Lignocellulose/nanoparticle/polymer composites from pectin production residues for EMI shielding and flexible electronics

Overview

This technology transforms pectin production residues—an abundant agro-industrial byproduct—into high-value multifunctional composite materials. Using environmentally friendly extraction and fractionation processes based on deep eutectic solvents (DES/NADES) combined with hydrothermal methods, lignocellulosic components are isolated from the waste stream and functionalized with 2D, metal oxide, or carbon-based nanoparticles. The resulting materials are incorporated into polymer matrices to produce films, aerogels, and foams with tailored functional properties.

The approach directly addresses the global shift away from fossil-based resources by valorizing food-processing waste into advanced materials. Applications span electromagnetic interference (EMI) shielding in the X-band (8–12 GHz), flexible electronic devices, filtration membranes, sustainable packaging, and 3D-printable composite filaments. By converting a low-value residue into high-performance materials, this technology supports circular economy objectives while reducing the environmental footprint of functional material production.

Technical specifications

Key features:

• Green fractionation of lignocellulosic biomass using DES/NADES combined with hydrothermal processing, designed to minimize energy, water, and chemical consumption
• Functionalization with 2D, metal oxide, and/or carbon-based nanoparticles to impart electrical conductivity, dielectric properties, and EMI shielding effectiveness
• Multiple material formats: transparent and translucent films, aerogels, and foams
• Compatibility with polymer matrices for tunable composite formulations
• Demonstrated proof of concept in X-band (8–12 GHz) EMI shielding and flexible electronic applications using wood-based biomass residues as feedstock
• Process designed to be transferable from wood residues to pectin production residues with optimization

Development roadmap (36 months):

• Characterization of pectin production residues and optimization of green extraction (months 1–6)
• Isolation and characterization of lignocellulose-rich fractions (months 7–12)
• Production of nano/microstructured materials and nanoparticle functionalization (months 13–18)
• Composite formulation and optimization (months 19–24)
• Application-specific prototypes: EMI shielding, flexible electronics, membranes, packaging, and 3D printing (months 25–30)
• Performance validation, sustainability and scalability assessment, and industrial implementation roadmap (months 31–36)

Technology readiness level

The core technology is at an early-to-mid development stage. Experimental proof of concept has been demonstrated using wood-based biomass residues within the framework of COST Action CA21159 (PhoBioS), confirming the viability of multifunctional conductive hybrid materials for EMI shielding and flexible electronics. The proposed 36-month program will transfer this validated approach to pectin production residues, progressing through material development, prototype production, and industrial scalability assessment, targeting completion of pilot demonstrations and an implementation-ready roadmap.