作者机构：
[计晓琴; 孙德林; 余先纯; 郝晓峰; 陈新义; 朱志红] College of Material and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[计晓琴; 孙德林; 余先纯; 郝晓峰; 陈新义; 朱志红] 410004, China
通讯机构：
College of Material and Engineering, Central South University of Forestry and Technology, Changsha, China
作者机构：
[孙德林; 余先纯; 郝晓峰] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China;[陈新义; 丁山] College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Sun, D.-L.] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
作者机构：
[郝晓峰; 陈新义; 孙德林; 刘明辉] College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha, 410004, China;[余先纯] College of Material and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
期刊：
Wood Science and Technology,2016年50(3):581-597 ISSN：0043-7719
通讯作者：
Sun, De-lin
作者机构：
[Liu, Ming-hui; Hao, Xiao-feng; Sun, De-lin; Chen, Xian-chun] Cent South Univ Forestry & Technol, Coll Furniture & Art Design, Changsha 410004, Hunan, Peoples R China.;[Yu, Xian-chun] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Sun, De-lin] C;Cent South Univ Forestry & Technol, Coll Furniture & Art Design, Changsha 410004, Hunan, Peoples R China.
关键词：
Fracture Toughness;Carbon Fibre;Sinter Temperature;Glassy Carbon;Matrix Material
摘要：
To improve the structure and basic performance, carbon fibre-reinforced woodceramics with a laminated structure were prepared by using liquefied wood and carbon powder as matrix materials and carbon fibre as a reinforcing material through structure and process designs with the establishment of a unit structure model thereof. Basic performance tests indicated that the sintering temperature and content of liquefied wood played important roles. The apparent density first reduced, later increased and then decreased with increasing sintering temperature; the apparent porosity decreased with increasing liquefied wood content. Scanning electron microscopy showed that the woodceramics presented a clear laminated structure and tight joints between glassy carbon (GC) and the embedded carbon fibres. There was an interface layer found between the amorphous carbon and GC. Meanwhile, it still partially retained the natural structural characteristics of wood. Raman spectrum detection verified that raising the sintering temperature could increase the number of graphite crystallites and the orderliness of their arrangement. Transmission electron microscopy showed that the specimens formed at higher temperatures presented clear lattice fringes. In addition, the laminated structure and the application of reinforced carbon fibre greatly enhanced the bending strength, elastic modulus, and fracture toughness.
作者机构：
[余先纯; 任思静] College of Materials and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China;[郝晓峰; 陈新义; 孙德林; 刘明辉] College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Sun, D.-L.] C;College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha, China
作者机构：
[孙德林] College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha 410004, China;[孙德彬] College of Materials and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[余先纯] Basis Department, Yueyang Vocational and Technical College, Yueyang 414000, China
通讯机构：
[Sun, D.-L.] C;College of Furniture and Art Design, Central South University of Forestry and Technology, China
期刊：
Asian Journal of Chemistry,2013年25(18):10191-10194 ISSN：0970-7077
通讯作者：
Yu, Xianchun
作者机构：
[Yu, Xianchun; Zhou, Sirou; Fu, Xijun] Yueyang Vocat & Tech Coll, Comprehens Utilizat Key Lab Chinese Herbal Med Yu, Yueyang 414000, Hunan, Peoples R China.;[Yu, Xianchun; Sun, Delin] Cent South Univ Forestry & Technol, Coll Mat & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Yu, Xianchun] Y;Yueyang Vocat & Tech Coll, Comprehens Utilizat Key Lab Chinese Herbal Med Yu, Yueyang 414000, Hunan, Peoples R China.
关键词：
Process optimization;Semi-bionic approach;Ultrasonic-assisted extraction;Wild persimmon leaves tannin
摘要：
Tannin was extracted from wild persimmon leaves (Diospyros kaki L.f ) using the ultrasonic-assisted semi-bionic approach. Infrared spectrum analysis showed that tannins from wild persimmon leaves contain many proanthocyanidin-like substances with 3-O-gallate acyl structure. Free radical scavenging capacity assay showed that the ultrasonic-assisted semi-bionic approach can improve the scavenging activity of tannins on radicals, including OH, DPPH and ABTS+. The half maximal inhibitory concentration values were reduced by 0.62, 0.116 and 1.19 mg mL-1, respectively, compared with the water reflux extraction method. Experimental results of orthogonal optimization showed that the tannin extraction quantity can reach 226.8 mg g-1, which was much higher than the sample obtained without ultrasonic assistance under the following experimental conditions: pH values of 1.8, 7.5 and 8.4, respectively; 50 % solvent mass fraction; 35 min extraction time; 50 °C extraction temperature; 300 W ultrasonic power and 30 KHz ultrasonic frequency. These results suggested that this method could increase the activity and extraction yield of tannins.
