Stretching and folding of 2-nanometer hydrocarbon rods
2014 | Zeitschriftenartikel. Eine Publikation mit Affiliation zur Georg-August-Universität Göttingen.
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- Autor(en)
- Lüttschwager, Nils O. B. ; Suhm, Martin A.
- Zusammenfassung
- Linear alkanes CnH2n+2 in vacuum isolation are finite models for an infinite polyethylene chain. Using spontaneous Raman scattering in supersonic jet expansions for n = 13–21 in different spectral ranges, we determine the minimal chain length nh for the cohesion-driven folding of the preferred extended all-trans conformation into a hairpin structure. We treat fully stretched all-trans alkanes as molecular “nanorods” and derive Young's modulus E for the stretching of an isolated single-strand polyethylene fibre by extrapolating the longitudinal acoustic mode to infinite chain length. Two key quality parameters for accurate intra- and intermolecular force fields of hydrocarbons (nh = 18 ± 1, E = 305 ± 5 GPa) are thus derived with high accuracy from experimental spectroscopy.
- Erscheinungsdatum
- 2014
- Status
- published
- Herausgeber
- Royal Soc Chemistry
- Zeitschrift
- Soft Matter
- Organisation
- Institut für Physikalische Chemie
- ISSN
- 1744-6848
- eISSN
- 1744-6848
- Sprache
- Englisch