Advanced Materials

Cover image for Advanced Materials

September 1991

Volume 3, Issue 9

Pages fmi–fmi, 416–459

  1. Masthead

    1. Top of page
    2. Masthead
    3. Articles
    4. Optical Storage Pattern Recognition Genetic Engineering Holography
    5. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling
    6. Materials Forum
    7. Communications
    8. Talking Point
    9. Talking Points
    10. Research News
    1. Masthead (page fmi)

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030901

  2. Articles

    1. Top of page
    2. Masthead
    3. Articles
    4. Optical Storage Pattern Recognition Genetic Engineering Holography
    5. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling
    6. Materials Forum
    7. Communications
    8. Talking Point
    9. Talking Points
    10. Research News
    1. New European funding for advanced materials research: Call for proposals in ESPRIT (pages 416–419)

      Dr. Ingo Hussla and Natasha Us

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030902

      Essay: The ESPRIT programme of the European Community has recently issued a call for proposals for the next round of funding for which over 5 billion ECU have been earmarked. Some of the research which has received support from the Programme in the past is described and the conditions for application for the next round (which closes on October, 14, 1991) are presented.

  3. Optical Storage Pattern Recognition Genetic Engineering Holography

    1. Top of page
    2. Masthead
    3. Articles
    4. Optical Storage Pattern Recognition Genetic Engineering Holography
    5. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling
    6. Materials Forum
    7. Communications
    8. Talking Point
    9. Talking Points
    10. Research News
    1. Optical Applications of Bacteriorhodopsin and its mutated variants (pages 420–428)

      Prof. Christoph Bräuchle, Dr. Norbert Hampp and Prof. Dieter Oesterhelt

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030903

      Review: Biological systems can be engineered to perform optical data storage. These natural materials, for example bacteriorhodopsin, a protein from the photosynthetic system of a bacteria which lives in exteme environments, can also be employed in pattern recognition (see Figure) where a 25 letter pattern is compared with the letter “P”. The position of the letter “P” in the grid is correctly identified but the letters “B” and “R” are also marked as containing the elements of the letter “P”. This ability to recognize similarity could have important applications in data processing.

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  4. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling

    1. Top of page
    2. Masthead
    3. Articles
    4. Optical Storage Pattern Recognition Genetic Engineering Holography
    5. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling
    6. Materials Forum
    7. Communications
    8. Talking Point
    9. Talking Points
    10. Research News
    1. Chemical interactions in GaAs-LEC crystal growth (pages 429–435)

      Dr. Ulrich Lambert and Dr. Ulrich Wiese

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030904

      Review: Light-emitting diodes, high-speed transistors, laser diodes, and solar cells are just a few of the applications of gallium arsenide (GaAs), for which the availability of ultrapure materials or materials with closely controlled impurity profiles is of utmost importance. The development and optimization of one major method of GaAs crystal growth is described with special emphasis on the possibilities of controlling the conductivity characteristics of the material.

  5. Materials Forum

    1. Top of page
    2. Masthead
    3. Articles
    4. Optical Storage Pattern Recognition Genetic Engineering Holography
    5. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling
    6. Materials Forum
    7. Communications
    8. Talking Point
    9. Talking Points
    10. Research News
    1. Materials Forum (pages 435–460)

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030905

  6. Communications

    1. Top of page
    2. Masthead
    3. Articles
    4. Optical Storage Pattern Recognition Genetic Engineering Holography
    5. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling
    6. Materials Forum
    7. Communications
    8. Talking Point
    9. Talking Points
    10. Research News
    1. The detection of halogenated hydrocarbons via host–guest chemistry—a mass-sensitive sensor study with QMB- and SAW-devices (pages 436–438)

      Prof. Franz L. Dickert and Petra A. Bauer

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030906

      Communication: Ring-like structures composed of different numbers of glucose molecules, the cyclodextrins, in which the central cavity (see Figure) can be varied in diameter from 4.7–8.5 Å have been shown to act as specific host materials for a number of halogenated hydrocarbons. The effect, and potential applications as solvent sensors based on quartz-microbalence- and surface-accoustic-wave oscillator devices are discussed.

