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What are particles deposit mechanisms?

  • Brownian diffusion facilitates a surface encounter,
  • thermophoresis conducts them toward cold areas,
  • an electrostatic field attracts particles.

For nanoscale particles (all things equal moreover), electrostatic forces dominate.

The probability of deposit depends on the thermal agitation, but also on the condition of the wall.

The temperature differential and especially the wall electric charge are favorable parameters to the deposit.

Deposit on a nanoparticles wall (10, 30, 50 nm): (1) only subject to thermal diffusion, (2) attracted by a cold wall, (3) attracted by an electrostatically charged wall.