Effects of pH on Water-Solubilization of Carbon Nanotube Using Microplasma in Aqueous Solution

被引：11
作者：
Imasaka, Kiminobu [1 ]
Kato, Yuki [1 ]
Khaled, Usama [1 ]
Suehiro, Junya [1 ]
机构：
[1] Kyushu Univ, Grad Sch Informat Sci & Elect Engn, Dept Elect Engn, Nishi Ku, Fukuoka 8190395, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2009年 / 48卷 / 06期
基金：
日本学术振兴会; 日本科学技术振兴机构;
关键词：
HIGH-VOLTAGE DISCHARGE; STREAMER CORONA DISCHARGE; ORGANIC-COMPOUNDS; DISSOLUTION; DISPERSION; OXIDATION; SURFACES;
D O I：
10.1143/JJAP.48.065004
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 Xray 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 (pH approximate to 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. (C) 2009 The Japan Society of Applied Physics
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页数：7
相关论文
共 37 条
[1]   A fast effective route to pH-dependent water-dispersion of oxidized single-walled carbon nanotubes [J].
Arrais, A ;
Diana, E ;
Pezzini, D ;
Rossetti, R ;
Boccaleri, E .
CARBON, 2006, 44 (03) :587-590
[2]   Formations of active species and by-products in water by pulsed high-voltage discharge [J].
Bian, Wenjuan ;
Zhou, Minghua ;
Lei, Lecheng .
PLASMA CHEMISTRY AND PLASMA PROCESSING, 2007, 27 (03) :337-348
[3]   FUNCTIONAL GROUPS ON SURFACES OF SOLIDS [J].
BOEHM, HP .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 1966, 5 (06) :533-&
[4]   Noncovalent engineering of carbon nanotube surfaces by rigid, functional conjugated polymers [J].
Chen, J ;
Liu, HY ;
Weimer, WA ;
Halls, MD ;
Waldeck, DH ;
Walker, GC .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (31) :9034-9035
[5]   Aggregation behavior of single-walled carbon nanotubes in dilute aqueous suspension [J].
Chen, Q ;
Saltiel, C ;
Manickavasagam, S ;
Schadler, LS ;
Siegel, RW ;
Yang, HC .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2004, 280 (01) :91-97
[6]   PRELIMINARY INVESTIGATION OF PREBREAKDOWN PHENOMENA AND CHEMICAL-REACTIONS USING A PULSED HIGH-VOLTAGE DISCHARGE IN WATER [J].
CLEMENTS, JS ;
SATO, M ;
DAVIS, RH .
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, 1987, 23 (02) :224-235
[7]   Functionalization and dissolution of single-walled carbon nanotubes by chemical-physical and electrochemical treatments [J].
Curulli, A ;
Cesaro, SN ;
Coppe, A ;
Silvestri, C ;
Palleschi, G .
MICROCHIMICA ACTA, 2006, 152 (3-4) :225-232
[8]  
Feng W, 2003, CHINESE PHYS LETT, V20, P753, DOI 10.1088/0256-307X/20/5/346
[9]  
Hamon MA, 1999, ADV MATER, V11, P834, DOI 10.1002/(SICI)1521-4095(199907)11:10<834::AID-ADMA834>3.0.CO
[10]  
2-R
1234