CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2021
·
IF 1.134
Qiong YUAN,Chen-Rui LIU,Yan-Li TANG
Conjugated polymers (CPs) attract a lot of attention in sensing, imaging, and biomedical applications by taking advantage of their extraordinary characteristics. However, most of them inevitably aggregate at higher concentrations, leading to attenuated fluorescence efficiency. Herein, we report a fluorescence enhancement strategy for conjugated polymers by using cellulose as a mediator. The composite nanoparticles CMC@PFE-1-NPs are prepared based on carboxymethyl cellulose (CMC) and poly(fluorene-co-phenylene ethynylene) derivative (PFE-1) via self-assembly through electrostatic and hydrophobic interactions. This spatial confinement effectively restricts π-π stacking effects and other nonradiative channels, leading to high luminescent efficiency of isolated PFE-1. A 5-fold enhancement in fluorescence quantum yield for CMC@PFE-1-NPs is obtained compared with conjugated polymers themselves. Furthermore, the nanoparticles realize more sensitive cell imaging. Therefore, this simple and effective method provides a new way for reducing the aggregation between rigid fluorescent molecules and improving their photophysical properties and biological application.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Qiuqin Lin,Shiqin Liu,Xueyuan Wang,Yuxiang Huang,Wenji Yu
The rise of smart textiles has increased the demand for conductive fibers and the common method to realize the conductivity of fibers is to add a layer of nano metal particles via electroless plating process. However, this conventional method often requires redundant pretreatment steps and chemical regents, which hinders the large-scale production of such conductive fibers. Here, we propose a facile one-step alkaline pretreatment to prepare ultra-conductive bamboo cellulose fibers (BCFs) via in-situ reduction of silver nanoparticles (Ag NPs). The Ag-coated BCF has a conductivity of 31,800 S m −1 and a tensile strength of 492 MPa. It also has outstanding flexibility, excellent mechanical stability and washing resistance, maintaining over 96% conductivity after 1000 bending cycles and over 96% Ag retention after 50 washing times. More importantly, this alkaline pretreatment method is suitable for various biomass materials such as wood fibers, and can realize the selective conductivity of materials. This facile, green and universal pretreatment method for preparing conductive biomass fibers is expected to achieve large-scale production and be widely used in the fabrication of smart textiles.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Zhengjiang Zhu,Qun Liu,Jionghua Xiang,Wuyin Weng,Yucang Zhang
Cellulose nanofiber (CNF) with an average diameter of 35.67 ± 0.23 nm was prepared from bamboo processing waste through a combination of enzyme-assisted ball milling and high-pressure homogenization. After modification with maleic anhydride (MA), neutral red (NR) was adsorbed onto the CNF-MA, and the resulting CNF-MA-NR films were prepared by vacuum filtration. The CNF-MA-NR film exhibited efficient NR immobilization, improved hydrophilicity, and satisfactory biocompatibility. The immobilized NR retained pH-responsive behavior with a broadened color transition range and showed rapid, reversible response to amine and acid vapors, along with good reusability. The films were biodegradable and showed stable color performance under low-temperature and dark storage without NR leakage. Correlation analysis using refrigerated shrimp confirmed that the film enabled real-time monitoring of shrimp freshness via a WeChat Mini Program. This work provided a sustainable approach for valorizing bamboo processing waste and demonstrates the potential of CNF in colorimetric sensing.
