RSC Advances
·
2014
·Vol. 5
·期 7
·4795-4803
·
IF 3.708
Wei Shao,Hui Liu,Xiufeng Liu,Shuxia Wang,Rui Zhang
In the present work, a novel composite material formed by bacterial cellulose (BC) networks and graphene oxide (GO) nanosheets was synthesized by a sonochemical method. The BC and as-prepared BC/GO composites were characterized by several techniques including Scanning Electron Microscopy (SEM), Fourier-transform infrared (FTIR) spectra, ultraviolet-visible (UV-vis) absorption spectra, thermogravimetric analyses (TG) and X-ray diffraction (XRD). SEM images showed that the morphologies of composites became more compact than BC. FTIR, UV, TG and XRD confirmed the existence of GO in the composites. Moreover, HEK 293 cells were cultivated, and both the biocompatibility of the materials and the cell viability were demonstrated. Meanwhile, the anti-bacterial performances of BC/GO composites were evaluated with Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), which frequently cause medically associated infections. The experimental results showed that the BC/GO composites have excellent anti-bacterial activities, thus confirming its utility as a potential biomaterial in biomedical applications. Furthermore, the anti-bacterial behavior had been well explained by the extended DLVO theory.
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POLYMER TESTING
·
2019
·
IF 2.943
Zhuo Cao,Weijie Li,Xidong Suo,Yaodong Liu,Chunxiang Lu
Polyacrylonitrile (PAN)/cellulose composite fibers have been produced by dry-jet gel spinning through their co-solution. The rheological properties of PAN/cellulose/dimethylacetamide/LiCl solutions containing different cellulose contents from 0 to 10 wt% were characterized, and 5 wt% PAN/cellulose composite solution shows the best solution homogeneity. During gel spinning, the cellulose forms elongated particles inside the gelation bath, and the particle diameters depend on the as-spun draw ratio. It was found that the glass transition of PAN fibers shifts to higher temperatures along with the increase of cellulose content, and the glass transition activation energy of PAN chains becomes higher when cellulose particles become smaller. Regardless the changes of cellulose amount (2–10 wt%) and particle diameter (7.1–1.4 μm), the cyclization activation energy of PAN/cellulose composite fibers is 13–17% lower than that of neat PAN fibers. Our experiments suggest that the addition of cellulose in PAN fibers has no direct effect on the cyclization reaction of PAN chains. Instead, the released by-products during the pyrolysis of cellulose at high temperature degradation affect the cyclization reaction of PAN chains.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Juan Guo,Wenbo Du,Yong Gao,Yuan Cao,Yafang Yin
A novel water-in-soybean oil Pickering emulsifier based on CNCs was fabricated via the intercalative chemical reaction between n -octadecyl isocyanates and hydroxyl groups in CNCs. The structural variations of alkyl intercalated CNCs with different degrees of substitution for hydroxyl groups were studied by TEM, AFM, FTIR, XRD , elemental analysis and liquid DSC . It is shown that O(2)H/O(6)H instead of O(3)H in CNCs were substituted after intercalative modification. And the particle thickness was increased after the intercalation, due to the enlargement of the basal spacing of (200) lattice plane in CNCs. While their cross section dimensions were unvaried. The structural variations in alkyl intercalated CNCs on their emulsifying capacity were further studied. Particle length has the insignificant influence on the emulsifying capacity. Alkyl intercalated CNCs with different particle lengths failed to stabilize water-in-soybean oil Pickering emulsion droplets, if O(2)H/O(6)H hydroxyl groups were fully substituted with alkyls. Alkyl intercalated CNCs with appropriate amounts of substituted hydroxyl groups possessed a good emulsifying capacity. After the initial coalescence, the average droplet size and its distribution polydispersity remained nearly constant with one year of storage. Results shown that alkyl intercalated CNCs with different degrees of substitution for hydroxyl groups had the similar interfacial tension at the soybean oil-water interface, the similar molecular arrangement of internal intercalated alkyls but different contact angles. These indicated that emulsifying capacity was mainly related to their surface alkyl chains. Besides, water-in-soybean oil Pickering emulsions stabilized by alkyl intercalated CNCs were from steric hindrance rather than interfacial tension reduction mechanism.
