Soft Modular Robotic Cubes: Toward Replicating Morphogenetic Movements of the Embryo

Area of Science:

• Robotics
• Developmental Biology
• Biophysics

Background:

• Morphogenesis involves complex cell behaviors like migration and self-organization.
• Existing models often rely on rigid structures or complex hardware.
• Understanding these processes is key to developmental biology and regenerative medicine.

Purpose of the Study:

• To present a novel soft modular robotic system.
• To demonstrate its ability to reproduce fundamental cell behaviors during morphogenesis.
• To offer a simplified, inexpensive model for studying biological development.

Main Methods:

• Fabrication of composite elastomeric hollow cubes using soft lithography.
• Integration of permanent magnets for passive docking.
• Pneumatic actuation via controlled internal pressurization with micro air pumps.
• Utilizing coordinated inflation/deflation for module attachment/detachment and reconfiguration.

Main Results:

• The soft robotic system successfully reproduced collective cell migration, delamination, invagination, involution, and epiboly.
• Demonstrated simple forms of self-reconfiguration and spatial rearrangement of modules.
• Showcased effective module detachment and attachment through coordinated pneumatic actuation.
• Validated the system's ability to model the mechanics of collective cell behaviors.

Conclusions:

• Simple, pneumatically actuated soft robotic modules can effectively model complex cell behaviors in morphogenesis.
• The proposed system offers an inexpensive and tangible approach to synthetic morphogenetic systems.
• This work provides new insights into the physical mechanisms underlying embryonic development and cell organization.