Highlighting a Solid-Like Behavior in RTILs: Tri-octylmethylammonium Bis(trifluoromethanesulfonyl)imide TOMA-TFSI

Careful measurements of the dynamic response of the room -temperature ionic liquid (RTIL) trioctylmethylammonium bis(trifluoromethanesulfonyl)imide reveal that it exhibits actually a (low-frequency) solid-like response when solicited at the submillimeter scale with a low shear strain. The solid-like response is measured away from the glass transition (at around 100 °C above Tg), ruling out reminiscent transitional effects but suggesting that the dynamic properties of the RTIL are governed by long-range elastic intermolecular interactions.