CARBOHYDRATE POLYMERS
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2022
·
IF 10.723
Jun Wan,Rong Hu,Junfeng Li,Shiyun Mi,Jinglin Xian,Zhiheng Xiao,Ziyang Liu,Aojie Mei,Siqi Xu,Mingzhao Fan,Huiyu Jiang,Qian Zhang,Huihong Liu,Weilin Xu
Conductive polymer (CP) fabric is considered as the ideal electrode for flexible energy storage due to its light weight, good flexibility and high energy storage properties. However, the conventional polymer-coated cellulose fiber synthesized by liquid-phase oxidation polymerization always forms disordered assembly of polymer particles on fiber, which endures poor mechanical stability. Here, we report a two-dimensional (2D) CP based fabric electrode realized by a salt-template assisted vapor-phase polymerization method, which achieves robust coating of 2D CP on various cellulose fibers. Typically, the prepared 2D polypyrrole@cotton electrode displays a high specific capacitance (902.6 mF cm −2 ) and good cycling stability (86.5% capacitance retention after 12,000 cycles). The capacitance of flexible symmetrical device retains at more than 90% when it is bent to 180° after 1000 bending cycles. This work provides a new strategy for the robust interface between functional materials and cellulose fibers, and has great potential for commercial mass production.
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CARBOHYDRATE POLYMERS
·
2022
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IF 10.723
Zhonglei Huang,Guang Yu,Chao Liu,Meiyan Wu,Yanjun Tang,Bin Li,Hui Peng
The development of sustainable and effective pretreatment methods to improve the accessibility of cellulose is of vital importance for its utilization. Herein, a novel high-efficiency pretreatment method based on lithium bromide trihydrate (LBTH) was established, which realized the fast improvement of cellulose accessibility under ambient conditions without dissolution of cellulose. The cellulose I structure of microcrystalline cellulose (MCC) was transformed into amorphous structure just within 5 min of LBTH pretreatment, and the crystallinity was reduced from 79.1 to 19.9%. After pretreatment for 30 min, the BET surface area of MCC increased from 2.1 to 125.9 m 2 /g. Particularly, the pretreated cellulose could be near-completely saccharified to glucose (98.3%) with ultra-low enzyme dosage (2.5 mg protein/g-glucan) just within 24 h, while the conversion of untreated MCC under the same conditions was only 16.7%. Additionally, this non-dissolving pretreatment is beneficial to the separation and recycling of LBTH, guaranteeing a clean and sustainable process.
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ACS Applied Electronic Materials
·
2022
·
IF 4.494
Yingjie Huo,Dan Guo,Jialu Yang,Yukai Chang,Bochong Wang,Congpu Mu,Jianyong Xiang,Anmin Nie,Kun Zhai,Tianyu Xue,Fusheng Wen
Polypyrrole has attracted more and more attention due to its low density, high conductivity, and excellent electro/photothermal conversion ability. However, the poor mechanical properties of polypyrrole limit its further application. In this work, mechanically flexible bacterial cellulose nanofibers/polypyrrole (BC@PPy) composite films were fabricated by in situ polymerization and vacuum filtration. The addition of BC improved the mechanical properties of PPy and made it have good tensile and bending capacity. The conductivity of BC@PPy films could be tuned by the polymerization time of pyrrole. The BC@PPy-6 h film displayed excellent low-voltage-driven Joule heating (up to 95.4 °C at 5 V) and high-efficiency photothermal conversion (up to 52.4 °C under 100 mW/cm2) performance. Moreover, the resultant BC@PPy-6 h film also showed outstanding electromagnetic interference (EMI) shielding effectiveness of exceeding 28.5 dB in the whole X band. Therefore, the multifunctional BC@PPy films possess high application prospects in wearable electrical devices for Joule heating, photothermal conversion, and EMI shielding.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2022
·Vol. 105
·期 8
·5461-5471
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IF 4.186
Hongli Hu,Hangyu Zhong,Bo-xing Zhang
As applications of porous ceramic materials have gradually expanded, the novel technologies for the fabrication of porous ceramic materials with a delicate and controllable structure are still attractive. In this work, three types of porous monolithic ceramic materials, including Al 2 O 3 –SiO 2 , TiO 2 , and SiC, have been fabricated by thermally impacted and non-solvent-induced phase separations in blends of cellulose acetate and ceramic nanoparticles. These materials possessed three-dimensional interconnected porous structures with low densities, high porosities, and hierarchical pores ranging from 5 nm to 6 μm. The relationships between microstructures and phase separations were systematically investigated. Furthermore, electromagnetic shielding effectiveness of 20 dB from 5 to 18 GHz in porous SiC materials has been achieved, revealing that those materials have potential applications in the electromagnetic shielding. This work provides a powerful and general approach to fabricate porous monolithic ceramic materials with a wide range of various ceramic nanoparticles.
