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The effect of the degree of deacetylation of chitosan on its dispersion of carbon nanotubes |
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| Authors: | Chularat Iamsamai Uracha Ruktanonchai Stephan T Dubas |
| Affiliation: | a Nanoscience and Technology Program, Graduate School, Chulalongkorn University, Bangkok 10330, Thailand b Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand c National Nanotechnology Center, National Science and Technology Development Agency, Pathumthani 12120, Thailand d Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand e Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, Thailand |
| Abstract: | The effect of the degree of deacetylation (DD) of chitosan biopolymer on the noncovalent surface modification of multiwall carbon nanotubes (MWCNTs) is presented. MWCNTs were modified by chitosan having different degree of deacetylation (61%, 71%, 78%, 84%, 90% and 93%) and UV-Visible spectroscopy was used to evaluate their dispersion efficiency as a function of chitosan concentration and degree of deacetylation. Results showed that the dispersion of MWCNTs could be dramatically improved when using chitosan with the lowest degree of deacetylation (61%DD) possibly due to a higher surface coverage of the MWCNTs. Zeta potential measurements were used to confirm that the chitosan surface coverage on the MWCNTs was twice as high when modifying the nanotubes surface with the 61%DD than when using the 93%DD chitosan. These results suggest that the dispersion of MWCNTs with chitosan can be improved when using chitosan having a degree of deacetylation of 61%. These results are of interest in particular for the improved dispersion of MWCNTs in aqueous solutions such as in drug delivery applications. |
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