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SSRN 2024年

作者： Hao, Shuo Ding, Jiajian Xie, Hao Li, Shuang Wang, Weihong Song, Yongming Fang, Yiqun Liu, Tian Key Laboratory of Bio-Based Material Science and Technology Ministry of Education Material Science and Engineering College Northeast Forestry University Harbin150040 China

Being a low-cost byproduct of rice cultivation, the production of rice straw (RS) is huge, and its rational utilization is of a great challenge. Rice stalk possesses hollow tube shape and porous cell structure, results in lightweight and high insulation properties. Herein, based on its lightweight, we developed a foam composite with excellent mechanical strength. RS were built into a three-dimensional (3D) orthogonal grid and coupled with the incorporation of phenolic foam (PF). This is very different from the traditional reinforcing method of breaking RS into particles or fibers as fillers. The mass content of RS in present foam composite reached as high as 47% with a low thermal conductivity (0.0243 Wm−1K−1). Scanning electron microscopy established the presence of ultramicroscopic particle projections on the outer surface of RS, which is beneficial for enhancing their bonding performance by interlocking. The mechanical organization of RS, consisting of sclerenchyma cells and vascular bundles, can effectively resists deformation, thereby increasing the flexural strength and compression strength of RS/PF foam composite. The orthogonal structure of RS endows the composite with excellent transversely isotropy, withstanding greater edgewise compressive stress than that of flatwise due to the higher axial modulus of RS. Importantly, RS/PF foam composite presented good flame-retardant performance comparable to that of pure PF, because the RS orthogonal grid architecture was well infilled with PF foam. It is concluded that this research provides a simple and efficient way for utilizing RS in constructing lightweight composite. © 2024, The Authors. All rights reserved.

关键词： Thermal conductivity

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Parameter Estimations on Measurement Accuracy for the Thermal Conductivity of Wood Using the Transient Plane Source Method

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SSRN 2024年

作者： Meng, Hongxu Yu, Xinxin Chen, Bonan Ren, Pengyuan Ji, Xinyu Zhao, Jingyao Northeast Forestry University Key Laboratory of Bio-based Material Science and Technology Ministry of Education Harbin150040 China

In order to enhance the reliability and accuracy of the results by the transient plane source (TPS) method for measuring the thermal conductivity of wood. This paper investigates setting parameters and measurement methods to improve measurement accuracy. Criteria are proposed to determine the optimal parameters such as power output, heating time, and time window. The results show that the total to character time, temperature increase of the probe, mean deviation, and temperature drift graph are valid indicators for evaluating the detection reliability of the TPS method. The optimal parameters for measuring the thermal conductivity of wood using the TPS method are: power output of 0.05 or 0.1 W, heating time of 120 seconds, and time window covering 60% to 80% of the heating time. The thermal conductivity measured with the TPS method is higher than that measured by the steady-state method in all grain angle directions. © 2024, The Authors. All rights reserved.

关键词： Thermal conductivity

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Effective purification of oily wastewater using lignocellulosic biomass:A review

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Chinese Chemical Letters 2022年第6期33卷 2807-2816页

作者： Meng Wang Hsu-Sheng Tsai Chaofan Zhang Chengyu Wang Shih-Hsin Ho State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150001China Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Bio-based Material Science& Technology(Northeast Forestry University) Ministry of EducationHarbin 150040China

Due to the frequent occurrence of oil spills and the large-scale production of oily wastewater, the treatment of oily sewage has become an important issue for sustainable development. Recently, materials prepared from lignocellulosic biomass(LCB) for oil-water separation have been found to be effective due to their high separation efficiency, good recyclability, and superior sustainability. However, few reviews have focused on the advantages and limitations of LCB for sewage treatment. This review summarizes the performance of modified LCB in oily wastewater treatment, in terms of the advanced modification methods applied and the structural dimensions of LCB materials according to the principle of superwetting oil-water separation. Research on the preparation technologies, separation mechanisms, and treatment efficiency of different LCB materials are briefly summarized, along with the characteristics of different LCB material types for oily wastewater treatment. Finally, the future prospects and challenges faced in the development of LCB materials are discussed.

