INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Xiaohong Liu,Hui Zhang,Juanli Shen,Bingyun Li,Shiyu Fu
Recently, cellulose-based stimuli-responsive nanomaterials have received significant attention because of its natural source and biocompatibility. In this study, cellulose-graft-poly(nisopropylacrylamide)-co-2-methyl-acrylic acid 2-carbazol-9-yl-ethyl ester (cellulose-g-(PNIPAAm&PCz)) block polymers were successfully synthesized by homogeneous atom transfer radical polymerization (ATRP) in LiCl/ N , N -dimethylacetamide (DMAc) dissolution system. The block polymers showed different properties due to the different PCz content. The block polymer with low PCz content (cellulose-g-(PNIPAAm&PCz)1) was dispersed in water at 25 °C and self-assembled into micelles at 37 °C. On the other hand, the block polymer with high PCz content (cellulose-g-(PNIPAAm&PCz)2) was dissolved in DMF, THF, DMSO firstly, and dialyzed at 25 °C, 37 °C and 60 °C respectively to obtain the micelles. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) indicated that the distribution range of micelles formed by cellulose-g-(PNIPAAm&PCz)1 was narrower than cellulose-g-(PNIPAAm&PCz)2. And the sizes of the micelles formed by cellulose-g-(PNIPAAm&PCz)2 had little difference under different solvents, but became bigger with the temperature increased. The micelles displayed thermo-enhanced fluorescence due to the thermal-driven chain dehydration of the grafted PNIPAAm brushes, which is contrary to the decrease of the fluorescence of the monomer when the temperature increased. The results provided a potential for the application of cellulose-based stimuli-responsive micelles in the field of drug delivery and fluorescent probes .
研究领域:
材料科学
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生物医学工程
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高分子化学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Haosheng Xiang,Bochu Wang,Mengqiu Zhong,Wenguang Liu,Dehai Yu,Yilong Wang,Kam C. Tam,Guofu Zhou,Zhen Zhang
Paper-based materials have been widely used in packaging replacing nonbiodegradable fossil-based polymers due to the increasing concerns on environmental pollution. However, paper is hygroscopic and its mechanical strength is dramatically reduced in the presence of moisture. The current hydrophobic modification of paper via nonbiodegradable polymer coating hinders the recycling of paper. A sustainable approach was proposed to prepare superhydrophobic cellulose nanocrystals (CNCs) by anchoring octadecylamine (ODA) on the surface of CNCs via the self-polymerization of tannic acid and Michael addition/Schiff base reaction between polytannic acid-coated CNCs (PTA@CNCs) and ODA. The obtained ODA–PTA@CNCs could be well dispersed in ethanol and sprayed onto different substrates to form superhydrophobic coatings, such as paper, cotton, and polyurethane. The outstanding superhydrophobicity of ODA–PTA@CNCs is attributed to the low surface energy of ODA and multiscale roughness of CNC nanorods. The promising applications of ODA–PTA@CNCs in waterproof paper-based packaging, antifouling and breathable textile, semipermeable membrane, oil–water separation, Janus paper, and actuators were demonstrated. Furthermore, the durability of superhydrophobic ODA–PTA@CNCs was confirmed by abrasion and washing tests. Overall, ODA–PTA@CNCs are promising sustainable and versatile hydrophobic coatings due to their facile preparation, biodegradability, convenience, and durability.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Wei Fan,Zhaolu Wang,Xiao Yu,Jiaqi Li,Yan Xu
Depolarizer is an important optical element for high-precision fiber optic gyroscopes in space and long-haul and high-bit-rate fiber transmission optical communication. Carboxylated cellulose nanocrystals prepared by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation prefer to form free-standing films with nematic-like mesostructures whose potential for optical application remains underexploited. Herein, we show that carboxylated cellulose nanocrystals by hydrochloride acid hydrolysis and TEMPO-mediated oxidation self-assemble into nematic-like mesophase that is capable of depolarizing both linearly and circularly polarized light in the visible region. By tuning the carboxylate content at retained fiber aspect ratio, the optimal carboxylated cellulose nanocrystal films to depolarize the visible linearly polarized light with the minimal degree of depolarization of ca. 4% are realized. We present the experimental evidence that birefringent microdomains with substantial variation in the size and orientation acting as numerous waveplates are responsible for the depolarization performance. Finally, we demonstrate how carboxylated cellulose nanocrystal films capable of depolarizing broadband visible circularly polarized light can be leveraged for encrypted patterning.
