Hydrodynamic manipulation of nano-objects by optically induced thermo-osmotic flows

Area of Science:

• Nanotechnology
• Surface Science
• Fluid Dynamics

Background:

• Microscale manipulation of nano-objects is crucial for advanced materials, fluidics, sensors, and medical diagnostics.
• Existing methods for nano-object manipulation face limitations in precision and scalability.

Purpose of the Study:

• To investigate the use of hydrodynamic boundary flows for trapping and manipulating nano-objects near surfaces.
• To develop a method for precise nanoparticle positioning and guidance using controlled fluid dynamics.

Main Methods:

• Triggering thermo-osmotic flows via optically generated local temperature fields at a gold-liquid interface.
• Modulating van der Waals and double layer interactions to control nano-object behavior.
• Utilizing rapid multiplexing of flow fields for parallel manipulation.

Main Results:

• Demonstrated successful trapping and manipulation of nano-objects using hydrodynamic boundary flows.
• Achieved precise nanoparticle positioning and guidance through combined hydrodynamic and interparticle forces.
• Enabled parallel manipulation of multiple nano-objects and generation of complex flow fields.

Conclusions:

• Hydrodynamic boundary flows offer a novel and effective approach for nanoscale manipulation.
• This technique has significant implications for plasmonic nanotweezers and thermo-plasmonic trapping systems.
• Paves the way for advanced nanoscopic manipulation with boundary flow systems.