SENSORS AND ACTUATORS A-PHYSICAL
·
2019
·
IF 2.739
Pengjia Qi,Tong Zhang,Jieren Shao,Bai Yang,Teng Fei,Rui Wang
A quartz crystal microbalance (QCM) humidity sensor based on graphene quantum dots-chitosan (GQDs-CS) sensitive film has been successfully fabricated in this work. The composite ratio of sensitive material and the coating quality of the sensitive film were optimized. The morphological and chemical properties of GQDs-CS composites were inspected via scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier Transform infrared spectroscopy (FT-IR). The results manifest that prepared QCM sensor exhibits high response sensitivity (a frequency shift of −3291 Hz at 95% RH), short response/recovery time (36 s/3 s), tiny humidity hysteresis (˜1.6% RH), and excellent reproducibility, reversibility and long-term stability. Additionally, the electroacoustic parameters of the QCM sensors were also investigated by means of the impedance analysis method. Based on dynamic and static analysis of the sensor, it is speculated that the introduction of GQDs into CS enhanced the mechanical stiffness of the CS film, which could effectively improve the performance of QCM sensor.
研究领域:
材料科学
·
传感器技术
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DOI
高影响因子
DESALINATION
·
2026
·
IF 9.8
Xiaohuan Tang,Jinying Zhang,Huiyuan Chu,Jiwei Shen,Chaozhan Wang,Yinmao Wei
Adsorption is effective for removing radioactive iodine in nuclear wastewater treatment, while composite adsorbents can optimize the adsorption performance of adsorbents. In this work, Chitosan and polyphosphazene were used to prepare an aerogel monolith (CS/PCD) with facile recyclability, high hydrophilicity, ultra-lightweight properties, and hierarchical porous structure via hydrothermal synthesis and freeze-drying. Under static conditions, the effects of adsorbent dosage, pH, coexisting ions, and contact time on iodine adsorption were studied. The results demonstrate that CS/PCD reaches a saturated iodine adsorption capacity of 1.20 g·g −1 in aqueous solution, exhibiting good regeneration performance and anti-ion interference capability in accordance with the Freundlich isotherm and pseudo-second-order kinetic models. Under dynamic adsorption conditions, the breakthrough behavior further confirms the material’ effective iodine capture performance. Notably, CS/PCD exhibited a broad applicable pH range (3–8) and good acid-base stability. Furthermore, CS/PCD also demonstrates exceptional performance in gaseous iodine adsorption, achieving a saturation capacity of 3.49 g·g −1 at 348 K. FT-IR and XPS analysis revealed the driving force of adsorption arises from charge transfer through N and O atoms, π-π stacking, hydrogen bonding (N-H···I and O-H···I), and hierarchical porous (microporous-mesoporous-macroporous). In conclusion, this work develops a high-efficiency monolithic adsorbent for radioactive iodine capture, offering a promising continuous-flow method for nuclear wastewater treatment.
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Qing Wu,Bolin Xiao,Yating Li,Renjie Yao,Dan Jin,Yanyang Lei,Dong Yang,Jianfeng Zhu
This paper initially examines the feasibility and effectiveness on interfacial adhesion of composites when grafting nanoparticle-structured polydopamine (PDA) and chitosan around carbon fiber periphery. The resulting interfacial shear strength was maximized as 92.3 MPa, delivering 50.1 % and 15.7–16.2 % gains over those of control fiber and only polydopamine nanospheres (PDA NPs ) or only chitosan modified fiber composites. Measuring surface morphology and thermal stability of fibers found that abundant PDA NPs well adhered with the help of chitosan, highlighting nanoscale size effects and intrinsic adhesiveness of PDA. Under good wettability , rich and dense interfacial interactions (covalent and hydrogen bond , electrostatic interaction , and π conjugation) caused by PDA NPs /chitosan coating provides impetus for effective stress transfer. Additionally, the stable “soft-rigid” combination of chitosan and PDA NPs adds the efficiency of crack passivation. As such, it is hoped that this work could fully explore the possibility of PDA geometry in interphase engineering of fiber composites.
