Materials Literature
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Abstract Polymeric antioxidants based on p ‐nonyl phenol formaldehyde resin (PNPF) and p ‐dodecyl phenol formaldehyde resin (PDPF) were prepared by the condensation reaction of the respective phenols with formaldehyde in the presence of an acid catalyst. The reactions were monitored by thin layer chromatography, and t…
The efficiency of dilute oxalic and citric acid solutions on improving the oxygen storage capacity (OSC) and catalytic activity of a severely aged (83,000 km) commercial three-way catalyst (TWC) has been investigated. Washing procedures applied after optimization of experimental parameters, namely, temperature, flow-r…
Solid oxide fuel cells are known to be able to handle a large variety of different fuels. Because of the greenhouse effect the use of carbon dioxide neutral gases or liquids are of special interest. In this context wood-gas has a big potential to be an alternative fuel for solid oxide fuel cells (SOFCs). The gas is ge…
The introduction of Mn ions into Cu(I)-ZSM-5 was found to lead to an enhancement of the photocatalytic activity for the direct decomposition of N2O into N2 and O2 at 298 K. Various in-situ techniques such as ESR, photoluminescence, XAFS as well as a combination of CO-FT-IR and CO-TPD measurements revealed that the acc…
Four kinds of stereoregular poly(muconic acid)s, which are synthesized by topochemical polymerization and subsequent solid-state hydrolysis, are used as the organic host materials for intercalation. We describe the reaction behavior and layered structure of intercalation compounds using stereoregular poly(muconic acid…
Abstract The imidization of poly(styrene‐ co ‐maleic anhydride) with amines may improve some of its end‐use properties. The objective of this study was to examine the mechanism and kinetics with aniline (ANL) as an amine of the preparation of poly(styrene‐ co ‐ N ‐phenyl maleimide). The reaction was carried out in a t…
A series of nitrosyl tris(5,10,15-aryl)corrolate complexes of iron(III) Fe(Ar3C)(NO) with different substituents on the aryl groups have been prepared, and certain spectroscopic and reaction properties were compared. The cyclic voltammetric analysis of the various Fe(Ar3C)(NO) complexes demonstrated that both the one-…
A series of new zwitterionic chromophores, picolinium quinodimethane (PQDM), exhibited an exceptionally large molecular hyperpolarizability (e.g., βzzz = 1930 × 10-30 esu). A guest−host polymer showed a high elecrooptic coefficient of 21 pm/V at 1550 nm and a good temporal stability over 700 h.
Single-walled carbon nanotubes are readily observable in a scanning electron microscope, which traditional models fail to explain. We present an ab initio model to explain how the electron beam can interact with these structures despite the very small, nanoscale, interaction volume. In particular, we show how the elec…
Abstract Microcellular foaming of biodegradable Bionolle in supercritical CO 2 has been produced. The effects of a series of variable factors, such as saturation temperature, saturation pressure, and depressurization time and step on the foam structures and density, were studied through measurement of density and SEM…
The crystal and magnetic structures of Laves-phase compound $({\mathrm{Nd}}_{0.5}{\mathrm{Tb}}_{0.5}){\mathrm{Co}}_{2}$ have been investigated by high resolution neutron powder diffraction at different temperatures. Magnetization measurement and neutron diffraction reveal two magnetic transitions at ${T}_{\mathrm{C}}\…
Abstract Organo‐Montmorillonite (Org‐MMT)/maleic anhydride grafted polypropylene (PP‐ g ‐MAH)/polypropylene nanocomposites have been prepared by melt blending with twin‐screw extruder. The mechanical properties of the nanocomposites and the dispersion of Org‐MMT intercalated by the macromolecular chain were investigat…
Abstract The formation of pentanuclear copper( II ) complexes with the mandelohydroxamic ligand was studied in solution by electrospray ionization mass spectrometry (ESI‐MS), absorption spectrophotometry, circular dichroism and 1 H NMR spectroscopy. The presence of lanthanide( III ) or uranyl ions is essential for the…
Abstract The effect of styrene–butadiene block copolymers (SB) with varying number of blocks and length of styrene blocks on the morphology, rheology, and impact strength of 4/1 polystyrene/low‐density polyethylene (PS/LDPE) blends was studied. The scanning and transmission electron microscopy and X‐ray scattering wer…
An uncooled infrared focal plane array (IR FPA) is a MEMS device that integrates an array of tiny thermal infrared detector pixels. An SOI diode uncooled IR FPA is a type that uses freestanding single-crystal diodes as temperature sensors and has various advantages over the other MEMS-based uncooled IR FPAs. Since the…
Two different algorithms to accelerate ray tracing in surface-to-surface radiation Monte Carlo calculations are investigated. The first algorithm is the well-known binary spatial partitioning (BSP) algorithm, which recursively bisects the computational domain into a set of hierarchically linked boxes that are then mad…
We have developed a new ternary polymeric system, poly(ethylene-alt-propylene) (PEP)/poly(butylene oxide) (PBO)/PEP-PBO, to study the complex phase behavior near the bicontinuous microemulsion phase channel. The molecular weights of the PEP and PBO homopolymers are 2600 and 3050 g/mol, respectively, and the copolymer…
A biohybrid system composed of neuronal cells and silicon-supported nanoporous membranes has been designed to facilitate control of the biochemical environment of neuronal networks with cellular resolution. The membranes may exhibit variable pore sizes and interpore distances and are interfaced to a microfluidic devic…
Abstract Besides hydrolysis, the physical properties of poly( L ‐lactic acid), PLLA, may change, at a shorter time‐scale, at physiological temperature, because of structural relaxation. This process may be relevant as it may contribute for the time‐dependent modifications of the mechanical performance of PLLA‐based im…
Mesenchymal stem cells (MSCs) are capable of differentiating into multiple cell lineages and are useful for therapeutic applications. Labeling the MSCs with fluorescent probes is beneficial in tracing the fate of MSCs after implantation. We have introduced the CdSe/ZnS quantum dots (QDs) into the human bone marrow MSC…