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Surface Induced Order in Room Temperature Ionic Liquids and Its Effect on Piezoelectric Response
Neelanjana Mukherjee1, G J Blanchard1
1Michigan State University, Department of Chemistry, 578 S. Shaw Lane, East Lansing, Michigan 48824, United States.
None:
We compare the direct piezoelectric response of the room temperature ionic liquid (RTIL) N-butylpyridinium bis-(trifluoromethyl-sulfonyl)-imide (C4Py TFSI) under conditions where pressure is applied to the bulk RTIL in a vessel with a bare ITO interface and a vessel with an ITO interface modified with a monolayer of a pyridinium-containing amphiphile. We find that the presence of a single monolayer of the pyridinium amphiphile poises the RTIL structurally to produce a measurably larger piezoelectric response. The extent of order imposed by the presence of the monolayer is likely limited by the intrinsic surface roughness and structural irregularity of the ITO-coated glass support used.
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