关键词： Lignocellulosic biomass Superwetting Oily wastewater Wastewater treatment Oil-water separation

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Cellulose-based functional gels and applications in flexible supercapacitors

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Resources Chemicals and materials 2023年第2期2卷 177-188页

作者： Xiuzhi Zhu Geyuan Jiang Gang Wang Ying Zhu Wanke Cheng Suqing Zeng Jianhong Zhou Guangwen Xu Dawei Zhao Key Laboratory on Resources Chemicals and Materials of Ministry of Education Shenyang University of Chemical TechnologyShenyang 110142PR China Key Laboratory of Pulp and Paper Science&Technology of Ministry of Education Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353PR China Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry UniversityHarbin 150040PR China

In order to resolve the global crisis of fossil energy shortage and climate warming,the development of efficient energy storage devices is a significant topic at *** as the novel type of energy storage devices have the unique advantages,including the fast charging/discharging behaviors,high-energy/power density,and stable cycling *** with traditional supercapacitors,flexible supercapacitors are environmen-tally friendly,light weight,small size and high ***,flexible supercapacitors have a wide application prospect in emerging electronic *** to its flexibility,biocompatibility,and structure designability,cellu-lose and its gel materials are gradually used as electrodes,separators and electrolytes in flexible *** construction processes at molecular scale for high-performance cellulose gels are ***,this review covers the recent progress of developing the flexible supercapacitors and all-in-one supercapacitors based on cellulose functional *** finally discussed the potential challenges and opportunities for cellulose and its derived materials in new-style flexible supercapacitors and other electronic devices.

关键词： Cellulose Functional design Gel materials Flexible supercapacitors

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Bamboo-inspired cell-scale assembly for energy device applications

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npj Flexible Electronics 2022年第1期6卷 152-159页

作者： Qiuqin Lin Runan Gao Daohao Li Yun Lu Shiqin Liu Yanglun Yu Yuxiang Huang Wenji Yu Research Institute of Wood Industry Chinese Academy of ForestryHaidian100091 BeijingChina Key Laboratory of Bio-based Material Science and Technology Ministry of Education Materials Science and Engineering CollegeNortheast Forestry UniversityHarbin 150040China State Key Laboratory of Bio-fibers and Eco-textiles College of Environmental Science and EngineeringQingdao UniversityQingdao 266071China

Rapid advances in flexible and wearable smart textiles demand low-cost,high-energy/power-density fiber-shaped supercapacitors(FSCs).The performance of FSCs is determined by the fabrication and assembly of fiber-shaped electrodes(FSEs),where an active charge-storage material is always clad around flexible charge transmission current *** by the tissue structure of natural bamboo,wherein parenchyma cells(PCs)that store nutrients are clad around bamboo fibers(BFs),we propose a strategy for converting bamboo cells into FSEs using conductive BFs and activated PCs as current collectors and active materials,*** assembled electrode has a high specific capacitance of 1454 mF cm^(−2) at 0.64 mA cm^(−2).A solid-state FSC with a pair of bamboo-structured electrodes exhibited a substantially high energy *** mechanical flexibility enabled the knitting of wearable wristbands to drive ultra-small voltmeter *** lightweight,low cost,and high-energy-density bamboostructured FSC could enable numerous smart textile applications.

