Determination of the surfactant density on SWCNTs by analytical ultracentrifugation
Backes C, Karabudak E, Schmidt C, Hauke F, Hirsch A, Wohlleben W (2010)
Publication Language: English
Publication Type: Journal article, Original article
Publication year: 2010
Journal
Original Authors: Backes C., Karabudak E., Schmidt C.D., Hauke F., Hirsch A., Wohlleben W.
Publisher: Wiley-VCH Verlag
Book Volume: 16
Pages Range: 13176-13184
Journal Issue: 44
Abstract
We report on the extensive characterization of single-walled carbon nanotubes (SWCNTs) dispersed in a variety of surfactants, such as sodium dodecyl benzene sulfonate (SDBS), sodium cholate (SC), and three synthesized perylene-based surfactants, by using differential sedimentation in H O and D O. Multidimensional evaluation of the absorption profiles over radius, wavelength, and time allows the determination of the anhydrous specific volumes of the SWCNT-surfactant complexes as well as the concentration of the surfactant reservoir in free micelles with very slow sedimentation coefficients (<1 Svedberg). Among the perylene bisimide surfactants, the smallest derivative is densely adsorbed on the nanotube backbone with an anhydrous specific volume significantly above that of SC or SDBS. Bulky Newkome dendritic groups on one or both ends of the perylene moiety gradually reduce the adsorption density, in accord with the absolute adsorption between 0.66 and 1.7 mmol surfactant per gram SWCNTs. Furthermore, hydrodynamic analysis reveals that SDBS favors the "tails-on" configuration. The distribution of sedimentation coefficients of SWCNTs prepared by high-pressure carbon monoxide decomposition (HiPco) is broader and shifted to faster sedimentation than those prepared by using cobalt-molybdenum catalysis (CoMoCAT), which reflects the polydispersity in diameter and length. Nanotube detergents: Deep insights into the arrangement of various surfactants noncovalently bound to the sidewall of single-walled carbon nanotubes (SWCNTs, see figure) have been obtained by analysis of the sedimentation coefficients with analytical ultracentrifugation. The investigation included classical detergents, as well as synthesized perylene-based surfactants. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Authors with CRIS profile
Claudia Backes
Exzellenz-Cluster Engineering of Advanced Materials (EAM)
Frank Hauke
Zentralinstitut für Neue Materialien und Prozesstechnik
Andreas Hirsch
Lehrstuhl für Organische Chemie II
Additional Organisation(s)
Involved external institutions
Netherlands (NL)
Germany (DE)How to cite
APA:
Backes, C., Karabudak, E., Schmidt, C., Hauke, F., Hirsch, A., & Wohlleben, W. (2010). Determination of the surfactant density on SWCNTs by analytical ultracentrifugation. Chemistry - A European Journal, 16(44), 13176-13184. https://doi.org/10.1002/chem.200903461
MLA:
Backes, Claudia, et al. "Determination of the surfactant density on SWCNTs by analytical ultracentrifugation." Chemistry - A European Journal 16.44 (2010): 13176-13184.
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