Revolutionizing Biomedicine and Robotics with Structurally Reprogrammable Magnetic Metamaterials

A groundbreaking collaboration between scientists from Universidad Carlos III de Madrid (UC3M) and Harvard University has led to the experimental demonstration of the ability to reprogram the mechanical and structural behavior of innovative magnetic metamaterials without altering their composition. This advancement paves the way for transformative applications in various fields, including biomedicine and soft robotics.

The research, recently unveiled in the prestigious journal Advanced Materials, unveils the methodology for reprogramming these mechanical metamaterials using strategically placed flexible magnets within their structure.

“What sets our approach apart is the integration of small flexible magnets within a rotating rhomboid matrix, enabling the modification of the structure’s stiffness and energy absorption capacity by simply adjusting the distribution of these magnets or applying an external magnetic field. This imparts unique properties not found in traditional materials or natural substances,” explains Daniel García-González, a key contributor to the study from UC3M’s Department of Continuum Mechanics and Structural Analysis.

This breakthrough marks a significant stride towards the development of reconfigurable mechanical structures, with vast potential applications in robotics, impact protection, and aerospace engineering, as highlighted by the researchers.

“From impact protection structures and adaptive components in soft robotics to intelligent shock-absorbing systems in exoskeletons, the scope for utilizing this type of metastructure is virtually limitless. In sports, these structures could enhance the mechanical response of sports shoe soles by adjusting the flexibility or rigidity of specific areas to optimize the footfall of athletes,” the team elaborates.

Moreover, the realm of biomedicine stands to benefit immensely from these innovations. For instance, introducing modifications to these structures within a blocked blood vessel and employing an external magnetic field could expand the matrix to clear the obstruction, offering promising prospects for medical interventions, as noted by researcher Josué Aranda Ruiz from UC3M’s Department of Continuum Mechanics and Structural Analysis.

The study conducted by UC3M and Harvard researchers involved a meticulous analysis of different materials, their magnetic orientations, and subsequent impact on the metamaterial’s behavior. By strategically reorienting the magnets within the structure, the team demonstrated significant adjustments in the material’s response, culminating in dynamic impact testing on larger structures.

“Through manipulation of magnet positions to modulate magnetic interactions, we can elicit distinct behaviors in the material,” adds Carlos Pérez-García, another key researcher from UC3M’s Department of Continuum Mechanics and Structural Analysis.