研究领域:
材料科学
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光学工程
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纳米技术
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DOI
高影响因子
Heritage Science
·
2020
·Vol. 8
·期 1
·1-9
·
IF 1.902
Jia Zhihui,Li Jing,Li Yuhu,Qi Yunpeng,Hu Daodao,Xing Huiping,Chao Xiaolian
Microbubble disease observed in cellulose acetate microfilm is accompanied by the production of vinegar syndrome, which affects the image integrity. In the present study, samples of cellulose acetate microfilm with microbubble disease were selected to investigate potential treatment methods. Samples were sourced from the Republic of China (AD 1912–1949) microfilm collections held in the Second Historical Archives of China. A combination of optical microscopy and a stainless-steel needle was used to remove plasticizer exudation within microbubbles. The plasticizer was effectively removed by infiltrating butan-1-ol into the microbubble from a small hole made by the stainless-steel needle. SEM and confocal microscopy were used to study the morphology and roughness of the internal surface of the microbubbles. It was found that the blurry image could be attributed to light scattering from the rough surface. Ethyl cellulose was used to fill the interior of the microbubble to obtain a clearer image. To determine the protective potential of this filling material, the chemical and mechanical properties of coated film after dry heat, hygrothermal and UV accelerated ageing were measured. Based on the above-mentioned results, it is encouraging that a new microrepair method and its corresponding method are offered in film treatment work.
研究领域:
文物保护
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材料科学
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化学
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DOI
高影响因子
Polymers
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2016
·Vol. 8
·期 4
·129
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IF 2.944
Bo Wang,Dan Yang,Hai-rong Zhang,Chao Huang,Lian Xiong,Jun Luo,Xin-de Chen
Bacterial cellulose (BC) has great potential to be used as a new filler to reinforce isotactic polypropylene (iPP) due to its high crystallinity, biodegradability, and efficient mechanical properties. In this study, esterification was used to modify BC, which improved the surface compatibility of the iPP and BC. The results indicated that the cellulose octoate (CO) changed the surface properties from hydrophilic to lipophilic. Compared to the pure iPP, the tensile strength, charpy notched impact strength, and tensile modulus of the iPP/BC composites increased by 9.9%, 7.77%, and 15.64%, respectively. However, the addition of CO reinforced the iPP/CO composites. The tensile strength, charpy notched impact strength, and tensile modulus of the iPP/CO composites increased by 14.23%, 14.08%, and 17.82% compared to the pure iPP. However, the elongation at break of both the composites is decreased. The SEM photographs and particle size distribution of the composites showed improvements when the change of polarity of the BC surface, interface compatibility, and dispersion of iPP improved.
