Materials Literature
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Abstract TiO 2 nanorods (NRs) and γ‐Fe 2 O 3 nanocrystals (NCs) passivated with unsaturated long‐chain carboxylic acids, namely 10‐undecylenic acid (10UDA) and oleic acid (OLEA), are covalently anchored to Si(100) at room temperature by UV‐light‐driven reaction of hydrogenated silicon with the carbon–carbon double bon…
In this report the decomposition and oxidation kinetics of thiourea dioxide and thiourea trioxide are investigated with a reversed-phase ion-pair high-performance liquid chromatography (HPLC) method. The HPLC method allows us to simultaneously determine and quantify several sulfur-containing reagents such as (NH2)2CSO…
A complete model for the simulation of vinyl chloride batch suspension polymerization reactors, capable of calculating pilot-scale and industrial-scale reactors, is developed. The model solves the mass balances and moment equations, on one hand, and the energy balances for the suspension, reactor wall, and cooling jac…
Abstract Biodegradable blends of poly(propylene carbonate) (PPC) and poly(ethylene‐ co ‐vinyl alcohol) (EVOH) were melt compounded in a batch mixer followed by compression molding. The processability, mechanical properties, thermal behavior, and morphologies of the blends were investigated with torque rheometer, Fouri…
Encapsulated ${\mathrm{C}}_{70}$ molecules packed in single-walled carbon nanotubes display different orientations depending on the nanotube radius. We present x-ray scattering data obtained on a powder of nanotubes filled with ${\mathrm{C}}_{70}$ molecules. Analytical expressions for calculating the diffraction diagr…
Synthesis, absorption spectra and luminescebce properties of a series of lanthanide trisbipyridine cryptates Ln within R-Bpy x R-Bpy x R-Bpy, where Ln = Eu, Gd and R = H, COOH, COOCH3, CONH(CH2)2NH2 are described. Comparison of the unsubstituted parent compound with the substituted compounds shows that bipyridine subs…
We present a two-step homogenization method for composite metamaterials. First, each layer of wires or resonators is homogenized as a slab with negative permittivity or permeability, respectively. Second, the single negative stack which results is homogenized to form the effective medium. Comparing the predictions of…
Small molecule, large structures: The connection of two zwitterionic binding motifs with a lipophilic alkyl linker results in an amphiphilic bis-zwitterion, which forms self-assembled vesicles even in polar solutions. The data suggest that two bis-zwitterions dimerize and then further aggregate to form vesicles, most…
Using density-functional theory, we investigate the stability of the half-metallic ground state of magnetite under different strain conditions. The effects of volume relaxation and internal degrees of freedom are fully taken into account. For hydrostatic compression, planar strain in the (001) plane and uniaxial strai…
Chain walking polymerization provides a novel strategy to synthesize highly branched high-molecular-weight polyethylenes with controllable chain topologies ranging from linear to hyperbranched dendritic structure. In this work, we report the performance of this novel series of polyethylenes as lubricant viscosity-inde…
Efficient alignment of aqueous carboxyl-functionalized multiwalled carbon nanotubes having remanent iron catalyst particles are carried out in relatively low external magnetic fields ( B ≤ 1017 mT). The nanotubes were grown by catalytic chemical vapor deposition and then functionalized in a multistep oxidation process…
Schalen über Schalen: Einfaches Variieren der Konzentration des Tensids Cetyltrimethylammoniumbromid in einem Templatprozess führt zu ein-, zwei-, drei- und vierschaligen hohlen Cu2O-Kügelchen (siehe Bild). Es ist also möglich, die Synthese vielschaliger anorganischer Hohlkügelchen durch (multilamellare) Vesikel zu st…
Calixarene-Ti complexes were grafted onto SiO2 (0.18-0.24 Ti nm-2) to form isolated and accessible Ti centers persistently coordinated to multidentate calixarene ligands. Grafted Ti-tert-butylcalix[4]arenes gave Ti K-edge absorption spectra with pre-edge features at 4968.6-4968.9 eV, independently of Ti surface densit…
Charge build-up at the solid/aqueous interface is a ubiquitous phenomenon that determines the properties of interfacial electrical double layers. Due to its unique properties, the surface of diamond offers an attractive platform to investigate charging mechanisms in aqueous solutions. We investigate the surface charge…
"Smart tattoo" sensors-fluorescent microspheres that can be implanted intradermally and interrogated noninvasively using light-are being developed as potential tools for in vivo biochemical monitoring. In this work, a platform for enzymatic tattoo-type sensors is described and prototype devices evaluated using glucose…
Molecular junctions of metal/molecule/metal were fabricated with silver nanoparticles and functional molecules through layer-by-layer self-assembly techniques. The Raman scattering of the interconnecting molecules between the silver nanoparticles can be greatly enhanced. For the silver/4-aminothiophenol/silver (Ag/PAT…
Abstract A poly(methyl methacrylate) (PMMA) and nanoclay composite was dispersed into polystyrene (PS) using a twin‐screw extruder. The mixture was then batch foamed with supercritical CO 2 . It was found that the cell density of foams based on the blend is higher than that based on the weight average of the two pure…
The reaction mechanism for the decomposition of nitrous oxide (N 2 O) on hydroxylated and dehydroxylated binuclear oxygen bridged extraframework iron sites in Fe-ZSM-5 has been studied using density functional theory. The results show that if two charge exchange sites in the zeolite are in close proximity, two isolate…
Dielectric spectra of the polyester poly(propylene succinate) were measured upon crystallization. For this model aliphatic polyester the alpha and beta relaxations appear simultaneously and are well resolved in the experimental frequency window. During isothermal crystallization, this fact allows one to use the beta r…
A procedure that enables determining the reaction rate from the analysis of fluorescence anisotropy is described and applied to the investigation of double hydrogen transfer between inner-cavity nitrogen atoms in electronically excited porphycene. Tautomerization proceeds as a thermally activated synchronous double hy…