High-throughput sorting of nanoparticles with light-patterned dielectrophoresis force

Area of Science:

• Nanotechnology
• Microfluidics
• Biophysics

Background:

• Precise manipulation and separation of nanoparticles are crucial for various applications.
• Existing methods often struggle with separating particles of identical mass but different sizes.
• Microfluidic devices offer a controlled environment for particle manipulation.

Purpose of the Study:

• To develop and demonstrate a size-based sorting method for nanoparticles using microfluidics.
• To leverage light-patterned dielectrophoresis (DEP) for precise nanoparticle manipulation.
• To achieve high-throughput separation of nanoparticles based on size.

Main Methods:

• Utilized microfluidic channels for particle manipulation.
• Applied light-patterned dielectrophoresis (DEP) force in conjunction with hydrodynamic forces.
• Conducted numerical predictions to analyze the influence of particle size, velocity, and electrical permittivity on sorting efficiency.

Main Results:

• Successfully manipulated random nanoparticle distributions into a single stream.
• Demonstrated size-dependent particle trajectories, enabling size-based separation.
• Achieved precise separation of nanoparticles with identical mass but varying sizes.

Conclusions:

• The developed light-patterned DEP method offers a flexible and high-throughput solution for nanoparticle size-based sorting.
• This technique advances nanoparticle manipulation capabilities in microfluidic systems.
• The findings have implications for applications requiring precise control over nanoparticle populations.