title: Adsorption of sodium dodecylsulfate on single-walled carbon nanotubes characterised using small-angle neutron scattering.
abstract: Aqueous dispersions of single-walled carbon nanotubes are often made using sodium dodecylsulfate (SDS), which adsorbs to the nanotube surface to stabilise them. Despite SDS being commonly used with single-walled carbon nanotubes, there is no consensus on the structure of the adsorbed layer. Small-angle neutron and X-ray scattering results reported here show that the data can be fitted to a relatively simple core-shell cylinder model, consistent with a polydisperse nanotube core of radius 10Å, surrounded by an adsorbed surfactant layer of thickness 18Å and volume fraction of 0.5. This is consistent with small nanotube bundles surrounded by an adsorbed layer of extended SDS molecules.
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: E S
authors.initials: ES
authors.lastname: Kastrisianaki-Guyton
authors.affiliation: Merck Chemicals Ltd., Chilworth Technical Centre, University Parkway, Southampton SO16 7QD, UK.
authors.forename: L
authors.initials: L
authors.lastname: Chen
authors.affiliation: ISIS Neutron Source, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK.
authors.forename: S E
authors.initials: SE
authors.lastname: Rogers
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: T
authors.initials: T
authors.lastname: Cosgrove
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK. Electronic address: j.s.van-duijneveldt@bristol.ac.uk.
authors.forename: J S
authors.initials: JS
authors.lastname: van Duijneveldt
keywords: Adsorption; SANS; SDS; SWCNTs; Single-walled carbon nanotubes; Small-angle neutron scattering; Sodium dodecylsulfate