Materials Literature
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Arbitrary dual-band microstrip components using composite right/left-handed (CRLH) transmission lines (TLs) are presented. Theory, synthesis procedure, and implementation of the dual-band quarter-wave (/spl lambda//4) CRLH TL are presented. Arbitrary dual-band operation is achieved by the frequency offset and the phas…
Crystallographic texturing of polycrystalline ferroelectric ceramics offers a means of achieving significant enhancements in the piezoelectric response. Templated grain growth (TGG) enables the fabrication of textured ceramics with single crystal-like properties, as well as single crystals. In TGG, nucleation and grow…
Abstract This article gives an overall view of the mechanisms involved in the mesostructuring that takes place during the formation of surfactant‐templated inorganic materials by evaporation. Since such a method of preparation is well suited to fabricating thin films by dip coating, spin coating, casting, or spraying,…
To learn how to mimic the Lotus effect, superhydrophobicity of a model system that resembles the Lotus leaf is theoretically discussed. Superhydrophobicity is defined by two criteria: a very high water contact angle and a very low roll-off angle. Since it is very difficult to calculate the latter for rough surfaces, i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrafast Excited-State Dynamics in Nucleic AcidsCarlos E. Crespo-Hernández, Boiko Cohen, Patrick M. Hare, and Bern KohlerView Author Information Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43214 Cite this: Chem. Rev. 2004, 104, 4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of Alcohols with Molecular Oxygen on Solid CatalystsTamas Mallat and Alfons BaikerView Author Information Institute for Chemical and Bioengineering, Swiss Federal Institute of Technology, ETH Hönggerberg, HCI, CH-8093 Zurich, Switzerland Cite this: Chem. Rev. 2004,…
Stripping or removal of bitumen from an aggregate because of water penetrating into the interface causes many pavements to fail. Stripping has been existent since the advent of paving technology. It causes functional weakening of pavements leading to costly repairs. This state-of-the-art paper deals with important con…
The crystal structures of dimagnesium disodium decavanadate icosahydrate, Mg(2)Na(2)V(10)O(28).20H(2)O, (I), and trimagnesium decavanadate octacosahydrate, Mg(3)V(10)O(28).28H(2)O, (II), have been determined by single-crystal X-ray diffraction. They crystallize with monoclinic (C2/c) and triclinic (P-1) symmetry, resp…
Hard chromium electroplating is extensively used by aircraft manufacturers and military maintenance depots to provide wear and/or corrosion resistance or to restore dimensional tolerance to components. However, chrome plating utilizes hexavalent chromium, which is a highly toxic carcinogen, and increasingly stringent…
We demonstrate herein the formation of a free-standing gold nanoparticle membrane and its use in the immobilization of the enzyme, pepsin. The nanogold membrane is synthesized by the spontaneous reduction of aqueous chloroaurate ions at the liquid-liquid interface by the bifunctional molecule bis(2-(4-aminophenoxy)eth…
The silicon backbone conformation in poly(di- n -butylsilane) (PDBS) has been shown to be a 7/3 helix at ambient conditions, which is in marked contrast to the near-planar conformation of its homologous polymers with side chain lengths of one to three or six to eight carbon atoms. In this work, both the 7/3 helical an…
The glass-forming liquid crystal isopentylcyanobiphenyl (CB15) filled with different concentrations of hydrophilic and hydrophobic aerosils has been investigated by broadband dielectric spectroscopy in the frequency range from 10(-2) Hz to 10(7) Hz over a temperature range of 173 K-300 K. CB15 that consists of chiral…
Monte Carlo simulations for a simple model liquid crystal are presented. The influence of flat walls on the phase behavior is analyzed for two different anchoring mechanisms, one favoring homeotropic alignment and one simulating a twisted nematic cell without external fields, e.g., two walls with different homogeneous…
The dimensionless thermoelectric figure-of-merit, ZT , of Bi 2 Te 3 based alloys was investigated under a large temperature difference using a recently reported ‘open/short circuit’ measurement technique. It is shown that the measured ZT decreases with an increase in temperature difference. Theoretical analysis indica…
A method of synthesizing bulk amounts of single-walled carbon nanohorns (SWNHs) on a significant low-cost basis is proposed based on the 'arc in water' method with N 2 injection into the arc plasma. It is elucidated that rapid quenching of the carbon vapour in an inert gas environment is necessary to form the delicate…
Trägerfixierte Gold-Nanopartikel sind nicht nur bereits bei niedrigen Temperaturen, sondern zudem auch in Gegenwart von Feuchtigkeit katalytisch hoch aktiv. Feuchtigkeit erhöht ihre katalytische Aktivität bei der Oxidation von CO über Au/TiO2, Au/Al2O3 und Au/SiO2 bei 273 K um bis zu zwei Größenordnungen, und der Effe…
We have prepared a pillared layer magnetic material containing a noncoordinated aromatic molecule, [{MnII(pyrimidine)(H2O)}2{MnII(H2O)2}{WV(CN)8}2](pyrimidine)2.2H2O. This compound has one-dimensional channels (6.2 x 2.1 A) that are occupied by noncoordinated pyrimidine. The magnetization versus temperature plots show…
Two diblock copolymers composed of polystyrene and a liquid crystalline azobenzene-containing polymethacrylate were used as model systems to investigate the confinement effects on the photoalignment, photochemical phase transition, and thermochromic behavior of the azobenzene polymer. The study finds that when confine…
Grafted MCM-41 materials are ordered mesoporous adsorbents suitable for reversed-phase liquid chromatography applications (RP-HPLC): they possess high surface area, which is a great advantage to enhance the thermodynamic behavior of the classical stationary phase by increasing solute retention. Hence, MCM-41s allow th…
The formation of previously unknown hexagonal modifications of orthoferrites RFeO 3 (R = Eu−Lu) was observed on ZrO 2 (Y 2 O 3 ) (111) substrates at 900 °C. XRD and HREM studies reveal epitaxial growth of the hexagonal film. The structure of the hexagonal RFeO 3 was assigned to the ferroelectric space group P 6 3 cm .…