Design and reinforcement: vertically aligned carbon nanotube-based sandwich composites

Area of Science:

• Materials Science
• Nanotechnology
• Composite Materials

Background:

• Polymer composites reinforced with carbon nanotubes (CNTs) often suffer from poor CNT dispersion and random orientation, limiting their mechanical properties.
• Carbon fibers (CFs) are effective structural reinforcements, but combining them with CNTs requires advanced architectures for optimal synergy.

Purpose of the Study:

• To design and fabricate high-performance sandwich composites using vertically aligned carbon nanotubes (VACNTs) and carbon fibers (CFs).
• To investigate the potential of VACNTs as an interfacial layer to improve composite rigidity and damping.
• To evaluate the suitability of these novel composites for aerospace and transportation applications.

Main Methods:

• Fabrication of freestanding VACNT arrays.
• Stacking VACNTs and CF fabrics to create layered 3D architectures.
• Infiltration of the stacked structures with an epoxy matrix to form sandwich composites.
• Comparative analysis of mechanical properties (flexural rigidity, damping) with traditional CF/epoxy laminates.

Main Results:

• VACNT-based sandwich composites demonstrated significantly higher flexural rigidity compared to CF/epoxy laminates.
• Enhanced damping properties were observed in the VACNT-based composites.
• The effective integration of VACNTs as an interfacial layer was identified as the key factor for improved performance.
• The developed composites offer a lighter weight alternative for structural applications.

Conclusions:

• VACNT-based sandwich composites represent a promising advancement in high-performance materials.
• The integration strategy effectively addresses CNT dispersion challenges, leading to superior mechanical and damping characteristics.
• These lightweight, high-rigidity composites are well-suited for demanding applications in aerospace and transportation industries.