研究领域:
材料科学
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聚合物复合材料
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生物聚合物
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纳米材料
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Youjie Gao,Guozhuo Chen,Chao Wu,Junjie Zhou,Guojun Jin,Hou-Yong Yu
The widespread use of plastic packaging has improved convenience in daily life but has also led to serious environmental pollution. Therefore, an eco-friendly biodegradable material is needed to replace plastic packaging. In this study, the cellulose packaging materials were first time prepared by Thioctic acid (TA) driven chemical cross-linking with cellulose chains. Cellulose films with optimized concentrations of TA exhibited higher mechanical strength (126 MPa), hydrophobicity (99.7°), and barrier properties. The cross-linking of TA resulted in an orderly arrangement of cellulose molecules. Meanwhile, the cellulose film could effectively slow down evaporation of water from fruit (tomatoes) and extended food's shelf life for packaging applications, which is equivalent to commercial preservative film (polyethylene). This study presents a novel and scalable strategy for fabricating cellulose-based packaging materials with improved functional properties, offering a promising alternative to conventional plastic packaging.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Mingchen Yang,Yi Chen,Somia Yassin Hussain Abdalkarim,Xuefei Chen,Hou-Yong Yu
The performance of cellulose-based materials is highly dependent on the choice of solvent systems. Exceptionally, cellulose dissolution and derivatization by efficient solvent have been considered as a key factor for large-scale industrial applications of cellulose. However, cellulose dissolution and derivatization often requires harsh reaction conditions, high energy consumption, and complex solubilizing, resulting in environmental impacts and low practical value. Here we address these limitations by using a low-temperature oxalic acid/sulfuric acid solvent to enable cellulose dissolution and derivatization for high-performance cellulose films . The dissolution and derivatization mechanism of the mixed acid is studied, demonstrating that cellulose is firstly socked by oxalic acid , then more hydrogen bonds ionized by sulfuric acid break cellulose chain, and finally the esterification reaction between oxalic acid and cellulose is catalyzed by sulfuric acid. Solutions containing 8 %–10 % cellulose are obtained and can be stored for a long time at −18 °C without significant degradation. Moreover, the cellulose film exhibits a higher tensile strength of up to 66.1 MPa, thermal stability, and degree of polymerization compared to that fabricated by sulfuric acid. These unique advantages provide new paths to utilize renewable resources for alternative food packaging materials at an industrial scale.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 4
·1876-1882
·
IF 9.3
Xianqing Lv,Chengke Zhao,Xiwei Zhang,Zhuotong Wu,Li Shuai
Nanocellulose has attracted attention from the scientific community due to its biodegradability and unique physiochemical characteristics. However, the production of high-quality nanocellulose is still limited by the high cost of chemical usage, purification, and energy consumption. In this work, we proposed a catalytic aerobic process for preparing aldehyde-functionalized cellulose nanocrystals by oxidizing cellulose in a triisopropoxy vanadium (VO(OiPr)3)/O2 system and investigated the mechanism of selective oxidation of cellulose in this system. Well-dispersed cellulose nanocrystals with a diameter of approximately 100 nm and an aldehyde content of 0.425 mmol g−1 were obtained under the conditions of 120 °C, 4 MPa O2 pressure, and a 12 h reaction time. The catalyst employed in the oxidation process still retained high activity after being reused four times. This research presents an alternative strategy for the preparation of cellulose nanocrystals with limited chemical usage, which would contribute to the development of environmentally friendly and cost-effective processes for nanocellulose production.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 3
·1393-1406
·
IF 3.917
Shi Junhua,Liu Wenyong,Jiang Xinman,Liu Wenliang
Abstract The brittleness of ethyl cellulose (EC) film limited its full applications, and the addition of plasticizers is one of the most common methods to reduce its brittleness. However, the mechanical properties are normally dropped with the addition of plasticizers. Herein, cellulose nanocrystal (CNC) was chosen as a reinforcing agent to improve its mechanical properties. CNC was firstly extracted from the tobacco-stem and then modified by epoxidized soybean oil (ESO) via ring-opening grafting to obtain epoxidized soybean oil grafting CNC (ECNC). The grafting effect was evaluated by FTIR and XPS. After that, the films of ECNC/EC nanocomposites were prepared by the solution-casting method, and their mechanical, thermal and optical properties and fracture morphology were investigated. The results showed that at 4 phr loading of ECNC, the tensile strength of the nanocomposite film was up to 43.7 Mpa (about twice as much as that of the EC film plasticized by ESO), and the elongation at break was not influenced. Moreover, a higher thermal decomposition temperature was achieved for the ECNC/EC films. Besides, owing to the good dispersion, ECNC had no significant impact on the transparency, and the films presented high light transmittance in the visible light region. Graphic abstract
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingyi Nie,Jianfei Liao,Tintin Jiao,Binron Sun,Meiyun Zhang,Ruiting Yang,Yueqing Li
The health impacts of air pollution such as particulate matter (PM) and bioaerosols have prompted a focus on the utilization of personal protective filters. Traditional filters pose environmental concerns due to their non-biodegradable composition, while cellulose presents a promising alternative for biodegradable air filtration applications. This research involved the development of cellulose filter substrates with a customizable pore structure by adjusting the nanofiber content in cellulose filters and employing a simultaneous freeze-drying method. By integrating chitosan and CuO nanoparticles, the filters gained electrostatic adsorption capabilities, leading to a substantial enhancement in filtration efficiency, as well as imparting moisture resistance and durable antimicrobial properties to the filter. Subsequently, a three-layer cellulose filter integrated with chitosan and CuO (abbreviated as Int-Cs&CuO) was constructed based on the generalized Murray’s law to enable multi-stage PM filtration. The Int-Cs&CuO cellulose filter demonstrated filtration efficiencies of 99.2 % for non-oily PM 0.3 and 99.5 % for oily PM 0.3 , with a low pressure drop of 49.5 Pa. Under humid conditions, the filtration efficiency of the Int-Cs&CuO cellulose filter against PM 0.3 particles was minimally impacted, showcasing a decrease of only 1.3 %. Notably, the filter exhibited complete biodegradation in composted soil within approximately 2 months.
