A18 超音波霧化によるコイル状カーボンナノチューブの濃縮分離

概要

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Although rings of carbon nanotubes (CNTs) are predicted to have interesting magnetic properties, facile preparation or isolation methods of the rings with high purity are not yet reported. We describe here a convenient method for the isolation of ring- or coil-shaped single walled carbon nanotubes (SWCNTs) using ultrasonic atomization. A suspension of SWCNTs was bath-sonicated at 20℃ and the resulted mist above the surface was exposed to the flow of air (Figure 1). The black solid flowed down into the container (Teflon tube) was found to consist of ring- or coil-shaped SWCNTs exclusively by TEM analyses (Figures 2 and 3), while the ones from other parts of the glassware and residue included only little amount of the rings or coils. They have round or oval shape with 1.0-3.3μm in diameters, and some of them may be interlocked. The method presented here is very practical to isolate one specific shape of CNTs from the mixture by combined use of ultrasonic atomization and carrier gas. We believe that this finding accelerates the science and application of ring- or coil-shaped CNTs.
日本ソノケミストリー学会の論文
2005-10-14