Microrheological Investigations in Ionic Liquids Using Optical Trapping Techniques

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• 作者：Richard D. Dear ; Emma K. Worrall ; William D. Gault ; Grant A. D. Ritchie
• 刊名：Journal of Physical Chemistry B
• 出版年：2013
• 出版时间：September 12, 2013
• 年：2013
• 卷：117
• 期：36
• 页码：10567-10571
• 全文大小：256K
• 年卷期：v.117,no.36(September 12, 2013)
• ISSN：1520-5207

文摘

In this paper, we demonstrate optical trapping of melamine particles (d 鈮?2.3 渭m) within the pure ionic liquid ethylammonium nitrate (EAN) and show the first microrheological investigations of these important compounds using this technique. By analyzing the power spectrum of a particle trapped in EAN, we monitor the variation in viscous drag that it experiences in proximity to the sample coverslip, showing excellent agreement with Fax茅n鈥檚 law. We also demonstrate hydrodynamic coupling between pairs of trapped particles. Finally, we explore temperature-dependent viscosity changes in 渭L samples of EAN as a further example of microrheological investigations of ILs.