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Structural Characterization of Supramolecular Hollow Nanotubes with Atomistic Simulations and SAXS

preprint
submitted on 27.08.2020 and posted on 27.08.2020 by Ilias Patmanidis, Alex H. de Vries, Tsjerk A. Wassenaar, Wenjun Wang, Giuseppe Portale, Siewert-Jan Marrink
Self-assembled nanostructures arise when building blocks spontaneously organize into ordered aggregates that exhibit different properties compared to the disorganized monomers. Here, we study an amphiphilic cyanine dye (C8S3) that is known to self-assemble into doublewalled, hollow, nanotubes with interesting optical properties. The molecular packing of the dyes inside the nanotubes, however, remains elusive. To reveal the structural features of the C8S3 nanotubes, we performed atomistic Molecular Dynamics simulations of preformed bilayers and nanotubes. We find that different packing arrangements lead to stable structures, in which the tails of the C8S3 molecules are interdigitated. Our results are verified by SAXS experiments. Together our data provide a detailed structural characterization of the C8S3 nanotubes. Furthermore, our approach was able to resolve the ambiguity inherent from cryo-TEM measurements in calculating the wall thickness of similar systems. The insights obtained are expected to be generally useful for understanding and designing other supramolecular assemblies.

History

Email Address of Submitting Author

i.patmanidis@rug.nl

Institution

University of Groningen

Country

Netherlands

ORCID For Submitting Author

0000-0002-5245-5897

Declaration of Conflict of Interest

No conflict of interest

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