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高影响因子
CELLULOSE
·
2023
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IF 5.7
Shao Xinyi,Wang Jian,Yao Xinjie,Wang Yubo,Song Wenbao,Xu Dehua,Gao Yifei,Dong Cuihua
Ion-exchange fiber has been widely used as a conventional adsorbent for water purification, but its base material, the petroleum, does not comply with the current trend of environmental protection. The synthesis of functional materials from natural resources attracts intensive interest. Cotton lint fiber is a natural cellulose based hollow fiber, which has a unique advantage in ion-exchange process. Herein, for the first time, a cationic design for the cotton lint fiber was carried out in a simple two-step strategy. The cellulose based anion-exchange fiber (CAF) showed well-preserved fibrous macrostructure and cellulose nanofibril structure. And the ideal cationic group content (133.26 mmol·100 g −1 ) of it indicates the successful combination of structural and functional properties, which are the responsible for its excellent adsorption efficiency that includes the high adsorption capacity (above 1300 mg g −1 ), rapid adsorption rate (90% of its equilibrium uptake within 6 min at the initial concentration of 300 mg L −1 ), perfect solid/liquid separation property, and good recyclability (> 95%) for congo red. Additionally, the adsorption mechanism can be attributed to the synergistic effect of electrostatic attraction, hydrogen bonding, and van der Waals force, which was explained by the employment of classical adsorption models and advanced double layer statistical physical model. The results show that this functionalized biomaterial is an ideal candidate to replace the conventional anion-exchange fiber. This work not only revolutionizes the application of natural plant fiber, but also provides a cost-effective and simple strategy for the utilization of cellulose.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Wenfeng Zheng,Lingling Fan,Jiangang Zhou,Zhenghua Meng,Dezhan Ye,Jie Xu
Cellulose composite nanopaper is extensively employed in flexible energy storage systems owing to their light weight, good flexibility and high specific surface area. Nevertheless, achieving flexible and ultrathin nanopaper supercapacitors with excellent electrochemical performance remains a challenge. Herein, surface cationization of bacterial cellulose (BC) nanofibers was conducted using 2,3-epoxypropyltrimethylammonium chloride (EPTMAC). Anion-doped polypyrrole (PPy) was incorporated onto the surface of the cationic bacterial cellulose (BCE) nanofibers by an interfacial electrostatic self-assembly process. The obtained PPy@BCE electrode exhibited excellent electrochemical performance, including an areal capacitance of 3988 mF cm −2 at 1.0 mA cm −2 and a capacitance retention of 97 % after 10,000 cycles. A laminated paper-forming strategy was adopted to design and fabricate all-in-one integrated flexible supercapacitors (IFSCs) using PPy@BCE nanopaper as electrodes and BC nanopaper as a separator. The IFSCs showed superior areal capacitance (3669 mF cm −2 at 1 mA cm −2 ), high energy density (193.7 μWh cm −2 at a power density of 827.3 μW cm −2 ), and outstanding mechanical flexibility (with no significant capacitance attenuation after repeatedly bending for 1000 times). The present strategy paves a way for the large-scale production of paper-based energy storage devices.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaodong Hu,Shanshan Zhang,Bo Yang,Ming Hao,Zhijun Chen,Yanbo Liu,Xiaoxiao Wang,Jinbo Yao
Ambient drying is currently the cheapest and most efficient way to prepare aerogels, but it is invisible for the preparation of cellulose aerogels. In this paper, we describe a method of preparing cellulose aerogels that can be dried under atmospheric pressure by freeze-linking technique. The amino silane coupling agent forms an amino-rich polymer layer on the bacterial cellulose surface during the freezing process. And, the cross-linked network constructed by Schiff base reaction can strengthen the fiber skeleton in the process of solvent exchange. Due to the double cross-linked network structures, the cellulose ethanol gel can be dried directly under atmospheric pressure at 60 °C and the volume shrinkage can be as low as 3.3 %±1.4 %. In the process of solvent exchange, the loss of some polysiloxane causes defects in the aerogel, which not only reduces its thermal conductivity but also increases its specific surface area. And the water resistance, thermal performance, and dye adsorption performance of the aerogel are also significantly improved. This study provides a low-cost and high-efficiency solution for the manufacture of cellulose aerogels and promotes their wide applications.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 45
·31444-31456
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IF 3.3
