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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
