Nanoconfined ionic liquids under electric fields

作者：Xie, Guoxin^*; Luo, Jianbin; Guo, Dan; Liu, Shuhai

来源：Applied Physics Letters, 2010, 96(4): 043112.

DOI：10.1063/1.3292213

• light interferometry
• liquid films
• negative ions
• organic compounds
• positive ions
• thickness measurement
• viscosity

The effect of external electric fields (EEFs) on ionic liquid films confined within a nanogap has been investigated by measuring the film thickness with the thin film interferometry and calculating the effective viscosity. Experimental results indicated that the film thickness of ionic liquids could be increased obviously by the application of EEFs with strengths weaker than the electric interactions between cationic head groups and anions. The effect of EEFs on the confined ionic liquid film with a shorter alkyl side chain is more noticeable. It is thought that the charged anions and headgroups of the cations are structured near electrified walls to form ordered layers and short alkyl side chains at the interfaces are aligned along the EEF direction due to induced dipoles.

• 出版日期2010-1-25
• 单位清华大学