作者：
Long Liang;Ting Wu;Kuizhong Shen;Guigan Fang;Yiqiang Wu;...
期刊：
Cellulose,2024年:1-14 ISSN：0969-0239
通讯作者：
Kuizhong Shen<&wdkj&>Guigan Fang
作者机构：
[Long Liang; Ting Wu; Kuizhong Shen; Guigan Fang; Shanming Han; Mengke Zhao] Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province;Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Lab. for Biomass Chemical Utilization, Nanjing, China;State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China;Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, China;[Yiqiang Wu] School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
通讯机构：
[Kuizhong Shen; Guigan Fang] I;Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province;Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Lab. for Biomass Chemical Utilization, Nanjing, China<&wdkj&>Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, China<&wdkj&>Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province;Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Lab. for Biomass Chemical Utilization, Nanjing, China<&wdkj&>Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, China
摘要：
In chemi-mechanical pulping process, selective fiber separation strategies directly affect pulp property. The secondary wall (SW) separation strategy and middle lamella (ML) separation strategy expose more chemical structures from polysaccharides and lignin on the pulp fiber surface, respectively. Hydrogen-containing groups in these chemical structures generate characteristic spectral changes in response to water perturbation, which makes it possible for surface property analysis of pulp fibers based on near-infrared spectroscopy (NIR). Here, two-dimensional correlation spectroscopy (2DCOS) was obtained by the dynamic NIR spectra of pulp fibers with various equilibrium moisture content (EMC). The 2DCOS-NIR can provide richer structural and distributional information about hydrogen-containing groups which characterize the differences in surface chemical properties due to selective separation of the fibers. In synchronous map, the fibers separated at SW have significant water perturbation-induced spectral changes at the bands due to polysaccharides, and the fibers separated at ML have characteristic spectral changes at the bands due to hydrogen-containing groups from lignin. Furthermore, the 2DCOS spectral features can also accurately reflect the variation in the distribution of hydrogen bonding on the fiber surface under different refining conditions, which directly affects the strength properties of pulp fibers. The PLSR model based on 2DCOS spectral features exhibits excellent and robust predictive performance for internal bond strength with RMSEp of 7.17 J/m2, R of 0.9378 and RPD value of 4.11.
摘要：
In this work, we present a simple and effective approach to enhance the fire safety and anti-corrosion performance of wood by forming in-situ self-assembled amphiphilic Ag-PW nanospheres (NSP) at room temperature. The morphology and acid capacity of the NSP were optimized by changing the ratio of phosphotungstic acid (HPW) and silver nitrate. The Ag-PW NSP were successfully integrated into the bulk of the wood, resulting in a durable treatment with minimal leaching. Comprehensive characterization techniques, including FTIR, XPS, XRD, SEM, TEM, and nitrogen adsorption–desorption analysis, confirmed the in-situ formation of Ag-PW NSP in the wood. The treatment exhibited low-leaching properties with only 5.89% of Ag-PW1a leaching out. The treated wood demonstrated excellent flame-retardant (FR) properties, as evidenced by a limiting oxygen index value > 28% and easy passage of the UL-94 test, with the formation of a high-density char layer. The flammable pyrolysis products released during combustion were found to be significantly altered, with a change in the depolymerization route of conversion of LGO under acid conditions to HMF, which was verified by DFT calculations. The treated wood also exhibited outstanding anti-corrosion properties, with a mass loss rate of less than 1%, compared to at least 32.3% for bare wood after the anti-white or brown-rot fungus tests. Moreover, the treated wood samples maintained their excellent FR properties even after leaching. Our study provides valuable insights for the rational design of nano-material additives for wood protection, thereby improving the usage of wood resources while mitigating health and environmental hazards.
期刊：
Materials Science and Engineering B-Advanced Functional Solid-State Materials,2023年296:116663 ISSN：0921-5107
通讯作者：
Wan, Caichao;Wu, YQ
作者机构：
[Wu, Yiqiang; Li, Xuanze; Cheng, Wenjie; Wan, Caichao; Wan, CC; Chai, Yaling] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Wan, Caichao] Yihua Lifestyle Technol Co Ltd, Huaidong Ind Zone, Shantou 515834, Peoples R China.;[Zeng, Qi] Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen 518055, Peoples R China.
