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当前位置: 首页 > 文章 > 液氮冷冻干燥法制备纳米纤维素气凝胶 林业工程学报 2017 (4) 109-114
Position: Home > Articles > Fabrication of nano-cellulose aerogels by drying liquid nitrogen freeze Journal of Forestry Engineering 2017 (4) 109-114

液氮冷冻干燥法制备纳米纤维素气凝胶

作  者：
赵华;张洋;王晓宇;宋宇轩
单  位：
南京林业大学材料科学与工程学院
关键词：
气凝胶;叔丁醇;液氮;冷冻干燥;纳米纤维素
摘  要：
纤维素气凝胶被誉为继有机气凝胶和无机气凝胶之后的新一代气凝胶,是新生的第三代材料,在吸附材料等领域具有广阔的应用前景。笔者先以微晶纤维素(MCC)为原料经硫酸水解法制得纳米纤维素(NCC),再通过无机盐溶液物理凝胶成型法、叔丁醇置换和液氮冷冻干燥制备球形纤维素气凝胶。利用场发射扫描电子显微镜(SEM)、万能力学试验机、热重分析仪、全自动比表面积及孔隙分析仪对所制备的纳米纤维素气凝胶的力学性能、微观形貌、比表面积、孔径分布及热稳定性进行表征分析。结果表明,液氮冷冻干燥法制备的球形纳米纤维素气凝胶主要为疏松多孔的三维层状结构同时存在少量三维网络结构,其比表面积在104.07~164.97 cm~2/g之间,孔径主要分布在10~25 nm内;纳米纤维素气凝胶的力学性能、压缩强度、密度随着纳米纤维素质量分数的增加而变大;纳米纤维素气凝胶的热稳定性与微晶纤维素和纳米纤维素相似。
译  名：
Fabrication of nano-cellulose aerogels by drying liquid nitrogen freeze
作  者：
ZHAO Hua;ZHANG Yang;WANG Xiaoyu;SONG Yuxuan;College of Materials Science and Engineering,Nanjing Forestry University;
关键词：
aerogel;;tert-butyl alcohol;;liquid nitrogen;;freeze-drying;;nano-cellulose
摘  要：
Cellulose aerogel is known as the third generation of aerogel following organic and inorganic aerogel and has broad applications in the field of adsorption materials. In this paper,sulfuric acid hydrolysis method was adopted to prepare nano-cellulose. The spherical nano-cellulose aerogel prepared with physical gelmolding in inorganic salt solution followed by freeze-dried had large effective adsorption areas. The microstructure,specific surface area,mechanical property,pore size distribution as well as the thermal degradation properties of the prepared aerogel were analyzed via scanning electron microscope( SEM),a universal testing machine,a thermo gravietric analyzer and a micrometrics analyzer. The results showed that the microstructure and specific surface areas of cellulose aerogel prepared by freezedrying are mainly of three-dimensional layered structure and a small amount of three-dimensional network. The structures exhibited a specific surface areas ranged from 104. 07 to 164. 97 m~2/g with a pore size of 10-25 nm. The isotherm adsorption-desorption curves for nano-cellulose aerogels were of Type II and is given priority to multilayer adsorption. The hysteresis loop in the high pressure of isotherm adsorption-desorption curves indicated that it has abundant pore structure; The pore size distributions of the nano-cellulose aerogel indicated the apertures are majorly mesoporous; The mechanical properties,compressive intensity and density of the aerogel increased with the increasing of cellulose concentration. With the increase of fiber mass fraction,the adsorption quantity,specific surface area and porosity of nano-cellulose aerogel increased. The nano-cellulose aerogel showed a similar thermal degradation behavior as those of microcrystalline cellulose( MCC) and nanocrystal cellulose( NCC).

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