Growth of high-density ZnO nanorods on wood with enhanced photostability, flame retardancy and water repellency
Growth of high-density ZnO nanorods on wood with enhanced photostability, flame retardancy and water repellency
复制标题
在木材上生长高密度氧化锌纳米棒，增强光稳定性、阻燃性和防水性
DOI：
10.1016/j.apsusc.2017.02.252
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发表时间：
2017-06-15
影响因子：
6.7
通讯作者：
Wang, Xiaoqing
中科院分区：
文献类型：
--
作者：
Kong, Lizhuo;Tu, Kunkun;Wang, Xiaoqing
氧化锌（ZnO）纳米棒阵列成功地组装在木材表面原位通过两个步骤的过程，包括形成的ZnO种子和随后的晶体生长在低温水热条件下。通过场发射扫描电子显微镜（FE-SEM）和X射线衍射（XRD）对所制备的ZnO纳米棒的形貌和晶体结构进行了研究。通过调节水热处理过程中ZnO生长溶液的浓度，在木材表面生成了高度致密、均匀的ZnO纳米棒阵列。加速老化试验表明，组装的ZnO纳米棒阵列对紫外线辐射具有高度的保护作用，大大提高了涂层木材的光稳定性。同时，ZnO纳米棒涂层的木材可以承受持续暴露于火焰中，只有轻微的阴燃，而原始木材容易着火并迅速燃烧。此外，当用低表面能硬脂酸进一步改性时，ZnO纳米棒修饰的木材表面可以转变为超疏水表面，水接触角（CA）接近154。这种ZnO纳米棒改性木材具有增强的光稳定性，阻燃性和防水性，为传统的木材防腐策略提供了一种有趣的替代方案，突出了它们在一些新型木材产品中的潜在应用。(C)2017爱思唯尔B. V.保留所有权利。
Zinc oxide (ZnO) nanorod arrays were successfully assembled on the wood surface in situ via a two-step process consisting of formation of ZnO seeds and subsequent crystal growth under hydrothermal conditions at a low temperature. The morphology and crystalline structure of the formed ZnO nanorods were studied by field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). Highly dense and uniform arrays of ZnO nanorods with well-defined hexagonal facets were generated on the wood surface by tuning the concentration of the ZnO growth solution during the hydrothermal treatment. Accelerated weathering tests indicated that the assembled ZnO nanorod arrays were highly protective against UV radiation and greatly enhanced the photostability of the coated wood. Meanwhile, the ZnO nanorod-coated wood can withstand continuous exposure to flame with only minor smoldering in contrast with the pristine wood catching fire easily and burning rapidly. Moreover, when further modified with low-surface-energy stearic acid, the ZnO nanorod decorated wood surface can be transformed into a superhydrophobic surface, with a water contact angle (CA) of similar to 154. Such ZnO nanorod-modified woods with enhanced photostability, flame retardancy and water repellency offer an interesting alternative to conventional wood preservation strategies, highlighting their potential applications in some novel wood products. (C) 2017 Elsevier B.V. All rights reserved.