COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Min Sang,Shuai Liu,Wenwen Li,Sheng Wang,Jun Li,Ji Li,Shouhu Xuan,Xinglong Gong
Recently, multifunctional materials have attracted tremendous attention in intelligent equipment and human–computer interaction, requiring the integration of electrical conductivity, sensing property and heating management. Herein, conductive MXene is formulated and deposited on the PVDF film surface and followed by integrating PI tape to construct a multifunctional PVDF/MXene/PI wearable electronic. The PVDF/MXene/PI with sandwich structure shows ideal mechanical strength and tensile toughness. Based on the conductive MXene network, PVDF/MXene/PI composite possesses excellent mechanosensation ability, which can sensitively monitor different human movements. Besides, PVDF/MXene/PI composite presents prominent Joule heating capability and achieves a temperature of over 80 ℃ at 6.5 V voltage. Insulated high-temperature resistant PVDF and PI tape as protective layers ensure the stability and safety of PVDF/MXene/PI heater. Moreover, PVDF/MXene/PI composite exhibits outstanding electromagnetic interference shielding effectiveness of 40 dB. Finally, PVDF/MXene/PI multifunctional electronic with fascinating multi-functions shows potential applications in human thermotherapy, human–machine interaction and electromagnetic wave protection.
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Tong Liu,Yangcheng Ding,Chengyan Liu,Jinglong Han,Aijie Wang
Pyridine and organics containing pyridine rings are widely used but persist in the environment and cause toxic pollution. Due to the attraction of the nitrogen atoms to the electrons in the pi bond, the pyridine ring is difficult to oxidize by oxidant. Here, we propose that ultraviolet (UV) irradiation activates the electrons in the pi bond and enables combination with the hydroxyl radical ( OH) originating from hydrogen peroxide (H 2 O 2 ) to eliminate pyridine quickly and mineralize the byproducts. The removal rates of pyridine and total organic carbon (TOC) were compared in different treatments: UV irradiation, UV/H 2 O 2 treatment and Fenton oxidation with different initial pyridine concentrations, pH values and H 2 O 2 concentrations. The UV/H 2 O 2 treatment yielded a higher pyridine removal rate and greater mineralization than the other treatments. The removal rate of pyridine was highest in neutral aqueous solution and H 2 O 2 concentration of 10 mM. At an initial H 2 O 2 concentration of 10 mM, more than 90% of the pyridine was degraded in 10 min, and approximately 70% of the TOC was removed in 60 min. The absorption of UV light at 254 nm by the pi bond of pyridine can accelerate the damage to the stable pyridine structure, especially in the presence of OH. This study provides a promising alternative for the removal and mineralization of pyridine ring-containing materials.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Lu Ye,Jun Wei,Changning Ran,Jianjun Zhang,Yue Zhang,Sude Ma
The problem of low charge/discharge efficiency of ceramic/polymer composites is still one of the hot topics in current research on dielectric materials. Here, we demonstrate that the ferroelectric property of ceramic/PVDF-based composites can be modulated by the introduction of linear polymer PI and the use of a spin-coating process. PI inhibits some polarization and partial dipole orientation by interacting with the molecular chains of the amorphous phase of PVDF and BT nanoparticles. As a result, the decrease in crystallinity and loss led to improved dielectric properties and charge/discharge efficiency. The findings demonstrate that the microstructure of PVDF-PI/BT nanocomposite is uniform and dense, with outstanding dielectric characteristics and high charge/discharge efficiency. The permittivities were stabilized in the range of 12.87–17.86 at 100 Hz, and the dielectric losses were all less than 0.27. Compared with the previously reported binary ceramic/polymer composites, the PVDF-PI/BT nanocomposites possessed a high charge/discharge efficiency with a small variation (63%-84%). This work offers an easy and efficient scheme to obtain nanocomposites with outstanding dielectric characteristics and charge/discharge efficiency. It may be a potential candidate for flexible dielectric substrates for advanced flexible capacitive energy storage devices.
