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8166631 
Journal Article 
Urea-melt solubilization of single-walled carbon nanotubes 
Ford, WE; Jung, A; Hirsch, A; Graupner, R; Scholz, F; Yasuda, A; Wessels, JM 
2006 
Yes 
Advanced Materials
ISSN: 0935-9648
EISSN: 1521-4095 
18 
9 
1193-1197 
English 
A new method for urea-melt solubilizing acid-purified single-walled carbon nanotubes, is presented. The urea-modified single-walled carbon nanotubes (U-SWNTs) were isolated from the extracts by precipitation with sodium perchlorate and redissolved in water after the removal of excess sodium perchlorate by washing. The optimal reaction temperature for the urea-melt process was determined to be around 150°C, and differential scanning calorimetric measurements indicated that the reaction occurred rapidly when the temperature reached 140°C. This process is quick, environmental-friendly, provides full-length SWNTs with excellent water solubility.