二氧化钛<sub> 2</sub与由软化学法合成的超疏水性和高IR反射属性>涂覆的空心玻璃微球
Summary
This manuscript proposes a soft-chemistry method to synthesize superhydrophobic, TiO2-coated hollow glass microspheres (HGM) with high IR-reflective properties.
Abstract
这个手稿提出了一种软的化学方法来开发超疏水和高度反射IR的中空玻璃微球（HGM）。锐钛矿TiO 2和超疏水试剂在一个步骤中被涂覆在HGM表面上。 TBT和PFOTES被选定为分别将Ti源和所述超疏水性剂，。他们都涂覆在HGM，和水热工艺之后，TBT转向锐钛矿TiO 2的。以这种方式，一个PFOTES / TiO 2的涂覆的HGM（MCHGM）中的溶液制备。为了进行比较，PFOTES单面涂布HGM（F-SCHGM）和TiO 2单面涂布HGM（TI-SCHGM）的合成，以及。的PFOTES和TiO 2个的涂料HGM表面上是通过X射线衍射（XRD），扫描电子显微镜（SEM）和能量色散检测器（EDS）表征证实。所述MCHGM表现出较高的接触角（153°），但比F-SCHGM下滑动角度（16°），与141.2的接触角6;和滑动的67°角。此外，两个的Ti-SCHGM和MCHGM显示类似IR反射率值，这是比原来的HGM和F-SCHGM高约5.8％。此外，PFOTES涂层几乎没有变化的热传导率。因此，F-SCHGM，用0.0479 W /（米·K）的热导率，是相当像原来HGM，为0.0475 W /（米·K）。 MCHGM和Ti-SCHGM也相似。其热导率值分别为0.0543 W /（米·K）和0.0543 W /（米·K），分别。将TiO 2涂层稍微增加的热导率，但与反射率的增加，总的热绝缘性能增强。最后，由于IR反射特性由HGM涂层提供，如果该涂层被弄脏时，反射率降低。因此，具有超疏水涂层，所述表面被保护免受污染，并且其寿命也延长。
Introduction
中空玻璃微球（HGM）是尺寸范围从10至100微米的无机材料。他们证明了许多有用的特性，如优良的分散性，高流动性，低的密度，和优异的热绝缘性质1，2，3，4。由于它们的中空结构的，HGM具有极低的热导率10，11。由于这些原因，它们在许多领域得到应用，包括航空航天工程5，深海勘探6,7，储氢8， 图9， 等等 。然而，它们仍表现出一些缺点，如低的强度。此外，IR光能够通过HGM以发送和后面加热的主题。为此即，在HGM表面改性是必不可少的减少辐射的热传递。一种有效的方法是涂覆一个IR阻挡材料涂敷到表面HGM。作为半导体，TiO 2的已经在许多领域，如光催化12， 图13，太阳能电池的开发，制造传感器14，环境应用15，并且能量存储16中使用。此外，它也示出了在可见光和红外光带17，18，19低发射率。因此，对我们而言， 二氧化钛是一种谨慎的选择，由于其相对较低的价格和较高的性能。
然而，涂层是很容易的污染物犯规，这严重影响了二氧化钛的反射率。反射率要逐步缩小。因此，SELF-清洁涂层是必不可少的，以防止从结垢涂层并延长这种涂层的工作时间。
在该手稿，使用软化学方法来开发超疏水的TiO 2涂覆的HGM。钛酸四丁酯（TBT）和1H，1H，2H，2H- perfluorooctyltriethoxysilane（PFOTES）被选定为分别将Ti源和超疏水性剂，。他们被水解并沉积在HGM表面上。然后，在水热工艺之后，锐钛矿型的TiO 2形成的HGM表面上，并且所述超疏水性依然存在。为了进行比较，PFOTES单面涂布HGM（F-SCHGM）和TiO 2单面涂布HGM（TI-SCHGM）的合成，以及。合成方案示于图1。
Protocol
Representative Results
Discussion
在该手稿，在协议的关键步骤是在水热过程。它影响的TiO 2的形成，最终的反射率，和超疏水性。温度控制和反应时间也相当显著。如果反应条件发生变化，最终产品可以是有缺陷的。
此方法提供了一种简单的方法来合成超疏水和高度反射IR的HGM中的一个步骤。在以前的研究中，超疏水性和反射性通过单独的装置28，29，…
Divulgazioni
The authors have nothing to disclose.
Acknowledgements
在本文介绍的工作是从CII-HK /香港理工大学创新基金的资助。进一步支持由深圳孔雀计划（KQTD2015071616442225）和中国政府的“千人”计划（Y62HB31601）提供。此外，从应用生物系化工科技香港理工大学和香港理工大学研究院城市可持续发展（RISUD）的帮助表示赞赏。
Materials
| HGM | Technical Institute of Physics and Chemistry, Chinese Academy of Science | N/A | N/A |
| TBT | Sigma-Aldrich | CAS#: 5593-70-4 | Analytical grade |
| Ethyl Alcohol | Sigma-Aldrich | CAS#: 64-17-5 | Analytical grade |
| PFOTES | Sigma-Aldrich | CAS#: 51851-37-7 | 98% |
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