Adsorption of sodium dodecylsulfate on single-walled carbon nanotubes characterised using small-angle neutron scattering

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• 作者：E.S. Kastrisianaki-Guyton^a ; L. Chen^b ; S.E. Rogers^c ; T. Cosgrove^a ; J.S. van Duijneveldt^a ; ^{j.s.van-duijneveldt@bristol.ac.uk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Small-angle neutron scattering ; SANS ; Single-walled carbon nanotubes ; SWCNTs ; Adsorption ; Sodium dodecylsulfate ; SDS
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 June 2016
• 年：2016
• 卷：472
• 期：Complete
• 页码：1-7
• 全文大小：641 K

文摘

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 10 Å, surrounded by an adsorbed surfactant layer of thickness 18 Å and volume fraction of 0.5. This is consistent with small nanotube bundles surrounded by an adsorbed layer of extended SDS molecules.