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高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Li Yu,Wang Dan,Xu Guanchen,Qiao Li,Li Yong,Gong Hongyu,Shi Lei,Li Dongwei,Gao Meng,Liu Guoran,Zhang Jingjing,Wei Wenhui,Zhang Xingshuang,Liang Xiu
Air and water pollution poses a serious threat to public health and the ecological environment worldwide. Particulate matter (PM) is the major air pollutant, and its primary sources are processes that require high temperatures, such as fossil fuel combustion and vehicle exhaust. PM0.3 can penetrate and seriously harm the bronchi of the lungs, but it is difficult to remove PM0.3 due to its small size. Therefore, PM0.3 air filters that are highly efficient and resistant to high temperatures must be developed. Polyimide (PI) is an excellent polymer with a high temperature resistance and a good mechanical property. Air filters made from PI nanofibers have a high PM removal efficiency and a low air flow resistance. Herein, zeolitic imidazolate framework-8 (ZIF-8) was used to modify PI nanofibers to fabricate air filters with a high specific surface area and filtration efficiency. Compared with traditional PI membranes, the ZIF-8/PI multifunction nanofiber membranes achieved super-high filtration efficiency for ultrafine particles (PM0.3, 100%), and the pressure drop was only 63 Pa. The filtration mechanism of performance improvement caused by the introduction of ZIF-8/PI nanofiber membrane is explored. Moreover, the ZIF-8/PI nanofiber membranes exhibited excellent thermal stability (300 C) and efficient water–oil separation ability (99.85%).
研究领域:
环境科学
·
材料科学
·
空气污染控制
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Huan Yu,Libo Du,Lingmei Guan,Kui Zhang,Yingyun Li,Houjuan Zhu,Mingtai Sun,Suhua Wang
The sensitive and selective analytical methods for real-time monitoring of sulfur dioxide and its derivatives are significant for human health, pollution-control and food safety. Herein, we report a new nanocomposite (Hex-FGO-DPS) consisting of cyanine dye and fluorescent graphene oxide with unique reactive properties for ratiometric fluorescent detection of bisulfite. The ratiometric fluorescence of Hex-FGO-DPS in aqueous solution can be sensitively, selectively and efficiently tuned by bisulfite through a specific nucleophilic addition reaction. In the presence of bisulfite, the ratiometric fluorescence intensity of Hex-FGO-DPS (F 470nm /F 580nm ) changes up to 25 folds, accompanied by a distinct color change from yellow to blue which can be visually identified. The detection limit was measured to be 0.44 μM. The probe can be further applied for sensing intracellular bisulfite through the ratiometric fluorescence imaging analysis in living cells. In addition, the probe Hex-FGO-DPS also can be used for selective determination of gaseous sulfur dioxide in atmosphere and aqueous solution. The simple, sensitive and effective strategy reported here could facilitate the development of portable and reliable sensor for visual identification applications.
研究领域:
分析化学
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环境科学
·
生物医学工程
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DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 23
·5687-5693
·
IF 5.773
Weijia Lv,Zhihang Liu,Jinjing Lan,Ziyu Liu,Wenxin Mi,Juying Lei,Lingzhi Wang,Yongdi Liu,Jinlong Zhang
Spurred by the threat of hexavalent chromium (Cr(VI)), the idea of reducing Cr(VI) into less toxic Cr(III) has been commonly studied. Here, we used a facile photodeposition method to modify inverse opal TiO2 (i.o.TiO2) with cobalt phosphate (Co-Pi), and the resulting composite was applied for photocatalytic reduction of Cr(VI). This is the first time that an inverse opal structure as well as a Co-Pi catalyst is applied in the photocatalytic reduction of Cr(VI). In addition, the combination of i.o.TiO2 and Co-Pi achieves high visible-light-driven photocatalytic activity, which is better than that of the pure Co-Pi catalyst and unmodified i.o.TiO2. Experimental results demonstrated that the Co-Pi in the composite could absorb a large amount of visible light and then inject electrons into the conduction band of i.o.TiO2 which subsequently participate in the reduction reaction of Cr(VI). Moreover, the inverse opal structure of the catalyst possesses the advantages of having a large surface area and efficient light harvesting ability, leading to the better catalytic activity of Co-Pi/i.o.TiO2 than Co-Pi/bulk TiO2 and Co-Pi/P25. It's also proved that this Co-Pi/i.o.TiO2 photocatalyst can efficiently remove organic pollutants together with Cr(VI). This study provides new insights into the design and fabrication of efficient photocatalysts for the removal of environmental pollutants under visible light.
