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Isaac Y Miranda-Valdez¹, Tero Mäkinen¹, Sebastian Coffeng¹

¹Department of Applied Physics, Aalto University, P.O. Box 15600, 00076 Aalto, Espoo, Finland. isaac.mirandavaldez@aalto.fi.

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|December 12, 2024

Summary

Researchers optimized biobased methylcellulose-fiber foams for plastic replacement. Bayesian optimization identified compositions for strong closed-cell foams and robust fiber networks, enabling rational design of sustainable materials.

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Area of Science:

Materials Science
Biotechnology
Sustainable Polymers

Background:

Biobased materials are crucial for replacing conventional plastics.
Designing biobased materials with tailored mechanical properties remains a significant challenge.
Methylcellulose-fiber composites offer a promising avenue for sustainable material development.

Purpose of the Study:

To optimize the mechanical properties of fully biobased methylcellulose-fiber composite foams.
To establish a rational design approach for biobased materials by linking processing, structure, and properties.
To demonstrate the transferability of the optimization methodology to other biobased foam formulations.

Main Methods:

Utilized Bayesian optimization with Gaussian process regression to map material composition to mechanical properties.
Employed rheological properties of liquid biofiber suspensions as fast-to-measure descriptors for foam design.
Analyzed the low-dimensional subspace of rheological properties for efficient material design.

Main Results:

Identified two optimal compositions for methylcellulose-fiber foams: high methylcellulose for strong closed-cell foams, and high fiber content for methylcellulose-bound fiber networks.
Demonstrated that rheological properties effectively predict final foam mechanical properties.
Validated the approach for rational design of biobased solid foams.

Conclusions:

A novel Bayesian optimization approach enables the rational design of biobased foams with desired mechanical properties.
The methodology allows for the creation of methylcellulose-fiber foams suitable as plastic replacements.
The developed approach is transferable to a wider range of biobased foam compositions.