通讯机构：
[Wu, YQ ; Wan, CC] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Poplar;Pore-rich carbon;Counter electrodes;Dye-sensitized solar cells
摘要：
Common Pt-based electrocatalysts have the disadvantages of high cost and easy deactivation. The research focus will be the development of carbon-based counter electrodes (CEs) due to the high conductivity and stability in the electrolytes. This paper prepares a kind of CE with wood-derived pore-rich carbon (WDPRC), which uses poplar as the precursor and activates with KOH at different temperatures (700, 800, and 900 degrees C). 800-WDPRC (800 represents temperature) had a large specific surface area of 1234.30 m2/g, which shows that it has a rich pore structure, and provides more active sites for the reaction. And the DSSCs' PCE with 800-WDPRC (5.99%) is higher than the wood-derived carbon (WDC) (carbonize at 800 degrees C and without activation) (2.32%). As for the CEs' materials, the WDPRCs' manufacturing process is simple (only two steps), and the materials used are environment-friendly and low in price. Therefore, this paper provides a new idea for preparing clean and efficient DSSCs' CEs.
摘要：
A novel hybrid material derived from wood and acid nanospheres was synthesized by facile in-situ self-assembly of phosphotungstic acid (HPW) and triethylamine (TEA) at room temperature. The uniformly dispersed amphiphilic TEA-PW nanospheres furnished the wood with controlled particle sizes, and the acid capacity of the material could be altered by varying the molar ratio of HPW and TEA. Furthermore, the TEA-PW/wood hybrid had good anti-leach properties, which were attributed to the acid nanospheres' amphiphilicity. Notably, the hybrid material displayed excellent flame-retardant characteristics even with a low dose of the TEA-PW nanospheres (only 18.6 mass %), resulting in a UL-94V-0 rating and a 41.4% and 44.8% decrease in the pk-HRR and TSR of the untreated wood, respectively. Effective flame retardation was primarily attributed to synergistic effects, molecular firefighting properties, and catalytic carbon reactions in the condensed phase high-density nitrogen-phosphorus-oxygen cross-linking network carbon layer, as well as the capture or dilution of flammable gases by free radicals. In conclusion, this hybrid material may provide new possibilities for the development of fire-resistant woods. (c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
摘要：
Nanocrystalline cellulose (NCC) preparation in an integrated fractionation manner is expected to solve the problems of low yield and environmental impact in the traditional process. An integrated fractionation strategy for NCC production from wood was developed through catalytic biomass fractionation, the partial dissolution of cellulose-rich materials (CRMs) in aqueous tetrabutylphosphonium hydroxide, and short-term ultrasonication. The presented process could tolerate a high CRM lignin content of 21.2 wt % and provide a high NCC yield of 76.6 wt % (34.3 wt % of the original biomass). The increase in the CRM lignin content decreased the NCC yield, facilitated the crystal transition of NCC from cellulose I to cellulose II, and showed no apparent effects on the NCC morphology. A partial/selective dissolution mechanism is proposed for the presented strategy. This study provided a promising efficient fractionation-based method toward comprehensive and high-value utilization of lignocellulosic biomass through effective delignification and high-yield NCC production.
期刊：
Green Chemistry,2023年25(9):3322-3353 ISSN：1463-9262
通讯作者：
Yiqiang Wu
作者机构：
[Wei, Song; Wu, Yiqiang; Wan, Caichao] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Yiqiang Wu] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China
摘要：
In the last few years, renewable, inexpensive, biocompatible, and biodegradable wood and lignocellulose materials have triggered considerable research interest for application in various functional devices. However, there is still a lack of a new perspective to deeply understand the structure–property–function relationships of micro-/nanostructures and components of natural wood, so as to explore the potential of wood assembly of nano-energy materials with different dimensions. Herein, the recent progresses in the design and construction of free-standing supercapacitor (SC) electrodes containing wood-derived materials are reviewed. We begin with an illustrated introduction to the hierarchical structure and characteristics of natural wood with a “top–down” view, which includes the cell walls, cellulose microfibers, nanocellulose, and cellulose supramolecules. Next, the fabrication, structure, and properties of lignocellulose are highlighted. We focus on the structure–property–function relationships between the hierarchical micro- and nanoscale structure of wood and electroactive materials. The focus then turns to a summary of the recent advances in wood-based free-standing SC electrodes with a unique point that is ever out of the spotlight, including one-dimensional integrated fibers, two-dimensional flexible films/papers, three-dimensional porous hydrogels/aerogels, and ultra-thick electrodes. Finally, we put forward our perspectives on the challenges to further promoting the development of this emerging field in the future.