研究领域:
环境科学
·
材料科学
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高影响因子
Microsystems & Nanoengineering
·
2024
·Vol. 10
·期 1
·1-13
·
IF 7.3
Han Donglai,Guo Boyang,Li Yanru,Feng Wei,Liu Keyan,Wu Tianna,Wan Yuchun,Wang Lili,Gao Ming,Liu Yang,Yang Lili,Wei Maobin,Yang Shuo
Facile and efficient photocatalysts using sunlight, as well as fast and sensitive surface-enhanced Raman spectroscopy (SERS) substrates, are urgently needed for practical degradation of tetracycline (TC). To meet these requirements, a new paradigm for PI/TiO 2 /Ag organic‒inorganic ternary flexible microfibers based on semiconducting titanium dioxide (TiO 2 ), the noble metal silver (Ag) and the conjugated polymer polyimide (PI) was developed by engineering a simple method. Under sunlight, the photocatalytic characteristics of the PI/TiO 2 /Ag flexible microfibers containing varying amounts of Ag quantum dots (QDs) were evaluated with photocatalytic degradation of TC in aqueous solution. The results demonstrated that the amount of Ag affected the photocatalytic activity. Among the tested samples, PI/TiO 2 /Ag-0.07 (93.1%) exhibited a higher photocatalytic degradation rate than PI/TiO 2 (25.7%), PI/TiO 2 /Ag-0.05 (77.7%), and PI/TiO 2 /Ag-0.09 (63.3%). This observation and evaluation conducted in the present work strongly indicated a charge transfer mechanism. Moreover, the PI/TiO 2 /Ag-0.07 flexible microfibers exhibited highly sensitive SERS detection, as demonstrated by the observation of the Raman peaks for TC even at an extremely low concentration of 10 –10 moles per liter. The excellent photocatalytic performance and SERS detection capability of the PI/TiO 2 /Ag flexible microfibers arose from the Schottky barrier formed between Ag and TiO 2 and also from the outstanding plasmonic resonance and visible light absorptivity of Ag, along with immobilization by the PI. The successful synthesis of PI/TiO 2 /Ag flexible microfibers holds significant promise for sensitive detection and efficient photocatalytic degradation of antibiotics.
研究领域:
环境科学
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材料科学
·
分析化学
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xing-Wen Huang,Song-Yi Liao,Yi-Dong Liu,Qiu-Shi Rao,Xiao-Kang Peng,Yong-Gang Min
A novel PEO/CMC-Li @PI hybrid solid polymer electrolyte membrane was designed/assembled by utilizing the polyethylene oxide (PEO) as matrix, the modified N-carboxymethyl chitosan (CMC-Li) as the facilitator to accelerate the transport of lithium ions and the as-prepared polyimide (PI) non-woven fabric as supporting framework. The CMC-Li was firstly synthesized and then combined with PEO and PI non-woven fabric to assemble PEO/CMC-Li@PI membrane using in all solid-state battery (ASSB). The microscopic morphology of the PEO/CMC-Li@PI hybrid membrane was characterized by SEM images. The membranes thermodynamic behaviors were analyzed by the DSC/TG curves, showing that the T m of the PEO/CMC-Li@PI decreased to 46.8 °C. When assembled into all-solid-state battery, the PEO/CMC-Li@PI membrane demonstrated the high ionic conductivities of 3.16 × 10–5 S/cm (30 °C) and 3.15 × 10–4 S/cm (60 °C) calculated from EIS spectra. The electrochemical window of the PEO/CMC-Li@PI cell was measured up to ~5 V at 60 °C. Moreover, the cell with PEO/CMC-Li@PI also delivered excellent electrochemical performances by comparing with other membranes. The high discharge capacities and cycling stability in PEO/CMC-Li@PI cell were assigned to the enhanced ionic conductivity by the added CMC-Li derivative and the improved mechanical properties by the PI non-woven fabric skeleton. The fabrication strategy of the novel PEO/CMC-Li@PI membrane may provide some new design directions for the solid polymer electrolytes in all-solid-state battery.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yue Sun,Simeng Shao,Yanfeng Wang,Wenjuan Lu,Pingping Zhang,Qingqiang Yao
For the first time, g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi heterojunctional hollow spheres were successfully fabricated via thermal condensation method followed by solvothermal and photo-deposition treatment, which showed excellent photocatalytical property. Except for the Z-scheme charge transfer between α-Fe 2 O 3 and g-C 3 N 4 , the Co-Pi could further reduce the combination of photogenerated electrons and holes as a hole storage agent, resulting in remarkably enhanced visible-light photocatalytic water splitting activity with the H 2 production rate of 450 μmol h −1 g −1 , which is 15.7 times higher than that of g-C 3 N 4 . Moreover, the photocatalytic activity of the prepared ternary hollow photocatalysts showed almost no significant weakness after five cycles, which indicated their good performance stability. The as-prepared g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi also possessed good activity for overall water splitting with the hydrogen production rate reaching 9.8 μmol h −1 g −1 . This synthesized g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi composite is expected to be a promising candidate for water splitting.
