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Electric field controlled superlubricity of fullerene-based host–guest assembly

Nano Research 2023年第1期16卷 583-588页

作者： Shanchao Tan Hongyu Shi Xin Du Kunpeng Wang Haijun Xu Junhua Wan Ke Deng Qingdao Zeng Yuhong Liu State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Beijing 100190China College of Chemical Engineering Jiangsu Key Lab of Biomass-based Green Fuels and ChemicalsNanjing Forestry UniversityNanjing 210037China Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education Hangzhou Normal UniversityHangzhou 310012China Center of Materials Science and Optoelectonics Engineering University of Chinese Academy of SciencesBeijing 100049China

Controlling friction by the electric field is a promising way to improve the tribological performance of a variety of movable mechanical *** this work,the assembly structure and microscale superlubricity of a host–guest assembly are effectively controlled by the electric *** the help of the scanning tunneling microscopy(STM)technique,the host–guest assembly structures constructed by the co-assembly of fullerene derivative(Fluorene-C60)with macrocycles(4B2A and 3B2A)are explicitly *** with density functional theory(DFT),the distinct different assembly behaviors of fullerene derivatives are revealed at different probe biases,which is attributed to the molecular polarity of the fullerene *** the control on the adsorption behavior,the friction coefficient of host–guest assembly is demonstrated to be controllable in the electric field by using atomic force microscopy(AFM).At positive probe bias,the friction coefficient of the host–guest assembly is significantly reduced and achieves superlubricity(μmin=0.0049).The efforts not only help us gain insight into the host–guest assembly mechanism controlled by the electric field,but also promote the further application of fullerene in micro-electro-mechanical systems(MEMS).

关键词： superlubricity electric field friction control fullerene derivative host-guest assembly

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Synergistic boosting the electrooxidation of biomass-based 5-hydroxymethylfurfural on cellulose-derived Co3O4/N-doped carbon catalysts

Materials Today Catalysis

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materials Today Catalysis 2024年 7卷

作者： Sun, Haixin Gao, Yingying Chen, Mengyuan Li, Ming Xia, Qinqin Liu, Yongzhuang Meng, Juan Dou, Shuo Yu, Haipeng Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin150040 China School of Resources and Environmental Engineering Jiangsu University of Technology Changzhou213001 China

Catalysts play a pivotal role in the efficient conversion of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) through electrochemical oxidation. In this work, a cost-effective and highly efficient cobalt-based electrocatalyst for the synthesis of bio-based carboxylic acids was reported. By the employment of cellulose, which was dissolved in the alkaline-urea with cobalt ion, as the precursor, it derived a carbon-coated Co3O4 (Co3O4@NC) catalyst with a high specific surface area and rich porous structure. When utilized in the electrocatalytic conversion of HMF to FDCA, the catalyst exhibited exceptional yields and Faradaic efficiency which surpassed 95 %. In-situ Raman spectra unveiled that a dual-pathway process occurred on this catalyst, with part of Co3O4 serving as active sites for HMF adsorption, while other Co3O4 transformed into CoOOH during the reaction. This dual-pathway electrocatalysis facilitated the highly efficient conversion of HMF. Additionally, using bio-based alcohols/aldehydes as the feedstocks, eight carboxylic acids were successfully synthesized with yields ranging from 91.5 % to 99 %. This study presents a highly efficient electrocatalyst derived from biomass, enabling diverse bio-based carboxylic acid production with significant potential for sustainable chemical synthesis. © 2024 The Authors

关键词： Electrochemical oxidation

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Pickering multiphase materials using plant-based cellulosic micro/nanoparticles

Aggregate

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Aggregate 2024年第2期5卷 130-145页

作者： Wei Liu Bo Pang Meng Zhang Jiayi Lv Ting Xu Long Bai Xu-Min Cai Shuangquan Yao Siqi Huan Chuanling Si Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and TechnologyTianjinChina Department of Materials and Environmental Chemistry Stockholm UniversityStockholmSweden Key Laboratory of Bio-based Material Science and Technology(Ministry of Education) Northeast Forestry UniversityHarbinChina Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control College of Light Industry and Food EngineeringGuangxi UniversityNanningChina Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Chemical EngineeringNanjing Forestry UniversityNanjingChina Department of Chemistry and Biological Engineering University of British ColumbiaVancouverCanada

