通讯机构：
[Sun, DL ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
摘要：
Bamboo is an environmentally friendly building structural material. This work investigated the cavity structural characteristics and physical and mechanical properties of honeycomb sandwiches and natural bamboo in the longitudinal direction. The effective elastic parameters of periodically arranged hexagonal bamboo honeycomb cells under in-plane and out-of-plane loads were modeled using analytical and numerical approaches. Then, the effective elastic parameter model of bamboo honeycomb cells was validated by experiments and finite element analysis. The average errors between the calculated and experimental equivalent modulus of elasticity, Poisson's ratio, and shear modulus in the three principal axis directions were 7.43, 4.37, and 8.68%, respectively. The average relativities between the model values of the elastic parameters of the bamboo honeycomb cell and the simulation results in the three directions were 5.46, 5.40, and 6.12%, respectively. The experimental and finite element analysis showed that the constructed effective elastic parameter model of the bamboo honeycomb cell better reflected the state of the bamboo core when subjected to force. This study provides insights for further research on the mechanical properties of bamboo materials and their application in bamboo-based lightweight and high-strength sandwich structures.
摘要：
Exploring new electrode structures and co-doped composite biomass material electrodes is considered to be an effective way of developing cheap, efficient carbon-based supercapacitors. A bamboo-based sandwich-structured matrix was prepared from thin bamboo veneer and bamboo fiber by pretreatment with H(3)PO(4) and Co(2+)-catalyzed graphitization. The pore structure was modulated by hydrothermal activation with NaOH and electrodeposition of carbon nanotubes (CNTs) to obtain CNTs modified, Co/P co-doped sandwich-structured woodceramics electrode (CNT@Co/P). It not only has an obvious sandwich structure, but also retains the natural structural characteristics of bamboo. The specific capacitance of the resulting electrode (CNT@Co/P-20) is as high as 453.72F/g using 1wt% of carboxylated multi-walled carbon nanotubes (CMWCNT) solution as the deposition electrolyte at a current density of 0.2 A/g for 20min at room temperature. When the power density is 500W/kg, the energy density reaches 21.3Wh /kg, showing a good electrochemical performance.
摘要：
Solid wood bending component has good mechanical properties and unique artistic characteristics. To investigate bending properties of solid wood and its mechanism, this paper has conducted the studies of softening and bending teakwood which is chosen as raw material, vacuum impregnation was carried out with environmentally friendly triethanolamine (TEA), sodium chloride (NaCl) and sodium dodecyl benzene sulfonate (SDBS) as compound softening solution, and the wood was softened with superheated steam as the medium. The results show that the infiltration of softening solution can increase the content of O and N elements in the wood and form C-NH2 and C-N bonds with C element. When the concentration of softening solution is 15% (m/m), the wood presents the best bending property, and the bending coefficient can reach 1/9.24, which is 20.48% higher than that of the untreated wood, and the qualification rate of bending components is increased to 85%. After drying and shaping, compression strength parallel to grain and bending strength increased by 22.91% and 20.82%, as well the indentation modulus and hardness of the cell wall increased by 16.70% and 21.45%, respectively. Meanwhile, the wet swelling rate and chord length change rate decreased by 51.39% and 3.37%.
摘要：
A sandwich-like woodceramics matrix was prepared using bamboo veneer as an external cladding layer, bamboo powder and fiber as a core layer, and thermosetting phenolic resin as the adhesive. The matrix was then modified and regulated by in-situ carbon nanotubes (CNTs) using coal-pitch as a pyrolysis gas source and (CH3COO)2Co as a catalyst to obtain self-supported electrodes. The process parameters were optimized by uniform experiments. The results showed that many CNTs were generated when the in-situ growth temperature, time and catalyst dosage were 950 celcius, 1 h and 6%, respectively. There are a lot of mesoporous pores in the electrodes, and the specific surface area is 436.3 m2/g. Meanwhile, it has good electrochemical performance, the specific capaci-tance reaches 363.02 F/g at a current density of 0.1 A/g, which is 142% higher than that without CNTs modification. After 5000 cycles, the 99.76% of the specific capacitance is retained. In addition, its power density reaches 100.53 W/kg as the energy density is 37.88 Wh/kg, indicating the modification of CNTs can improve the structure and electrochemical performance of bamboo sandwich-like woodceramics electrodes.
