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碳纳米管在水性体系中的分散性能及机理

DOI: 10.3969/j.issn.1006-7043.201303081

Keywords: 碳纳米管, 表面活性剂, 超声处理, 酸处理, 分散性, 机理, 水性体系

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Abstract:

为了探求碳纳米管在水性体系中的有效分散方法及分散性能,以阿拉伯胶(GA)、曲拉通(Tx100)、十六烷基三甲基溴化铵(TB)、十二烷基磺酸钠(SDS) 4种表面活性剂(SAA)为多壁碳纳米管(MWNTs)的分散剂,采用SAA超声分散法及酸处理法制备了11种分散液。结合静置离心法研究了不同种类SAA单掺的分散效果,结果表明:单掺GA对MWNTs分散效果最好,离心170 min后才开始分层。首次采用紫外分光光谱吸光度法评价了不同种类SAA复掺及SAA掺量变化对MWNTs分散性能的影响,测试结果表明:复掺Tx100与GA效果最好;当GA掺量为0.45 g/L时效果最好;比较二者分散效果后知:GA掺量为0.45g/L的悬浮液分散效果最佳。采用傅里叶红外光谱(FTIR)检测混酸氧化后MWNTs表面的基团,分析可知:经混酸处理后,MWNTs表面成功引入了羟基和羧基等官能团。

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