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高影响因子
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
·
2014
·
IF 2.227
Hui Gao,Wenqi Niu,Chaoqun Huang,Yan Hong,Chengyin Shen,Hongmei Wang,Yan Lu,Xiaojing Chen,Lei Xia,Haihe Jiang,Yannan Chu
The photoionization electron attachment ion mobility spectrometry (PI-EA-IMS), with photoelectrons formed by photoionization of organic compound like acetone, has been developed to study electron attachment reactions. With this apparatus, the rate constants for electron attachment to alkyl iodides including ethyl iodide (C 2 H 5 I), 1-propyl iodide (1-C 3 H 7 I), 1-butane iodide (1-C 4 H 9 I) and 2-propyl iodide (2-C 3 H 7 I) have been determined over the average electron energy from 0.29 to 0.96 eV. The rate constants are in the order of magnitude of ∼10 −9 cm 3 molecule −1 s −1 . The experimental measurements show that for straight-chain alkyl iodides, the values of the rate constants follow the order of: k (C 2 H 5 I) < k (1-C 3 H 7 I) ≈ k (1-C 4 H 9 I) which can be explained by the energy threshold for the formation of iodine anion via dissociative electron attachment. For the isomers, 2-C 3 H 7 I has a lower rate constant than 1-C 3 H 7 I which may be caused by the effect of branched chain.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 18
·13360-13370
·
IF 2.019
Lu Haowei,Lin Jiaqi,Yang Wenlong,Liu Lizhu
The Ba 0.859 Ca 0.141 Zr 0.106 Ti 0.894 (BCZT) nano-particles were modified by polyimide (PI) through a chemical coating method. And the PI@BCZT/polyvinylidene fluoride (PVDF) flexible composite films were fabricated by solution casting method. The transmission electron microscopy and scanning electron microscopy results show that the nano-particles is about 50 nm, PI is uniformly coated on the surface of BCZT nano-particles about 7–10 nm as well as there are uniform and improved dispersion in the matrix after modification. A series of dielectric properties were carried out. The results show the 50 vol% composites own a remarkably enhanced dielectric permittivity (ε r = 130) at 100 Hz. After modification, the breakdown strength has increased from 20 to 96 kV mm −1 and the loss tangent is reduced from 1.8 to 0.2 at 100 Hz compare with un-modified composites in 40 vol% dopant. With the increase of dopant, ferroelectricity of composites can be enhanced. The optimal residual polarization is 40 vol% PI@BCZT composites, which possess 1.025 μC/cm 2 under 50 kV/mm external electric field. In addition, after modification, thermo-gravimetric analysis exhibits the degradation temperature Td 5% and Td 10% of PI@BCZT/PVDF composites can be enhanced about 5–10 °C and show better thermal stability than un-modified composites.
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高影响因子
POLYMER
·
2024
·
IF 4.1
Hongnan Zhang,Taoyuan Liu,Ke Li,Xiaohong Qin
Nowadays, modern industries are rapidly developing, which is caused by a significant amount of high-temperature exhaust gases in the atmosphere, and it contains complex pollutants, formaldehyde, solid particles, and harmful gases that are discharged. For this scenario, the conventional filtering materials are challenged for prevention of high-temperature exhaust gas formaldehyde volatilization because they are composed of metal and inorganic materials caused by oxidation-prone and resilient wear. A recently introduced technique to fabricate composite nanofiber membranes with high strength, modulus, efficiency, low resistance for high-temperature exhaust gas filtering, and its capability to adsorb formaldehyde was discussed in this study. Initially, Polyamide acid (PAA) solution and silicon dioxide (SiO 2 ) nanomicrospheres are used as raw materials for producing electrostatic and thermal imidization Polyimide (PI/SiO 2 ) nanofiber membranes (NFMs) in co-spinning processes. Furthermore, zeoliticimidazolate framework-8 (ZIF-8) was transferred into PI/SiO 2 NFMs and produced the PI/SiO2@ZIF-8 NFM. These findings show that adding SiO 2 nanomicrospheres reduced the fiber packing density as well as air filtration resistance, and PI/SiO2@ZIF-8 NFMs achieve up to 99.703% filtration efficiency and maintain a pressure drop of 178.7 Pa. The weight loss rate is only 4% at temperatures above 300 °C, and the heat resistance is outstanding. Moreover, the PI/SiO2@ZIF-8 NFMs demonstrate a good formaldehyde adsorption performance with a saturation adsorption capacity for formaldehyde within 4 hours of 41.58 mg/g, which is more than 12 times that of the PI/SiO2 NFMs without ZIF-8.
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高影响因子
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