Pseudoternary phase diagram of system with following components: oil (O) = RGO, surfactant (S) = Cremophore EL, and cosurfactant (COS) = Transcutol P. S
mix of 1:1, 2:1, and 3:1. The field area represents the microemulsion region. S
mix and W indicate surfactant/cosurfactant and water, respectively