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Microhoneycomb Monoliths Prepared by the Unidirectional Freeze-drying of Cellulose Nanofiber Based Sols: Method and Extensions

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Enhancing Composite Toughness Through Hierarchical Interphase Formation.

Sumit Gupta¹, Tanvir Sohail², Marti Checa³

¹Carbon and Composites Group, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|December 25, 2023

Summary

This summary is machine-generated.

Researchers developed a novel hierarchical architecture using chemically transformable nanofibers to enhance fiber-matrix bonding in composites. This significantly improves composite strength and toughness for high-performance applications.

Keywords:

fiber-matrix adhesion fiber-matrix interphase fiber-reinforced composites hierarchical architecture nanofiber scaffold

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Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

Achieving high strength and ductility simultaneously in fiber-reinforced composites is a significant challenge.
Existing methods often struggle to optimize both properties, limiting composite performance.
The fiber-matrix interphase is critical for load transfer and overall composite integrity.

Purpose of the Study:

To develop a hierarchical architecture that enhances both strength and ductility in fiber-reinforced composites.
To engineer a toughened fiber-matrix interphase using chemically transformable nanofibers.
To investigate the mechanism of improved adhesion and stress transfer in nanoengineered composites.

Main Methods:

Electrospinning of high aspect ratio thermoplastic nanofibers onto micrometer-scale carbon fibers.
Utilizing chemically transformable nanofibers to create covalent bonding with the polymer matrix.
Employing molecular dynamics simulations and atomic force microscopy to analyze interphase properties and adhesion.

Main Results:

A hierarchical nanofiber scaffold was created, physically intertwined with carbon fibers and covalently bonded with the matrix.
The nanofiber scaffold facilitated efficient stress transfer and enhanced composite toughness.
Nanoengineered composites demonstrated approximately 60% improved in-plane shear strength and 100% improved toughness.

Conclusions:

The developed hierarchical architecture effectively toughens the fiber-matrix interphase, overcoming the strength-ductility trade-off.
This novel approach enables the creation of high-performance, toughened composites.
The strategy offers a new pathway for advanced composite material manufacturing.