Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: P9: Crystallization, Nucleation and Self Assembly
CPP 44.8: Poster
Mittwoch, 18. März 2015, 10:00–13:00, Poster A
Reversible switching between self-assembled nanoribbons and nanotubes — •Asad Jamal1,2, Philippe Mesini3, and Günter Reiter1,2 — 1Physikalisches Institut und — 2Freiburger Materialforschungszentrum, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg, Germany — 3Institut Charles Sadron, 23 rue du Loess BP 84047, 67034 Strasbourg Cedex 2, France
Depending on the quality of the solvent, achiral 3,5-bis(5-hexylcarbamoyl-pentyloxy)-benzoic acid decyl ester (BHPB-10) molecules were self-assembles into nanotubes of about 10 nanometer in width and nanoribbons with a diameter of ca. 40 nanometer, both having several micrometers in length. In solvents weakly interacting with BHPB-10 like cyclohexane nanotubes were formed while in solvents with comparatively strong molecule-solvent interactions like cyclohexanone nanoribbons were created. Interestingly, annealing nanoribbons in the vapor of cyclohexane allowed to switch them to nanotubes. Moreover, changing the solvent from cyclohexane to cyclohexanone switched nanotubes back into nanoribbons. Atomic force microscopy studies indicated that nanoribbons transited through helical twisted nanosheets into tubular structures. We relate the nanotube formation to hydrogen-bonds among the BHPB-10 molecules which are not possible in cyclohexanone.