关键词： wear energy shaped

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Modifying Urea-Formaldehyde Resin with Ultra-Low Formaldehyde Emission Via Glyoxal Copolymerization and Urea Post-Addition

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SSRN 2024年

作者： Zhao, Jin Wang, Hang Kan, Yufei Gao, Zhenhua Key Laboratory of Bio-based Material Science and Technology Ministry of Education Northeast Forestry University Harbin150040 China Key Laboratory of Lignocellulosic Material Science and Technology of Heilongjiang Province Harbin150040 China

Although urea-formaldehyde (UF) resin is extensively used in the wood industry for its cost-effectiveness, good bonding performance, and excellent technological applicability, achieving a reduction in formaldehyde emission to levels comparable with non-formaldehyde adhesives while maintaining cost efficiency remains a significant challenge. In this study, a novel glyoxal-urea-formaldehyde (GUF) resin with ultra-low formaldehyde release, good cold-pressing performance, and excellent bonding properties was developed via a synergistic strategy involving the glyoxal copolymerization and urea post-addition. FTIR, 13C NMR, XPS, and DSC analyses revealed that the copolymerization of glyoxal, formaldehyde, and urea led to the formation of more substituted hydroxymethyl structures. These structures enhanced the cross-linking reaction between GUF resin and post-added urea, resulting in a significant reduction in formaldehyde emission from GUF-bonded plywood to 0.20 mg/L. This value is 33% lower than the 0.3 mg/L required for F**** grade plywood, according to Japanese JAS standards. Additionally, the GUF-bonded plywood maintained a warm water-soaked wet strength of 0.74 MPa and a cold-pressing strength of 0.82 MPa. The optimal conditions identified were 10 mol.% of glyoxal for copolymerization and 4.5 wt.% of post-added urea. This synergistic strategy offers a cost-effective approach to substantially reducing formaldehyde emission from UF resin, demonstrating promising potential for broad application in the production of wood composites. © 2024, The Authors. All rights reserved.

关键词： Plywood

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Controllable Synthesis of Monodisperse Hierarchical Porous Carbon Nanorods and Their Derived Superstructures for Supercapacitors

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SSRN 2024年

作者： Xu, Zhou Chi, Junlin Wu, Zhenwei Yang, Zheng Miao, Yuanyuan Ma, Chunhui Li, Wei Luo, Sha Liu, Shouxin Key Laboratory of Bio-based Material Science & Technology Northeast Forestry University Ministry of Education Heilongjiang Harbin150040 China

biomass porous nanocarbons has a promising application in electrochemistry. However, controlling the morphology and pore structure presents a formidable challenge. Monodisperse hierarchical porous carbon nanorods (HPCNs) are synthesized from D-xylose, sodium dodecyl sulfate and poly (4-styrenesulphonic acid-co-maleic acid) sodium salt in the hydrothermal condition, followed by activation of KHCO3. Similarly, raspberry-like and spindle-like hierarchical porous nanocarbons can be obtained using sodium laurate and sodium oleate instead of sodium dodecyl sulfate. The hierarchical porous structure facilitates the infiltration and mass transfer process and improves electrochemical performance. In a 6 mol·L-1 KOH electrolyte, the specific capacitance of the HPCNs reaches 302 F·g-1 at a current density of 0.2 A·g-1, and the retention rate is 97% after 6000 charge-discharge cycles at 10 A·g-1. In a pure 1-butyl-3-methylimidazolium tetrafluoroborate electrolyte, a symmetric supercapacitor assembled with HPCNs exhibits a specific capacitance of 125 F·g-1 and an energy density of 39.06 W·h·kg-1 at 0.1 A·g-1. © 2024, The Authors. All rights reserved.

关键词： Supercapacitor

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Post-synthetic modifications of MOFs by different bolt ligands for controllable release of cargoes

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Chinese Chemical Letters 2024年第10期35卷 404-407页

作者： Hao Wang Meng-Qi Pan Ya-Fei Wang Chao Chen Jian Xu Yuan-Yuan Gao Chuan-Song Qi Wei Li Xian-He Bu College of New Materials and Chemical Engineering Beijing Key Lab of Special Elastomeric Composite MaterialsBeijing Institute of Petrochemical TechnologyBeijing 102617China School of Materials Science and Engineering National Institute for Advanced MaterialsTKL of Metal and Molecule-Based Material ChemistryNankai UniversityTianjin300350China College of Chemical Engineering Inner Mongolia University of TechnologyHohhot 010051China

