Advanced Materials

Cover image for Advanced Materials

October 1995

Volume 7, Issue 10

Pages fmi–fmi, 823–882

  1. Masthead

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Articles
    7. Communications
    8. Research News
    9. Book Reviews
    1. Masthead (page fmi)

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071001

  2. Essay

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Articles
    7. Communications
    8. Research News
    9. Book Reviews
    1. The federation of materials societies (pages 823–825)

      Dr. Robert A. Laudise

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071002

      The interests of the materials community in the US are represented by the Federation of Materials Socieites (FMS), in umbrella organization that is particularly concerned with the exchane of information between the policy-making community and the materials community. The FMS's structure, aims, publications and activities, such as workshops and conferences, are briefly outlined and its technology policy recommendations described in more detail.

  3. Articles

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Articles
    7. Communications
    8. Research News
    9. Book Reviews
    1. Optically Polarized 129Xe in NMR Spectroscopy (pages 826–838)

      Prof. Tanja Pietraiß and Prof. Holly C. Gaede

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071003

      The usefulness of xenon as an NMR probe can be extended by using highly spinpolarized 129Xe. Techniques for its exploitation as a surface probe in NMR studies are discussed and examples given of maerials that have been investigated. These range from mesoscopic structures such as nanocrystals and porous silicon to high surface area polymers. The Figure shows a 129Xe NMR image of nested glass tubes (gaps between the tubes are dark)

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  4. Communications

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Articles
    7. Communications
    8. Research News
    9. Book Reviews
    1. Enhanced efficiency of polymer light emitting diodes utilizing oxadiazole polymers (pages 839–842)

      Dr. Siegfried Karg, Dr. Walter Rieß, Prof. Markus Schwoerer, Elke Buchwald, Martin Meier, Peter Pösch, Walter Rieß, Prof. Hans-Werner Schmidt, Dr. Peter Strohriegl and Markus Schwoerer

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071004

      New oxadiazole polymers for use in LEDs are reported that have high thermal stability and excellent film-forming properties. The characteristics of the polymers themselves and of heterolayer LEDs based on poly(phenylenevinylene) that incorporate the polymers as efficient elecron transport and injection layers are discussed. The stability, operating time and quantum efficiency are shown to be improved compared to monolayer devices.

    2. Metamorphic materials: Restructuring siliceous mesoporous materials (pages 842–846)

      Deepa Khushalani, Dr. Alex Kuperman, Prof. Geoffrey A. Ozin, Kaoru Tanaka, Dr. Neil Coombs, Dr. Michael M. Olken and Dr. Juan Garcés

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071005

      Effective tailoring of pore sizes in mesoporous molecular sieves (see Figure) has been achieved by a novel method involving the restructuring of the mesopores under mild aqueous conditions. A studyis reported aimed at elucidating the underlying chemistry. It is suggested that further investigation could provide insight into natural biomineral resorption and lead to materials with enhanced biocompatibility characteristics

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    3. Electroluminescence, photoluminescence and x-ray reflectivity studies of self-assembled ultra-thin films (pages 846–849)

      Haiping Hong, Prof. Dan Davidov, Haim Chayet, Prof. Yair Avny, Erez Z. Faraggi and Dr. Ronny Neumann

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071006

      High-qality self-assembled heterostructures for polymer LEDs have been fabricated from PPV and newly synthesized copolymers of PPV and naphthalene. It is shown that the layer-by-layer self-assembly of multilayer structures has advantages with respect to control of the thickness and homogeneity of the polymer films compared to the conventional spin coating technique. The fabrication and characterization of the heterostructures are detailed and features of the electroluminescence and photoluminescence discussed.

    4. Photo-crosslinking in freely-suspended films of ferroelectric lc-polymers (pages 849–852)

      Dr. Martin Brehmer, Prof. Rudolf Zentel, Dr. Jürgen Reibel and Prof. Gero Decher

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071007

      The combination of thin-film and ferroelectric-elastomeric properties—of interest for piezoelectric and nonlinear optical applications—is the aim in preparing freely-suspended (FS) films from polymeric liquid-crystal elastomers with SmC* phases. The preparation and characterization of such films from crosslinkable SmC* polymers is reported for the first time, together with their photo-crosslinking and an investigation of the stabilization effect of the crosslinking.