期刊：
Chemical Engineering Journal,2023年470:144221 ISSN：1385-8947
通讯作者：
Wu, YQ
作者机构：
[Wu, Yiqiang; Yuan, Yuan; Lin, Xianxian; Zhang, Zhen; Wang, Hang; Zheng, Long] Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha, Peoples R China.;[Qiu, Chendong; Guo, Xi; Sun, Weisheng] Zhejiang Agr & Forestry Univ, Coll Chem & Mat Engn, Hangzhou, Peoples R China.
通讯机构：
[Wu, YQ ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha, Peoples R China.
关键词：
Leaf transpiration;Reversible fire retardancy;Temperature regulation;Phase -change hydrogel;Cellulose fiber
摘要：
The demand for advanced fire-retardant wearable materials has increased with a rise in fire disasters in modern society. However, traditional fabrics have some drawbacks including non-temperature regulation, non-recyclability and contaminated products. Here, inspired by leaf transpiration, we prepared a reversibly flame-retardant thermal regulation material (LPWH). Wood cellulose skeleton is expected to be a reinforced mechanical scaffold by imitating the role of leaf vein for water collection and transportation. In parallel, to mimic the mesophyll cells around leaf vein, a hydrophilic and porous phase-change hydrogel aggregation is prepared by anchoring polyethyleneglycoldiacrylate-co-sodium vinylsulfonate copolymer on cellulose fibers and subsequent in-situ assembly of sodium alginate. This precise combination creates an artificial transpiration tissue, achieving effective heat dissipation and temperature regulation via water transpiration and phase-change behavior of hydrogel aggregation. LPWH shows a longer ignited time of 150 s (71% extension), a lower total smoke release of 22.3 m2/m2 (76% reduction), together with an ultralow fire growth index of 2.4 compared to commercial fire-retardant cotton fabric. Moreover, reversible fire retardancy (30 cycles) and great mechanical property (351 times higher than pure phase-change hydrogel) are demonstrated, suggesting LPWH can be the next generation of the pollution-free, recyclable temperature-regulated fire-retardant fireproof suit.
期刊：
Journal of Materials Science,2023年58(14):6057-6075 ISSN：0022-2461
通讯作者：
Caichao Wan<&wdkj&>Yiqiang Wu
作者机构：
[Wu, Yiqiang; Li, Xuanze; Cheng, Wenjie; Wan, Caichao; Chai, Yaling] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Caichao Wan; Yiqiang Wu] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, People’s Republic of China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, People’s Republic of China
摘要：
Solar cells can convert solar energy into electric energy, which features good environmental friendliness and high efficiency, thus receiving wide attention from researchers at home and abroad. Dye-sensitized solar cells (DSSCs) are a class of high-profile solar cells, but involved carbon materials (such as graphene and carbon nanotubes) are generally expensive. As a result, it is essential to develop high-performance and low-cost carbon materials. Biomass-derived carbon materials (BCs) hold the characteristics of high conductivity, adjustable pores, wide sources, easy preparation, and high stability. DSSCs' stability and power conversion efficiency are significantly improved when BCs used in solar cells. This review first summarizes biomass's source and structural characteristics according to these circumstances. It elaborates on the preparation and modification ways of BCs. Then the working principle of DSSCs is introduced. Finally, this review systematically expounds on the research progress and application status of BCs as the core components' materials of DSSCs, such as counter electrodes and photoanodes. This review aims to clarify BCs' application strategy and development direction in DSSCs. It provides scientific and technological support for better promoting the application of BCs in solar cells.
期刊：
Construction and Building Materials,2023年366:130240 ISSN：0950-0618
通讯作者：
Yang, Shoulu(yangshoulucsuft@163.com)
作者机构：
[Ding, Fangjun; Liu, Zhu; Yang, Shoulu; Ji, Ning; Wang, Zhongwei] Guizhou Acad Forestry, Guiyang 550005, Peoples R China.;[Wu, Yiqiang; Yang, Shoulu] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410000, Peoples R China.