期刊：
Colloid and Interface Science Communications,2023年57:100755 ISSN：2215-0382
通讯作者：
Sun, DL;Yuan, ZQ;Yang, KL
作者机构：
[Sun, Delin; Jiang, Xiawang; Yu, Minggong; Sun, DL] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Li, Cancheng; Yang, Qianqian; Jiang, Xiawang; Yuan, Zhiqing; Yuan, ZQ; Liu, Shujuan; Du, Juan; Meng, Shoutong; Li, Xinyi] Hunan Univ Technol, Natl & Local Joint Engn Res Ctr Adv Packaging Mat, Sch Packaging & Mat Engn, Zhuzhou 412007, Peoples R China.;[Yang, KL; Yang, Kangli] Cent South Univ, Zhuzhou Cent Hosp, Xiangya Med Coll, Dept Teaching, Zhuzhou 412000, Peoples R China.;[Yang, KL; Yang, Kangli] Cent South Univ, Zhuzhou Affiliated Hosp, Xiangya Med Coll, Zhuzhou 412000, Peoples R China.
通讯机构：
[Yang, KL ; Sun, DL ] C;[Yuan, ZQ ] H;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;Hunan Univ Technol, Natl & Local Joint Engn Res Ctr Adv Packaging Mat, Sch Packaging & Mat Engn, Zhuzhou 412007, Peoples R China.;Cent South Univ, Zhuzhou Cent Hosp, Xiangya Med Coll, Dept Teaching, Zhuzhou 412000, Peoples R China.
关键词：
Highly flame-retardant;Superhydrophobic surface;Kraft paper;Carbon black nanoparticles;Polydimethylsiloxane
摘要：
To solve the problem of poor water resistance and flammability of kraft paper, we proposed a simple and efficient method for preparing highly flame-retardant superhydrophobic coating for kraft paper. Ammonium poly-phosphate (APP) and aluminum hydroxide (ATH) were utilized as the flame retardant layer, while Poly-dimethylsiloxane (PDMS) and candle soot were employed for the superhydrophobic layer. The results revealed that the limiting oxygen index (LOI) of superhydrophobic flame retardant kraft paper (SFKP) was as high as 80%, 296.0% higher than that of ordinary kraft paper (OKP). In addition, the water contact angle (WCA) of the SFKP surface reaches 154.1 degrees, and the water sliding angle (WSA) is 3 degrees. Meanwhile, the WCA of SFKP remains above 150 degrees after 12 h of immersion in water. This indicates that SFKP has excellent flame retardancy and water resistance, and is expected to be utilized in harsh environments such as floods or fires.
期刊：
Journal of Alloys and Compounds,2023年939:168775 ISSN：0925-8388
通讯作者：
Sun, DL
作者机构：
[Gong, Le; Sun, Delin; Sun, DL; Sun, Zhenyu; Li, Luanyu; Wang, Zhanghen] Cent South Univ Forestry & Technol, Coll Mat & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Sun, DL ] C;Cent South Univ Forestry & Technol, Coll Mat & Engn, Changsha 410004, Peoples R China.
关键词：
Bamboo basic woodceramics;Self-supporting electrode;Sandwich structure;Ni2+;Catalysis N P co-doping
摘要：
Exploring new electrode structure and co-doped biomass carbon materials is considered as an effective approach to develop cheap and efficient energy storage devices. The sandwich structure based on bamboo basic woodceramics self-supporting electrode (BSWE) is obtained from bamboo veneer and bamboo fibers under the catalytic action of Ni2+. Ammonium phosphate ((NH4)3PO4) solution is used as the dopant for hydrothermal activation for co-doping N (nitrogen) and P (phosphorus). The uniform experiment finds that BSWE exhibits the highest specific capacitance in the presence of 12% (NH4)3PO4 solution at an activation temperature of 170 celcius and activation time of 7 h. BSWE contains an obvious sandwich structure and conserve natural pores of bamboo. The specific surface area is as high as 736.83 m2 g-1, and the pore size is mainly distributed in the range of 0.5-1.0 nm. Ni2+ is partially reduced to elemental Ni and plays a dual role in catalytic graphitization and doping. As well, N and P form a stable structure with woodceramics matrix, resulting in BSWE shows a good electrochemical performance, the energy density reach 12.53 Wh kg-1 as the power density is 500 W kg-1. (c) 2023 Elsevier B.V. All rights reserved.
