JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 6
·1-10
·
IF 2.8
Zhou Jintao,Zang Yue,Wang Yu,Chu Liang,Li Guodong,Xu Rui,Yan Wensheng
Silver nanowires have great development potential in the field of transparent electrodes, and their optoelectronic properties are closely related to the morphology and composition. During the synthesis of polyol method, the aspect ratio of AgNWs can be tailored using PVP with different molecular weights, and the diameter of AgNWs can be tuned by incorporating halides. Here, the synergistic effect of Cl − and Br − in the mixed PVP system were deeply investigated by adjusting the concentration ratio of Cl − and Br − . The growth mechanism of silver nanowires was studied by monitoring the acidity of the reaction process. It was found that under the assistance of PVP with different molecular weights, the coordination of Cl − and Br − greatly increased the activation energy of the reaction, which played a key role in the nucleation and growth of AgNWs. As a result, high-quality AgNWs with an average length of 35.7 μm and an average diameter of 67 nm were synthesized at the optimized concentration ratio of Cl − and Br − . Finally, the synthesized silver nanowires were deposited as conductive films on glass to obtain high-performance transparent electrode with a sheet resistance of 22.38 Ω/sq and transmittance of 83.95%.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Na Wang,Qilin Liu,Bo Xie,Xuechun Huang,Dan Xiao
Cr(VI) pollution severely threatens the water environment and human health. One of the effective ways to solve this problem is to develop environmentally friendly and efficient adsorbents. This paper proposes a highly efficient Cr(VI) adsorbent based on tannic acid coating PVA/PVP/PEI nanofibrous membrane. The adsorbent is environment-friendly and has satisfying water stability and adsorption performance. The optimum preparation conditions, adsorption conditions, and the influence of ionic strength and coexisting ions were investigated comprehensively. Through the study of adsorption kinetics and isotherms, the adsorption of Cr(VI) on the nanofibrous membrane was found following the pseudo-second-order kinetics model, and the adsorption isotherm model following the Langmuir model. The maximum adsorption capacities were 631.97 mg/g, 667.52 mg/g, and 695.04 mg/g at 298 K, 308 K, and 318 K, respectively. After adsorption of Cr(VI), the membrane can be converted to high purity Cr 2 O 3 by calcination. The tannin-coated PVA/PVP/PEI nanofibrous membrane is a promising adsorbent because it can efficiently adsorb Cr(VI) and convert highly toxic Cr(VI) into hypotoxic Cr(III).
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Liying Zhang,Pei Xie,Hang Wu,Jiulong Zhao,Shige Wang
Acute pancreatitis (AP) is a disease with high mortality which could cause an inflammatory responses such as edema and necrosis of the pancreatic tissue. Studies have proved that the excessive produced reactive oxygen species (ROS) and reactive nitrogen species (RNS) play an important role in the pathogenesis of AP. Although progresses have been made for ROS and RNS elimination using artificial enzymes, biocompatible nanomaterials with advanced multi-enzymatic activities have been rarely studied. In this study, we constructed a simple and efficient method to fabricate a two-dimensional (2D) MoSe 2 @PVP nanosheets (NSs) as an artificial enzyme to treat oxidative stress-related diseases. Both in vitro and in vivo experiments proved that MoSe 2 @PVP NSs have good biocompatibility. Interestingly, the MoSe 2 @PVP NSs simultaneously showed the thermal durable peroxidase, catalase, superoxide dismutase, and glutathione peroxidase mimicking capacities, which endowed the material with good ROS and RNS scavenging abilities. The MoSe 2 @PVP NSs were engaged in treating the AP in an animal model, which led to a significant down-regulation of serum levels of amylase, IL-6, IL-1β, and TNF-α. Further H&E staining of pancreatic tissue validated the AP therapeutic effect of MoSe 2 @PVP NSs. We hope that our research will facilitate the development of multifunctional artificial enzymes for the treating of oxidative stress-related diseases.