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CATALYSIS LETTERS
·
2022
·Vol. 153
·期 1
·248-259
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IF 2.936
Liu Yi,Chen Ying,Zhi Yunfei,Yu Xiaojian,Wang Pengfei,Wang Shouhong,Shan Shaoyun
In this work, by loading a chromium Salen complex on amino-functionalized cellulose (AFC-SalenCr), a novel and efficient heterogeneous catalyst was successfully synthesized, and used for the copolymerization of sulfur dioxide (SO 2 ) with cyclohexene oxide for the first time. The catalysts were characterized by FTIR, XPS, ICP-MS and TGA for their physiochemical and thermal properties. The as-prepared AFC-SalenCr showed high catalytic activity for the copolymerization. Under optimal reaction conditions, the molecular weight of the resultant copolymer could reach 40,100 g/mol. Moreover, the catalyst was able to recover facilely and be reused for four cycles without any significant activity loss. In addition, the thermal degradation kinetics of the synthesized copolymer was further studied using Kissinger and Flynn–Wall–Ozawa methods for the first time, which indicated that the activation energy of the thermal degradation was 92.8 kJ/mol and 94.0 kJ/mol, respectively. Graphical Abstract
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Advanced Composites and Hybrid Materials
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2022
·Vol. 5
·期 2
·1078-1089
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IF 11.806
Liu Kun,Liu Wei,Li Wei,Duan Yaxin,Zhou Keyu,Zhang Shu,Ni Shuzhen,Xu Ting,Du Haishun,Si Chuanling
Recently, the rapid popularization of modern communication technologies represented by 5G will inevitably aggravate the deterioration of the electromagnetic environment. Electromagnetic interference (EMI) and electromagnetic radiation have more and more serious impacts on human production and life, and EMI shielding materials have emerged as the times require. Herein, we reported a cellulose nanofibril/silver nanowire (CNF/AgNW) nanopaper, manufactured through a step-by-step (SbS) self-assembly process, which has a unique layered structure and improved two-sidedness. The results showed that the obtained AgNWs have an ultra-high aspect ratio (up to 2857), which enabled them to form conductive paths in nanopaper at low addition levels (0.5 wt.%). When the AgNW content was 5.0 wt.%, the obtained nanopaper with a thickness of ~ 50 μm exhibited an excellent tensile strength of ~ 98.6 MPa and a high conductivity of ~ 1673 S/cm. The unique layered structure of CNF/AgNW nanopaper and the excellent synergistic interaction between CNF and AgNWs enabled the optimized CNF/AgNW nanopaper to exhibit a high EMI shielding effectiveness (SE) of up to 67.27 dB in the X band. Therefore, this strong and highly conductive CNF/AgNW nanopaper is expected to broaden new application areas including smart clothing, wearable electronic devices, and other emerging applications. Graphical abstract A strong and highly conductivity cellulose nanofibrils/silver nanowires (CNF/AgNWs) nanopaper has been manufactured through the step-by-step self-assembly process. Abundant conductive network and special interlayer structure make the CNF/AgNWs nanopaper holds high EMI shielding performance at a low thickness.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Jing Hu,Zhenjun Xiong,Yuqing Liu,Jinyou Lin