研究领域:
环境科学
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材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Bai-Chuan Lu,En-Jiang Liu,Shi-Wen Guo,Zheng-Feng Zhang,Chen-Man Zong,Peng Song,Xiao-Hui Yao,Wei-Guo Zhao,Tao Chen,Dong-Yang Zhang
In recent years, flexible-hydrogel wearable devices have undergone rapid development while photothermal therapy, energy storage/conversion, and other fields have been widely developed and used. However, the poor mechanical properties of hydrogels can affect their stability and reliability in practical applications, and it is often difficult to achieve both excellent mechanical properties and multifunctional characteristics. This study prepared a hierarchical cellulose network/PVA multifunctional composite hydrogel (MCPH) using cellulose nanofiber as fine fibers and microfibrillated cellulose as coarse fibers. The hierarchical cellulose network provides tensile strength as a skeleton while the PVA serves as the soft matrix to assist energy dissipation, which provides the composite hydrogel with good mechanical properties (toughness of 1.21 MJ m −3 and tensile modulus of 2.20 MPa). In addition, owing to hierarchical cellulose network preventing excessive stacking of MXene while achieving stable series connection of nano fillers, MCPH exhibits excellent photothermal conversion rate, photothermal antibacterial ability (viability of Escherichia coli and Staphylococcus aureus < 0.88 %), and energy storage capacity (6886 mF/cm 2 ). Thus, this study not only prepared a composite hydrogel with good mechanical properties and excellent multifunctional properties but also expanded the application potential of cellulose, an important green renewable plant resource, in high-value-added wearable products.
研究领域:
材料科学
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生物医学工程
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能源科学
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产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 7
·4151-4164
·
IF 5.044
Sun Tingting,Wang Huimin,Liu Jiaye,Chu Xiaomeng,Xing Xuteng,Liu Shaojie,Tang Erjun,Liu Xinying,Hildebrandt Diane
In this work, a recoverable acrylamide-vinylamine copolymer immobilized TEMPO [P(AM-co-VAm)-T] catalyst for selective oxidation of cellulose with good catalytic performance and low cellulose degradation was developed. Firstly, the acrylamide-vinylamine copolymer [P(AM-co-VAm)] was prepared by Hofmann degradation of polyacrylamide (PAM). Then, the condensation reduction reaction between amine groups of P(AM-co-VAm) and carbonyl groups of 4-oxo-TEMPO yielded P(AM-co-VAm)-T. P(AM-co-VAm)-T was used as a catalyst for selective oxidation of C6 primary hydroxyl groups of cellulose to carboxyl groups. The carboxyl content of obtained oxidized cellulose was up to 1.114 mmol/g, which was equivalent to 76% of the free TEMPO level. This macromolecular catalyst was easily recycled and the recycling performance was excellent. Interestingly, it was found that P(AM-co-VAm)-T could effectively reduce the degradation of oxidized cellulose. The corresponding degradation degree was 21–27%, which was much lower than the degradation degree of free TEMPO (61–66%) and other macromolecular TEMPO catalysts, such as polyacrylic acid immobilized-TEMPO (41–53%) and polyamidoamine supported TEMPO (28–44%). P(AM-co-VAm)-T with positive charge and suitable size could effectively inhibit the formation of C6 aldehydes and C2/C3 ketones, which was the main reason that it could significantly inhibit cellulose degradation.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）