通讯机构：
[Shoulu Yang; Fangjun Ding] G;[Yiqiang Wu] C;Guizhou Academy of Forestry, Guiyang 550005, PR China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410000, PR China<&wdkj&>Guizhou Academy of Forestry, Guiyang 550005, PR China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410000, PR China
摘要：
Flexible, transparent and conductive materials applied to the electromagnetic interference (EMI) shielding of foldable and wearable devices is urgently demanded in fifth-generation internet era. However, it is still a great challenge to realize excellent EMI shielding effectiveness (EMI SE) while maintaining high light transmittance. Herein, a double-layered structure strategy was proposed to prepare transparent and conductive silver nanowires (AgNWs) film with outstanding EMI SE. Specifically, the AgNWs network was partially embedded to hydroxy propyl methyl cellulose (HPMC) coating to enhance greatly its connectivity and integrity. As a result, the AgNWs/HPMC film showed a high transmittance of 90.55% at 550 nm and a sheet resistance of 11.62 Omega/sq, much better than other reported AgNW composite films so far. Meanwhile, the structural design also contributed to a high EMI SE of 45.79 dB. Meanwhile, it exhibited an enhanced conductive stability during bending test and harsh environment, such as full-oxygen, thermal and cold environment. Moreover, the multifunctional AgNWs/HPMC film presented remarkable thermal management performances including safe heating temperature (~ 71.3 degrees C) at high supplied voltages (7 V), ultra rapid response time (~ 11 s), long-term heating stability and reliability. This work presented a facile and scalable approach to obtain the flexible AgNWs/HPMC film with high light transmittance and high EMI SE, promising for the EMI shielding foldable and homoiothermy wearable system for human.(c) 2022 Elsevier B.V. All rights reserved.
作者机构：
[Yiqiang Wu] College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Di Xie; Kai Zhang] Guangxi Key Laboratory of Processing for Nonferrous Metallic and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China;[Shaoqiu Ke; Fangchao Cheng] College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Guangxi Key Laboratory of Processing for Nonferrous Metallic and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
通讯机构：
[Fangchao Cheng; Yiqiang Wu] C;College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Guangxi Key Laboratory of Processing for Nonferrous Metallic and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
摘要：
Herein, we demonstrate a structure-enabled strategy to construct an ultrastable, high-performance, ultraflexible all-in-one supercapacitor with a one-piece wood cellulose network/polyaniline/multiwalled carbon nanotube composite as both the electrodes and the separator. A cellulose network was used as the carrier and separator, and multiwalled carbon nanotube and polyaniline acted as conducting materials. Excellent flexibility was achieved by combining the cellulose network with a polyvinyl alcohol-based electrolyte. Natural directional channels in the cellulose network and the gradual distribution of the polyaniline and carbon nanotube within the structure enabled the construction of an integrated supercapacitor with reduced contact resistance between layers and improved electronic/ionic conductivity and stability. The supercapacitors resulted in a high specific areal capacitance of 0.71 F cm−2, as well as ultrastable cycle performance, which led to a 106.68% retention of the specific capacitance after 50 000 loops at a current density of 3 A g−1. The current study provides a nature-inspired strategy to rationally design and construct environmentally friendly high-performance and ultrastable energy storage devices.
作者机构：
[Ying Zhu; Wanke Cheng; Wenshuai Chen; Haipeng Yu] Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040 P. R. China;Institute of Industrial Chemistry and Energy Technology, Shenyang University of Chemical Technology, Shenyang, 110142 P. R. China;[Yiqiang Wu] College of Materials Science and Technology, Central South University of Forestry and Technology, Changsha, 410004 P. R. China;[Dawei Zhao] Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040 P. R. China<&wdkj&>Institute of Industrial Chemistry and Energy Technology, Shenyang University of Chemical Technology, Shenyang, 110142 P. R. China
摘要：
To improve the hydrophobicity and thermoplastic processability of starch, lactic acid esterified starch (LA-e-starch) was prepared by in-situ solid phase esterification with corn starch as the raw material and LA as the esterifying agent. Fourier transform infrared spectroscopy confirmed that the esterification reaction was successful. The optimal esterification efficiency of LA-e-starch was obtained when the LA proportion was 20% by mass, catalyst ratio at 3%, reaction temperature 80 degrees C and reaction time 2.5 h. LA-e-starch was characterized by scanning electron microscopy (SEM), contact angle (CA) analysis, X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) as well as its water absorption rate evaluated. Results showed that in-situ solid phase esterification mainly occurred on starch granule surfaces and did not destroy the starch granularity. LA-e-starch surfaces were covered with a layer of polylactic acid resin, which caused starch granules to stick together. The initial contact angle of LA-e-starch was clearly larger than that of native starch and the water absorption rate lower than native starch in a 168 h test time, which showed that esterification effectively improved the hydrophobicity of starch. This esterification destroyed the crystalline structure of starch to some extent, resulting in a crystallinity reduction to 25.16%. In addition, the gelatinization temperature and enthalpy were lower than those of native starch. XRD and DSC analyses indicated that esterification modification increased starch thermoplasticity. Also, LA-e-starch exhibited better thermal stability than native starch, from which it was inferred that this application of esterification could improve the thermoplastic processability of starch modify the interfacial compatibility between starch and polymer resins.
