Homogeneous nucleation and interfacial free energies

Homogeneous nucleation and interfacial free energies 9.12.1 Homogeneous nucleation... 

A central assertion of homogeneous nucleation theory is that interfacial free energy costs induce a spherical symmetry in the phase embryo. However, these simulation studies indicate that inter molecular interactions may not permit the development of spherical symmetry when these interactions are strong and highly asymmetric. 

The induction of the high supersaturation and the initiation of burst nucleation are explained by the theory of homogeneous nucleation. As discussed in Section 6.3.1, the interfacial free energy acts as an energy barrier for the nucleation reaction. Because the... 

The first subsection is about MTD calculations of the solid-liquid interfacial free energy. Accurate knowledge of this quantity is important to estimate the size of the critical nuclei and of the nucleation barriers using CNT. In the second subsection, we focus on homogeneous nucleation in several systems, including Lennard-Jones... 

It is important to note that r, given by Eq. (9.98), is identical with that obtained from Eq. (9.85) for homogeneous nucleation of a spherical body. The principal role of a nucleating heterogeneity is to reduce the barrier to nucleation caused by the surface interfacial free energy. Equations (9.99) and (9.100) show that in this situation the free energy barrier to nucleation decreases with decreasing 9, and approaches zero as 0 0. 

Where, Nhom. C, n, AGhom > k, T, a, and AP are the rate of homogeneous nu-cleation, the concentration of nucleation sites, the frequency factor for microcell nucleation, the change in Gibbs free energy of micro-ceU nucleation, Boltzmann s constant, the temperature, the interfacial tension, and the pressure drop in the nozzle, respectively. 

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