Materials Literature
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Proceedings of the 1st Central European Diatom Meeting Berlin-Dahlem, 23–25 March 2007 Botanic Garden and Botanical Museum Berlin-Dahlem, Freie Universität Berlin Kusber, W.-H. & Jahn, R. (ed.): Proceedings of the 1st Central European Diatom Meeting 2007 Berlin-Dahlem, 23–25 March 2007 ISBN 978-3-921800-63-8 Published…
Chemically compatible 50 vol% Al 2 O 3 –50 vol% YAG (yttrium aluminum garnet, Y 3 Al 5 O 12 ), 50 vol% Al 2 O 3 –50 vol% mullite, and 50 vol% Al 2 O 3 –50 vol% NiAl 2 O 4 , in situ , duplex composite powders were fabricated by a chemical synthesis method. Both amorphous and crystalline powders were synthesized. The ph…
Leakage current mechanism of the polycrystalline BiFeO3 film annealing at 923 K with Pt electrodes was discussed based on Schottky-emission conduction, Poole-Frenkel trap limited conduction, Fowler-Nordheim tunneling conduction and space charge limited current (SCLC). The leakage current mechanism at room temperature…
A new phosphorus-containing monomer, bis( N-hydroxyethyl-phthalimidyl)-bis(9,10-dihydro-9-oxa-10-oxide-10-phosphaphenanthrene-10-yl)methane, that contains preformed imide rings and flexible linking groups was synthesized. This compound was used to synthesize new phosphorus-containing polyesterimides by solution polyco…
We applied uniform in-plane tensile stress on PZTN ferroelectric thin films of 130 nm in thickness, using a four-point bending test rig and measured the corresponding changes in polarization and leakage current. An initial polarization hysteresis loop, which is different from the repeatable one after repetitive loadin…
We report that a 5 nm thick Al(2)O(3) film grown on Si(100) directly by sputtering exhibits strong (110) texture, accompanied by a shrunk lattice structure (Δd/d∼-2.36%). The disordered nature of the film was confirmed by cross-sectional high-resolution transmission electron microscopy, implying the loosened microstru…
Abstract Different approaches to the design of liquid crystals by using H‐bonds were analyzed. A selection of stilbazoles and pyridine compounds, with one or two chelating positions, were used as H‐acceptors in mixtures with carboxylic acids. The noncovalent complexes in question afforded calamitic mesomorphism (N, Sm…
Free or mesh-supported nanomats can easily be developed by this novel application of the electrospinning technique in which electrospun nanofibers are neutralized with a cloud of electrospray-generated small counterions. The fibers condense into dense micrometer-thick nanomats because of the attraction between opposit…
Two-dimensional arborols are bolaform amphiphiles in which a central, hydrophobic spacer separates twin hydrophilic ends. Under appropriate conditions, these relatively small molecules assemble into very long fibers; subsequently, the system gels if the arborol concentration is sufficiently high. The diffusion of line…
The incorporation of a small amount of salt in a block copolymer leads to strong modifications of the interfacial interactions, causing the microdomains to orient perpendicular to the surface during solvent evaporation. This approach can be used to prepare hexagonally ordered cylindrical arrays with high aspect ratios…
The Cu–ZnO catalyst precursors with variable Cu:Zn ratio, between Zn-rich and Cu-rich compositions have been investigated by a combination of electronic and vibrational spectroscopy. Synthesized catalyst precursors exhibit two d–d transition bands of Cu2+ ions in a distorted octahedral symmetry, at 7,600 and 12,900 cm…
There is currently significant interest in the field of ferroelectric thin film materials and devices, with a strong focus on the integration of thin films on Si-complementary metaloxide semiconductor (CMOS) for nonvolatile memory (Fe-RAM) applications. With dramatically high remnant polarization value, bismuth ferrit…
To improve the ferroelectric properties in BiFeO3, the effects of ion doping have been investigated. Currently, rare earth element substituted bismuth ferrites have attracted much attention for potential memory material. However, BFO materials are known to suffer from low resistivity and high leakage current. Particul…
A functioning dynamic memory device has been created using a polypyrrole composite material that contains immobilized anions and highly mobile cations in the form of a thin film spanning two metal electrodes in an interdigitated electrode array configuration. Dynamic asymmetric electronic behavior based on the movemen…
Abstract Gold nanoparticles with hydrophobic polystyrene (PS) and hydrophilic poly[poly(ethylene glycol) methyl ether methacrylate] (PPEGMA) mixed polymer brushes are prepared. Different morphologies of the nanoparticles can be observed in chloroform (a common solvent for both of the polymers) and water (a precipitant…
One stable form (Form I) and two metastable forms (Forms II and IV) of p -methylchalcone have been obtained, with Form II having previously been reported to be a disappearing polymorph. To prevent the conversion of Form II, which has a melting point of 89–91 °C, into the stable form it was produced in conditions free…
Abstract This paper describes F‐based dry etching and resulting surface properties of biocompatible silicone elastomer. The etch rate of polysiloxane and surface morphology was found to be highly temperature dependent. An increase in temperature results in a significantly higher etch rate and a lower surface roughness…
Picolinamide (PA) and isonicotinamide (INA), two structural isomers of pyridinecarboxamide, have been investigated by matrix isolation and low-temperature solid-state infrared spectroscopy, combined with UV (lambda > 235 nm) photoexcitation and density functional theory and ab initio (MP2) theoretical studies. In cons…
In this report, plasma-enhanced atomic layer deposition (PEALD) technique was used to deposit dielectric Ga2O3 thin films at various temperatures (50, 150, and 250°C) on p-type Si (100) and quartz substrates with an alternating supply of reactant source, [(CH3)2GaNH2]3, and oxygen plasma of 150 W. The growth temperatu…
Abstract A hydrophilic glycopolyamide homopolymer is described, consisting of a tertiary polyamide backbone and D ‐glucose side chains, which upon direct dissolution in water can self‐assemble into spherical vesicles and nanofibers. Based on TEM, SFM, and SAXS data, it is proposed that the nanofibers are hollow nanotu…