Multifunctional Chiral Nematic-Structured Cellulose Nanocrystal-Polyaniline Aerogels for Enhanced and Intelligent...

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetism

Background:

• Chiral structures enhance electromagnetic wave absorption (EMA).
• Biobased materials offer sustainable solutions.
• Cellulose nanocrystals (CNCs) and polyaniline (PANI) are promising components for functional materials.

Purpose of the Study:

• To fabricate biobased, multifunctional aerogels from CNCs and PANI.
• To achieve robust, stimuli-responsive EMA performance, thermal insulation, and flame retardancy.
• To investigate the synergistic effects of chiral architecture and conductive networks on EMA.

Main Methods:

• Fabrication of chiral nematic CNC/PANI aerogels.
• Characterization of structural, thermal, and electromagnetic properties.
• Evaluation of EMA performance, thermal insulation, and flame retardancy.
• Investigation of stimuli-responsive behavior under acidic/alkaline conditions.

Main Results:

• Optimized CNC/PANI aerogel achieved reflection loss of -47.9 dB and an effective absorption bandwidth of 7.9 GHz.
• The helical porous architecture and conductive networks enhanced EMA via multiple scattering, interfacial polarization, and chiral-induced cross-polarization.
• The aerogel demonstrated good thermal insulation and flame retardancy.
• Reversible switching between conductive and insulating states allowed tunable EMA performance.

Conclusions:

• Bioderived chiral aerogels offer superior, tunable EMA properties.
• The developed materials exhibit multifunctional characteristics including thermal insulation and flame retardancy.
• Stimuli-responsive modulation of EMA performance opens new possibilities for adaptive electromagnetic applications.