作者机构：
[陈卫民; 郑霞; 吴义强; 李新功; 凌启飞] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
通讯机构：
[Li, X.-G.] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, China
期刊：
Applied Mechanics and Materials,2013年401-403:767-770 ISSN：1660-9336
通讯作者：
Wu, Yiqiang
作者机构：
[Hu, Yunchu; Wu, Yiqiang; Wu, Guihong; Zhu, Xiaodan] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
会议名称：
3rd International Conference on Frontiers of Manufacturing Science and Measuring Technology (ICFMM 2013)
会议时间：
JUL 30-31, 2013
会议地点：
LiJiang, PEOPLES R CHINA
会议主办单位：
[Wu, Guihong;Wu, Yiqiang;Hu, Yunchu;Zhu, Xiaodan] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
会议论文集名称：
Applied Mechanics and Materials
关键词：
Flame depth;Flame height;Flame spread;Flame spread rate;Mass loss rate
摘要：
To study the effect of sample width on flame spread characteristics, a series of laboratory-scale experiments were conducted employing eucalyptus wood with width from 3 to 7 cm. Flame dimension, flame spread rate and mass loss rate were obtained. The relationship between these flame spread characteristics and sample width was explored. Both the dimensionless average flame height and depth vary as the-n power of sample width. With the increase of sample width, both the flame spread rate and mass loss rate first decrease and then rise. The minimum values appear when sample width measures 6 cm.
期刊：
Journal of Nanomaterials,2013年2013 ISSN：1687-4110
通讯作者：
Wu, Yiqiang
作者机构：
[Wu, Yiqiang; Li, Xianjun; Qing, Yan] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Cai, Zhiyong; Qing, Yan] US Forest Serv, Forest Prod Lab, USDA, Madison, WI 53726 USA.
通讯机构：
[Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
摘要：
To understand the swelling behavior of cellulose nanofibril (CNF) films, the dimensional variation of untreated and phenol formaldehyde modified CNF (CNF/PF) films soaked in distilled water was examined in situ with microscopic image recording combined with pixel calculation. Results showed that a dramatic thickness increase exhibited in both CNF and CNF/PF films, despite being at different swelling levels. Compared to thickness swelling, however, the width expansion for these films is negligible. Such significant difference in dimensional swelling for CNF and PF modified films is mainly caused by nanofibril deposition and their mesostructure. However, addition of PF modifier has a positive effect on the constraint of water absorption and thickness swelling, which is strongly dependent on PF loadings.
作者机构：
College of Material Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,China
会议名称：
第三届中国林业学术大会
会议时间：
2013-09-01
会议地点：
福州
会议论文集名称：
第三届中国林业学术大会论文集
摘要：
A novel type of hierarchically biomorphic carbons (HBCs) with macro-/ microporous and ordered mesostructure has been successfully prepared by using wood as a mimetic template to reproduce the wood cellular structures,and resol as a precursor,triblock copolymer surfactant as a soft-template to construct the mesostructure on the cell wall.Meanwhile,a formation mechanism for the HBCs with ordered mesostructure through evaporation-induced coating and self-assembly method was proposed in detail.X-ray diffraction,scanning electron microscope,transmission electron microscopy and N2 adsorption results indicate that the obtained HBCs have wood cellular structures,ordered mesostructure (P6mm) and high surface areas (~463m2/g).The results show that the mass ratios of PF/poplar shaving showed a greater effect on the pore texture and properties of the HBCs.With a rise in the mass ratios of PF/wood,the mesostructure of HBCs is gradually changed from disordered to ordered 2D hexagonal structure,and the surface areas,pore volumes are increasing accordingly.In addition,the HBCs exhibit good adsorption properties toward organic vapors,demonstrating that this kind of HBCs could be used as a promising material for adsorbents,separation systems.
摘要：
Combined decay and mold resistance of zinc borate-(ZB) and calcium borate-(CB) treated oriented strand board (OSB) from southern mixed hardwood (MHW) and southern yellow pine (SYP) was investigated. Tests were done with a brown-rot fungus, Gloeophyllum trabeum, and a white-rot fungus, Trametes versicolor, for 8 and 12 weeks, respectively. Wood species and fungus type had significant influence on the decay resistance. Decay caused by the brown-rot fungus was evident for all untreated SYP and mixed MHW controls. White-rot fungus did not cause significant sample weight loss for either species group. In the SYP OSB control inoculated with G. trabeum, the hyphae were abundant in wood rays and cell walls where they primarily penetrated through bordered and simple pits. The incorporation of ZB and CB into OSB provided significant protection against the fungi with no significant weight loss observed in the treated OSB. Microscopic analysis showed distinct evidence of fungal colonization and a thinning pattern of cell wall material. Untreated OSB samples from MHW and commercial OSBs were most susceptible to mold growth after 6 weeks. The borate-modified OSB from MHW and SYP effectively prevented the mold growth.
作者机构：
[Wu, Yiqiang; Qing, Yan] Cent South Univ Foreshy & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Sabo, Ronald; Zhu, J. Y.; Cai, Zhiyong; Qing, Yan; Agarwal, Umesh] US Forest Serv, USDA, Forest Prod Lab, Madison, WI 53726 USA.
通讯机构：
[Sabo, Ronald] U;US Forest Serv, USDA, Forest Prod Lab, Madison, WI 53726 USA.
关键词：
Cellulose nanofibrils;Enzymatic and chemical pretreatments;Microfluidization;Refining
摘要：
Various cellulose nanofibrils (CNFs) created by refining and microfluidization, in combination with enzymatic or 2,2,6,6- tetramethylpiperidine-1-oxyl (TEMPO) oxidized pretreatment were compared. The morphological properties, degree of polymerization, and crystallinity for the obtained nanofibrils, as well as physical and mechanical properties of the corresponding films were evaluated. Compared to refining, intense microfluidization contributed greater separation of nanofibril bundles, which led to an enhancement of mechanical strength and transparency for the resultant film. The selected enzymatic pre-treatments produced shortened fibers due to preferential hydrolysis of amorphous cellulose and, in combination with mechanical treatments, resulted in short and stiff cellulose nanocrystal (CNC)-like materials. Despite films from these CNC-like fibrils having inferior tensile strength, their tensile modulus and transparency were significantly improved compared to CNFs prepared without pre-treatment. The unique fiber morphology and high crystallinity potentially offer a green and ecologically friendly alternative for the preparation of CNCs and CNFs as part of an integrated biorefinery approach.