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    2. Electron/proton transfer reactions and superconductivity: The role of hydrogen in lanthanum copper oxide (pages 438–440)

      Peter Rudolf, Dr. Werner Paulus and Prof. Robert Schölhorn

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030907

      Communication: Is lanthanum copper oxide really lanthanum copper oxide? Evidence is presented showing that the conventionally prepared semiconductor La2CuO4, which has been the starting material in many studies of the high-Tc superconducting copper oxides, is in fact a nonstoichiometric oxide hydroxide (La1.95CuO3.86(OH)0.14). It is also shown that the conversion of the semiconducting phase to the superconducting phase by anodic oxidation does not proceed via the insertion of oxygen into the La2CuO4 but rather over an electron/proton transfer process.

    3. High molecular weight poly([ 1.1.1]propellane)s and a new polyamide with bicyclo[1.1.1]pentane fragments (pages 440–442)

      Harald Bothe and Dr. Arnulf-Dieter Schlüter

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030908

      Communication: A polyamide, where the amide functions are connected via rigid, non-aromatic units, which forms liquid-crystalline phases in concentrated sulfuric acid and is thus suitable for the preparation of fibers is reported. The synthesis has been made possible by a breakthrough in the ability to produce high molecular weight poly([1.1.1]-propellane)s (see Figure).

    4. TiFeCr/NaM—a new hydrogen-storage material (pages 442–445)

      Prof. Wenyang Xu, Dr. Jinping Li and Dr. Jinxiang Dong

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030909

      Communication: A composite which combines the hydrogen-storage capabilities of TiFeCr alloys with the selective absorption characteristics of mordenite zeolites (NaM) is reported. The new material even exhibits a higher hydrogen-storage capacity than the parent alloy and therefore could be of considerable technological interest.

    5. Orientation of monolayers by convection (pages 445–447)

      Dr. Christof Kurthen and Prof. Walter Nitsch

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030910

      Communication: Stationary channel flow is shown to generate molecular orientation in a stagnant monolayer perpendicular to that caused by the flow orientation of molecules in solution. The use of a stagnation barrier (see Figure) in a channel flow setup enables the control of the large-scale in-plane orientation of dye molecules mixed with rod-like polymers. The orientation is maintained during Langmuir–Blodgett film transfer.

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  7. Talking Point

    1. Top of page
    2. Masthead
    3. Articles
    4. Optical Storage Pattern Recognition Genetic Engineering Holography
    5. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling
    6. Materials Forum
    7. Communications
    8. Talking Point
    9. Talking Points
    10. Research News
    1. “Biomimetic” materials: A potential distortion of materials policies (pages 448–451)

      Prof. Rustum Roy

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030911

      Talking Point: As funding for research becomes ever harder to come by, scientists are increasingly forced to emphasize the importance of their work in terms of potential applications. As a result the question has arisen as to whether some researchers are “overselling” their work. In recent articles in Nature and elsewhere this question has caused a heated debate. In this and the following article two viewpoints in this controversy are presented.

  8. Talking Points

    1. Top of page
    2. Masthead
    3. Articles
    4. Optical Storage Pattern Recognition Genetic Engineering Holography
    5. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling
    6. Materials Forum
    7. Communications
    8. Talking Point
    9. Talking Points
    10. Research News
    1. Of Mimesis and Men (pages 451–452)

      John Maddox

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030912

      Talking Point: Some of the criticisms levelled at the Journal Nature in the preceeding article of the issue are addressed by its Editor, and ethical reporting and portrayal of research advances discussed. Comments from readers, in the form of “Letters to the Editor” would be most welcome.

  9. Research News

    1. Top of page
    2. Masthead
    3. Articles
    4. Optical Storage Pattern Recognition Genetic Engineering Holography
    5. Doping Profile Conductivity Control Multicomponent Systems Crystal Pulling
    6. Materials Forum
    7. Communications
    8. Talking Point
    9. Talking Points
    10. Research News
    1. Dye-doped polymer films: From supramolecular photochemistry to the molecular computer (pages 453–456)

      Prof. Urs P. Wild, Dr. Alexander Rebane and Dr. Alois Renn

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030913

      Research News: Hole burning in the spectra of dye-doped polymer films provides the opportunity for high density data storage, holographic image storage and even five-dimensional image storage is feasible (three spatial dimensions, frequency, and electric field). The background of the technique and recent progress in the optical data storage with lasers where impressive resolution and grey scales have been achieved (see Figure) is discussed.

    2. Template synthesis of polymeric and metal microtubules (pages 457–459)

      Prof. Charles R. Martin

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030914

      Research News: The pores in a microporous membrane can act as templates for the synthesis of polymeric and metallic microtubules. The tubules thus produced (see Figure) have monodispersed diameters and lengths and potential applications ranging from drug-delivery systems to microwave components and in electronic and opto-electronic devices.

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