Preparation and properties of cellulose nanocrystals: Rods, spheres, and network
Preparation and properties of cellulose nanocrystals: Rods, spheres, and network
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DOI：
10.1016/j.carbpol.2010.04.073
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发表时间：
2010-09-05
影响因子：
11.2
通讯作者：
Hsieh, You-Lo
中科院分区：
文献类型：
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作者：
Lu, Ping;Hsieh, You-Lo
以棉纤维为原料，采用酸解和冷冻干燥法制备了棒状、球状和网状结构的纤维素纳米晶。用硫酸进行水解，在这些纳米晶体表面引入硫酸盐基团，使其在几秒钟内分散在水和有机介质中，包括乙醇和N，N-二甲基甲酰胺。另一方面，冷冻干燥产生了中孔(91.99+/-2.57埃平均孔宽)，显著提高了比表面积(13.362 m(2)/g)，约为原纤维素(1.547 m(2)/g)的9倍。此外，纳米晶表现出更好的导热性和相当高的碳质残留量(近30%)，这可能是由于直接固相到气相的分解。这些结果表明，表面电荷引入和介孔固定相结合的方法是制备大量具有快速再分散能力的高质量纤维素纳米晶的有效途径。(C)2010爱思唯尔有限公司。保留所有权利。
Cellulose nanocrystals with rod, sphere, and network morphologies were prepared by acid hydrolysis of cotton cellulose, followed by freeze-drying. Hydrolysis with sulfuric acid introduced sulfate groups to these nanocrystal surfaces permitting their dispersion in aqueous as well as organic media, including ethanol and N,N-dimethylformamide, in a matter of seconds. Freeze-drying, on the other hand, induced mesoporosity (91.99 +/- 2.57 angstrom average pore width) and significantly improved specific surface (13.362 m(2)/g) that is about 9 times of the original cellulose (1.547 m(2)/g). Moreover, the nanocrystals exhibited improved thermal conductivity and considerably higher (nearly 30%) carbonaceous residue, possibly due to direct solid-to-gas decomposition. These results demonstrated that a combination of surface charge introduction and fixation of mesoporosity in cellulose nanocrystals is an efficient route to prepare large quantity of high quality cellulose nanocrystals with quick re-dispersion capability for practical applications. (C) 2010 Elsevier Ltd. All rights reserved.