Advanced Materials

Cover image for Advanced Materials

September 1995

Volume 7, Issue 9

Pages fmi–fmi, 773–814

  1. Masthead

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Research News
    1. Masthead (page fmi)

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070901

  2. Essay

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Research News
    1. The materials research society (pages 773–774)

      Dr. Julia M. Phillips

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070902

      The 1995 president of the MRS describes recent progress for the Society including its affiliation with the 800 000-member strong Federation of Materials Societies and its activities on the World Wide Web.

  3. Articles

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Research News
    1. Precursor-derived Covalent Ceramics (pages 775–787)

      Dr. Joachim Bill and Prof. Fritz Aldinger

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070903

      The preparation of ceramic materials from preceramic compounds provides a means for the synthesis of new materials which cannot be obtained by conventional methods. An example is shown in the figure, which shows carbon-fiber-reinforced silicon carbide coated with silicon carbonitride prepared by dip-coating the substrate with a slurry made of polyhydridomethylsilazane and silicon powder. Progress and applicational examples are reviewed

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  4. Communications

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Research News
    1. “Inverted” polymer light-Emitting diodes on cylindrical metal substrates (pages 788–790)

      Ed Westerweele, Prof. Paul Smith and Prof. Alan J. Heeger

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070904

      A cylindrical polymer-based light-emitting diode is reported. An aluminum rod is used simultaneously as a substrate and as the electron-injecting electrode, and a soluble derivative of poly-p-phenylenevinylene, and polyaniline are used as the electroluminescent layer and the hole-injecting electrode respectively. The materials are dip-coated directly from solution simplifying the production process. It is thought that the optimization of the materials used in this novel structure will lead to performance enhancement.

    2. Preparation of a flexible polyaniline-pvc composite (pages 790–792)

      Dr. Costa Conn, Norman Booth and Prof. Joe Unsworth

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070905

      An inexpensive, highly conducting polymer-thermoplastic composite material is reported which is both flexible and possesse a low percolation threshold. The method used to prepare the PANI-PVC material “see Figure” allows control of the flexibility of the product through the use of commercially available plasticizers

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    3. Glass-encapsulated molecular wires: A polypyrrole/porous glass composite (pages 792–794)

      Daltamir J. Maia, Prof. Marco-A De Paoli, Aldo Jose G. Zarbin and Dr. Oswaldo L. Alves

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070906

      The production of molecularly isolaed polymers as molecular wires is a method of controlling the factors, such as microstructure, morphology, counter-ion, etc., which influence the properties of the material. Here, porous Vycor glass is used as the host material, Cu2⊕ ions which have been previously introduced into the 20–200 Å pores promoting the polymerization of pyrrole by reduction. The synthesis and properties of the new material are presented.

    4. Novel gold-dithiol nano-networks with non-metallic electronic properties (pages 795–797)

      Dr. Mathias Brust, Prof. David J. Schiffrin, Dr. Donald Bethell and Dr. Christopher J. Kiely

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070907

      Stable nanostructured networks of quantum-sized particles have been prepared “see Figure” using self-assembly techniques. Here, two new techniques are reported for the preparation of non-metallic composite materials comprising nanometersized gold particles self assembled into a 3-D network by means of organic dithiols

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    5. Luminescence and anti-aggregative properties of polyoxyethylene-substituted phthalocyanine complexes (pages 797–800)

      Prof. Jacques Simon and Dr. Joël Vacus

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070908

      A water-soluble phthalocyanine derivative with 16 poly-oxyethylene side chains which effectively prevent aggregation is reported. The first demonstration of luminescence in a water-soluble, non-ionic phthalocyanine in aqueous solution is discussed an important results from the development of effective manomeric dyes for use in phototherapy.

    6. Semi-interpenetrating polymer networks with temperature-dependent light transmission—a new smart material for solar technology (pages 800–803)

      Dr. Helen Rose Wilson, Prof. Hans-Joachim Cantow and Dr. Wolfgang Eck

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070909

      The protection of solar energy collecting technology against overheating can be achieved using the co-polymer reported here. In the form of a semi-interpenetrating polymer network, te co-polymer demixes when the temperature rises above a certain value “which can be tuned between 30 and 150°C by adjusting the ratio of the repeat units of the components”. In the phase-separated state the light transmission of the material is reduced significantly by backward light scattering.

    7. Liquid crystals based on 2- fluoropyrimidine and -pyridine: synthesis, dielectric anisotropy and phase behavior (pages 803–807)

      Dr. Matthias Bremer

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070910

      Polar liquid crystals with strongly positive dielectric anisotropies are of continuing interest to the display industry because theyhelp to lower both the operating voltage and the total power consumption of LCDs in portable devices. Fluorinated heterocyclic materials “Figure, right, MG = mesogenic group” are shown here to exhibit impoved mesophase properties and higher dielectric and optical anisotropies than commonly used materials used in the purely fluorine substituted moietie

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    8. On the electrochemical polymerization of acrylonitrile and n-vinylpyrrolidone: new insight into the mechanism (pages 807–809)

      Prof. Robert Jérǒme, Marc Mertens and Dr. Lucien Martinot

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070911

      The protection of metals against environmental attack can be achieved by coating the metal with a protective organic film. Poor adhesion of the organic film to the metal surface has, however, limited the success of this approach. Here it is demonstrated that polyacrylonitride can be elecrografted onto a nickel surface producing a strongly adherent film. The transformation of the organic film could also open the way to new polymer–metal composites.

  5. Research News

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Research News
    1. LEDs based on poly(p-phenylenevinylene) and polyimide LB films (pages 812–814)

      Aiping Wu and Dr. Masa-aki Kakimato

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950070912

      Highly ordered organic thin films with well defined film thicknesses produced using the Langmuir-Blodgett technique can employed in the fabrication of ultra-thin heterostructure devices. Heterostructure LEDs have been shown to exhibit superior performance characteristics. Recent progress is reviewed.

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