@article {doi:10.1021/jp208425m,
	title = {A High-Pressure Study of the Effects of TiO2 Nanoparticles on the Structural Organization of Ionic Liquids},
	journal = {The Journal of Physical Chemistry C},
	volume = {115},
	number = {48},
	year = {2011},
	note = {n/a},
	pages = {23778-23783},
	abstract = {<p>The local structures between nano-TiO2 and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMI+TFS{\textendash}) and 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMI+TFS{\textendash}) were investigated using high-pressure infrared spectroscopy. No significant changes in C{\textendash}H spectral features of EMI+TFS{\textendash} were observed in the presence of nano-TiO2 under ambient pressure. As the EMI+TFS{\textendash}/nano-TiO2 mixture was compressed to 0.3 GPa, the imidazolium C{\textendash}H absorptions became two sharp bands at 3108 and 3168 cm{\textendash}1, respectively, and the alkyl C{\textendash}H stretching absorption exhibits a new band at 3010 cm{\textendash}1 associated with a weaker band at 3028 cm{\textendash}1. It appears that pressure stabilizes the isolated conformations due to pressure-enhanced imidazolium C{\textendash}H{\textendash}-nano-TiO2 interactions. Our results also reveal that alkyl C{\textendash}H groups play non-negligible roles at the conditions of high pressures. The results of BMI+TFS{\textendash}/nano-TiO2 are remarkably different from what is revealed for EMI+TFS{\textendash}/nano-TiO2. The spectral features and band frequencies of BMI+TFS{\textendash}/nano-TiO2 are almost identical to those of pure BMI+TFS{\textendash} 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.</p>
},
	doi = {10.1021/jp208425m},
	url = {http://pubs.acs.org/doi/abs/10.1021/jp208425m},
	author = {Chang, Hai-Chou and Chang, Shu-Chieh and Hung, Tzu-Chieh and Jiang, Jyh-Chiang and Jer-Lai Kuo and Lin, Sheng Hsien}
}
