Design of textured multi-layered structures via magnetically assisted slip casting

Area of Science:

• Materials Science
• Biomimetics
• Colloid Science

Background:

• Natural multi-layered composites exhibit unique functional properties due to the ordered orientation of their inorganic building blocks.
• Examples include the structural integrity of bivalve shells and crustacean exoskeletons.
• Artificial replication of these microstructures is key for advanced material design.

Purpose of the Study:

• To systematically explore the design space and limitations of magnetically assisted slip casting (MASC).
• To theoretically and experimentally investigate the forces governing particle assembly in MASC.
• To establish design guidelines for fabricating bio-inspired composites with tailored multi-scale structures.

Main Methods:

• Utilized magnetically assisted slip casting (MASC), a colloidal process for additive manufacturing.
• Employed magnetically responsive alumina platelets in a low-viscosity aqueous suspension.
• Analyzed particle dynamics and alignment under rotating magnetic fields, defining process boundary conditions.

Main Results:

• Quantified the torques acting on particles during the MASC assembly process.
• Defined the operational parameters for MASC using alumina platelets.
• Demonstrated control over particle orientation for creating textured microstructures.

Conclusions:

• MASC offers a viable route for fabricating complex, bio-inspired multi-layered composites.
• Understanding the fundamental physics of particle assembly is crucial for process optimization.
• This research provides a framework for designing advanced materials with customized properties for diverse applications.