Transactions of the Indian Institute of Metals

, Volume 70, Issue 10, pp 2629–2639 | Cite as

Homogenization for Dispersion and Reduction in Length of Carbon Nanotubes

  • Hindumathi Ramaraj
  • Jagannatham Madiga
  • Hemaprabha Elangovan
  • Prathap Haridoss
  • Chandra P. Sharma
Technical Paper


An important aspect that limits the use of carbon nanotubes (CNTs) is the difficulty in obtaining homogeneously dispersed CNTs of uniform length. Hence, homogenization of multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) was carried out using bullet blender and the dispersion behavior was compared with that of ultrasonication. 1% sodium dodecyl sulphate (SDS), Triton-x-100 and polyethylene glycol 4000 were used as dispersing agents during homogenization. The dispersed CNTs were studied using transmission electron microscopy, ImageJ and Raman spectroscopy. Though dispersion and reduction in length of MWCNTs were observed both with ultrasonication and homogenization, lowest length range with about 75% reduction in polydispersity index was obtained on homogenization. Longer time of ultrasonication resulted in damage to small MWCNTs. Well dispersed and shorter MWCNTs were obtained with Triton-x-100 while reduction in length was minimum with SDS. SWCNTs of less than 1 μm length could be obtained by homogenization with Triton-x-100.


Carbon nanotubes Raman spectroscopy High resolution electron microscopy Biomedical applications Homogenization 



We thank NEXT ADVANCE Inc., USA for permitting us to perform experiments using Bullet Blender. We also thank Dr. Joseph Berkmans for helping in TEM imaging.


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Copyright information

© The Indian Institute of Metals - IIM 2017

Authors and Affiliations

  • Hindumathi Ramaraj
    • 1
  • Jagannatham Madiga
    • 2
  • Hemaprabha Elangovan
    • 2
  • Prathap Haridoss
    • 2
  • Chandra P. Sharma
    • 3
  1. 1.Department of BiotechnologyIndian Institute of Technology MadrasChennaiIndia
  2. 2.Department of Metallurgical and Materials EngineeringIndian Institute of Technology MadrasChennaiIndia
  3. 3.Biomedical Technology WingSree Chitra Tirunal Institute for Medical Sciences and TechnologyThiruvananthapuramIndia

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