Materials Literature
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Abstract The paper studies the utilization of attenuated total reflectance–Fourier transformed infrared (ATR–FTIR) and Raman spectroscopy to investigate isothermal semi‐batch precipitation of a model compound, L ‐glutamic acid. ATR–FTIR spectroscopy was mainly used for in‐line monitoring of the solution phase and Rama…
This work reports on the fabrication and characteristics of n-ZnO/p-GaN and n-ZnO/n-MgZnO/n-ZnO/p-GaN heterojunction light emitting diodes (LEDs). Both devices exhibited diode-like rectifying current-voltage characteristics. Room temperature electroluminescence (EL) spectra for both LEDs consisted of dominant emission…
Lösliche Modellverbindung: Eine molekulare Entsprechung der kürzlich vorgestellten Wasserstoffspeicherform [{Ca(NH2BH3)2}n] wurde untersucht. Der in Kohlenwasserstoffen lösliche Calcium-Amidoboran-Komplex spaltet bei sehr niedrigen Temperaturen von 20–40 °C spontan H2 ab (siehe Schema). Als Zersetzungsprodukt entsteht…
A short, high-yielding route to omega-dithiafulvenylpolyenals (1) via the corresponding iminium salts (2) and starting from trimethyl-1,3-dithiolium tetrafluoroborate is reported. The Knoevenagel reactions of either 1 or 2 with isoxazolone-containing acceptors afford merocyanines 7 and 9, in a process that is often ac…
The fasciculation and elongation protein Zeta 1 (FEZ1) is the mammalian orthologue of the Caenorhabditis elegans protein UNC-76, which is necessary for axon growth. Human FEZ1 interacts with Protein Kinase C (PKC) and several regulatory proteins involved in functions ranging from microtubule associated transport to tr…
Wasserabweisend: Die Selbstorganisation von Oligo(p-phenylenvinylenen) (OPVs) auf Kohlenstoffnanoröhren (CNTs) verleiht diesen Dispergierbarkeit in organischen Lösungsmitteln, sodass sie zur Beschichtung von Glas-, Metall- und Glimmeroberflächen genutzt werden können. Dabei resultieren superhydrophobe selbstreinigende…
The formation of amorphous calcium carbonate particles from supersaturated aqueous solution is relevant to many processes in nature and industry. The present work introduces time-resolved static light scattering as a new tool to investigate the initial stage of this process. The process is initiated by mixing a soluti…
Abstract To assess and predict the functional life of a natural rubber engine mount compound, the mechanical property changes were determined under accelerated aging conditions. The rubber was aged at temperatures ranging from 70 to 110°C for times ranging from 1 h to 5 weeks. Tensile and fatigue measurements were use…
Abstract. We study the tunneling of chiral electrons in graphene through a region where the electronic spectrum changes from the usual linear dispersion to a hyperbolic dispersion, due to the presence of a gap. It is shown that contrary to the tunneling through a potential barrier, the transmission of electrons is, in…
Abstract BACKGROUND: Conductive polymer composites (CPCs) can be obtained by filling polymer matrices with electrically conductive particles, and have a wide variety of potential applications. In the work reported, the biodegradable polymer poly(lactic acid) (PLA) as a partially miscible blend with poly(propylene carb…
Abstract In this study, the effect of rheological behavior of epoxy during precuring on foaming was investigated. Dynamic time sweep test of epoxy/curing agent (100/1, w/w) was conducted. The viscosities as a function of time showed extremely rapid increase from the order of 10 2 –10 3 to 10 6 Pa · s at a certain time…
A key to the elucidation of protein functions are water–protein interactions. The determination of polarization-transfer pathways between water and immobilized proteins demonstrates that chemical exchange (sometimes followed by spin diffusion) is the dominant mechanism. At low temperatures or high spinning frequencies…
Abstract A method for the preparation of COOH functionalized conducting copolymer films; toward the ultimate goal of developing resistance‐based sensing platforms, is presented. The method involved vapor phase copolymerization of pyrrole with a monomer containing the COOH functionality, thiophene‐3‐acetic acid (TAA)…
Abstract Effect of oil palm empty fruit bunch (OPEFB) fiber and poly(methyl acrylate) grafted OPEFB on several mechanical properties of poly(vinyl chloride)/epoxidized natural rubber (PVC/ENR) blends were studied. The composites were prepared by mixing the fiber and the PVC/ENR blends using HAKEE Rheomixer at the roto…
Abstract Organic polymers that contain ligated metals offer a variety of unique properties which include luminescence, electro‐ and photochemistry, catalysis, charge, magnetism, and thermochromism. These organic–inorganic hybrid materials have the potential to offer novel active matrixes for advanced devices. Continue…
High-fidelity surface functional group (e.g., N-hydroxysuccinimide (NHS) reactive ester) patterning is readily and reliably achieved on commercial poly(ethylene glycol) (PEG)-based polymer films already known to exhibit high performance non-fouling properties in full serum and in cell culture conditions. NHS coupling…
We have studied the temperature dependence of W(110) soft x-ray angle-resolved photoemission spectra excited at photon energies of 260 and 870 eV and between 300 and 780 K. The experimental results have been compared to both a free-electron final-state model and theoretical one-step model calculations of the photocurr…
Incorporation of carbon at the molecular level can create unusual amorphous and nanostructures of Si–C–O polymer‐derived ceramics by controlled pyrolysis of crosslinked polysiloxanes. These ceramics can resist crystallization to ultrahigh temperatures. In this work, we support earlier studies that the resistance to cr…
Abstract Underwater plasma and glow discharge electrolysis are interesting new methods for polymer surface functionalization. The achievable content of O‐containing functional groups exceeds that of oxygen glow discharge gas plasmas by a factor of two (up to ca. 56 O/100 C). The percentage of OH groups among all O‐con…
Abstract Polyaniline‐polypyrrole (PANI‐PPy) nanofibers with high aspect ratios have been synthesized by a one‐step, surfactant‐assisted chemical oxidative polymerization from mixtures of aniline (An) and pyrrole (Py) monomers. PANI‐PPy nanofibers synthesized with an excess of either PANI or PPy show similar spectral (…