Yiwei Zhu,Jian Kang,Die Gao,Bingtong Chen,Yi Nie,Hui Wang,Xiaowen Wu
Ionic liquid based technology is promising in the pretreatment of lignocelluloses. More efforts are still being made to intensify the separation of the main components in this biomass and to inhibit biopolymer degradation, especially in the fabrication of functional materials where excellent mechanical properties are often requisite. In this study, additives with amino and/or hydroxyl groups were proposed to improve the dissolution of lignocellulosic biomass in ionic liquids and to inhibit the degradation of cellulose. Among the tested additives (i.e., urea, L-2-aminobutyric acid, DL-aminopropanol, 3-aminopropanol and ethanolamine), 3-aminopropanol showed the best performance in enhancing wheat straw dissolution and cellulose recovery in 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac). Further study revealed that this additive could also inhibit cellulose degradation in [EMIM]Ac. The interactions between the ionic liquid and additive were revealed by NMR and IR analysis. It was found that the formation of hydrogen bonds between 3-aminopropanol and [EMIM]Ac changed the interactions between ionic liquids and biomass, resulting in improved dissolution efficiency and inhibition of cellulose degradation. Optimization investigation showed that when using the 3-aminopropanol/[EMIM]Ac composite system as the solvent and pine as the raw biomass, the cellulose content in the recovered cellulose-rich material was increased from 33.3% (for the raw pine) to 66.9%. Correspondingly, the regenerated cellulose spinning in the composite system exhibited improved mechanical properties, with the elongation at break reaching 15.6% and the tensile fracture strength of 184.1 N per tex (in comparison with 9.6% for elongation at break and 99.7 N per tex for tensile fracture strength for the sample obtained in neat [EMIM]Ac).
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 19
·14431
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IF 5.6
Dayong Huang,Min Wu,Shigenori Kuga,Yong Huang
A facile method was developed for preparing size-controlled silver nanoparticles supported by pyrolytic carbon from microcrystalline cellulose (MCC). The pyrolysis of cellulose-AgNO3mixture caused the oxidation of cellulose, resulting in carboxyl groups to which silver ions can bind firmly and act as nuclei for the deposition of silver nanoparticles. The structure and properties of the obtained nanocomposite were characterized by using a scanning electron microscope (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD). The results suggest that silver nanoparticles were integrated successfully and dispersed uniformly in the pyrolytic carbon matrix. The average particle size varied between 20 nm and 100 nm in correlation to the dose of silver nitrate and temperature of pyrolysis. The products showed high electric conductivity and strong antimicrobial activity againstEscherichia coli(E. coli).Keywords:silver nanospheres;nanocomposite;cellulose;pyrolysis;antimicrobial
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高影响因子
Nano Energy
·
2023
·
IF 17.6
Jianguo Li,Fengjie Tang,Yinghao Bi,Haodong Sun,Liulian Huang,Lihui Chen
It is essential and challenging to develop sustainable and durable passive radiative cooling materials for long-term effectively maintaining human thermal comfort when undergoing intensified global warming in our low-carbon society. Herein, inspired by the distinct structure-property relationship of fruits-branches in fruiter, this work designs an approach of fibrillation of cellulosic fibers (branches of fruiter) followed by in-situ synthesis of SiO 2 nanoparticles (fruits of fruiter) easily to prepare sustainable, robust, customizable, and scalable cooling cellulose fabric. Such coupling strategy of cellulosic-fiber fibrillation and SiO 2 in-situ growth strongly roughens cellulose fabric, more specifically, sufficient micro- and nano-sized cellulose fibrils and SiO 2 particles, which enables our cooling cellulose fabric to effectively reflect solar light with 97% reflectance (0.4–1.0 µm) and emit mid-infrared light with 0.97 emissivity (8–13 µm). As a result, the developed cooing cellulose fabric spontaneously cools the human body with a temperature drop of 7.4 °C in high-temperature summer. It should be noted that the developed strategy realizes extraordinary adhesion performance between nanosized SiO 2 and fibrillated cellulosic fibers , endowing cooling cellulose fabric with durable yet effective cooling distinction despite enduring 100-time mechanical washing and 100-day exposure to air, as well as high strength (∼48 MPa), desirable moisture evaporation rate and breathability . The present work demonstrates a promising strategy how durability, functionality, and customizability can be integrated in future material design.