Pickering multiphase systems stabilized by solid particles have recently attracted increasing attention due to their excellent *** various solid stabilizers,natural and renewable cellulosic micro/nanoparticles that are derived from agricultural and forestry sources have become promising candidates for Pickering stabilization due to their unique morphological features and tunable surface *** this review,recent progress on forming and stabilizing Pickering multiphase systems using cellulosic colloidal particles is summarized,including the physicochemical factors affecting their assembly at the interfaces and the preparation methods suitable for producing Pickering *** addition,relevant application prospects of corresponding Pickering multiphase materials are ***,current challenges and future perspectives of such renewable Pickering multiphase systems are *** review aims to encourage the utilization of cellulosic micro/nanoparticles as key components in the development of Pickering systems,leading to enhanced performance and unique functionalities.

关键词： cellulose nanocrystals cellulose nanofibrils cellulosic micro/nanoparticles Pickering emulsions Pickering foams

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Soft-Template Hydrothermal Synthesis of N, B Co-Doped Walnut-Shaped Porous Carbon Sphere with Hydrophilic Surface for Supercapacitor

SSRN

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SSRN 2023年

作者： Xu, Zhou Wu, Zhenwei Chi, Junlin Lei, E. Liu, Yuxuan Yin, Yu Yang, Zheng 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

N, B co-doped walnut-shaped porous carbon spheres (NBCs) were prepared by soft-template hydrothermal carbonization of glucosamine, boric acid and block copolymer (P123). The NBCs formed a three-dimensional interconnected structure, and were doped with nitrogen in the forms of pyridine N (N-6), pyrrole N (N-5), graphite N (N-Q), nitrogen oxide (N-O) or N-B and boron in the forms of CB3, CB2O, CBO2 or B-N. Chemical vapor oxidation with controllable low concentration nitric acid was used to transform its super-hydrophobicity into well-hydrophilicity. The porous carbon sphere with hydrophilic surface maintained a relatively complete walnut-shaped structure, high specific surface area and stable heteroatom doping, and exhibited an improved specific capacitance of 281 F·g-1 at a current density of 0.2 A·g-1 and rate performance of 75 % at 5 A·g-1. The assembled symmetrical supercapacitor showed a high energy density of 6.56 W·h·kg-1 at 0.1 A·g-1 and superb cycling stability of 95% after 5000 cycles at 2 A·g-1. For electrode materials, walnut-shaped structure with short electron and ion transport paths enhanced the utilization efficiency. Heteroatom doping improved the conductivity and reactivity. High specific surface area contributed to the storage and transport of ions. Hydrophilic surface facilitated the penetration and mass transfer of ion and electrolyte. © 2023, The Authors. All rights reserved.

关键词： Supercapacitor

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Improving Electrochemical Performance of Cellulose Fiber-based Supercapacitor Electrode Using Polypyrrole-wrapped Iron Oxyhydroxide

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Paper And biomaterials 2021年第3期6卷 10-19页

作者： Youngchu Kang Hailan Jin Xianhui An Xueren Qian Key Laboratory of Bio-based Material Science&Technology(Northeast Forestry University)Ministry of Education HarbinHeilongjiang Province150040China

Polypyrrole(PPy)@cellulose fiber-based composites have been widely investigated as electrode materials for use in flexible ***,they cannot readily provide high specific capacitance and cyclic stability owing to their inherent drawbacks,such as high resistance,Weber impedance,and volume expansion or collapse during charging/*** this study,iron oxyhydroxide(FeOOH)is incorporated in the abovementioned composite to decrease the equivalent series resistance,charge transfer resistance,and Weber impedance,thereby enhancing electron transfer and ion diffusion,which results in superior electrochemical *** PPy-wrapped FeOOH@cellulose fiber-based composite electrode with the molar ratio of FeSO_(4) to NaBH4 of 1∶1 exhibits a high specific capacitance of 513.8 F/g at a current density of 0.2 A/g,as well as an excellent capacitance retention of 89.4% after 1000 cycles.

关键词： cellulose fibers iron oxyhydroxide polypyrrole electrode material electrochemical performance

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Recyclable nanocellulose-confined palladium nanoparticles with enhanced room-temperature catalytic activity and chemoselectivity

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science China materials 2021年第3期64卷 621-630页

作者： Juan Meng Yongzhuang Liu Xiaochao Shi Wenshuai Chen Xianquan Zhang Haipeng Yu Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry UniversityHarbin150040China

We describe the synthesis of even-dispersed palladium nanoparticles(Pd NPs)confined within a cellulose nanofiber(CNF)matrix for developing a high-performance and recyclable *** CNF matrix was composed of CNF-assembled mesoporous nanosheets and appeared as soft and hydrophilic *** Pd NPs(∼6 nm)with high-loading(9.6 wt%)were in situ grown on these mesoporous nanosheets,and their dense spatial distributions were likely to generate nano-confinement catalytic effects on the ***,the CNF-confined Pd NPs(CNF-Pd)exhibited an enhanced room-temperature catalytic activity on the model reaction of 4-nitrophenol hydrogenation with a highest rate constant of 8.8×10^−3 s^−1 and turnover frequency of 2640 h The CNF Pd catalyst possessed good chemical stability and recyclability in aqueous media which could be reused for at least six cycles without losing ***,chemoselective reduction of 3 nitrostyrene was achieved with high yield(80%–98%)of 3-aminostyrene in alcohol/water ***,this work demonstrates a positive nanoconfinement effect of CNFs for developing stable and recyclable metal NP catalysts.

关键词： nanocellulose deep eutectic solvents palladium nanoparticles catalysts nano-confinement

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Acoustic Properties of Metal-Organic Frameworks

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Research 2021年第1期2021卷 1332-1342页

作者： Zhi-Gang Li Kai Li Li-Yuan Dong Tian-Meng Guo Muhammad Azeem Wei Li Xian-He Bu School of Materials Science and Engineering Tianjin Key Lab of Metal and Molecule-Based Material ChemistryNankai UniversityTianjin 300350China School of Physics and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Metal-organic frameworks(MOFs)have attracted significant attention in the past two decades due to their diverse physical properties and associated *** numerous advances have been made,the acoustic properties of MOFs have attracted very little ***,we systematically investigate the acoustic velocities and impedances of 19 prototypical MOFs via first-principle *** results demonstrate that these MOFs exhibit a wider range of acoustic velocities,higher anisotropy,and lower acoustic impedances than their inorganic counterparts,which are ascribed to their structural diversity and anisotropy,as well as low *** addition,the piezoelectric properties,which are intimately related to the acoustic properties,were calculated for 3 MOFs via density functional perturbation theory,which reveals that MOFs can exhibit significant piezoelectricity due to the ionic *** work provides a comprehensive study of the fundamental acoustic properties of MOFs,which could stimulate further interest in this new exciting field.

关键词： field. anisotropy impedance

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biopolymer Nanofibers for Nanogenerator Development

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Research 2021年第1期2021卷 30-49页

作者： Lulu Bai Qing Li Ya Yang Shengjie Ling Haipeng Yu Shouxin Liu Jian Li Wenshuai Chen Key Laboratory of Bio-Based Material Science and Technology Ministry of EducationNortheast Forestry UniversityHarbin 150040China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

The development of nanogenerators(NGs)with optimal performances and functionalities requires more novel *** the past decade,biopolymer nanofibers(BPNFs)have become critical sustainable building blocks in energy-related fields because they have distinctive nanostructures and properties and can be obtained from abundant and renewable *** review summarizes recent advances in the use of BPNFs for NG *** will begin by introducing various strategies for fabricating BPNFs with diverse structures and ***,we will systematically present the utilization of polysaccharide and protein nanofibers for *** will mainly focus on the use of BPNFs to generate bulk materials with tailored structures and properties for assembling of triboelectric and piezoelectric *** use of BPNFs to construct NGs for the generation of electricity from moisture and osmosis is also ***,we illustrate our personal perspectives on several issues that require special attention with regard to future developments in this active field.

关键词： fibers polymer moisture

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Ultrathin and Highly Flexible Layered Silver Nanowires/Carboxymethyl Cellulose Nanofiber Nanocomposite Films for Electromagnetic Interference Shielding

SSRN

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SSRN 2024年

作者： Dai, Yaohui Jiang, Dexing Bai, Long Li, Zhiguo Huo, Pengfei Liu, Yang College of Material Science and Engineering Northeast Forestry University Harbin150040 China Key Laboratory of Bio-based Materials Science & Technology Ministry of Education Northeast Forestry University Harbin150040 China

The development of electronic information technology has led to an increasingly serious problem of electromagnetic radiation pollution. It is urgent to explore a lightweight, flexible, and easy to manufacture electromagnetic interference (EMI) shielding material. In this study, we employed one-dimensional carboxymethyl cellulose nanofibers (CMCs) and silver nanowires (AgNWs) to fabricate a silver nanowire/carboxymethyl cellulose nanofiber (AgNWs/CMC) nanocomposite film with a layered structure through a one-step vacuum filtration self-assembly technique. The results indicate that the unique layered structure of AgNWs/CMC nanocomposite film significantly increases the conductive pathway in the film, which endows the AgNWs/CMC nanocomposite film with significant EMI shielding performance, reaching 87.7dB in the X-band with a thickness of only 20 μm and achieving effective shielding of electromagnetic signals in mobile communication. In addition, AgNWs/CMCs nanocomposite films exhibit excellent Joule heating, heat dissipation, and photothermal conversion performance. Therefore, this layered AgNWs/CMCs nanocomposite film is expected to broaden new application fields, such as wearable heating devices, flexible electronic devices, and other new applications. © 2024, The Authors. All rights reserved.

关键词： Nanocomposite films

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Study on the Improvement of Foaming Properties of PBAT/PLA Composites by the Collaboration of Nano-Fe_(3)O_(4) Carbon Nanotubes

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Journal of Renewable materials 2025年第4期13卷 669-685页

作者： Jiahao Liu Xinyu Zhang Huiwei Wang Yupeng Li Shan Jin Guanxian Qiu Ce Sun Haiyan Tan Yanhua Zhang Key Laboratory of Bio-Based Material Science&Technology Northeast Forestry UniversityMinistry of EducationHarbin150040China Northeast Forestry University Engineering Consulting and Design Research Institute Co. Ltd.Harbin150040China

In recent years,degradable materials to replace petroleum-based materials in preparing high-performance foams have received much research *** polymer foaming mostly uses supercritical fluids,especially carbon dioxide(Sc-CO_(2)).The main reason is that the foams obtained by Sc-CO_(2) foaming have excellent performance,and the foaming agent is green and *** current research,Poly(butylene adipate-co-terephthalate)(PBAT),poly(lactic acid)(PLA),and other degradable polymers are generally used as the main foaming materials,but the foaming performance of these degradable polyesters is poor and requires *** this work,10%PLA was added to PBAT to enhance the melt strength and improve the foaming *** improve the foaming properties of the PBAT/PLA composites,two kinds of nano-filler(nano-Fe_(3)O_(4) and carbon nanotubes(CNTs))were innovatively introduced for foaming *** was a synergistic effect between the two nano-fillers to enhance the foaming properties *** 6 wt%CNTs and 4 wt%nano-Fe_(3)O_(4) were added,the 4Fe_(3)O_(4)/6CNT foam had the best comprehensive *** foaming rate reached 14.8 times,which was 2.8 and 2.1 times that after adding 10 wt%CNTs or 10 wt%nano-Fe_(3)O_(4) *** combined action could adjust the melt elasticity of different PBAT/PLA composites to the *** nanofillers also served as skeleton structures to support the foam cells,significantly improving the foaming *** density and foaming ratio did not change significantly at 14 days after *** compressive strength of the composite foam reached up to 0.27 MPa and the water contact angle reached 120.1°.The synergistic foaming effect of nano-Fe_(3)O_(4) and CNTs could significantly improve the Sc-CO_(2) foaming performances of the composites,providing a new method for degradable materials to replace petroleum-based materials.

关键词： Poly(lactic acid) poly(butylene adipate-co-terephthalate) supercritical carbon dioxide

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