氮气吸附法表征杨木应拉木的孔隙结构

doi:10.11707/j.1001-7488.20111021

林业科学 ›› 2011, Vol. 47 ›› Issue (10): 134-140.doi: 10.11707/j.1001-7488.20111021

氮气吸附法表征杨木应拉木的孔隙结构

苌姗姗¹, 胡进波¹, Clair Bruno², Quignard Françoise³

1. 中南林业科技大学材料科学与技术学院长沙 410004;2. Laboratoire de Mécanique et Génie Civil, Université Montpellier 2 France 34095;3. Institut Charles Gerhardt Montpellier, Université Montpellier 2 France 34296

收稿日期:2010-06-21 修回日期:2010-07-10 出版日期:2011-10-25 发布日期:2011-10-25

Pore Structure Characterization of Poplar Tension Wood by Nitrogen Adsorption-Desorption Method

Chang Shanshan¹, Hu Jinbo¹, Clair Bruno², Quignard Françoise³

1. College of Material Science and Engineering, Central South University of Forestry and Technology Changsha 410004;2. Laboratoire de Mécanique et Génie Civil (LMGC), Université Montpellier 2, Montpellier, 34095, France;3. Institut Charles Gerhardt Montpellier, UMR 5253 Université Montpellier 2, Montpellier, 34296, France

Received:2010-06-21 Revised:2010-07-10 Online:2011-10-25 Published:2011-10-25

摘要/Abstract

摘要：

在常规解剖特征分析的基础上,采用氮气吸附法对杨木应拉木的比表面积及孔径分布等孔结构参数进行研究,并通过解析氮气吸附等温线判断孔隙的形状。结果表明: 杨木应拉木BET比表面积为21.9 m²·g^-1,是对应木的13倍; 杨木应拉木试样具有完好的介孔特征(孔径2~50 nm),并具有一定量的微孔和大孔; 内部存在"墨水瓶"状和狭缝状孔隙,孔径为5 nm的孔体积分布密度最大,孔径在4~7 nm的孔体积占总孔体积的74.4%,孔径超过15 nm的孔体积占总体积的10.8%。杨木应拉木中大量存在的中孔孔隙可归因于应拉木木纤维中的厚壁胶质层。

关键词: 应拉木, 孔隙结构, 氮气吸附法

Abstract:

Based on the conventional anatomical analysis, the pore structures of poplar tension wood, such as specific surface area, pore volume and pore size distributions were characterized by nitrogen adsorption-desorption method. The shapes of the pores were estimated by nitrogen adsorption isotherms. The results show that poplar tension wood with BET specific surface area of 21.9 m²·g^-1, which is 13 times higher than that in opposite wood. Poplar tension wood has intact mesoporosity (pore size between 2-50 nm) with inkbottle and slit shape pore, as well as a certain amount of micropores and macropores. The maximum value of pore size distribution appears at 5 nm. The pore volume with diameter ranging from 4-7 nm makes up 74.4% of the total, and larger than 15 nm, 10.8%. The high amount of mesopores can be attributed to the thick gelatinous layer in poplar tension wood.

Key words: tension wood, pore structure, nitrogen adsorption-desorption method

中图分类号:

S781

苌姗姗;胡进波;Clair Bruno;Quignard Françoise. 氮气吸附法表征杨木应拉木的孔隙结构[J]. 林业科学, 2011, 47(10): 134-140.

Chang Shanshan;Hu Jinbo;Clair Bruno;Quignard Françoise. Pore Structure Characterization of Poplar Tension Wood by Nitrogen Adsorption-Desorption Method[J]. Scientia Silvae Sinicae, 2011, 47(10): 134-140.

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氮气吸附法表征杨木应拉木的孔隙结构

Pore Structure Characterization of Poplar Tension Wood by Nitrogen Adsorption-Desorption Method

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