Interactive forces between sodium dodecyl sulfate-suspended single-walled carbon nanotubes and agarose gels.

摘要: Selective adsorption onto agarose gels has become a powerful method to separate single-walled carbon nanotubes (SWCNTs). A better understanding of the nature interactive forces and specific sites responsible for should lead significant improvements in selectivity yield these separations. combination nonequilibrium equilibrium studies are conducted explore potential role that van der Waals, ionic, hydrophobic, π-π, ion-dipole interactions have on selective between SWCNTs suspended with sodium dodecyl sulfate (SDS). The results demonstrate any modification gel surface and, consequently, permanent dipole moments drastically reduces retention SWCNTs. Because dipoles critical fact SDS-SWCNTs function as macro-ions, it is proposed primary interaction adsorption. may be attributed variations polarizability nanotube types, which create differences both structure mobility surfactant. These affect enthalpy entropy adsorption, play an integral part overall process shows complex behavior not well represented by Langmuir model; therefore, calorimetric data used extract thermodynamic information.