Conventional petroleum-based synthetic polymeric fiber filter materials for separation may cause secondary pollution to the environment due to their non-degradable properties. Herein, we report a facile method of preparation of a biodegradable composite filter that can achieve filtration for air by underlaying the commercialized cellulose paper towel under electrospun zein fibers. The morphology of zein fibers was successfully steered via varying the weight ratios of ethanol/deionized water mixture solvent, as a result, the round or flat ribbon fibers were obtained. The effect of zein fiber morphology on air filtration performance was investigated both experimentally and theoretically. It was found that the flat ribbon fiber filter had a higher filtration efficiency (99%) for PM0.3 removal and a lower pressure drop (109 Pa) compared with the round zein fiber filter. Notably, the as-prepared composite filter can be biodegradable easily, contributing to green ecological environment. This work shows an efficient way to develop biodegradable filtration materials with the cheap price, easy availability of component materials, exhibiting a great potential application in air filtration area.
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BIOMASS & BIOENERGY
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2022
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IF 5.774
Gang Liu,Yujiao Xie,Chunjie Wei,Chang Liu,Feng Song,Xiuyu Sun,Yuan Zhang,Hongyou Cui
The one-pot approach was developed by using molten salt hydrate consisting of ZnCl 2 ·4H 2 O and LiCl·3H 2 O to produce 5-hydroxymethylfurfural (5-HMF) from cellulose . Cellulose was dissolved and regenerated to study the interaction of cellulose and molten salt hydrate. The effects of ZnCl 2 ·4H 2 O concentration, reaction time, and temperature on the conversion of cellulose to 5-HMF were investigated. 5-HMF yield increased when ZnCl 2 ·4H 2 O was mixed with LiCl·3H 2 O, and the maximum value (44.1%) was reached at 160 °C and 90 min when ZnCl 2 ·4H 2 O concentration was 64.9 mol%. The species of ZnCl 2 ·4H 2 O–LiCl·3H 2 O were analyzed, and the function of species concentration was correlated with the 5-HMF yield from the conversion of glucose and fructose. It was found that the synergistic catalysis of ZnCl 3 − , Zn 2+ , Zn(OH) + , H + as well as Li + promoted the efficiently cellulose conversion to 5-HMF.
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Foods
·
2022
·Vol. 11
·期 8
·1065
·
IF 5.561
Xiaotong Zhou,Liu Liu,Jianke Li,Lin Wang,Xueying Song
The utilization of industrial by-products is becoming more and more important for resource utilization. In this study, soluble dietary fiber (SDF) was extracted from Jerusalem artichoke residue, and a series of characterizations of SDF were carried out. The results showed that SDF had good properties. SDF (0%, 0.1%, 0.2%, 0.3%, and 0.4%) and chitosan (2%) were further used to prepare the coating that was used for the preservation of blueberry. The chemical structure of the film was obtained by FT-IR and XRD analysis. The microstructure of the film was analyzed by SEM, and the properties of the film were tested. The blueberry fresh-keeping test proved that the SDF-added film could effectively prolong the quality of blueberries in storage for 16 days. After 16 days of storage, compared with the control group, the decay rate of the coating group with 0.2% SDF decreased by 16.3%, the consumption of organic acids decreased by 43.7%, and the content of anthocyanin increased by 29.3%. SDF has a potential application in food preservation.Keywords:Jerusalem artichoke;soluble dietary fiber;blueberry
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Hanqing Yu,Jiajun Feng,Pengfei Tang,Shuaishuai Chen,Zhiqiang Wang,Zhongkai Wang,Feng Jiang
