Identification of Shear Elasticity at Low Frequency in Liquid n-Heptadecane, Liquid Water and RT-Ionic Liquids [emim][Tf2N]

► Liquids are usually defined by an absence of (shear) elasticity at low frequency. ► This wisdom is false: finite shear elasticity exists at low frequency. ► Shear elasticity in liquid is accessible by probing its mechanical response. ► Improved liquid/substrate interactions are required to get the solid-like response.