Multiwalled Carbon Nanotubes Modified with Biocompatible Compounds

Authors

  • Y. N. Bolbukh Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
  • G. S. Gunko Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
  • G. P. Prikhod’ko Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
  • V. A. Tertykh Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
  • K. László Budapest University of Technology and Economics
  • A. Tóth Budapest University of Technology and Economics
  • B. Koczka Budapest University of Technology and Economics

Abstract

Oxidized with solution of hydrogen peroxide multiwalled carbon nanotubes (MWCNTs) were modified with 2-hydroxyethylmethacrylate (HEMA) or chitosan (CTS). Morphology and surface properties of the pristine and modified MWCNTs have been investigated. The zeta-potential behaviour of MWCNTs was studied as a function of pH and suspension concentration. After oxidation, the divided nanotubes are found to have uncapped ports decorated with hydroxyl groups mostly. Surface oxygen-containing groups specify the negative zeta-potential in all pH range studied (pH=3-11). The values of zeta-potential display an inverse dependence on the dispersion concentration in acidic and basic solutions. After modification of oxidized MWCNTs with HEMA their isoelectric point is shifted from pH=2 to pH=10. Repeated surface treatment with HEMA (MWCNTs-HEMA-HEMA), along with change of the nature of terminal groups, provides stable surface charge increasing with nanotubes concentration in the pH range of 3-9. The isoelectric point of MWCNTs modified with CTS occurs at pH=4.5. At relatively small zeta-potential values, which become more negative with a decrease in the nanotubes concentration, such suspensions are the most stable.

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(1)
Bolbukh, Y. N.; Gunko, G. S.; Prikhod’ko, G. P.; Tertykh, V. A.; László, K.; Tóth, A.; Koczka, B. Multiwalled Carbon Nanotubes Modified With Biocompatible Compounds. Him. Fiz. Tehnol. Poverhni 2010, 1, 389-400.

Issue

Vol. 1 No. 4 (2010): Chemistry, Physics and Technology of Surface / Himia, Fizika ta Tehnologia Poverhni

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