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342 CHAPTER 14: Metal Oxide Nanopowder C max Supercritical saturation Solute concentration Nucleation and growth leads to monodispersity C min Nucleation ceases C s Saturated solubility Growth leads to polydispersity Particle growth stop I II III Time FIGURE 14.12 Once the nucleus is formed the growth starts. Figure 14.12 highlights how to control the particle size and shape with nucleation in relation to the concentration of solute with time.