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Wood Nanotechnologies towards Multi-Functional Transparent Wood
Yuanyuan Li1,Sergei Popov1,Ilya Sychugov1,Min Yan1,Lars Berglund1
KTH Royal Inst of Technology1
Transparent wood is an emerging material with the combination of optical functions and mechanical performances, showing promising prospect in energy-saving buildings, smart windows, and photonics applications.  Transparent wood is usually prepared by removing the light-absorbing components followed by successful impregnation with a refractive-index-matching polymer such as polymethyl methacrylate (PMMA).– During the process, the hierarchical wood structure is preserved. The synergy between wood and PMMA is observed for mechanical properties. Optical properties of TW are tunable via control of the fabrication process and doping the host wood matrix with various additives. Wood nanotechnology is an efficient approach to fabricate multi-functional transparent wood. Through wood-PMMA interface modulation, transparent wood with superior high transmittance and low haze is obtained, paving the way for centimeter thick transparent wood preparation. Wood cell wall modification with organic dye Rhodamine 6G (Rh6G) before PMMA infiltration results in luminescent transparent wood. Lasing effect was observed with the dye modified transparent wood, extending the application of transparent wood in the photonic area. By incorporating functional particles or polymers into the wood structure, hybrid transparent wood materials could be obtained, such as luminescent transparent wood, thermal energy storage transparent wood etc., 
 Y. Li, E. Vasileva, I. Sychugov, S. Popov, and L. Berglund, “Optically Transparent Wood: Recent Progress, Opportunities, and Challenges,” Adv. Opt. Mater., vol. 6, no. 14, p. 1800059, Jul. 2018.
 Y. Li, Q. Fu, S. Yu, M. Yan, and L. Berglund, “Optically Transparent Wood from a Nanoporous Cellulosic Template: Combining Functional and Structural Performance,” Biomacromolecules, vol. 17, no. 4, pp. 1358–1364, Apr. 2016.
 M. Zhu, J. Song, T. Li, A. Gong, Y. Wang, J. Dai, Y. Yao, W. Luo, D. Henderson, and L. Hu, “Highly Anisotropic, Highly Transparent Wood Composites,” Adv. Mater., vol. 28, no. 26, pp. 5181–5187, Jul. 2016.
 S. Fink, “Transparent Wood - a New Approach in the Functional-Study of Wood Structure,” Holzforschung., vol. 46, no. 5, pp. 403–408, 1992.
 Y. Li, X. Yang, Q. Fu, R. Rojas, M. Yan, and L. A. Berglund, “Towards centimeter thick transparent wood through interface manipulation,” J. Mater. Chem. A, vol. 6, no. 3, pp. 1094–1101, 2017.
 E. Vasileva, Y. Li, I. Sychugov, M. Mensi, L. Berglund, and S. Popov, “Lasing from Organic Dye Molecules Embedded in Transparent Wood,” Adv. Opt. Mater., vol. 5, no. 10, p. 1700057, 2017.
 Y. Li, S. Yu, J. G. C. Veinot, J. Linnros, L. Berglund, and I. Sychugov, “Luminescent Transparent Wood,” Adv. Opt. Mater., vol. 5, no. 1, p. 1600834, Jan. 2017.
 C. Montanari, Y. Li, H. Chen, M. Yan, and L. A. Berglund, “Transparent Wood for Thermal Energy Storage and Reversible Optical Transmittance,” ACS Appl. Mater. Interfaces, p. acsami.9b05525, May 2019.