RT Journal Article
T1 Potentiometric Study of Carbon Nanotube/Surfactant Interactions by Ion-Selective Electrodes. Driving Forces in the Adsorption and Dispersion Processes
A1 Ostos, Francisco José
A1 Lebrón, José Antonio
A1 Maestre, A.
A1 López López, Manuel
AB The interaction (adsorption process) of commercial ionic surfactants with non-functionalizedand functionalized carbon nanotubes (CNTs) has been studied by potentiometric measurementsbased on the use of ion-selective electrodes. The goal of this work was to investigate the role ofthe CNTs’ charge and structure in the CNT/surfactant interactions. Non-functionalized single-(SWCNT) and multi-walled carbon nanotubes (MWCNT), and amine functionalized SWCNT wereused. The influence of the surfactant architecture on the CNT/surfactant interactions was alsostudied. Surfactants with different charge and hydrophobic tail length (sodium dodecyl sulfate(SDS), octyltrimethyl ammonium bromide (OTAB), dodecyltrimethyl ammonium bromide (DoTAB)and hexadecyltrimethyl ammonium bromide (CTAB)) were studied. According to the results, theadsorption process shows a cooperative character, with the hydrophobic interaction contributionplaying a key role. This is made evident by the correlation between the free surfactant concentration(at a fixed [CNT]) and the critical micellar concentration, cmc, found for all the CNTs and surfactantsinvestigated. The electrostatic interactions mainly determine the CNT dispersion, althoughhydrophobic interactions also contribute to this process.
PB MDPI
SN 1422-0067
YR 2021
FD 2021-01
LK http://hdl.handle.net/10272/19482
UL http://hdl.handle.net/10272/19482
LA eng
NO Ostos, F. J., Lebrón, J. A., Maestre, Á. ... López López, M. (2021). Potentiometric Study of Carbon Nanotube/Surfactant Interactions by Ion-Selective Electrodes. Driving Forces in the Adsorption and Dispersion Processes. International Journal of Molecular Sciences, 22(2), 826. DOI: https://doi.org/10.3390/ijms22020826
DS Repositorio Institucional de la Universidad de Huelva
RD 1 jun 2026