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利用浓硫酸和浓硝酸对单壁碳纳米管(SWNTs)进行氧化酸处理,制备羧基化单壁碳纳米管(SWNTsCOOH),以两亲性三嵌段聚醚Pluronic F127{(PEO)_(99)(PPO)_(65)(PEO)_(99)}为分散剂,制备SWNTs-COOH/F127分散液。采用激光粒度分析仪、傅里叶红外光谱、紫外-可见光吸收光谱、拉曼光谱对所制备分散液进行表征,并比较了SWNTs、F127修饰SWNTs、羧基化SWNTs、F127修饰羧基化SWNTs 4种水分散液的分散情况。结果表明,经混酸处理后,单壁碳纳米管表面成功修饰上羧基,相对于原始碳纳米管,其在水中的分散性及稳定性大大地提高。制备的SWNTs-COOH/F127分散液在4 000 r/min离心30 min未见沉淀,室温静置30 d以上不发生絮凝。
Single-walled carbon nanotubes (SWNTs) were treated with concentrated sulfuric acid and concentrated nitric acid to oxidize the SWNTs to prepare carboxylated single-walled carbon nanotubes (SWNTsCOOH). The amphiphilic Pluronic F127 {(PEO) _ (99 ) (PPO) _ (65) (PEO) _ (99)} as dispersant, a SWNTs-COOH / F127 dispersion was prepared. The prepared dispersions were characterized by laser particle size analyzer, Fourier transform infrared spectroscopy, UV-Vis absorption spectroscopy and Raman spectroscopy. The four kinds of water were compared including SWNTs, F127 modified SWNTs, carboxylated SWNTs, F127 modified carboxylated SWNTs Dispersion dispersion. The results showed that the carboxyl groups were successfully modified on the surface of single-walled carbon nanotubes by mixed acid treatment. Compared with the original carbon nanotubes, their dispersibility and stability in water were greatly improved. The prepared SWNTs-COOH / F127 dispersion was centrifuged at 4 000 r / min for 30 min without precipitation, and allowed to stand at room temperature for more than 30 days without flocculation.