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Additive Manufacturing
·
2024
·
IF 10.3
Xiaojie Shi,Chuhang Liu,Bo Lin,Guoqiang Zhou,Chaozheng Liu,Changtong Mei,Mei-Chun Li
The high degree of modularity and miniaturization of nanoelectronic devices results in a significant increase in heat flux per unit area of electronic components. This can cause a rise in temperature, especially when used outdoors under direct sunlight conditions, which can negatively impact their operational stability and service life. Traditional radiators have limited effectiveness in outdoor sunlight conditions. Additionally, conventional heat sinks are often too large and heavy for miniature electronic devices. Therefore, finding an effective solution to cool electronics under sunlight conditions remains a challenge. Herein, we present an innovative solution to fabricate 3D-printed coolers for electronic devices based on the methyltrimethoxysilane/silica/cellulose nanofibers (MSC) ink. 3D printing technology enables the fabrication of radiative coolers with complex structures and efficient cooling performance as needed. The combination of CNFs and SiO₂ nanoparticles, coupled with the porous nature of the structure, enables the 3D-printed MSC scaffold to exhibit excellent solar reflectance and high mid-infrared (MIR) emissivity, thereby facilitating superior radiative cooling capabilities. During the daytime, it can efficiently reduce the temperature of electronic devices by 6.16 °C, thereby improving their operational efficiency and service life. Furthermore, the 3D-printed MSC scaffold exhibits superior mechanical properties due to the robust 3D frame structure formed by the ink components, which provides stability for the electronic device during operation. This study presents an innovative approach to developing electronic device coolers with excellent cooling performance, which is significant in promoting the reliability and stability of electronic devices.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Lei Wang,Cunzhi Zhang,Hui He,Hongxiang Zhu,Wei Guo,Shile Zhou,Shuangfei Wang,Joe R. Zhao,Jian Zhang
A novel cellulose-based colorimetric sensor (DAC-Tu) with N, S sites for Ag + was prepared. The DAC-Tu exhibited excellent selectivity and sensitivity for Ag + with a naked eyes color change from white to black in mixed metal ions aqueous solutions. The naked-eye in-situ detection limit of DAC-Tu for Ag + was 10 −6 mol/L within 10 min. The cellulose matrix and the grafted functional groups ( C S, NH 2 ) of DAC-Tu all contributed to the low naked-eye in-situ detection limit. The mechanism of the visual recognition of DAC-Tu sensor for Ag + was proposed, the N and S atoms of DAC-Tu preferentially coordination chelated with Ag + to form N Ag, S Ag, and Ag 2 S, and enriched on the cellulose matrix, thus the DAC-Tu presented different color change in response to different concentrations of Ag + . The as-prepared DAC-Tu colorimetric sensor showed a great application prospect for in-situ naked eyes detection of Ag + .
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GREEN CHEMISTRY
·
2019
·Vol. 21
·期 10
·2759-2770
·
IF 9.405
Chuanwei Lu,Chunpeng Wang,Juan Yu,Jifu Wang,Fuxiang Chu
Photoinduced metal-free “grafting from” atom transfer radical polymerization (ATRP) has been successfully applied to the fabrication of renewable cellulose graft copolymers with the aid of 2-bromo-2-phenylacetyl ester-modified ethyl cellulose as the macroinitiator. In the presence of an organic-based photoredox catalyst, “grafting from” polymerization of lauryl methacrylate from ethyl cellulose was efficiently activated and deactivated with UV irradiation, resulting in good control over molecular weight. 1H NMR and MALDI-TOF MS confirmed highly preserved Br chain-end functionality. Furthermore, cellulose graft copolymers with a block side chain architecture were successfully prepared through chain extension by metal-free “grafting from” ATRP. We believe that this work will provide a novel approach to design well-defined cellulose graft copolymers and further expand their application fields.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yi Liang,Yongyue Peng,Xinlong Zhou,Shuyuan Chen,Wei Li,Jian Li,Xiaoting Niu,Wei Guo
The extensive use of petroleum-based plastics has resulted in critical energy and environmental challenges, driving the pursuit of sustainable and biodegradable bioplastics as ideal alternatives. However, the development of functional bioplastics with superior mechanical strength, water stability, and thermal stability remains a formidable challenge. Herein, inspired by the nacre, a cellulose-based bioplastic was designed with a unique layered architecture and enhanced interfacial interactions，achieved through the self-assembly of carboxymethyl cellulose (CMC) and nano-montmorillonite, while simultaneously forming a chemically and physically double-crosslinked network under the action of TiO 2 nanoparticles and citric acid. The resulting bioplastic demonstrated excellent mechanical performance, with the tensile strength reaching 106.83 MPa, representing a 220.09 % improvement over pure CMC-based bioplastic and surpassing the tensile strength of other CMC-based films. Alongside mechanical prowess, it exhibited exceptional water resistance (water absorption reduced to 42.88 %), thermal stability and UV shielding. Furthermore, it was biodegradable and environmentally benign, capable of achieving complete degradation in the soil within three months. This biomimetic strategy provided a novel approach for developing competitive cellulose-based bioplastics, offering a promising alternative to petroleum-derived plastics for everyday applications.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yuhan Mai,Yang Zhou,Qihuang Ye,Zhiyou Wang,Chao Li,Yanling Chen,Huipingi Xiao,Yanyu Hu,Jiahui Li,Wei Zhang,Tongyao Wang,Haili Lin,Longguang Jiang,Cai Yuan,Peng Xu,Mingdong Huang
