Viscoelasticity of Single-Walled Carbon Nanotube Solutions with Tunable Attractive Interactions
Young, Colin Christopher
Master of Science
Understanding the microstructure of single walled nanotubes (SWNTs) in solution is an essential step in the development of fluid processing techniques for the creation of multifunctional macroscopic SWNT materials and is also useful in the more fundamental study of rigid rod solutions. In this thesis, the microstructure of SWNT solutions in ClHSO 3 and in mixtures of ClHSO 3 and 102% H 2 SO 4 is studied by investigation of their viscoelastic properties. These results are compared to previous investigations of SWNTs in 102% H 2 SO 4 and in ClHSO 3 at higher concentrations in order to study the effects of concentration and inter-SWNT attractive potential. Attractive interactions between the SWNTs are found to have a strong effect on percolation threshold concentration. A percolation transition is also observed in solutions at a fixed concentration as the solvent strength is decreased. Measurements obtained below the percolation transition are compared to the predictions of existing rigid rod solution models.
Applied sciences; Nanoscience; Materials science