POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Richeng Lian,Yunpeng Jiang,Haocun Guan,Jiahui Cui,Qingyao Gao,Lei Liu,Xilei Chen,Chuanmei Jiao
Developing high-performance MXene-based polymer nanocomposites through a biomimetic method has been a research hotspot. However, it is still an intractable challenge to achieve MXene-based polymer nanocomposites with efficient fire safety, excellent thermal conductivity, and enhanced mechanical properties. Here, inspired by the adhesion of mussels, the hierarchical MXene@PDA@CoFeOx nanohybrid was fabricated by a self-assembly strategy and then employed to prepare epoxy resin (EP) nanocomposites. It has been found that MXene@PDA@CoFeOx can display excellent dispersion and interfacial compatibility in EP matrix. Thermogravimetric analysis shows that only 2.0 wt% MXene@PDA@CoFeOx results in excellent thermal stability and char yield (31.29 wt%) of EP under a nitrogen atmosphere. Combustion tests show that the 2.0 wt% MXene@PDA@CoFeOx confers efficient fire safety to EP. Remarkably, the EP-2.0%MXene@PDA@CoFeOx can obtain an attractive UL-94 rating of V0. Meanwhile, the peak heat release rate (pHRR), smoke factor (SF), and peak CO production rate (pCO) of EP-2.0%MXene@PDA@CoFeOx are dramatically decreased by 33.38%, 55.41%, and 36.84% in comparison to those of virgin EP, respectively. The efficient fire safety of EP nanocomposites is mainly attributed to the barrier effect, dilution effect, and catalytic carbonization effect of hierarchical MXene@PDA@CoFeOx. Furthermore, the MXene@PDA@CoFeOx enables EP to boast enhanced thermal conductivity (improved by 69.14%), impact strength (improved by 13.38%), and flexural strength (improved by 17.60%). This work offers a feasible biomimetic method for fabricating hierarchical MXene@PDA@CoFeOx nanohybrids and preparing efficient fire-safe EP nanocomposites with excellent thermal conductivity and mechanical performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xianmin Gong,Shijun Xu,Yiling He,Kaijun Wei,Quangang Chen,Qing Yuan,Yi He,Yi Fan,Xingtao Cheng
Metal-based composite coatings have been widely studied for their excellent properties. In order to improve the properties of nickel tungsten boron (Ni–W–B) matrix, Ni–W–B/PC coatings were prepared by electrodeposition in the presence of polydopamine functionalized VC (P–VC) and cerium oxide (CeO2) nanoparticles. The effect of cerium oxide content in the nanomaterials on the properties of Ni–W–B coatings was investigated. The results showed that the prepared coatings were dense, uniform, and crack-free, and the best performance was achieved at a cerium oxide content of 2 g/L. The addition of CeO2 nanoparticles can fill the tiny defects in the coating and optimize the coating structure. The addition of these two materials refines the size of the coating grains. In terms of coating performance, the corrosion resistance of the composite coating was enhanced with the addition of CeO2 at a certain P–VC concentration, and the total impedance of the composite coating was 24,030 Ω·cm2, which was 4.8 times higher than that of the Ni–W–B coating and 1.7 times higher than that of the Ni–W–B/P–VC coating. In addition, the hardness of the Ni–W–B/PC-2 composite coating reached 1033.93 HV at a CeO2 content of 2 g/L. The wear resistance of this composite coating was also optimized. Compared with the Ni–W–B/P–VC composite coating, the average coefficient of friction was reduced by 8.8%, and the wear resistance of the composite coating was further improved, which was attributed to the synergistic effect of the two materials. Moreover, the Ni–W–B/PC film has excellent hardness and corrosion resistance, which is promising for the application in harsh environments.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuhong Huang,Xiaohui Zhao,Chenlong Hao,Zhixin Ma,Hui Wang,Aijia Zhang,Wanzhihan Zhang,Ling Li,Wenming Zhang
In recent years, multifunctional sensors have attracted significant attention due to their ability to detect different types of signals. However, it still remains a challenge to develop flexible materials with multiple sensing functions. Herein, we propose a strategy to fabricate multifunctional flexible textiles (PCP) that can apply piezoelectric and piezo-phototronic effects to self-powered piezoelectric sensor and photodetector (PD) by utilizing the synergistic effect of polydopamine-coated cerium oxide (CeO 2 @PDA) nanoparticles and poly (vinylidene fluoride) (PVDF). The CeO 2 @PDA nanoparticles served as local nucleating agents and photosensitizers for the PVDF, enhancing the polar crystalline phase and inducing piezoelectric effect, semiconductor, and optical process coupling in PCP textiles. The piezoelectric sensors consisting of PCP textiles produced extremely high sensitivity (1–10 kPa: 1.27 V/kPa; 10–50 kPa: 0.085 V/kPa; 50–100 kPa: 0.02 V/kPa) and significant electrical output (25.5 V and 0.37 μA). Besides, the piezoelectric sensor had extensive applications including pulse wave measurement, limb motion detection, and active voice recognition. It's especially noteworthy that the PD based on PCP textiles is sensitive for the detecting of sunlight illumination as confirmed by response time (t On = 2 s and t Off = 4.6 s). Meanwhile, the fabricated self-powered PD showed significant improvement in output current, confirming the realization of the piezo-phototronic effect in PCP textiles. In this work, the low-cost and high-efficiency multifunctional sensing materials were successfully prepared, providing a novel approach for the next generation of self-powered piezoelectric sensors and photodetectors.