研究领域:
材料科学
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复合材料
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纳米技术
·
高分子科学
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DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 11
·1159-1168
·
IF 1.899
Guo Wenhui,Yang Mingcheng,Liu Shubo,Zhang Xiuqiang,Zhang Benshang,Chen Yang
The development of easy and cost-effective strategies for making multifunctional hydrogels is of great scientific interest. Here, a chitosan/polyvinyl alcohol/tannic acid (CS/PVA/TA) composite hydrogel was prepared by a simple method of γ-ray-induced crosslinking and immersion in TA solution. The chemical composition, transparency, microstructure, mechanical properties and antibacterial activity of the obtained composite hydrogel were characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy, scanning electron microscopy (SEM), tensile measurement, and antibacterial test, respectively. The immersion in TA not only provided a CS ( M w 20,000 g.mol −1 )/PVA composite hydrogel with improved mechanical performance, i.e., tensile strength and elongation-at-break increased by 1100 and 487%, respectively, but also it preserved high transparency of the pure irradiated PVA hydrogel (transmittance exceeded 50% at 660 nm). In addition, the composite hydrogel possessed good antibacterial activity against gram-negative and gram-positive bacteria. The rationality of the immersion TA method in principle was proved by the hydrogen bond simulation. This work provides a simple method for the preparation of multifunctional hydrogels, suitable for large-scale production, and is expected to promote their application in the fields of biomedicine and wound dressings. Graphic abstract
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Min Lu,Shangke Yu,Zuxin Wang,Qiangwei Xin,Tong Sun,Xin Chen,Zhiyao Liu,Xingyu Chen,Jie Weng,Jianshu Li
As a biocompatible natural polymer material, chitosan (CS) is widely used in biomedical fields due to its excellent properties such as antibacterial ability. However, the main drawback of chitosan is that it cannot dissolve in water, seriously limiting its application in biomedical field. In this study, CS was successfully modified with a zwitterionic 2-(methyl acryloyoxy) ethyl choline phosphate (MCP) monomer by Michael addition reaction to obtain choline phosphate functionalized chitosan (CS-MCP). The CS-MCP exhibited an excellent water solubility. The antibacterial activity of CS-MCP was tested against S. aureus and E. coli in vitro , the results indicated that the antibacterial property of CP-MCP dissolved in water was as well as that of CS dissolved in acetic acid. The studies of cytotoxicity and hemolysis of CS-MCP showed that CS-MCP had excellent cytocompatibility and low hemolysis ratio. Thus, the water soluble chitosan derivative CS-MCP with good antibacterial ability and biocompatibility has great potential in biomedicine.
研究领域:
生物医学
·
材料科学
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DOI
高影响因子
Micromachines
·
2020
·Vol. 11
·期 6
·580
·
IF 2.524
Lei Li,Guangming Li
Chitosan (CS) is one of the commonly affluent polysaccharides that are attractive biomaterials as they are easily found in different organisms and are biocompatible. An environment-friendly multi-bit biomemory was successfully achieved on the basis of CS as a favorable candidate for resistive-switching memory applications. By incorporating graphene oxide (GO) into CS, the multi-bit biomemory device (indium tin oxide (ITO)/CS:GO/Ni) was obtained through the solution-processable method, which had a high current ratio among a high, intermediate, and low resistance state as well as a low SET/RESET voltage. GO acting as trapping sites in the active layer might be responsible for the biomemory mechanism. This research opens up a new avenue towards renewable and environmentally benign CS-based materials for biodegradable electronic devices.