Microbial infection in open wounds can delay healing and lead to severe complications. This study introduces a bacterial-responsive cellulose-based fabric wound dressing (Fabric-PAC) with integrated antimicrobial and hemostatic functions. Fabric-PAC is chemically modified with polyphosphate (PolyP) and low-dose silver nanoparticles (AgNPs), and further functionalized with a phthalocyanine-based photosensitizer via supramolecular interactions on surface. Upon contact with bacteria, the photosensitizer is displaced, exposing PolyP to initiate blood coagulation and platelet-deriven tissue remodeling, promoting wound healing. Simultaneously, AgNPs are also exposed to provede sustained bacteriostasis. Moreover, the positively charged photosensitizer tightly attaches on the bacterial surface, and triggers the antimicrobial photodynamic effect upon illumination, rapidly eliminating pathogens. This study not only introduces a bacteria-responsive wound dressing with synergistic antimicrobial and hemostatic effects, but also offers a new strategy for the functionalization of cellulose-based materials.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Wei Sun,Yansong Yao,Junping Ju,Hua Yuan,Yeqiang Tan
High-performance nanofiber membranes with simultaneously satisfactory water resistance and active and rapid degradation characteristics have received growing attention in food packaging. However, the agglomeration of a konjac glucomannan (KGM) aqueous solution may occur in high concentration, and it is difficult to prepare uniform nanofibers by electrospinning technology. This study presented a green approach for fabricating nanocomposite nanofiber membranes via electrospinning with konjac glucomannan (KGM) and cellulose nanocrystals (CNCs) as raw materials. Citric acid (CA) was added as a green cross-linker to the aforementioned matrix, resulting in enhanced physicochemical properties. We investigated the effects of incorporation of various CNC contents (2.0–8.0 wt %, based on the entire solution’s weight) and CA contents (0.2–0.6 wt %, based on the weight of KGM) on the microstructure and rheological behavior of the electrospun nanofibers. Results demonstrated that esterification interactions occurred in the nanofiber membranes between the molecular chains of KGM, CNC, and CA. Moreover, the nanocomposite membranes were subjected to esterification using stearic acid and loaded with curcumin for enhancing their water resistance and antibacterial and biodegradable properties. Further investigations confirmed that the nanocomposite membranes exhibited considerable pH-sensitive variations, turning from pink-red to deep red when the pH was increased from 7 to 13. The nanocomposite membranes exhibit exceptional potential as multifunctional components in advanced active packaging systems.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuxin Zhu,Chengqi Feng,Chenkai Jin,Juan Cai,Juncheng Huang,Haining Na,Jin Zhu
High-humidity environments can cause swelling of triboelectric nanogenerator (TENG) sensing substrates, leading to response hysteresis, impedance attenuation, and electrostatic shielding, thereby reducing device sensitivity and long-term stability. To address this, this study designed and fabricated a micro/nano-structured microfibrillated cellulose (MFC)-hydroxyapatite (HAP)‑carbon nanotube (CNT) membrane. The material forms an urchin-like fibrous structure through self-assembly, combined with a loosely connected MFC-HAP fiber network, synergistically endowing it with hydrophobicity and porous properties. This structure significantly enhances the electrical output of TENGs. Tests show that the fabricated cellulose-based TENG maintains 86.6 % of its initial voltage output at 90 % relative humidity and stable performance after 2000 cycles in 99 % ultra-high humidity. Furthermore, its practicality in wearable sensing was demonstrated through motion monitoring and Morse code transmission. This study innovatively proposes a humidity-resistant TENG design strategy based on micro/nano-structure regulation, providing new theoretical and practical guidance for self-powered sensing in humid environments.
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BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Yue Shen,Jian-Kui Sun,Yu-Xuan Yi,Bo Wang,Feng Xu,Run-Cang Sun
A simple and effective route for the production of levulinic acid (LA) from cellulose has been developed in SO 3 H-functionalized ionic liquids. The effects of ionic liquid structures, reaction conditions and combination of metal chlorides with ILs on the yield of LA were investigated, where the highest yield of 39.4% was obtained for 120 min in the presence of 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulphate ([BSMim]HSO 4 ) with addition of H 2 O. The catalytic activities of ionic liquids depended on the anions and decreased in the order: CF 3 SO 3 − > HSO 4 − > OAc − , which was in good agreement with their acidity order. The ILs play a dual solvent-acid role for the cellulose conversion into LA and exhibited favorable catalytic activity over four repeated runs.
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PubMed
高影响因子
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
·
2025
·Vol. 37
·期 5
·04025108
·
IF 3
Fangfang Zhi,Xiaodan Tang,Liang Wang,Zhipeng Bai,Binbin Na,Lei Zhang,Guohui Yang,Linhua Jiang
Cellulose ethers (CE) are generally used in cement-based materials as viscosity modifying admixtures. However, previous investigations scarcely focused on the effect of CE on the carbonation behavior of host materials. This work studied the effect of CE on the carbonation behavior of cement pastes. The carbonation resistance of samples was determined using the carbonation depth and pH values. The changes in hydration products and microstructure of host materials were monitored to reveal the underlying mechanisms using electrochemical impedance spectroscopy, X-ray diffraction analysis, thermogravimetric analysis, scanning electron microscopy, and mercury intrusion porosimetry. The results indicate that CE decrease the portlandite (CH) content and inhibit the growth of CH crystal with a smaller size and eroded edges, thus increasing its reactivity with CO2 during carbonation. CE increase the porosity and coarsen the pore structure because of the air-entrainment effect in cement pastes, promoting the CO2 diffusion in the system. As a result, CE decrease the carbonation resistance of cement pastes with increasing the CE content.
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危险品化学品经营许可证（带存储）