桉木浆纤维多孔结构的分形分析  

Fractal Analysis of Pore Structure of Eucalyptus Pulp Fibers

作　　者：郭文杰[1] 万金泉[1] 马邕文[1] 王艳[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2009年第12期70-74,80,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"863"计划项目(2007AA03Z433);广东省重点科技攻关项目(2008A0302008);广东省科技计划项目(2008B030302035);广东省节能减排重大专项项目(2008A080800003)

摘　　要：采用原子力显微镜和低温氮吸附法研究了桉木浆纤维的孔隙结构,并运用分形理论对孔隙结构进行了分析.原子力显微镜观察发现桉木浆纤维的多孔结构具有自相似性,可以采用分形理论对其进行研究.低温氮吸附测定发现桉木浆纤维表面密布孔洞,孔隙以中孔为主,平均孔径为4.9 nm,BET比表面积为4.83 m^2/g,总孔容为0.005 8 cm^3/g.对桉木浆纤维多孔结构的分形分析和计算证实了该多孔结构具有分形特征,其分形维数为2.82,说明植物纤维表面较为粗糙,密布孔洞.文中还发现,桉木浆纤维多孔结构的分形维数与保水值等宏观性质有密切的关系。The pore structure of eucalyptus pulp fibers was investigated by means of atomic force microscopy （AFM） and low-temperature nitrogen adsorption. Then, based on the fractal theory, the pore structure was further analyzed. AFM observation indicates that the eucalyptus pulp fibers are of a pore structure with self-similarity, which can be analyzed based on the fractal theory. Low-temperature nitrogen adsorption measurement shows that the fibers are of pore surface, and that the pores are mainly in a mesopore range, with an average size of 4. 9 nm, a BET specific surface area of 4. 83 m2/g and a total pore volume of 0. 005 8 cm3/g. Moreover, fractal analysis and calculation indicate that the pore structure of the fibers is of obvious fractal property in a dimension of 2.82, which means that the fibers are of rough and pore surface. It is also found that the fractal dimension of eucalyptus pulp fibers closely relates to the macroscopic properties such as water retention value.

关 键 词：桉木浆纤维 分形 分形维数 多孔结构 

分 类 号：TS721[轻工技术与工程—制浆造纸工程]