研究领域:
材料科学
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生物医学工程
·
纳米技术
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 50
·76263-76274
·
IF 5.19
Zhou Anhui,Qiu Zhaofu,Yang Ji,Yan Ruiqi
The all-vanadium redox flow battery (VRFB) is becoming a promising technology for large-scale energy storage due to its advantages such as scalability and flexibility. In recent years, the VRFB has been successfully developed and put into use in many countries. It is expected that the abandoned VRFB will generate a large amount of vanadium waste. To our knowledge, there are few reports on the disposal of spent VRFBs. Herein, chitosan-coated nano-zero-valent iron (CS-Fe 0 ) is proposed for the first time as adsorbents for the treatment of spent VRFBs. It can provide a new approach to deal with the upcoming large number of spent VRFBs. The calculated maximum adsorption capacity for V(V) of chitosan and CS-Fe 0 reached 209.5 and 511.3 mg/g at 288 K, respectively. CS-Fe 0 showed better adsorption performance than chitosan under different pH conditions and is easy to be separated from the liquid phase. The Freundlich isotherm was suitable for the adsorption process of chitosan, and CS-Fe 0 was more consistent with the Langmuir isotherm. Ionic strength (0.05–0.5 M) had a positive effect on the adsorption capacity of CS-Fe 0 , and the influence of coexisting anions on CS-Fe 0 could be negligible. FTIR and XPS analyses revealed that the primary mechanisms were the electrostatic attraction of chitosan and redox of Fe 0 . The present study confirmed that CS-Fe 0 could be a potential material to efficiently trap V(V) from the VRFB electrolyte.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Zuolong Yu,Guiwei Rao,Yunxiao Wei,Jie Yu,Sihong Wu,Yupei Fang
Of late, the demand for food-packaging materials, in particular, multifunction packaging materials that are biodegradable; antibacterial; have good mechanical and barrier properties; and are edible and transparent, has increased considerably. In this study, we prepared chitosan (CS)/ε-polylysine (PL) biofilms with different CS-to-PL ratios. We studied the preparation, mechanical properties, microstructures, thermal stability, transparency, water-vapor permeability, oil permeability, and antibacterial properties of the composite CS/PL biofilms. The results demonstrate that CS/PL biofilms are mechanically strong, have good thermal stability, high transparency, low water-vapor and oil permeability, and extensive antibacterial properties that act against Escherichia coli , Bacillus subtilis , and yeast. Therefore, we therefore conclude that CS/PL biofilms are promising food-packaging materials.
研究领域:
高分子材料科学
·
食品科学
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包装工程
·
生物医学工程
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应用微生物学
·
材料表征
·
食品安全
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 28
·17005-17019
·
IF 3.108
Shifeng Yan,Taotao Wang,Xing Li,Yuhang Jian,Kunxi Zhang,Guifei Li,Jingbo Yin
Injectable hydrogels as an important biomaterial class have been widely used in regenerative medicine. A series of injectable poly(L-glutamic acid)/chitosan (PLGA/CS) hydrogels were fabricated by self-crosslinking aldehyde-modified PLGA (PLGA–CHO) and lactic acid-modified chitosan (CS–LA). The oxidation degree of PLGA–CHO and degree of substitution (DS) of CS–LA could be adjusted by the amount of sodium periodate and lactic acid, respectively. The effect of the solid content of the hydrogels, oxidation degree of PLGA–CHO and CS–LA/PLGA–CHO mass ratio on the gelation time, gel content, water uptake, mechanical properties, microscopic morphology, and in vitro degradation of the hydrogels was examined. The pH and ion sensitivity of PLGA/CS hydrogels was also examined. Encapsulation of rabbit chondrocytes within the hydrogels showed viability of the entrapped cells and cytocompatibility of the injectable hydrogels. The injectable PLGA/CS hydrogels demonstrated attractive properties for future application in pharmaceutical delivery and tissue engineering.