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POLYMER TESTING
·
2022
·
IF 4.931
Yuezhou Liu,Yanjing Liu,Xiyue Li,Yongfang Qian,Lihua Lv,Ying Wang
In order to fabricate antibacterial nanofiber membranes for tissue engineering field, the oxidative damage of magnesium hydroxide nanoparticles (Mg(OH) 2 NPs) against the model system of Escherichia coli ( E. coli ) was researched by measuring the oxidative stress response, oxidative stress products and glucose metabolism. The toxicity of Mg(OH) 2 NPs to a normal biological system was evaluated in vivo through the acute oral toxicity, blood physiological and serum biochemical markers and acute skin irritation, indicating that the Mg(OH) 2 NPs exhibited great biosafety. The Mg(OH) 2 NPs with antibacterial property and biosafety were loaded on PCL/PVP nanofiber substrates through electrospinning technology to fabricate the Mg(OH) 2 /PCL/PVP nanofiber membranes. The results of characterization and antibacterial test showed that the Mg(OH) 2 /PCL/PVP nanofiber membranes with 8.0 wt% Mg(OH) 2 NPs present excellent antibacterial rate of 100% against E. coli that the Mg(OH) 2 NPs can be physically and evenly loaded on nanofiber substrates.
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International Journal of Environmental Research and Public Health
·
2021
·Vol. 18
·期 23
·12339
·
IF 3.39
Chengzhi Zhou,Yanlong Sun,Fan Zhang,Yuandong Wu
The photocatalytic degradation of minocycline was studied by using polyvinylidene fluoride–polyvinylpyrrolidone–TiO2(PVDF–PVP–TiO2) fiber mats prepared by an electrospinning technology. The influences of the TiO2dosage, minocycline concentrations, inorganic anions, pH values, and dissolved organic matter (DOM) concentrations on the degradation kinetics were investigated. A mass of 97% minocycline was degraded in 45 min at 5% TiO2dosage. The corresponding decomposition rate constant was 0.069 min−1. The inorganic anions affected the minocycline decomposition in the order of HCO3−> Cl−> SO42−> NO3−, which was confirmed by the results of electron spin resonance (ESR) spectra. The lowest electrical energy per order (EEO) was 6.5 Wh/L. Over five cycles, there was no change in the photocatalytic performance of the degrading minocycline. Those investigations suggested that effective degradation of minocycline could be reached in the PVDF–PVP–TiO2fiber mats with a low energy consumption, good separation and, good recovery. Three photocatalytic decomposition pathways of minocycline were proposed: (i) hydroxyl substitution of the acylamino group; (ii) hydroxyl substitution of the amide group, and (iii) a cleavage of the methyl groups and further oxidation of the amino group by OH. Potential risks caused by TP159 and TP99 should not be ignored, while the TP90 are nontoxic. Tests indicated that the toxicity of the photocatalytic process may be persistent if minocycline and its products were not mineralized completely.Keywords:electrospinning;minocycline;photocatalytic oxidation;PVDF–PVP–TiO2fiber mats;degradation mechanism
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Jin-Tao Du,Hao Niu,Hao Wu,Xiao-Fei Zeng,Jie-Xin Wang,Jian-Feng Chen
Ammonia borane (AB) is considered to be a promising solid hydrogen carrier. In this work, poly(N-vinyl-2-pyrrolidone) (PVP)-protected platinum nanoparticles are supported on γ-methacryloxypropyltrimethoxysilane (γ-MPS) modified silica spheres (Pt-PVP/SiO 2 (M)), which are firstly used as highly efficient catalysts for hydrolysis of AB. Platinum nanoparticles possess a tiny size of 2–3 nm and are uniformly dispersed over modified silica spheres. Pt-PVP/SiO 2 (M) catalysts with a Pt loading amount of 1.30 wt% show the highest catalytic activity with a turnover frequency (TOF) value of 371 mol H2 mol Pt −1 min −1 (866 mol H2 mol Pt −1 min −1 corrected for the surface atoms) at 25 °C. The activation energy is calculated to be 46.2 kJ/mol. Furthermore, owing to the synergistic effect between the modifier of silica spheres and the capping agent of metal nanoparticles , Pt-PVP/SiO 2 (M) catalysts have a higher loading amount (8.7 and 6.5 times) and TOF value (4.8 and 5.5 times) than the counterparts prepared without γ-MPS and PVP, respectively.
