Dendritic nanoparticle self-assembly from drying a sessile nanofluid droplet

Area of Science:

• Materials Science
• Fluid Dynamics
• Nanotechnology

Background:

• Particle deposition patterns from drying droplets are crucial in various applications.
• Understanding self-assembly mechanisms in nanofluids is key to controlling material structures.

Purpose of the Study:

• To investigate the formation of dendritic particle deposition patterns from drying sessile nanofluid droplets.
• To simulate and analyze the self-assembling behavior of particles during droplet evaporation.

Main Methods:

• Experimental observation of dendritic patterns in dried nanofluid droplets.
• Development of a 3D lattice-gas kinetic Monte Carlo model for simulation.
• Parameter study varying chemical potentials and interaction energies.

Main Results:

• Dendritic particle deposition with a central core and branched structures was observed.
• Simulation results showed qualitative agreement with experimental findings.
• Increased particle concentration led to thicker branches and larger central cores.

Conclusions:

• Evaporation-induced particle self-assembly dictates dendritic pattern formation in drying nanofluids.
• The developed model successfully simulates the observed self-assembly behavior.
• Controlling particle concentration influences the scale of dendritic structures.