研究领域:
生物材料
·
再生医学
·
高分子科学
·
生物医学工程
·
细胞生物学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Xiang Li,Hu Tu,Mengtian Huang,Jiajia Chen,Xiaowen Shi,Hongbing Deng,Shuangfei Wang,Yumin Du
The demand for designing antibacterial materials was quite substantial in packing and biomedical materials fields. Chitosan had a wide utilization to satisfy this demand. In this study, by incorporating lysozyme (LY) – rectorite (REC) into chitosan films, the ultimately obtained hybrid films can own the enhanced antibacterial properties and still remains good mechanical properties . Scanning electron microscopy (SEM) images revealed that LY and REC could be homogeneously distributed in the CS films. X-ray photoelectron spectroscopy (XPS) and Energy-dispersive X-ray analysis (EDX) results verified that the LY-REC incorporation process was successful. Small angle X-ray diffraction (SAXRD) and Fourier transform infrared (FT-IR) spectra revealed that some intercalation reactions occurred between CS chains and REC. The hydrophobic properties of the CS films were increased by the addition of LY and REC, determined by water contact angle measurement. In comparison with CS films, the mechanical properties of the composite films after adding LY-REC were reduced by 27.58%, but still maintained high tensile strength . Besides, the antibacterial properties of the films could be enhanced by introducing LY-REC. This method exhibited great application value in the food packaging fields.
研究领域:
材料科学
·
食品包装
·
生物医学工程
·
高分子科学
·
抗菌材料
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Jianfang Jiang,Jiaqi Zhao,Chunyang He,Baodong Cui,Jun Xiong,Hao Jiang,Juan Ao,Guangyan Xiang
The use of cellulase hydrolysis of straw to produce fermentable sugars has many application prospects. However, cellulase is very expensive, which hampers its industrial applications. To improve cellulase’s catalytic activity and reduce the enzyme cost, magnetite carboxymethyl chitosan/calcium alginate – cellulase bioconjugate (MCCCB) was synthesized via an improved hydrothermal method, molecular self-assembly technology, physical absorption, embedding and covalent bonding. Its loading capacity was 3.95 mg/mL, and the catalytic activity increased to 267.18%. We decreased the release rate, improved the reusability, and enhanced the stability of MCCCB. Corn stalk hydrolysis also greatly improved, and the overall yield of fermentable sugars increased by 698.26%. All of these results indicate that MCCCB could significantly improve the efficiency of cellulase, greatly reduce the cost of enzyme, and effectively promote the production of fermentable sugars.
研究领域:
生物化学工程
·
酶技术
·
生物质转化
·
可再生能源
·
生物催化
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DOI
高影响因子
JOURNAL OF PHARMACY AND PHARMACEUTICAL SCIENCES
·
2015
·Vol. 18
·期 2
·155-170
·
IF 1.856
Ke Z,Guo H,Zhu X,Jin Y,Huang Y.
Purpose We investigated the effect of vitamin B12 (VB12) modification on the insulin absorption from trimethyl chitosan(TMC) nanoparticles (NPs) under the influence of mucus. Methods TMC and TMC-VB12 were synthesized and insulin loaded TMC/TMC-VB12 nanoparticles were prepared and characterized. Modified and unmodified nanoparticles were studied with Caco-2/HT29-MTX cell model and ligated rat ileum loop. Results Compared with unmodified NPs, VB12 modified NPs showed significantly higher drug internalization in Caco-2/HT29-MTX cell model. The internalization mechanism via VB12 mediation included caveolae and clathrin-mediated endocytosis pathway. Meanwhile, an increased transportation of drugs was observed for VB12 modified NPs, possibly due to the ligand-receptor interaction via an intrinsic factor-dependent fashion. Although the uptake and transport of VB12 modified NPs could be partially influenced by mucus, they still showed higher drug permeation through Caco-2/HT29-MTX co-cultured cells than unmodified NPs in the presence or absence of mucus. Moreover, in situ study in ligated rat ileum loop demonstrated that VB12 modified nanoparticles could reduce the residual insulin in intestinal lumen (0.59 times) and increase their absorption in epithelial tissue (4.8 times) compared with the unmodified ones. Conclusion VB12 modified trimethyl chitosan nanoparticle is a promising carrier for peroral delivery of insulin.
研究领域:
药剂学
·
药物递送
·
纳米医学
·
生物药剂学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）