Wang Xuan, Shan Shuya, Shi Sheldon Q, Zhang Yaoli, Cai Liping, Smith Lee M
Department of Mechanical Engineering, University of North Texas, Denton, Texas 76203, United States.
Department of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, P. R. China.
ACS Appl Mater Interfaces. 2021 Jan 13;13(1):1662-1669. doi: 10.1021/acsami.0c21245. Epub 2020 Dec 30.
The objective of this study is to convert bamboo into a transparent material with great optical transmittance and good strength. Bamboo has a much faster regeneration rate than wood, but its high density and high extractive content make it challenging to produce transparent products. This study presents a simple and effective approach that could address this challenge. Pretreatment of bamboo with low concentration sodium hydroxide greatly improved the preparation efficiency of transparent bamboo. The transparent bamboo with a thickness of 1 mm and cellulose volume fraction of 22% made from the pretreated bamboo exhibited an improved total optical transmissivity up to 80%, which was 60% higher than that of untreated bamboo. Compared to transparent wood (TW), although the transmissivity of transparent bamboo was slightly lower, its mechanical strength was almost doubled. Besides, the developed transparent bamboo exhibited a low heat conductivity of 0.203 W m K, being about 10% lower than that of TW (0.225 W m K) and approximately 80% lower than that of common glass material (0.974 W m K). The transparent bamboo would significantly enhance energy-saving performance, being a promising alternative to traditional glass.
本研究的目的是将竹子转化为具有高透光率和良好强度的透明材料。竹子的再生速度比木材快得多，但其高密度和高提取物含量使其难以生产透明产品。本研究提出了一种简单有效的方法来应对这一挑战。用低浓度氢氧化钠对竹子进行预处理大大提高了透明竹的制备效率。由预处理竹子制成的厚度为1毫米、纤维素体积分数为22%的透明竹的总透光率提高到了80%，比未处理竹子高60%。与透明木材（TW）相比，虽然透明竹的透光率略低，但其机械强度几乎提高了一倍。此外，所制备的透明竹的热导率为0.203W m K，比TW（0.225W m K）低约10%，比普通玻璃材料（0.974W m K）低约80%。透明竹将显著提高节能性能，是传统玻璃的一个有前景的替代品。
