Dispersions of Anatase in Ambient Temperature Ionic Liquids

✍ Scribed by Marek Kosmulski; Wladyslaw Janusz

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 31 KB
• Volume: 242
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2001.7760

✦ Synopsis

1-Ethyl-3-methylimidazolium (EMI) tetrachloroaluminate ("basic melt," AlCl 3 : EMICl ratio 0.94) and EMIBF 4 were studied as two examples of ambient temperature ionic liquids (salts that are liquid at room temperature). Dispersions of graphite and anatase (300 nm in diameter particles) in these media are surprisingly stable considering the high (about 4 mol dm -3 ) ionic strength. Electrostatic interactions play a rather insignificant role in the stability of anatase in EMIBF 4 , with the absolute value of electrophoretic mobility of the particles not exceeding 3 × 10 -10 m 2 V -1 s -1 . The sign of electrophoretic mobility depends on the presence of traces of water in EMIBF 4 . The particles carry a positive electrokinetic charge in dehydrated EMIBF 4 , and in the presence of 1% water (added as liquid water or absorbed from the atmosphere) the sign is reversed to negative.