Die Glaskeramik ,,Zerodur" ist als ein Werkstoff mit extrem kleinem Warmeausdehnungskoeffizienten entwickelt worden. Die bekannten Materialeigenschaften werden hier durch Angaben uber langzeitige Langenanderungen erganzt. Wahrend einer Beobachtungszeit von 10 Jahren zeigen drei Proben des Materials, die verschiedene thermische Behandlungen erfahren hatten, unterschiedliche Verkurzungen, die sich durch mathematische Formeln (logarithmisch, hyperbolisch, exponentiell) fast gleich gut beschreiben lassen. Die relativen Langenanderungen pro Jahr liegen zwischen -0.69 . a-' und -0,03 . a-'.
We report an experimental study on photo-electrical response of new nanocomposites produced from discotic mesogen LTTH-6 (possessing columnar liquid-crystalline phase) and single-walled carbon nanotubes (SWCNTs) with diameter ∼ 1.5 nm. The SWCNTs were incorporated in LTTH-6 at concentration of 1 wt.%. Thin layers of SWCNTs/LTTH-6 nanocomposites were formed with a thickness of 3 μm. The light-induced change in electrical conductivity of these layers was ascertained at room temperature by current-voltage measurements, upon illumination with a low-intensity (∼ 1 mW/cm2) continuous visible light. The effect of photoresponsivity of the glassy-like columnar phase of SWCNTs/LTTH-6 manifests the potential of such nanocomposites to be functional materials for applications in molecular electronics, sensorics and mechatronics.
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