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Crystallization mechanism. In the initial state (volume fraction, φ < 0.20), the NCs are homogeneously distributed in the droplet; when the volume fraction of NCs becomes critical (φ ≈ 0.20), a nucleation event starts inside the droplet. After a certain time, the NCs are nearly all assembled in the SP, which is still inside the droplet. Upon complete evaporation of the cyclohexane, the SP is covered by a layer of surfactants and suspended in water.
