From shaping to functionalization of micro-droplets and particles

Area of Science:

• Materials Science
• Chemical Engineering
• Physics

Background:

• Microdroplet and microparticle structure critically influences physicochemical reactions and functionality.
• Precise shape control is essential for tailoring microdroplet and microparticle functions in various applications.

Purpose of the Study:

• To review methodologies for droplet shaping, categorizing them into passive and active approaches.
• To highlight the latest technologies and applications of shaped microdroplets and microparticles.
• To analyze the advantages and disadvantages of different shaping methods and suggest future research directions.

Main Methods:

• Passive approaches: batch emulsification, solvent evaporation/diffusion, micromolding, microfluidics.
• Active approaches: utilizing external forces like electrical/magnetic fields and optical lithography.
• Review of recent advancements in biological, optical, robotic, and environmental applications.

Main Results:

• Categorization of droplet shaping techniques into passive (no external forces) and active (external forces applied).
• Detailed overview of specific methods within each category, including microfluidics and field-based manipulation.
• Identification of emerging applications in diverse scientific and technological fields.

Conclusions:

• Droplet shaping technologies are vital for advanced applications.
• Both passive and active methods offer unique advantages for microdroplet and microparticle fabrication.
• Further research is needed to optimize existing methods and explore novel shaping techniques.