Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China.
Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
Carbohydr Polym. 2015 Mar 15;118:115-8. doi: 10.1016/j.carbpol.2014.11.010. Epub 2014 Nov 16.
In this paper, we reported miscellaneous carbon aerogels prepared by pyrolysis of regenerated cellulose aerogels that were fabricated by dissolution in a mild NaOH/PEG solution, freeze-thaw treatment, regeneration, and freeze drying. The as-prepared carbon aerogels were subsequently characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), nitrogen adsorption measurements, X-ray diffraction (XRD), Raman spectroscopy, and water contact angle (WCA) tests. The results showed that the carbon aerogels with pore diameters of 1-60 nm maintained interconnected three-dimensional (3D) network after the pyrolysis, and showed type-IV adsorption isotherm. The pyrolysis process leaded to the decomposition of oxygen-containing functional groups, the destruction of cellulose crystalline structure, and the formation of highly disordered amorphous graphite. Moreover, the carbon aerogels also had strong hydrophobicity, electrical conductivity and flame retardance, which held great potential in the fields of waterproof, electronic devices and fireproofing.
本文报道了通过在温和的 NaOH/PEG 溶液中溶解、冷冻-解冻处理、再生和冷冻干燥来制备再生纤维素气凝胶，然后通过热解制备的各种碳气凝胶。所制备的碳气凝胶随后通过扫描电子显微镜 (SEM)、能谱 (EDX)、氮气吸附测量、X 射线衍射 (XRD)、拉曼光谱和水接触角 (WCA) 测试进行了表征。结果表明，在热解后，具有 1-60nm 孔径的碳气凝胶保持了相互连接的三维 (3D) 网络，并表现出 IV 型吸附等温线。热解过程导致含氧官能团的分解、纤维素结晶结构的破坏和高度无序无定形石墨的形成。此外，碳气凝胶还具有很强的疏水性、导电性和阻燃性，在防水、电子设备和防火等领域具有巨大的应用潜力。