In this work, sustainable cellulose- g -poly(lauryl acrylate- co -acrylamide) [Cell- g -P(LA- co -AM)] bottlebrush copolymer elastomers derived from cellulose and plant oil were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. Differential scanning calorimeter (DSC) results indicate that these thermally stable Cell- g -P(LA- co -AM) bottlebrush copolymer elastomers show adjustable melting temperatures. Monotonic and cyclic tensile tests suggest that the mechanical properties, including tensile strength , extensibility, Young's modulus , and elasticity, can be conveniently controlled by changing the LA/AM feed ratio and cellulose content. In such kind of bottlebrush copolymer elastomers, the rigid cellulose backbones act as cross-linking points to provide tensile strength. The incorporated PAM segments can form additional network structure via hydrogen bonding, resulting in enhanced tensile strength but decreased extensibility when more PAM segments are introduced. This versatile strategy can promote the development of sustainable cellulose-based bottlebrush copolymer elastomers from renewable resources.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Fazli Wahid,Xue-Qing Zhao,Ji-Xiao Cui,Yun-Ya Wang,Feng-Ping Wang,Shi-Ru Jia,Cheng Zhong
Superhydrophilic/underwater superoleophobic (SUS) membrane technology has attracted extensive attention for water purification. However, the fabrication of multifunctional membranes to satisfy the complex wastewater treatment is still a big challenge. In this work, bacterial cellulose (BC) based multifunctional SUS membranes were designed for water purification. Membranes were prepared by blending BC nanofibers with TiO 2 nanoparticles (NPs), and further modified by the in situ growth of ZnO-NPs. The composite membranes showed oil/water (o/w) separation under a small driving pressure (0.2–0.3 bar) with a flux rate of 8232.81 ± 212 L m − 2 h −1 and with a high separation efficiency (>99.9%). Membranes could also separate oil-in-water emulsion with a separation flux of 1498 ± 74 L m − 2 h −1 and with high efficiency (99.25%). Moreover, the composite membrane exhibited photocatalytic activity under visible light with a high efficiency (>92%). The composite membranes were also investigated for antibacterial activity against Gram-positive and Gram-negative bacterial strains. This work may inspire the fabrication of next-generation multifunctional membranes for wastewater treatment, particularly oily wastewater, dyes and microbial contaminated water.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 13
·5311-5320
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IF 8.067
Dedong Wang,Minyue Zhang,Yan Guo,Tiantian Bai,Hu Liu,Chuntai Liu,Changyu Shen
Carbon-based aerogels have been widely accepted to be a type of promising electromagnetic microwave (EMW) absorber due to their merits of low density, high specific surface area, and a three-dimensional porous structure, but the contradiction between their strong dielectric loss capacity and poor impedance matching often results in a weak EMW absorption capacity. In this work, a cellulose derived carbon/BN composite aerogel (CCA/BN) was prepared by a simple freeze-drying and high-temperature pyrolysis process. Here, both the BN loading and pyrolysis temperature could directly affect the dielectric loss capacity of the prepared CCA/BN. Specifically, the abundant interfaces between BN and the carbon matrix and the pyrolysis-generated carbon defects contributed to the polarization loss, and the BN loading and pyrolysis temperature dependent electrical conductivity affected the conduction loss. More importantly, good impedance matching was achieved by adjusting the BN loading and pyrolysis temperature, enabling as much EMW as possible to enter the absorber to be dissipated. What's more, the porous structure also contributed to enhanced EMW absorption efficiency through multiple reflection/scattering inside the material. As a result, CCA/BN with 10 wt% BN and a pyrolysis temperature of 680 °C (CCA/BN10-680) exhibited a superior EMW absorption performance with a minimum RL value (RLmin) of −49.2 dB at 11.28 GHz and 3.75 mm thickness and a maximum effective absorption bandwidth (EABmax) of 8.16 GHz (9.68–17.84 GHz) at 3.45 mm thickness. This study provides a reliable reference for preparing a highly efficient biomass carbon based EMW absorber.
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