Sonication-assisted dispersion of carbon nanotubes in aqueous solutions of the anionic surfactant SDBS:The role of sonication energy  

作　　者：YANG Kun YI ZiLi JING QingFeng YUE RenLiang JIANG Wei LIN DaoHui 

机构地区：[1]Department of Environmental Science,Zhejiang University [2]Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control [3]Institute of Process Engineering,Chinese Academy of Sciences [4]Environment Research Institute,Shandong University

出　　处：《Chinese Science Bulletin》2013年第18期2082-2090,共9页

基　　金：supported by the Zhejiang Provincial Natural Science Foundation of China (R5110004);the National Natural Science Foundation of China (21137003 and 40973065);the National Science & Technology Pillar Program of China (2013BAC01B01);the Scholarship Award for Excellent Doctoral Student Granted by Ministry of Education;the Fundamental Research Funds for the Central Universities;the Key Innovation Team for Science and Technology of Zhejiang Province (2009R50047)

摘　　要：Sonication is a powerful technique to promote the dispersion of carbon nanotubes(CNTs) and enhance their solubility;this is necessary for CNT applications,especially in the biochemical and biomedical fields.In this study,batch experiments were conducted to evaluate the role of sonication energy on the dispersion of CNTs in the presence of a widely used anionic surfactant,sodium dodecylbenzene sulfonate(SDBS).It was observed that the concentration of dispersed CNTs in the SDBS solution depended on the sonication energy,but not the sonication time or output power of the sonicator alone.The amount of dispersed CNTs was positively correlated with the concentrations of SDBS and CNTs,and the length of the CNTs.The promotion of oxygen-containing functional groups on the dispersed CNTs was observed at relatively low sonication energies.The optimal energy,i.e.the minimum energy supplied by sonication to achieve a saturated suspension of dispersed CNTs in the SDBS solution,was CNT diameter-dependent,because of the larger vdW forces between tubes of smaller diameter.An exponential decay curve was constructed for the optimal energy values as a function of the outer CNT diameter,to assist in determining the energy needed to disperse CNTs.Sonication is a powerful technique to promote the dispersion of carbon nanotubes （CNTs） and enhance their solubility; this is necessary for CNT applications, especially in the biochemical and biomedical fields. In this study, batch experiments were con- ducted to evaluate the role of sonication energy on the dispersion of CNTs in the presence of a widely used anionic surfactant, sodium dodecylbenzene sulfonate （SDBS）. It was observed that the concentration of dispersed CNTs in the SDBS solution de- pended on the sonication energy, but not the sonication time or output power of the sonicator alone. The amount of dispersed CNTs was positively correlated with the concentrations of SDBS and CNTs, and the length of the CNTs. The promotion of oxy- gen-containing functional groups on the dispersed CNTs was observed at relatively low sonication energies. The optimal energy, i.e. the minimum energy supplied by sonication to achieve a saturated suspension of dispersed CNTs in the SDBS solution, was CNT diameter-dependent, because of the larger vdW forces between tubes of smaller diameter. An exponential decay curve was constructed for the optimal energy values as a function of the outer CNT diameter, to assist in determining the energy needed to disperse CNTs.

关 键 词：十二烷基苯磺酸钠 阴离子表面活性剂 碳纳米管 超声处理 分散性 声能量 水溶液 含氧官能团 

分 类 号：O647.2[理学—物理化学] X703.1[理学—化学]