Simple and low cost fabrication of large area nanocoatings with mechanical robustness, enhanced broadband transmittance and antifogging
Simple and low cost fabrication of large area nanocoatings with mechanical robustness, enhanced broadband transmittance and antifogging
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DOI：
10.1016/j.colsurfa.2021.127522
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Dongdong Wang;Yansheng Li;Y. Wen;Xiaoyu Li;Xin Du
中科院分区：
文献类型：
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作者：
Dongdong Wang;Yansheng Li;Y. Wen;Xiaoyu Li;Xin Du
具有机械强度、高宽带透射率和防雾性的大面积纳米涂层在商业和工业应用中具有很高的需求。然而，到目前为止，由于技术上的挑战，制备具有多种功能的先进纳米涂层仍然非常困难。在这项工作中，我们成功地开发了一个惊人的溶胶-凝胶混合悬浮液组成的酸催化的硅溶胶（ACSS）和碱催化的固体二氧化硅纳米粒子（SSN），以实现方便，成本效益高，大面积和基板通用的制造机械坚固的纳米涂层，增强了宽带透射率和防雾通过简单的浸涂或喷涂方法没有任何后处理。值得注意的是，ACSS的加入在多功能纳米涂层的形成中起着关键作用。它不仅使SSN交联以形成三维网络结构以增强机械稳定性（3 H铅笔划痕测试）、改进的粘附性（胶带粘附性测试的4 B级）和对水流冲击的高抗性，而且还保持纳米涂层的足够孔隙率和表面粗糙度以增强透射率（在517 nm波长下为97.6%，约为100 nm）。在400-1100 nm范围内平均透射率增加5.0%）和亲水性（铺展0.5 s后的水接触角：6.8°）防雾。此外，研制的悬浮液不仅适用于有机玻璃、太阳能电池板载玻片等不同的基板，而且适用于90 cm × 160 cm的大面积。由于这种纳米涂层的简单，成本效益高，大面积和基底通用的制造，它具有很大的潜力推向市场。
The large area nanocoatings with mechanical robustness, high broadband transmittance and antifogging are highly in demand for commercial and industry applications. However, up to now, it is still very difficult to fabricate the advanced nanocoatings with multiple functions owing to technical challenge. In this work, we successfully developed an amazing sol-gel mixed suspension composed of acid-catalyzed silica sol (ACSS) and base-catalyzed solid silica nanoparticles (SSNs) to achieve the facile, cost-efficient, large area and substrate-versatile fabrication of mechanically robust nanocoatings with enhanced broadband transmittance and antifogging via simple dip-coating or spray-coating method without any post-treatments. Noteworthily, the addition of ACSS plays a key role in the formation of multifunctional nanocoatings. It not only crosslinks the SSNs to form three-dimensional network structure for enhanced mechanical stability (3 H pencil scratching test), improved adhesion (class of 4B for tape adhesion test), and high resistance to the impact of water flow, but also maintains enough porosity and surface roughness of nanocoatings for enhanced transmittance (97.6% at the wavelength of 517 nm, and ca. 5.0% increase of mean transmittance in the 400–1100 nm) and hydrophilic (water contact angles after 0.5 s of spreading: ca. 6.8°) antifogging. Moreover, the developed suspension not only can be applicable to different substrates such as organic glass and solar panel glass slide, but also can be fit for large area of 90 cm * 160 cm. Due to simple, cost-efficient, large area and substrate-versatile fabrication of such nanocoatings, it has great potential to be pushed into the markets.