐vinyl acetate copolymer (EVA)/ethylene‐1‐butene copolymer (EtBC)/methyl tallow bis‐2‐hydroxyethyl quaternary ammonium‐modified montmorillonite…
We use the contactless time-resolved microwave conductivity (TRMC) technique to investigate the photoconductance of CdS-coated mesoporous TiO 2 and ZrO 2 . The CdS domains were grown directly on the surface of the oxide by a chemical bath deposition method. Mobile charge carriers are generated with a low yield followi…
Abstract Atomistic simulation techniques have been used to investigate the dissociative adsorption of water on the (110), (111), and (100) low index surfaces of CeO 2 , as well as a so-called “trench” surface configuration. Several different coverages of water have been considered to better understand how the hydroxyl…
Abstract Linear and hyperbranched poly(ether‐ketone)s (PEKs) containing flexible oxyethylene spacers grafted multiwalled carbon nanotube (PEK‐ g ‐MWNT) nanocomposites were prepared by direct Friedel‐Crafts acylation as the polymer forming and grafting reaction. To achieve the composites, in situ polycondensations of A…
Hydrogen interactions with undefective and defective graphitic structures were investigated by first-principles simulations. Structural vacancies were identified to promote the dissociation of molecular hydrogen with a reduced activation barrier of $0.63\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, compared to $2.38\phanto…
Wasserabweisend: Fluorierte polyedrische oligomere Silsesquioxane (POSS) wurden durch einstufige basenkatalysierte Kondensation von Trialkoxysilanen erhalten. Die octameren fluorierten Polyeder sind löslich, themisch stabil und hydrophob mit statischen Wasserkontaktwinkeln bis 154°. Das Fluordecyl-POSS weist vermutlic…
UV-curable monomers provide an ideal mixture for the fabrication of composite materials containing single-walled carbon nanotubes (SWNTs) in terms of dispersion stability and excellent processablity. Precise patterns of SWNT composites on a sub-micrometer scale have been manufactured by nanoimprint lithography using a…