Determination of the surfactant density on SWCNTs by analytical ultracentrifugation

Journal article
(Original article)

Publication Details

Author(s): Backes C, Karabudak E, Schmidt C, Hauke F, Hirsch A, Wohlleben W
Journal: Chemistry - A European Journal
Publisher: Wiley-VCH Verlag
Publication year: 2010
Volume: 16
Journal issue: 44
Pages range: 13176-13184
ISSN: 0947-6539
Language: English


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.

FAU Authors / FAU Editors

Backes, Claudia Dr. rer. nat.
Exzellenz-Cluster Engineering of Advanced Materials
Hauke, Frank Dr.
Zentralinstitut für Neue Materialien und Prozesstechnik
Hirsch, Andreas Prof. Dr.
Lehrstuhl für Organische Chemie II

Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials

External institutions with authors

University of Twente

Research Fields

B Nanoelectronic Materials
Exzellenz-Cluster Engineering of Advanced Materials
C Photonic and Optical Materials
Exzellenz-Cluster Engineering of Advanced Materials

How to cite

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.

Backes, Claudia, et al. "Determination of the surfactant density on SWCNTs by analytical ultracentrifugation." Chemistry - A European Journal 16.44 (2010): 13176-13184.


Last updated on 2019-14-04 at 21:50