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首页> 外文期刊>Advanced Functional Materials >Cellulose Silica Hybrid Nanofiber Aerogels: From Sol-Gel Electrospun Nanofibers to Multifunctional Aerogels
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Cellulose Silica Hybrid Nanofiber Aerogels: From Sol-Gel Electrospun Nanofibers to Multifunctional Aerogels

机译：纤维素二氧化硅杂化纳米纤维气凝胶：从溶胶凝胶电纺纳米纤维到多功能气凝胶

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摘要

Aerogels are considered ideal candidates for various applications, because of their low bulk density, highly porous nature, and functional performance. However, the time intensive nature of the complex fabrication process limits their potential application in various fields. Recently, incorporation of a fibrous network has resulted in production of aerogels with improved properties and functionalities. A facile approach is presented to fabricate hybrid sol-gel electrospun silica-cellulose diacetate (CDA)-based nanofibers to generate thermally and mechanically stable nanofiber aerogels. Thermal treatment results in gluing the silica-CDA network strongly together thereby enhancing aerogel mechanical stability and hydrophobicity without compromising their highly porous nature (>98%) and low bulk density (approximate to 10 mg cm(-3)). X-ray photoelectron spectroscopy and in situ Fourier-transform infrared studies demonstrate the development of strong bonds between silica and the CDA network, which result in the fabrication of cross-linked structure responsible for their mechanical and thermal robustness and enhanced affinity for oils. Superhydrophobic nature and high oleophilicity of the hybrid aerogels enable them to be ideal candidates for oil spill cleaning, while their flame retardancy and low thermal conductivity can be explored in various applications requiring stability at high temperatures.
机译：气凝胶因其低堆积密度，高度多孔性和功能性能而被认为是各种应用的理想选择。然而，复杂制造过程的时间密集性限制了它们在各个领域的潜在应用。最近，掺入纤维网络已导致生产具有改善的性能和功能的气凝胶。提出了一种简便的方法来制造混合溶胶-凝胶电纺二氧化硅-纤维素二乙酸酯（CDA）基纳米纤维，以产生热稳定和机械稳定的纳米纤维气凝胶。热处理可将二氧化硅-CDA网络牢固地粘合在一起，从而增强气凝胶的机械稳定性和疏水性，而不会损害其高多孔性（> 98％）和低堆积密度（约10 mg cm（-3））。 X射线光电子能谱和原位傅里叶变换红外研究表明，二氧化硅与CDA网络之间形成了牢固的键，从而导致形成了交联结构，从而使其具有机械和热稳定性，并增强了对油的亲和力。混合气凝胶的超疏水性和高亲油性使其成为溢油清洁的理想选择，而它们的阻燃性和低导热性可以在需要高温下稳定性的各种应用中探索。

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