期刊：
Journal of Cleaner Production,2022年371:133701 ISSN：0959-6526
通讯作者：
Delin Sun<&wdkj&>Xiawang Jiang
作者机构：
[Sun, Delin; Qin, Meng; Jiang, Xiawang; Yu, Minggong; Yao, Linghua; Wang, Zhangheng] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Delin Sun; Xiawang Jiang] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, Hunan, China
摘要：
Newly harvested Moso bamboo (Phyllostachys pubescens Mazel) was treated with sodium copper chlorophyll (SCC) for green retention using sodium chloride (NaCl) as a penetrator and sodium dodecyl benzene sulfonate (SDBS) as a surfactant. The green preservation process was optimized using the response surface methodology design, and the chemical structure, biodegradability, light resistance, and thermal stability of the green-protected bamboo were characterized. The results show that the finest green retention effect of bamboo was achieved when the period was 90 min, the temperature 90 °C, and the concentration of green retention agent 3%. Moreover, the structure and property analysis show that the SCC penetrates into the bamboo's interior through the thin-walled cells and fibers located on the surface as well as the internal pits, fills the cell cavities and cell interstices, and combines with the internal active functional groups to form hydrogen and chemical bonding. Thus it improves the light and thermal stability of bamboo effectively. Compared with original bamboo as well as bamboo prepared using traditional green preservation methods, the color stability of green-protected bamboo is preferable, and the green color maintainable for more than two years. Furthermore, biodegradation might occur, realizing the whole life cycle of green preservation of bamboo products.
摘要：
为解决MTS（库存生产，Make to stock）型实木家具生产调度的问题，提高家具企业的生产效率。通过对MTS型实木家具企业生产实际特点的分析，将具有全局优化性能和强鲁棒性能特点的模拟退火算法运用到家具生产调度中，以实现实木家具生产调度中最小化最大完工时间的优化目标。根据MTS型家具企业生产调研的数据，利用python软件进行模拟退火算法设计并进行仿真实验。结果表明，退火算法能够有效优化MTS型实木家具企业的生产调度，使生产效率提高了8.3%，这对于解决家具生产调度问题有一定的借鉴意义。
作者机构：
[余先纯; 孙德林; 计晓琴; 王张恒] College of Material and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[余先纯; 孙德林; 计晓琴; 王张恒] 410004, China
通讯机构：
[Xianchun Yu; Delin Sun] C;College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
摘要：
In order to improve the electrochemical performance of biomass electrodes and prolong their service life, the Co2+ doped sandwich structure woodceramics composite electrode is prepared by utilizing cherry wood veneer and pine needle carbon powder as external cladding layer and core layer, respectively, accompanying with catalyst and dopant Co(NO3)(2.6)H2O. Scanning electron microscopy (SEM) reveals that a three-dimensional network can be obtained by an external cladding layer which maintains natural pore structures and pine needle toner core layer which possesses the hollow tubular structure attach with the transverse holes tube wall. Transmission electron microscopy (TEM) results exhibit that the doped Co nanoparticles are wrapped by graphitized carbon which improves the corrosion retardancy and prolongs the service life of electrodes. X-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS) analysis indicates that the doped Co2+ exists mainly as metallic cobalt (Co) after a series of reactions, but also with a small amount of Co2+. The electrochemical measurements presents that the specific capacitance of the resultant electrodes can reach 319 F g(-1) specific capacitance and capacitance retention rate can maintain 98.7% after 15,000 cycles under 0.1 A g(-1) current density in the inorganic system (6 mol L-1 KOH). The practical assembled in symmetrical capacitor with the energy density of 33.86 Wh kg(-1) has been performed at a power density of 100 W kg(-1). Those enhanced performances explain that this novel sustainable sandwich electrode has a good potential for practical application with a long cycle life. (C) 2021 Elsevier B.V. All rights reserved.
