Condensation route of evolution of nanodispersed substances

Abstract

Numerous experimental data indicate that nanosystems develop by stages. The evolution route of closed nanosystems includes stages of nanoparticle nucleation, growth, ripening, and agglomeration, and texture and composition ordering. In closed systems, nanodispersed sub stances occur in the nano state for a limited period of time, which can be changed by varying the supersaturation of the medium with respect to nanoparticles. Nanoparticles in open sys tems tend to degrade due to chemical transformations, dissolution, or evaporation and the lifetime of open systems can be estimated. At every stage of development of nanosystems, the rates of variation of the state parameters of nanoparticles fluctuate over a scale much exceeding the molecular scale. The behavior of the set of nanoparticles is described by a Fokker-Planck type equation, which may underlie the formulation of the principal equation of physicochemi cal evolution of nanosystem.

Particle collision frequency and particle density at equilibrium. Part 2

“…The problem of the possible ways for nano particles stabilization is considered in [31,32]. The evolution of nano particle shapes during coalescence has been investigated in [23,39,40].…”