Post-synthetic modifications(PSM)have drawn great attention as a vigoroso tool to tune or enhance the performance of metal-organic frameworks(MOFs).However,the current PSM method usually have to sacrifice the porosity of MOFs to enrich their functionality,such as pore space partition(PSP)and postsynthetic elimination and insertion(PSE&I),causing a trade-off in this *** address this issue,we herein propose a new PSM strategy of using the size-matching ligands as the bolts to lock MOFs'pores,which could be anchored onto open metal sites(OMSs)after guest loading through a stepwise *** a result,the loaded cargoes undergo a controlled releasing process with respect to different bolt *** proposed strategy provides a promising way to balance the functionality and porosity of MOFs.

关键词： Post-synthetic modifications Metal-organic frameworks Bolting ligand Control release Cargo

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Developments of polyurethane in biomedical applications:A review

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Resources Chemicals and materials 2023年第4期2卷 262-276页

作者： Minghui Cui Zheng Chai Yao Lu Jin Zhu Jing Chen Department of Materials Science and Engineering Shenyang University of Chemical TechnologyShenyang 110142PR China Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province Division of Polymer and Composite MaterialsNingbo Institute of Material Technology and EngineeringChinese Academy of SciencesZhejiangNingbo 315201PR China

Polyurethane is an excellent and widely used polymer *** synthesizing polyurethane,the structure of soft and hard segments in polyurethane could be adjusted,which can obtain better properties than other polymer materials,such as good mechanical properties and *** recent years,due to their excellent chemical stability,biocompatibility,and low cytotoxicity,polyurethanes have been widely used for biomedical *** solve the problems of degradation and recycling,the development of bio-based polyurethane has also become a current hot *** paper summarizes the research progress and applications of polyurethane materials for dressings,skin sensors,orthopedics,and *** also looks forward to the future development of polyurethane medical materials.

关键词： Polyurethane Dressings Skin sensors Orthopedics Cardiovascular applications

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Far-from-equilibrium electrosynthesis ramifies high-entropy alloy for alkaline hydrogen evolution

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Journal of materials science & technology 2023年第35期166卷 234-240页

作者： Yunan Wang Hao Yang Zhe Zhang Xiangying Meng Tao Cheng Gaowu Qin Song Li Key Lab for Anisotropy and Texture of Materials(MoE) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

High-entropy alloys(HEAs)provide an ideal platform for developing highly active electrocatalysts and investigating the synergy of mixed ***-from-equilibrium synthesis holds great potential for fabricating HEAs at the nanoscale by rapidly shifting the thermodynamic conditions and manipulat-ing the growth *** far-from-equilibrium synthesis of nanomaterials has been successful un-der thermochemical conditions,it is markedly challenging under electrochemical environments,as the use of an electrolyte limits the accessible temperature window and the temporal tunability of ***,we demonstrate that applying a large electrochemical overpotential would create a far-from-equilibrium condition as changing the temperature of the system by considering the equation △G=△H−T△S+nF△ψ.An electrochemical far-from-equilibrium approach is thus setup for construct-ing hierarchical and self-supporting high-entropy alloy *** large overpotential drives the simultaneous reduction of multiple cations and the subsequent formation of a single-phase *** a proof-of-concept,hierarchical Fe_(0.22)Co_(0.18)Ni_(0.18)Cr_(0.14)Cu_(0.28)was fabricated and used as an electrocatalyst for the hydrogen evolution reaction in alkaline *** noble-metal-free HEA exhibits an overpoten-tial of 84 mV at a current density of 10 mA cm^(-2),which is among the lowest even compared to noble metal-based *** work opens a new avenue for building a variety of HEAs for energy and catalysis applications.

关键词： High-entropy alloys Nanostructures Electrocatalysis Hydrogen evolution reaction Far-from-equilibrium synthesis

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