Advanced Materials

Cover image for Advanced Materials

June 1991

Volume 3, Issue 6

Pages fmi–fmi, 279–323

  1. Masthead

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Materials Forum
    6. Articles
    7. Communications
    8. Research News
    9. Conference Report
    1. Masthead (page fmi)

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030601

  2. Essay

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Materials Forum
    6. Articles
    7. Communications
    8. Research News
    9. Conference Report
    1. The Leeds/Bradford/Durham IRC in Polymer Science & Technology (pages 279–281)

      Prof. Ian M. Ward

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030602

      Essay: The structure and support of Interdisciplinary Research Centres (IRCs) is still the subject of debate in the UK. One point of view is that significant progress will be made through focusing efforts in particular areas of science and technology. On the other hand, some believe that concentrating available funding in restricted fields will be detrimental to research outside the centres. The Director of the IRC for Polymer Science and Technology, which was officially opened in October 1990, describes the new centre and discusses the pros and cons.

  3. Articles

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Materials Forum
    6. Articles
    7. Communications
    8. Research News
    9. Conference Report
    1. Ladder Polymers: The new generation (pages 282–291)

      Dr. Arnulf-Dieter Schlüter

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030603

      Review: Polymers with high thermal, mechanical, and chemical stability based on a ladder-type structure (see figure), have suffered in the past from insolubility or infusibility. A new strategy for the controlled synthesis of processible ladder polymers, based on Diels-Alder polymerization is reviewed, and the polymers considered as precursors to graphite ribbons, materials predicted to have properties lying between graphite and single-stranded polyacetylene.

      • equation image
  4. Materials Forum

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Materials Forum
    6. Articles
    7. Communications
    8. Research News
    9. Conference Report
    1. Materials Forum (pages 291–324)

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030604

  5. Articles

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Materials Forum
    6. Articles
    7. Communications
    8. Research News
    9. Conference Report
    1. Defect chemistry of the high-Tc superconductors (pages 292–297)

      Prof. Joachim Maier and Gösta Pfundtner

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030605

      Review: The defect concentration and mobility in high-Tc superconductors to a large extent determine the conductivity. Defect modeling allows the defect concentration to be analyzed as a function of temperature, oxygen partial pressure and dopant concentration and through this, information useful in the optimization of thermodynamic and kinetic preparation and processing parameters can be obtained. A new defect model, applied to La2CuO4, YBa2Cu3O6–7, Nd2CuO4 and other HTSCs is reviewed.

    2. Thermal stability of Langmuir-Blodgett and self-assembled films: A possible scenario for order–disorder transitions (pages 298–303)

      Dr. Abraham Ulman

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030606

      Review: The effective design of stable, ordered organic superlattices is assisted by a thorough understanding of enthalpy and entropy contributions and molecular interactions in two dimensions. Important information in this respect can be obtained by studying the thermal stability of monolayers of long-chain organic amphiphiles. Work on both LB and SA films is reviewed and a possible explanation for thermally-induced structural events (e.g. order–disorder transitions, see figure) in molecular assemblies discussed.

  6. Communications

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Materials Forum
    6. Articles
    7. Communications
    8. Research News
    9. Conference Report
    1. On an (Un-)known compound in the Ca[BOND]Sr[BOND]Bi[BOND]Cu[BOND]O System (pages 304–306)

      Dr. Bernhard Hettich, Dr. Harro Bestgen and Dr. Joachim Bock

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030607

      Communication: The synthesis of phase-pure HTSC materials with well-defined superconductivity properties is facilitated by a sound knowledge of the equilibria between the various compounds present in the system. An in-depth study of the Ca[BOND]Sr[BOND]Bi[BOND]Cu[BOND]O system has revealed new relationships between the structures of the superconducting phases and sheds light on the complex mechanism which is operational during the formation of superconducting materials.

