Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Nanoparticles, Nanocrystals and Composites I
CPP 4.7: Vortrag
Montag, 7. März 2016, 11:15–11:30, H41
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
The self-assembly of achiral 3,5-bis-(5-hexylcarbamoylpentyloxy)-benzoic acid decyl ester (BHPB-10) molecules in solution and on substrate was investigated as a function of solvent quality. Tubular structures nanotubes with diameters of ca. 30 nm were favoured in solvents having weak interactions with the molecules (cyclohexane) while in solvents with comparatively strong molecule-solvent interactions (cyclohexanone) 12 nm wide nanoribbons were formed. Both structures were several micrometers long. A switching from nanoribbons to nanotubes was observed during solvent vapour annealing in cyclohexane vapour. Nanotubes could be switched back into nanoribbons by destroying the hydrogen bonding between BHPB-10 molecules via exposure to cyclohexanone. Atomic force microscope (AFM) revealed that nanoribbons first switched to helical twisted nanosheets which were subsequently transformed into tubular structures. Thus, tuning the interactions between BHPB-10 with the quality of the solvent, we were able to form nanoribbons, which can turn into helical twisted nanosheets or nanotubes but also to reversible switch between nanoribbons and nanotubes.