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ACS Applied Nano Materials
·
2023
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IF 5.9
Yifan Zhi,Jia Xu,Jianlei He,Jiahan Xu,Huanxia Zhang
Graphene is a promising reinforcement for fiber composite materials in flexible wearable applications because of its exceptional conductivity. Researchers have focused on bridging the gap between the intrinsic conductivity of graphene and the macroscopic performance of composite materials. The anisotropy of 2D nanomaterials indicates that their orientation and distribution are crucial factors in determining the macroscopic performance of thin films and bulk materials. Various technologies developed to control the formation of microstructures include electric and magnetic field methods, hot pressing, centrifugation, and freeze-drying. In this study, we prepared flexible graphene/cellulose composite film materials and used magnetic fields to regulate the orientation and distribution of graphene within cellulose paper. Results show that the grid structure of graphene arranged on the composite material produced interconnected conductive paths and reduced the graphene permeation threshold. By giving the conductive layer a higher dielectric constant, we prevented its breakdown as a conductive film. Electroluminescent devices were constructed using graphene/cellulose flexible composite materials and achieved an effective improvement in luminescence performance. Furthermore, directional luminescence was obtained through a microstructure design. This study provides a feasible path for using 2D nanomaterials in high-performance, flexible wearable devices.
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高影响因子
Nanoscale
·
2021
·Vol. 13
·期 17
·8174-8180
·
IF 7.79
Zehao Gu,Mengfan Lu,Kai Feng,Zhaoxia Jin
Cellulose nanocrystals (CNCs) are inherently right-handed nanostructures that originate from nature, showing chirality in their fibrils, bundles, and self-assembled films. However, the enantio-specific interaction between CNCs and other chiral molecules has not been explored so far. In this study, we first demonstrated a chirality-related difference in the composite films of cellulose nanocrystals and histidine with a D- or L-configuration. The distinction is not only presented in the self-assembled nanostructures of CNCs, optical properties, and the thermal decomposition of composites but also in the crystallization of the amino acid. We suppose that it might have originated from the packing of amino acids on the twisted surface of CNCs. The knowledge about the enantio-specific interaction between the chiral amino acid and polysaccharide nanostructure is of significant importance for developing a new strategy for enantiomeric separation.
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高影响因子
ENERGY
·
2021
·
IF 7.147
Genyang Tang,Jing Gu,Zhen Huang,Haoran Yuan,Yong Chen
Biomass-derived chemical looping gasification (BCLG) is a novel technology for lignocellulose energy applications . Ca–Fe oxygen carriers have been proven to be a potential material for efficient lignocellulose conversion and hydrogen-enriched syngas production in process studies. In this study, Thermogravimetry-mass spectrometry (TG-MS), pyrolysis chromatography-mass spectrometry (Py-GC-MS) and fixed-bed experiments were conducted, and the cellulose BCLG product was analyzed to explore the mechanism of reaction between Ca–Fe OCs and biomass char or volatiles. The mechanism of the synergistic effect of Ca–Fe was analyzed to explain the characteristics of the OCs. The results suggest the Ca-based materials act as catalysts to promote the decomposition of cellulose monomers at primary reaction and char at secondary reaction, and also promote the reforming and oxidation of volatiles by chemisorption . Ca participates in the construction of inert substances, such as Ca 2 Fe 2 O 5 , to avoid the deep oxidation of CO and H 2 . Fe-based material supplies oxygen and promotes the reforming of volatile. Compared with Fe 2 O 3 and CaO/Fe 2 O 3 , CaFe 2 O 4 shows a better performance on carbon conversion and H 2 production below 850 °C.
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危险品化学品经营许可证（带存储）