Figure 1From: Surfactant-free ionic liquid-based nanofluids with remarkable thermal conductivity enhancement at very low loading of graphene Digital photograph of (a) pure [HMIM]BF 4 , (b) 0.03% of GE/[HMIM]BF 4 , and (c) 0.03% of MWCNT/[HMIM]BF 4 . Back to article page