Amphiphobic Nanofibrous Silica Mats with Flexible and High-Heat-Resistant Properties
Amphiphobic Nanofibrous Silica Mats with Flexible and High-Heat-Resistant Properties
复制标题
具有柔韧和高耐热性能的两疏纳米纤维二氧化硅垫
DOI：
10.1021/jp909672r
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发表时间：
2010-01-21
影响因子：
3.7
通讯作者：
Wang, Moran
中科院分区：
文献类型：
--
作者：
Guo, Meng;Ding, Bin;Wang, Moran
在这项研究中，我们首次通过对电纺纯二氧化硅纳米纤维垫进行（氟烷基）硅烷（FAS）改性，制备了柔性、高耐热且两亲性的垫子。无机二氧化硅纳米纤维垫是通过电纺聚乙烯醇（PVA）和硅胶的混合溶液，然后煅烧去除有机成分而获得的。发现PVA/二氧化硅和二氧化硅纤维随机取向形成纤维直径在150 - 500纳米范围内的非织造垫子。经过FAS改性后，二氧化硅垫子的表面润湿性从两亲性转变为两亲性。具有串珠结构的氟化垫子显示出最高的水接触角（WCA）为154度，油接触角（OCA）为144度。此外，氟化无机纤维垫子表现出高耐热性；即使在450℃下退火处理30分钟后，它们仍保持其疏水性（WCA为138度）和疏油性（OCA为132度）。氟化纤维垫子的潜在应用包括高温过滤、选择性过滤和自清洁涂层。
In this study, for the first time, we fabricated flexible, high-heat-resistant, and amphiphobic mats by (fluoroalkyl)silane (FAS) modification of electrospun pure silica nanofibrous mats. The inorganic silica nanofibrous mats were obtained via electrospinning the blend solutions of poly(vinyl alcohol) (PVA) and silica gel, followed by calcination to remove the organic component. The PVA/silica and silica fibers were found to be randomly oriented as nonwoven mats with fiber diameters in the range of 150−500 nm. After the FAS modification, the surface wettability of the silica mats was converted from amphiphilic to amphiphobic. The fluorinated mat with the bead-on-string structure showed the highest water contact angle (WCA) of 154° and oil contact angle (OCA) of 144°. Additionally, the fluorinated inorganic fibrous mats exhibited a high heat resistance; they kept their hydrophobicity (WCA of 138°) and oleophobicity (OCA of 132°) even after the annealing treatment at 450 °C for 30 min. Potential application...