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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

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Thermochromic Nanocellulose Films for Temperature-Adaptive Passive Cooling.

Aayush Kumar Jaiswal¹, Ari Hokkanen², Sergei Khakalo^3,4

¹Biomaterial Processing and Products, VTT Technical Research Centre of Finland Ltd., Tietotie 4E, 02044 Espoo, Finland.

ACS Applied Materials & Interfaces

|March 14, 2024

Summary

Researchers developed adaptive cellulose nanofibril (CNF) films using thermochromic materials for passive cooling. These green films offer significant cooling potential, reducing energy needs and climate impact.

Keywords:

cellulose films and coatings nanocellulose passive cooling thermochromic

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Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

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Area of Science:

Materials Science
Sustainable Energy
Nanotechnology

Background:

Energy efficiency in buildings is crucial for sustainability and cost savings.
Passive cooling methods offer a promising alternative to active cooling systems.
Sustainable materials are needed for advanced passive radiative cooling solutions.

Purpose of the Study:

To develop adaptive passive cooling films using cellulose nanofibrils (CNF) and thermochromic (TC) materials.
To explore the potential of hybrid CNF films for temperature-dependent thermal regulation.
To investigate the application of these materials in enhancing energy efficiency in habitation spaces.

Main Methods:

Hybrid films were fabricated by doping CNF with black-to-leuco TC particles.
A thin silver layer was optionally applied to the films for enhanced performance.
Optical properties, transition temperatures, and cooling potential were measured.
Outdoor field testing and simulation modeling were conducted.

Main Results:

The hybrid CNF films exhibited rapid optical property transitions at ~22 °C within 1 second.
Visible light transmittance ranged from 60-90%, with significant mid-infrared (MIR) absorption (8-13 μm).
Cooling potentials of 1-4 °C (without silver) and ~10 °C (with silver) were achieved, with a peak of 12 °C in outdoor tests.

Conclusions:

The developed thermochromic CNF films demonstrate effective adaptive thermal regulation for passive cooling.
This technology offers a novel application for green cellulose-based materials in energy-efficient building solutions.
The concept is applicable to standalone films and glass coatings, extending its potential impact.