標題: A High-Pressure Study of the Effects of TiO2 Nanoparticles on the Structural Organization of Ionic Liquids
作者: Chang, Hai-Chou
Chang, Shu-Chieh
Hung, Tzu-Chieh
Jiang, Jyh-Chiang
Kuo, Jer-Lai
Lin, Sheng Hsien
應用化學系
Department of Applied Chemistry
公開日期: 8-十二月-2011
摘要: The local structures between nano-TiO2 and 1-ethyl-3-methylimidazolium trifluorornethanesulfonate (EMI+TFS- ) and 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMI+TES-) were investigated using high-pressure infrared spectroscopy. No significant changes in C-H spectral features of EMI+TFS- were observed in the presence of nano-TiO2 under ambient pressure. As the EMI+TES-/nano-TiO2 mixture was compressed to 0.3 GPa, the imidazolium C-H absorptions became two sharp bands at 3108 and 3168 cm(-1), respectively, and the alkyl C-H stretching absorption exhibits a new band at 3010 cm(-1) associated with a weaker band at 3028 cm(-1). It appears that pressure stabilizes the isolated conformations due to pressure-enhanced imidazolium C-H-nano-TiO2 interactions. Our results also reveal that alkyl C-H groups play non-negligible roles at the conditions of high pressures. The results of BMI+TFS-/nano-TiO2 are remarkably different from what is revealed for EMI+TFS-/nano-TiO2. The spectral features and band frequencies of BMI+TFS-/nano-TiO2 are almost identical to those of pure BMI+TES- under various pressures. This study demonstrates that changes to the alkyl chain length of the cation could be made to control the order and strength of ionic liquid/nano-TiO2 interactions.
URI: http://dx.doi.org/10.1021/jp208425m
http://hdl.handle.net/11536/150419
ISSN: 1932-7447
DOI: 10.1021/jp208425m
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 115
起始頁: 23778
結束頁: 23783
顯示於類別:期刊論文