    5. Wavelength dependance in laser floating zone processing. A case study with bi-SR-CA-CU-O superconductors (pages 853–856)

      Dr. German F. de la Fuente, Dr. Juan Carlos Diez, Dr. Luis A. Angurel, Dr. JoséI. Peña, Dr. Andre Sotelo and Prof. Rafael Navarro

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071008

      Laser floating zone processing methods are particularly suitable for studying crystal growth and the development of texture from the melt in many materials used n electrooptics, for example. A system is descrbed that allows different laser wavelengths to be used, and first results on BSCCO superconducting fibers processed using different lasers are presented. The Figure compares textures produced using Nd:YAG and CO2 lasers

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  5. Articles

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Articles
    7. Communications
    8. Research News
    9. Book Reviews
    1. Self-assembled crystalline monolayers and multilayers of n-alkanes on the water surface (pages 857–862)

      Dr. Susan P. Weinbach, Dr. Isabelle Weissbuch, Prof. Meir Lahav, Prof. Leslie Leiserowitz, Dr. Kristian Kjaer, Dr. Wim G. Bouwman and Prof. Jens Als Nielsen

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071009

      The induced formation of multilayer crystallites at liquid interfaces provides a direct means of monitoring the dynamics of crystal nucleation and of elucidating the effect of molecular inhibitors on polymorphism and crystal growth. The spontaneous formation of crystalline multilayers of n-alkanes spread from solution onto the water interface are described and X-ray structural investigations discussed which indicate that the full crystal symmetry is present even in layers that are only a few unit cells thick.

  6. Communications

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Articles
    7. Communications
    8. Research News
    9. Book Reviews
    1. Change in the shape of copper nanoparticles in ordered phases (pages 862–864)

      Judith Tanori and Prof. Marie Paule Pileni

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071010

      The shape of copper metal particles (see Figure) is demonstrated to depend on the structure of the mesophase (cylindrical reverse micelles, interconnected networks of surface aggregates or lamellar phases) i the surfactant system used as a microreactor for their synthesis. An understanding of this correlation is of great importance for magnetic recording technology

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    2. Synthesis and characterization of micrometersized polypyrrole-coated polystyrene latexes (pages 864–866)

      Stuart F. Lascelles and Dr. Steven P. Armes

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071011

      Improvements in the processability of polypyrrole—a relatively air-stale organic conducting polymer—can be obtained by producing colloidal dispersions. The particles reported here are “inside out”, i.e., micrometer-sized, sterically stabilized polystyrene latex particles are coated wh an outer layer of polypyrrole. Their synthesis and physical properties are described and ideas for further work and potential novel applications, for example in immunodiagnostic assays, suggested.

    3. Liquid crystals based on 2-fluoropyrimidine and -pyridine: synthesis, dielectric anisotropy and phase behavior (pages 867–870)

      Dr. Matthias Bremer

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071012

      Polar liquid crystals with strongly positive dielectric anisotropies are of continuing interest to the display industry because they help to lower both the operating voltage and the total power consumption of LCDs in portable devices. Fluorinated heterocyclic materials (Figure, right, where MG is a mesogenic group) are shown here to exhibit improved mesophase properties and higher dielectric anisotropies than commonly used materials based on carbocyclic structures (Figure, left)

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  7. Research News

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Articles
    7. Communications
    8. Research News
    9. Book Reviews
    1. The preparation of novel silica gel hollow tubes (pages 871–872)

      Dr. Hidenori Nakamura and Dr. Yasushi Matsui

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071013

      Work-like silica gel hollow tubes have been prepared using a sol-gel method. The tubes (see Figure), wich are porous, mostly have one end closed, although occasionally tubes with both ends closed are produced. The preparation method, which involves the hdyrolysis of tetraethylorothosilicate in a mixture of ethanol, ammonia, water and citric acid monohydrate, is described

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    2. Ion beam induced charge microscopy for the analysis of integrated circuits (pages 873–875)

      Dr. Mark Breese

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071014

      Ion beam induced charge (IBIC) microscopy provides a means of imaging the depletion layers of working microelectronic devices beneath their thick metallizaion and passivation layers. The concept of IBIC microscopy is outline, its advantages over optical and electron microscopy techniques are outlined, its advantages over optical ad electron micorscopy techniques are described, and examples of images are presented. One particular application is as a way of identifying device components that are susceptible to having their logic state altered by cosmic rays when used in satellites, for example.

    3. Liquid crystalline oligomeric and polymeric phthalocyanines (pages 877–880)

      Prof. Michael J. Cook

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19950071015

      The many interesting properties of phthalocyanines (nonlinear optical behavior, redox properties, semiconductivity) have been extended to include liquid crystalline (LC) behavior since these compounds atracted the attention of syntehtic chemists. Approaches to the synthesis of polymeric LC phthalocyanines are described and their LC behavior briefly reviewed. Evidence is presented that the polymers develop columnar stacks that mimic those of simpler mesogens.

  8. Book Reviews

    1. Top of page
    2. Masthead
    3. Essay
    4. Articles
    5. Communications
    6. Articles
    7. Communications
    8. Research News
    9. Book Reviews

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