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Bio-Inspired Topologically Constrained, Interlocking-like Cellulose Architectures via Sacrificial Oligomer

Yipeng Chen¹, Kayoko Kobayashi¹, Qingfeng Sun²

¹Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.

ACS Applied Materials & Interfaces

|June 19, 2026

Summary

Researchers developed a new bioinspired material, topologically interlocking-like cellulose (TICell), that overcomes the strength-toughness trade-off. This innovative material demonstrates superior mechanical properties, offering a sustainable solution for advanced structural applications.

Keywords:

bioinspired cellulose inorganic oligomer mechanical properties topological structure

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Area of Science:

Materials Science
Biomaterials Engineering
Polymer Science

Background:

The strength-toughness trade-off is a major limitation in developing high-performance bioinspired structural materials.
Existing materials often compromise toughness for strength or vice versa, hindering broader applications.

Purpose of the Study:

To engineer a novel cellulose-based material with enhanced strength and toughness.
To explore a new templating and cross-linking strategy for creating advanced bioinspired materials.

Main Methods:

Development of topologically interlocking-like cellulose (TICell) using sacrificial oligomer templating with calcium phosphate oligomeric clusters (CPOs).
Utilized citric acid treatment for template removal and simultaneous covalent cross-linking of cellulose.
Employed multiscale characterization to analyze the material's nanoscale architecture and mechanical properties.

Main Results:

TICell exhibits a unique, continuous, percolated network of puzzle-like interlocking modules at the nanoscale.
The interlocked topology effectively suppresses crack propagation and promotes progressive energy dissipation.
Achieved a strength of 226 MPa and a fracture toughness of 7.0 kJ m⁻², significantly outperforming natural and synthetic polymers.

Conclusions:

The developed TICell material offers a sustainable route to damage-tolerant, biobased structural materials.
Mechanical performance can be primarily governed by topological design rather than solely by composition or crystallinity.
This approach provides a promising strategy for creating next-generation structural materials with exceptional mechanical resilience.