Controlled Molecular Assembly via Dynamic Confinement of Solvent

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Assembly dynamics differ significantly between ultrasmall and larger scales.
• Controlling molecular assembly at the nanoscale is crucial for advanced materials and nanotechnology.

Purpose of the Study:

• To investigate the assembly dynamics of polymers from subfemtoliter aqueous droplets.
• To demonstrate precise control over nanoscale feature formation using microfluidic techniques.
• To explore the potential for programmable synthesis and 3D nanoprinting.

Main Methods:

• Utilized an independently controlled microfluidic probe integrated with an atomic force microscope (AFM).
• Employed subfemtoliter aqueous droplets containing polymers for assembly.
• Investigated the influence of initial droplet shape and solute concentration on assembly outcomes.

Main Results:

• Achieved well-defined polymer features with dimensions as small as tens of nanometers.
• Demonstrated that droplet shape and solute concentration significantly impact final polymer assembly.
• Showcased control over feature geometry, distribution, and molecular packing within nanoscale features.

Conclusions:

• Ultrasmall droplet assembly offers unique control over molecular organization.
• This technique provides new pathways for programmable synthesis in chemistry and materials science.
• The findings pave the way for advancements in three-dimensional (3D) nanoprinting and additive manufacturing.