<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Characterization and application of ion track-etched nanopores"^^ . "This thesis investigates the ionic transport properties of single, conical nanopores in polymers, as well as their applicability as single-molecule sensors. The pores were produced by selective etching of the damaged zones of energetic heavy ions (track-etching technique). More basic investigations of the shape of track-etched pores (by small-angle X-ray scattering, electron microscopy and conductometry) are also included, revealing smaller pore sizes on top of a membrane than inside the pore. Conical track-etched nanopores are cation selective and show asymmetric I-V characteristics, depending on pH value and concentration of the electrolyte. These properties result from their negative surface charges created during the etching process, which lead to an intrinsic asymmetric electric potential long the pore axis. Experiments show a maximum for the rectification at about 0.1 M KCl, in accordance with theoretical calculations. The selectivity of the pores depends on the direction of an applied concentration gradient, being higher for the lower concentration facing the small opening of the pore, again in agreement with calculations. The pores transport properties are strongly influenced by small concentrations of divalent cations. Conical polyimide pores have been found suitable to detect single DNA molecules passing through them via changes in the ionic current."^^ . "2007" . . . . . . . . "Birgitta"^^ . "Schiedt"^^ . "Birgitta Schiedt"^^ . . . . . . "Characterization and application of ion track-etched nanopores (PDF)"^^ . . . "Diss_BSchiedt.pdf"^^ . . . "Characterization and application of ion track-etched nanopores (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Characterization and application of ion track-etched nanopores (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Characterization and application of ion track-etched nanopores (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Characterization and application of ion track-etched nanopores (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Characterization and application of ion track-etched nanopores (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #7426 \n\nCharacterization and application of ion track-etched nanopores\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .