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Hierarchically porous cellulose nanofibril aerogel decorated with polypyrrole and nickel-cobalt layered double hydroxide for high-performance nonenzymatic glucose sensors

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Frontiers of Chemical Science and Engineering 2023年第10期17卷 1593-1607页

作者： Xuanze Li Wenyan Tian Caichao Wan Sulai Liu Xinyi Liu Jiahui Su Huayun Chai Yiqiang Wu College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha 410004China Department of Hepatobiliary Surgery Hunan Provincial People’s HospitalChangsha 410000China

With increasing emphasis on green chemistry,biomass-based materials have attracted increased attention regarding the development of highly efficient functional ***,a new pore-rich cellulose nanofibril aerogel is utilized as a substrate to integrate highly conductive polypyrrole and active nanoflower-like nickel-cobalt layered double hydroxide through in situ chemical polymerization and *** ternary composite can act as an effective self-supported electrode for the electrocatalytic oxidation of *** the synergistic effect of three heterogeneous components,the electrode achieves outstanding glucose sensing performance,including a high sensitivity(851.4μA·mmol^(−1)·L·cm^(−2)),a short response time(2.2 s),a wide linear range(two stages:0.001−8.145 and 8.145−35.500 mmol·L^(−1)),strong immunity to interference,outstanding intraelectrode and interelectrode reproducibility,a favorable toxicity resistance(Cl^(‒)),and a good long-term stability(maintaining 86.0%of the original value after 30 d).These data are superior to those of some traditional glucose sensors using nonbiomass *** determining the blood glucose level of a human serum,this electrode realizes a high recovery rate of 97.07%–98.89%,validating the potential for highperformance blood glucose sensing.

关键词： cellulose nanofibril aerogel nickel-cobalt layered double hydroxide polypyrrole nonenzymatic glucose sensor

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Preparation of cellulose nanofibrils by Multi-Site Regioselective Oxidation

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Journal of Renewable Materials 2020年第10期8卷 1269-1282页

作者： Liying Song Xixiang Pei Rui Li Haitao Chen Xiaozheng Sun College of Engineering Northeast Agricultural UniversityHarbin150030China Harbin Botai Biological Technology Co. Ltd.Harbin150030China

cellulose nanofibrils(CNFs)are promising sustainable materials that can be applied to nanocomposites,as well as medical and life-sciences ***,methods for the preparation of these important materials are energy intensive because heating and mechanical disintegration are required to produce cellulose fibers below 100 nm in *** this study,CNFs were prepared through the multi-site regioselective oxidation of cellulose with 2,2,6,6-tetramethylpiperidine-1-oxyl(TEMPO)and periodate at room temperature(20–25°C),without any mechanical-disintegration *** electron microscopy(TEM)revealed that the CNFs had the average widths of 14.1,55.4,and 81.9 nm for three different ***-transform infrared spectroscopy revealed that carboxyl groups were created on the surfaces of the microfibrils,while X-ray diffraction studies showed that the cellulose I structure was maintained after oxidation,and that the cellulose nanofibril crystallinity index exceeded 70%.These results demonstrate that CNFs can be prepared by multi-site regioselective oxidation at room temperature in the absence of mechanical disin*** addition,a model was developed to calculate the total content of carboxylate and aldehyde groups of CNFs prepared by the TEMPO mediate oxidation,the periodate oxidation,and the multi-site regioselective oxidation methods based on the particle width determined by *** calculated values of the model were in good agreement with the total content(experimental value)of carboxylate and aldehyde groups of CNFs prepared by the TEMPO-mediated oxidation and the multi-site regioselective oxidation ***,the model was not valid for CNFs prepared by the periodate oxidation method.

关键词： cellulose nanofibril multi-site regioselective oxidation total content of carboxylate and aldehyde groups particle width

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Flexible conductive Ag nanowire/cellulose nano?bril hybrid nanopaper for strain and temperature sensing applications

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Science Bulletin 2020年第11期65卷 899-908,M0003页

作者： Rui Yin Shuaiyuan Yang Qianming Li Shuaidi Zhang Hu Liu Jian Han Chuntai Liu Changyu Shen Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China China Astronaut Research and Training Center Beijing 100094China Technology Development Center for Polymer Processing Engineering Guangdong Colleges and UniversitiesGuangdong Industry Technical CollegeGuangzhou 510641China

With the rapid development of smart wearable devices, flexible and biodegradable sensors are in urgent needs. In this study, ‘‘green" electrically conductive Ag nanowire (Ag NW)/cellulose nanofiber (CNF) hybrid nanopaper was fabricated to prepare flexible sensors using the facial solution blending and vacuum filtration technique. The amphiphilic property of cellulose is beneficial for the homogeneous dispersion of Ag NW to construct effective electrically conductive networks. Two different types of strain sensors were designed to study their applications in strain sensing. One was the tensile strain sensor where the hybrid nanopaper was sandwiched between two thermoplastic polyurethane (TPU) films through hot compression, and special micro-crack structure was constructed through the pre-strain process to enhance the sensitivity. Interestingly, typical pre-strain dependent strain sensing behavior was observed due to different crack densities constructed under different pre-strains. As a result, it exhibited an ultralow detection limit as low as 0.2%, good reproducibility under different strains and excellent stability and durability during 500 cycles (1% strain, 0.5 mm/min). The other was the bending strain sensor where the hybrid nanopaper was adhered onto TPU film, showing stable and recoverable linearly sensing behavior towards two different bending modes (tension and compression). Importantly, the bending sensor displayed great potential for human motion and physiological signal detection. Furthermore, the hybrid nanopaper also exhibited stable and reproducible negative temperature sensing behavior when it was served as a temperature sensor. This study provides a guideline for fabricating flexible and biodegradable sensors.

关键词： Ag nanowire cellulose nanofibril Nanopaper Strain Temperature sensor

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Conductive polypyrrole incorporated nanocellulose/MoS_(2)film for preparing flexible supercapacitor electrodes

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Frontiers of Materials Science 2021年第2期15卷 227-240页

作者： Qi YUAN Ming-Cuo MA Research Center of Biomass Clean Utilization Beijing Key Laboratory of Lignocellulosic ChemistryCollege of Materials Science and TechnologyBeijing Forestry UniversityBeijing 100083China

Conductive films have emerged as appealing electrode materials in flexible supercapacitors owing to their conductivity and mechanical ***,the unsatisfactory electrode structure induced poor output performance and undesirable cycling stability limited their ***,a well-designed film was manufactured by the vacuum filtration and in-situ polymerization method from cellulose nanofibrils(CNFs),molybdenum disulfide(MoS_(2)),and *** electrode presented an outstanding mechanical strength(21.3 MPa)and electrical conductivity(9.70 S cm^(-1)).Meanwhile,the introduce of hydrophilic CNFs induced a desirable increase in diffusion path of electrons and ions,along with the synergistic effect among the three components,further endowed the electrode with excellent specific capacitance(0.734 F·cm^(-2))and good cycling stability(84.50%after 2000 charge/discharge cycles).More importantly,the flexible all-solid-state symmetric supercapacitor delivered a high specific capacitance(1.39 F·cm^(-2)at 1 mA·cm^(-2))and a volumetric energy density(6.36 mW·h·cm^(-3)at the power density of 16.35 mW cm^(-3)).This work provided a method for preparing composite films with desired mechanical and electrochemical performance,which can broaden the high-value applications of nanocellulose.

关键词： cellulose nanofibril molybdenum disulfide polypyrrole flexible supercapacitor

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Effect of Ultra-Turrax on Nanocellulose Produced by Acid Hydrolysis and Modified by Nano ZnO by Sol-Gel Method

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Materials Sciences and Applications 2020年第2期11卷 150-166页

作者： Amanda Ramos Aragao Melo Jose Carlos Dutra Filho Roberto Pinto Cucinelli Neto Wellington Silva Ferreira Braulio Soares Archanjo Raphael Verdan Curti Maria Ines Bruno Tavares Instituto de Macromoléculas Professora Eloisa Mano Universidade Federal do Rio de JaneiroBl J do Centro de TecnologiaIlh do FundaoRio de JaneiroRJBrasil Instituto SENAI de Inovacao em Biossintéticos e Fibras Universidade Federal do Rio de JaneiroRio de JaneiroBrasil Instituto de Biofísica Carlos Chagas Universidade Federal do Rio de JaneiroRio de JaneiroBrasil Divisao de Metrologia de Materiais Instituto Nacional de MetrologiaQualidade e Tecnologia(INMETRO)Duque de CaxiasBrasil

cellulose nanocrystals (NCC) and cellulose nanofibrils (CNF) were obtained by a single step process, with synergy between 64% sulfuric acid hydrolysis and high shear from ultra-turrax stirring, which is an advantageous process for disintegrating cellulose microcrystalline and also may improve the hydrolysis process. The surface modification on the cellulose was performed by the sol-gel process, in which the sulfate groups from hydrolysis were replaced by nanoparticles of zinc oxide, which led to the increase of up to 54°C Tonset, according to thermogravimetric analysis (TGA) results. The morphology and crystallinity degree were characterized by Helium Ion Microscopy (HIM), atomic force microscopy (AFM) and X-ray diffraction. In addition, the ZnO band was observed in Fourier transform infrared spectroscopy, furthermore, the change in the zeta potential confirmed the cellulose modification. The changes in the values of proton spin-spin relaxation time for the systems showing the confined hydrogen in the rigid domains, confirmed the results observed with the aforementioned techniques, for both cellulose after hydrolysis and ZnO modified cellulose, suggesting that ZnO disrupted crystal formation in cellulose.

关键词： cellulose Nanocrystal cellulose nanofibril Nano Zinc Oxide Acid Hydrolysis Sol-Gel

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