Charge Regulated Diffusion of Silica Nanoparticles into Wood for Flame Retardant Transparent Wood. (27th January 2022)

• Record Type: Journal Article
• Authors: Samanta, Archana; Höglund, Martin; Samanta, Pratick; Popov, Sergei; Sychugov, Ilya; Maddalena, Lorenza; Carosio, Federico; Berglund, Lars A.
• Is Part Of: Advanced sustainable systems. Volume 6:Number 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-27
• Subjects: biocomposites -- charge density -- flame retardant -- silica -- transparent wood; Sustainable living -- Periodicals; Sustainability -- Periodicals; Green technology -- Periodicals; Periodicals; 628
• DOI: 10.1002/adsu.202100354
• Languages: English
• ISSNs: 2366-7486

Abstract

Abstract: The preparation of wood substrates modified by charged inorganic nanoparticles (NPs) diffusing into the internal cell wall structure is investigated for generating functional properties. The flammability problem of wood biocomposites is addressed. NPs applied from colloidal sols carry charge to stabilize them against aggregation. The influence of charge on particle diffusion and adsorption should play a role for their spatial distribution and localization in the wood substrate biocomposite. It is hypothesized that improved dispersion, infiltration, and stability of NPs into the wood structure can be achieved by charge control diffusion, also restricting NP agglomeration and limiting distribution to the wood cell wall. Cationic and anionic silica NPs of ≈30 nm are therefore allowed to diffuse into bleached wood. The influence of charge on distribution in wood is investigated as a function of initial sol concentration. Transparent wood is fabricated by in situ polymerization of a thiol‐ene in the wood pore space. These biocomposites demonstrate excellent flame retardancy with self‐extinguishing characteristics. The approach has potential for commercial fabrication of flame retardant transparent composites for glazing and other building applications. Abstract : Controlled electrostatic interactions help to achieve homogeneous silica distribution throughout the bulk of a wood based structure. This uniform silica‐rich surface layer protects the wood composite against thermal degradation. This research elucidates a straightforward technique for impregnating commercially available functional colloids into hierarchical wood structures without chemical modifications, and directs a path for commercial fabrication of functional wood biocomposites.