Xu Bingbing, Zhang Qiuhui
MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China.
ACS Omega. 2021 Mar 31;6(14):9764-9770. doi: 10.1021/acsomega.1c00381. eCollection 2021 Apr 13.
As a common inorganic silicon material, nano-SiO is extremely hydrophilic due to the presence of a large number of hydroxyl groups on its surface, which limits its application in some fields. In this research, hexadecyltrimethoxysilane (HDTMS) was used to modify nano-SiO, and the results of water contact angle (WCA), Fourier transform infrared (FTIR), two-dimensional correlation spectroscopy (2D-COS), thermogravimetric (TG) analysis, and scanning electron microscopy (SEM) indicated that the hydrophobic long-chain alkyl of HDTMS was successfully grafted onto the surface of nano-SiO. When the ratio of nano-SiO and HDTMS was 0.25:1, the WCA of nano-SiO modified with HDTMS (HDTMS-nano-SiO) reached 170.9°, which was about 5.62 times higher than that before modification, and the superhydrophobic property was obtained. The novelty of this work lies in the modified nano-SiO with a WCA of over 170° and the analysis of the modification mechanism with the help of 2D-COS. This study can provide a reference for the hydrophobic modification of nano-SiO and its application field expansion.
作为一种常见的无机硅材料，纳米二氧化硅（nano-SiO）由于其表面存在大量羟基而具有极强的亲水性，这限制了它在某些领域的应用。在本研究中，采用十六烷基三甲氧基硅烷（HDTMS）对纳米二氧化硅进行改性，水接触角（WCA）、傅里叶变换红外光谱（FTIR）、二维相关光谱（2D-COS）、热重分析（TG）以及扫描电子显微镜（SEM）的结果表明，HDTMS的疏水长链烷基成功接枝到了纳米二氧化硅表面。当纳米二氧化硅与HDTMS的比例为0.25:1时，用HDTMS改性的纳米二氧化硅（HDTMS-纳米二氧化硅）的水接触角达到170.9°，约为改性前的5.62倍，获得了超疏水性能。这项工作的新颖之处在于改性后的纳米二氧化硅水接触角超过170°，并借助二维相关光谱对改性机理进行了分析。本研究可为纳米二氧化硅的疏水改性及其应用领域拓展提供参考。
