Effects of pH on Water-Solubilization of Carbon Nanotube Using Microplasma in Aqueous Solution
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概要
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The authors have previously proposed a novel technique for the preparation of water-soluble carbon nanotubes (CNTs) using microplasma generated by a pulsed streamer discharge in water. This paper describes effects of pH values on water-solubility of single-walled CNT (SWCNT) treated by the microplasma. The SWCNT treated under basic conditions showed two times higher solubility compared to that treated under neutral condition, whereas the SWCNT solubility considerably decreased under acidic conditions. Based on optical emission measurements of microplasma showed that radical formation was not pH sensitive. Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis showed that the microplasma treated SWCNT was functionalized with –COO- groups with little pH dependence. In contrary, clear pH dependence was observed for zeta potential of the microplasma-treated SWCNT. The lowest zeta potential was $-46$ mV, which was obtained with basic solution adjusted by NH3 ($\mathrm{pH} \approx 9$). The SWCNT treated under basic conditions was more negatively charged due to suppressed protonation of –COO- groups. As a result, the electrostatic repulsion force between SWCNTs could overcome van der Waals force improving their solubility and dispersibility in water.
- 2009-06-25
著者
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SUEHIRO Junya
Department of Electrical and Electronic Systems Engineering Graduate School of Information Science a
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IMASAKA Kiminobu
Department of Electrical and Electronic Systems Engineering, Graduate School of Information Science
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Kato Yuki
Department Of Applied Mathematics And Physics Tottori University
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Khaled Usama
Department of Electrical Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Imasaka Kiminobu
Department of Electrical Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Suehiro Junya
Department of Electrical Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Kato Yuki
Department of Electrical Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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