<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Chang, Hai-Chou</style></author><author><style face="normal" font="default" size="100%">Chang, Shu-Chieh</style></author><author><style face="normal" font="default" size="100%">Hung, Tzu-Chieh</style></author><author><style face="normal" font="default" size="100%">Jiang, Jyh-Chiang</style></author><author><style face="normal" font="default" size="100%">Jer-Lai Kuo</style></author><author><style face="normal" font="default" size="100%">Lin, Sheng Hsien</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A High-Pressure Study of the Effects of TiO2 Nanoparticles on the Structural Organization of Ionic Liquids</style></title><secondary-title><style face="normal" font="default" size="100%">The Journal of Physical Chemistry C</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://pubs.acs.org/doi/abs/10.1021/jp208425m</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">48</style></number><volume><style face="normal" font="default" size="100%">115</style></volume><pages><style face="normal" font="default" size="100%">23778-23783</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The local structures between nano-TiO2 and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMI+TFS–) and 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMI+TFS–) 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+TFS–/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+TFS– 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.&lt;/p&gt;
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