In situ lignin modification toward photonic wood
Advanced Materials, 2021•Wiley Online Library
Lignin serves as a binder that forms strong matrices of the cell walls of wood. However, it
has many photolabile chromophore groups that create a monotonic brownish color and
make wood susceptible to photodegradation. Herein, a new strategy is reported for
modifying lignin using an in situ, rapid, and scalable process that involves the photocatalytic
oxidation of native lignin in wood by H2O2 and UV light. The reaction selectively eliminates
lignin's chromophores while leaving the aromatic skeleton intact, thus modulating the optical …
has many photolabile chromophore groups that create a monotonic brownish color and
make wood susceptible to photodegradation. Herein, a new strategy is reported for
modifying lignin using an in situ, rapid, and scalable process that involves the photocatalytic
oxidation of native lignin in wood by H2O2 and UV light. The reaction selectively eliminates
lignin's chromophores while leaving the aromatic skeleton intact, thus modulating the optical …
Abstract
Lignin serves as a binder that forms strong matrices of the cell walls of wood. However, it has many photolabile chromophore groups that create a monotonic brownish color and make wood susceptible to photodegradation. Herein, a new strategy is reported for modifying lignin using an in situ, rapid, and scalable process that involves the photocatalytic oxidation of native lignin in wood by H2O2 and UV light. The reaction selectively eliminates lignin's chromophores while leaving the aromatic skeleton intact, thus modulating the optical properties of wood. The resulting “photonic wood” retains ≈80% of its original lignin content, which continues to serve as a strong binder and water‐proofing agent. As a result, photonic wood features a much higher mechanical strength in a wet environment (20‐times higher tensile strength and 12‐times greater compression resistance), significant scalability (≈2 m long sample), and largely reduced processing times (1–6.5 h vs 4–14 h) compared with delignification methods. Additionally, this in situ lignin‐modified wood structure is easily patterned through a photocatalytic oxidation process. This photocatalytic production of photonic wood paves the way for the large‐scale manufacturing of sustainable biosourced functional materials for a range of applications, including energy‐efficient buildings, optical management, and fluidic, ionic, electronic, and optical devices.
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