    2. Mixed semiconductor component quantum supralattices: Silver, sodium chloro, iodo-sodalites (pages 306–309)

      Andreas Stein, Michele Meszaros, Prof. Peter M. Macdonald, Prof. Geoffrey A. Ozin and Prof. Galen D. Stucky

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030608

      Communication: Resonant tunneling quantum dot transistors or high-gain heterojunction multiple quantum dot laser arrays are two potential applications of the title compounds. The new materials are composed of periodic arrays of all-space filling β-cages containing atomically precise, organized assemblies of single-size and shape M4X clusters, (see figure).

      • equation image
    3. Decamethylmanganocenium tetracyanoethenide, [Mn(C5Me5)2]⊙⊙⊕ [TCNE]⊙⊖—a molecular ferromagnet with an 8.8 K Tc (pages 309–311)

      Dr. Joel S. Miller, Dr. David A. Dixon, R. Scott. McLean, David M. Groski, Dr. Richard B. Flippen, Dr. Juan M. Manriquez, Dr. Gordon T. Yee, K. S. Narayan and Prof. Arthur J. Epstein

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030609

      Communication: Triplet electron-transfer salts are predicted to exhibit bulk ferromagnetic behavior at higher temperatures than their singlet analogues. To test this expected trend, the title compound, which is isostructural with [FeCpmath image]⊙⊕ [TCNE]⊙⊖ (Cp* = pentamethylcyloopentadienide; TCNE = tetracyanoethylene) which exhibits a Curie temperature, Tc, of 4.8 K has been synthesized. The synthesis and magnetic characterization of the new compound, which is found to have aTc of 8.8 K, are reported.

    4. A guidance for stable metallic conductivity in copper salts of N,N-dicyanobenzoquinonediimines (DCNQIs) (pages 311–315)

      Dr. Peter Erk, Hubert Meixner, Tobias Metzenthin, Prof. Siegfried Hünig, Uwe Langohr, Dr. Jost U. von Schütz, Dr. Hans-Peter Werner, Prof. Hans C. Wolf, Rainer Burkert, Dr. Hans W. Helberg and Gerhard Schaumburg

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030610

      Communiction: Radical anion salts of 2,5-substituted N,N'-dicyanoquinonediimines (DCNQIs) with various counterions represent a new class of highly conducting organic materials. Among the copper salts of the DCNQIs (see figure) five new radical anion salts with stable metallic behavior are presented. A comparison of structural details with physical properties reveals their stable metallic state to be conserved by tight crystal packing, which is dependent on the size of the substituents on the DCNQIs.

  7. Research News

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Materials Forum
    6. Articles
    7. Communications
    8. Research News
    9. Conference Report
    1. Controlled synthesis of inorganic materials using supramolecular assemblies (pages 316–318)

      Prof. Stephen Mann and Fiona C. Meldrum

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030611

      Research News: Protein cages acting as constrained reaction environments have recently been used to synthesize inorganic materials of nanometer dimensions. The size of the cavity within the protein and the level of loading with metal ions determine the final dimensions of the materials, and therefore site-specific modification of the inner surface of the protein could fine-tune the supramolecular assembly for tailored inorganic materials synthesis. Some of the latest developments are discussed.

    2. Surface resistance of thick film YBa2Cu3OX (pages 318–320)

      Dr. Neil McN. Alford and Dr. Tim W. Button

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030612

      Research News: Radio-frequency and microwave applications of high-Tc superconductors (HTSC), for example delay lines (see figure) require films exhibiting a low surface resistance. A method has recently been developed for processing thick films of HTSC which results in a higher critical current density and lower surface resistance than previously achieved.

    3. Biomaterials highlights IX. Bioactive ceramics (pages 320–322)

      Prof. Günther Heimke

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030613

      Research News/Biomaterials Highlights IX: Materials with active bone-bonding ability have found applications in medicine for coatings of, for example, load-bearing dental or orthopedic implants. These bioactive materials, which are based on calcium-phosphate-containing glasses of glass ceramics or Caphosphate-ceramics, have the problem however that they do not perform well under shear loading. The various materials employed and the factors which affect their performance are discussed.

  8. Conference Report

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Materials Forum
    6. Articles
    7. Communications
    8. Research News
    9. Conference Report
    1. Materials physics in Münster (page 323)

      Dr. Peter Gregory

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030614

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