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Haiyang Li,Menglei Wang,Xinyu Lei,Boyou Hu,Hanlu Zhang,Yutong Xing,Meng Zhang
Aqueous zinc-ion batteries (AZIBs) can benefit from a deep understanding of the electrochemical reaction mechanism of cathode materials, which can assist in resolving issues such as cathode dissolution and electrostatic interactions. We reported a straightforward two-step synthesis of polydopamine coated MnO 2 (MnO 2 @PDA) and revealed the energy storage mechanisms in AZIBs. The layered structure of MnO 2 creates a generous passage for the insertion of H + /Zn 2+ ions. Simultaneously, the plethora of functional groups within PDA exerts a robust desolvation effect, bolstering the transfer rate of H + /Zn 2+ . This effect significantly enhances the overall efficiency and performance of cathode. The AZIBs, incorporating MnO 2 @PDA cathode material, consequently exhibit a satisfactory cycling capacity (412 mAh g −1 at 0.1 A g −1 ) and a superb specific energy (561.6 Wh kg −1 at 136.34 W kg −1 ). This work provides a new path for design strategies and catalytic mechanisms of MnO 2 @PDA cathode.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
·
2018
·Vol. 106
·期 7
·2544-2552
·
IF 3.373
Chenhui Ji,Zhongzhong Lu,Yonghui Xu,Beibei Shen,Shiyong Yu,Dan Shi
Photodynamic therapy (PDT) holds promise in biochemical study and tumor treatment. A novel multifunctional nanosystem CaO 2 /MnO 2 @polydopamine (PDA)-methylene blue (MB) nanosheet (CMP-MB) was designed. CaO 2 nanoparticles were encapsulated by MnO 2 nanosheet, and then PDA was coated on the surface of CaO 2 /MnO 2 nanosheets, which could adsorb photosensitizer MB through hydrophobic interaction or π-π stacking. In this nanosystem, CaO 2 /MnO 2 had the ability of self-production of oxygen, which solved the problem of tumor hypoxia largely. Moreover, it is worth mentioning that the fluorescence of MB was suppressed by MnO 2 , while its emission was triggered in the simulated tumor microenvironment. Therefore, CMP-MB nanosheet could be used to switch-control cell imaging potentially. 3-(4,5-dimethyl-thiazol-2-yl)-2,5-diphenyltetrazolium bromide testing and Live/Dead assay confirmed CMP-MB nanosheet had fewer side effects without illumination while it destroyed Hela cell with the illumination of light. Vitro cell experiment demonstrated CMP-MB nanosheet could achieve tumor microenvironment responsive imaging and inhibit tumor cell growth under illumination effectively. Therefore, the system has great potential for PDT application and switch-control tumor cell imaging. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2544–2552, 2018.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Xuefeng Sha,Huizhen Huang,Shiyan Sun,Hongye Huang,Qiang Huang,Ziyang He,Meiying Liu,Naigen Zhou,Xiaoyong Zhang,Yen Wei
MXene has emerged as one of the most interesting two-dimensional (2D) nanomaterials , that has been widely explored for various applications, including environmental adsorption. However, the adsorption performance of unmodified MXene is poor and surface functionalization is necessary to endow new properties and improve the adsorption performance. In this work, we reported the fabrication of MXene based bismuth oxide (MXene-PDA-Bi 6 O 7 ) composites for the first time through the mussel-inspired chemistry, which relied on the self-polymerization of dopamine to form polydopamine (PDA) films on MXene for subsequent immobilization of Bi 6 O 7 nanoparticles . The utilization of MXene-PDA-Bi 6 O 7 composites for adsorptive removal of iodide ions and the adsorption parameters on adsorption behavior were examined in details. The surface morphology, chemical structure and chemical compositions of these samples were characterized by a series of techniques. The results demonstrated that the maximum adsorption capacity of MXene-PDA-Bi 6 O 7 towards iodide ions is 64.65 mg/g, which is obviously greater than that of unmodified MXene and MXene-PDA under identical adsorption conditions. In the fabrication strategy, the PDA could be facilely coated on the MXene and provide a platform for further immobilization of the Bi 6 O 7 nanoparticles. This method is simple, easy of operation and can be occurred under benign and mild experimental conditions. Moreover, this method could also be utilized for introduction of other functional components on the MXene and thus multifunctional MXene based composites with designed properties and functions could be fabricated. We believe that this work will open a new avenue for fabrication of functional MXene based composites for environmental treatment.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Cuilian Wen,Hao Liu,Lijin Luo,Zhou Cui,Xiong Li,Junhao Jin,Siqing Yan,Peng Lin,Baisheng Sa
The realization of high-performance EMI shielding materials with flexible, ultrathin and outstanding shielding efficiency is crucial in addressing the growing concern over electromagnetic radiation from electronic devices. In this research, flexible and ultrathin PDA modified Ti3C2Tx MXene/bacterial cellulose (PM/BC) composite films with densely stacked lamellar structures have been developed through a combination of experimental and theoretical investigations. The microstructure, interface interaction, mechanical properties and EMI shielding efficiency of the composite films have been comprehensively investigated. It is highlighted that the strong interfacial interaction between PDA and MXene nanosheets contributes to the enhanced tensile stress (178.1 ± 7.5 MPa) and fracture strain (6.9 ± 0.2%) of the flexible and ultrathin PM/BC composite film, demonstrating its excellent resistance to external forces. More interestingly, the composite film exhibits a remarkable electrical conductivity of up to 39 840 S m−1 and a superior EMI shielding performance of 53.9 dB, indicating its ability to attenuate electromagnetic waves effectively. These findings provide a feasible strategy to develop ultrathin and flexible MXene-based composite films with exceptional EMI shielding capability, which have great potential in protecting electronic devices, including wearable electronic products.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Chengyi Si,Liangliang Xiong,Yawen Zhang,Le Li,Hongyu Liu,Xiaoqiang Fan,Minhao Zhu
To facilitate versatile application of polyimide (PI) under harsh conditions, the PI-PDA@PSF@TO coating was successfully developed. The results illustrate the successful formation of PSF@TO microcapsules by encapsulating tung oil (TO) into polysulfone (PSF). After the modification of polydopamine (PDA), PDA@PSF@TO microcapsules exhibit superior dispersion within the coating compared to PSF@TO, resulting in a 16.8 % increase in tensile strength. Moreover, upon coating damage, the released TO can shield the samples in salt environment for a duration of 8 days. In comparison to PI, PI-PDA@PSF@TO coating exhibits a noteworthy decrease of 42.7 % in wear rate. Even after thermal oxidation, there is a noticeable reduction in the friction coefficient from 0.501 to 0.377, accompanied by a decrease in the wear rate from 6.33 × 10 −7 mm 3 N −1 m −1 to 3.31 × 10 −7 mm 3 N −1 m −1 . This improvement contributes to two factors: (I) The PDA@PSF@TO microcapsules, developed by PSF and PDA, achieves the stable storage of TO in PI. (II) The release of TO forms protective layers, which compensate for defects and provide excellent tribological properties, thereby demonstrating the self-lubrication and self-healing characteristics.
研究领域:
材料科学
·
涂层
·
摩擦学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Huizhen Huang,Xuefeng Sha,Yi Cui,Shiyan Sun,Hongye Huang,Ziyang He,Meiying Liu,Naigen Zhou,Xiaoyong Zhang,Yen Wei
Herein a simple and novel approach has been developed for surface modification of delaminate MXene with nano-mixed silver oxide which combined with mussel-inspired chemistry. Surface modification with dopamine as a secondary reaction platform for loading nano-silver compounds for removal of iodine was achieved. The internal structure and morphology were characterized by SEM and TEM. The element content and distribution analysis of EDS and XPS proved that nano silver compounds were successfully supported and uniformly dispersed on the surface of MXene. Then the adsorption batch experiment was carried out, adsorption time, pH and other factors on the adsorption performance of the adsorbents were studied in details. By calculating the enthalpy change, Gibbs free energy and thermodynamic parameters, the adsorption reaction was found to be an exothermic process. The adsorption kinetics measured the maximum adsorption capacity of 80 mg/g and the removal efficiency is as high as 80% and the adsorption equilibrium time has also been improved. The adsorption kinetics were well fitted by pseudo first-order and second-order models. All the above results demonstrated that the composite from mussel-inspired chemistry has excellent adsorption properties towards iodine ions. This study not only deepens the research on the adsorption behavior of iodine adsorption, but also provides new research directions and experimental methods for pseudo-iodine adsorption.
研究领域:
材料科学
·
环境化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 31
·15064-15070
·
IF 3.925
Zhendong Yan,Yang Wang,Ting Li,Pengwu Xu,Jing Huang,Jie Jiang,Xuhui Zhang,Bihua Xia,Shibo Wang,Weifu Dong
Nanoparticles with ultraviolet/near-infrared (UV/NIR) shielding ability have great potential in the application research of energy-saving materials. In this study, we prepared dual-functional UV/NIR-shielding poly(lactic acid) (PLA) composite films. Firstly, CsxWO3@polydopamine (CWO@PDA) nanoparticles with core–shell structures were formed by dopamine self-polymerization on the surface of CWO, and then CWO@PDA-g-PLLA nanoparticles were successfully prepared by ring-opening polymerization with L-lactide as a raw material. Finally, PDLA/CWO@PDA-g-PLLA composite films containing different proportions of CWO@PDA-g-PLLA nanoparticles were fabricated via a solvent casting method. The results showed that these films have an excellent UV shielding performance and strong absorption in the NIR region (800–2500 nm). When 1.5 wt% of CWO@PDA-g-PLLA nanoparticles was added, the near-infrared transmittance of the composite films decreases significantly from 79.7% to 29.8%. More importantly, the nanoparticles can be used as a heterogenous nucleator to enhance the HC crystallization of PDLA and form stereocomplex crystallites between PDLA and CWO@PDA-g-PLLA nanoparticles which improved the mechanical properties. This study provided a new method for the preparation of PLA nanocomposites with excellent UV/NIR shielding function. These nanocomposites are promising for practical application on energy-saving windows.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2015
·
IF 2.912
Yirong Jiang,Shuqin Mao,Weisu Huang,Baiyi Lu,Zengxuan Cai,Fei Zhou,Maiquan Li,Tiantian Lou,Yajing Zhao
Variations of phenylethanoid glycoside profiles and antioxidant activities in Osmanthus fragrans flowers through the digestive tract were evaluated by a simulated digestion model and UPLC/PDA/MS. Major phenylethanoid glycosides and phenolic acids, namely, salidroside, acteoside, isoacteoside, chlorogenic acid, and caffeic acid, were identified in four cultivars of O. fragrans flowers, and the concentration of acteoside was the highest, being up to 71.79 mg/g dry weight. After simulated digestion, total phenylethanoid glycoside contents and antioxidant activities were significantly decreased. Acteoside was identified as decomposing into caffeic acid, whereas salidroside was found to be stable during simulated digestion. According to Pearson’s correlation analysis, acteoside contents showed good correlations with antioxidant activities during simulated digestion (R2 = 0.994, P < 0.01). In conclusion, acteoside was the major contributor to the antioxidant activity of O. fragrans flowers, and salidroside was considered as the major antioxidant compound of O. fragrans flowers in vivo.
研究领域:
植物学
·
药理学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2020
·
IF 3.644
Bi Yanhong,Wang Zhaoyu,Tian Yaoqi,Fan Haoran,Huang Shuo,Lu Yihui,Jin Zhengyu
The immobilization of Thermomyces lanuginosus lipase on polydopamine-functionalized Fe3O4 magnetic nanoparticles (Fe3O4@PDA-TLL) as a nanobiocatalyst was successfully performed for the first time, and the Fe3O4@PDA-TLL was used for regioselective acylation of natural hyperoside with vinyl decanoate. The effects of several crucial factors, such as the reaction solvent, substrate molar ratio, temperature, and immobilized enzyme dosage, were investigated. Under optimum conditions, the reaction rate, 6″-regioselectivity, and maximum substrate conversion were as high as 12.6 mM/h, 100%, and 100%, respectively. An operational stability study demonstrated that the immobilized enzyme could maintain 90.1% of its initial maximum conversion even after reusing it five times. In addition, further investigations on the kinetic parameters, like Vmax, Km, Vmax/Km, and Ea, also revealed that the biocompatible Fe3O4@PDA could act as an alternative carrier for the immobilization of different enzymes.
研究领域:
生物化学
·
纳米生物学
·
酶工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）