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Crystals
·
2021
·Vol. 11
·期 5
·459
·
IF 2.589
Yuchen Liu,Kousuo Dong,Linsheng Bian,Zisheng Guan
Inverted pyramid-texturing of silicon surface has been proven to have great application potential in silicon solar cells. In this paper, we utilized Ag-assisted chemical etching (Ag–ACE) technology combing with polyvinylpyrrolidone (PVP) to fabricate an inverted pyramid textured Si surface. We call it Ag@PVP–ACE. The effect of different experimental parameters on etching results was observed. We show that the microstructure of the Si surface exhibited two states as the concentration of NH4HF2and PVP concentration changed: polishing and inverted pyramid texturing. Meanwhile, we found inverted pyramids easier to form at the high temperature and low H2O2concentration of the etching system. Consequently, compared to inverted pyramid structures fabricated by nanostructure rebuilding (NSR) technology and Ag@PVP–ACE, we consider that Ag@PVP–ACE technology could become a viable strategy for fabricating inverted pyramid textured Si wafers in Si solar cells production.Keywords:inverted pyramid;metal-assisted chemical etching;synergism;textured single crystalline silicon wafers
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JOURNAL OF NANOBIOTECHNOLOGY
·
2020
·Vol. 18
·期 1
·1-13
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IF 6.518
Wu Yiyong,Deng Peihong,Tian Yaling,Feng Jinxia,Xiao Jingyun,Li Junhua,Liu Jun,Li Guangli,He Quanguo
A method with high sensitivity, good accuracy and fast response is of ever increasing importance for the simultaneous detection of AA, DA and UA. In this paper, a simple and sensitive electrochemical sensor, which based on the polyvinylpyrrolidone (PVP)-graphene composite film modified glassy carbon electrode (PVP-GR/GCE), was presented for detecting ascorbic acid (AA), dopamine (DA) and uric acid (UA) simultaneously. The PVP-GR/GCE has excellent electrocatalytic activity for the oxidation of AA, DA and UA. The second-order derivative linear sweep voltammetry was used for the electrochemical measurements. The peak potential differences of DA-AA, DA-UA, and UA-AA (measured on the PVP-GR/GCE) were 212, 130 and 342 mV respectively. Besides, the over potential of AA, DA and UA reduced obviously, so did the peak current increase. Under the optimum conditions, the linear ranges of AA, DA and UA were 4.0 μM–1.0 mM, 0.02–100 μM, and 0.04–100 μM, respectively. The detection limits were 0.8 μM, 0.002 μM and 0.02 μM for AA, DA, and UA. The electrochemical sensor presented the advantages of high sensitivity and selectivity, excellent reproducibility and long-term stability. Furthermore, the sensor was successfully applied to the analysis of real samples.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Zhengjie Chen,Chengchen Feng,Lin Jiang,Yujie Ke,Xiaoxue Han,Xinghai Liu
Smart window promises to enhance the building energy efficiency by dynamically controlling the indoor solar irradiation. In this study, a new thermochromic smart films for smart window applications were proposed. This film is based on polyvinylpyrrolidone (PVP)-coated tungsten-doped VO 2 (W-VO 2 ) and polyurethane acrylate (PUA). It is demonstrated that the PVP-coating technique plays a vital role in improving the optical properties of the film and the dispersion of W-VO 2 in PUA. The optimized 3D-printed Kirigami-structured films exhibit favorable tensile properties and improved optical properties. Furthermore, an innovative device has been developed to enable automatic adjustment of the film stretch rate in response to the angle of sunlight, ensuring the smart window's dynamic response to sunlight. The film's solar transmittance varies between 48.50 % and 78.56 % during stretching, accompanied by a solar modulation up to 30.05 %. In the indoor and outdoor demo experiments, the temperature drops by 5.2 °C and 4.8 °C, respectively, compared to a PUA film window. The work developed a new film for energy-efficient smart windows and provides a systematic technological route from materials synthesis, structural optimization, system digital control, to practical demo assessment, which promises to facilitate the development of VO 2 -based materials and energy-efficient windows.
研究领域:
材料科学
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能源技术
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建筑科技
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Kebing Chen,Jie Ren,Guo-Xing Li,Qing Li,Yixin Zhou,Xiao-Qing Yu,Chang Liu,Su Chen
Radiative cooling provides a supplement to traditional active energy-intense cooling. Recently, photonic designs have emerged to realize efficient daytime radiative cooling (DRC) based on high emission in the mid-infrared and reflectance in the solar spectrum. However, such technologies tend to be costly and suffer from complex processes, which significantly limit their application. Herein, a polyvinylidene difluoride/polyvinylpyrrolidone-(hollow aluminum phosphate microspheres) (PVDF/PVP-(H-AlPO4)) dual-layer composite fiber film was prepared via a straightforward and cost-effective microfluidic electrospinning technique, combining multieffect cooling, including thermal isolation, solar reflection, and a self-pumping process. The incorporation of hollow aluminum phosphate microspheres (H-AlPO4) in the polymer matrix enhances the mechanical properties and overall scattering ability. Promisingly, the PVDF/PVP-(H-AlPO4) dual-layer composite fiber film ensures the desired DRC performance, achieves a high emissivity of 91.46% in the atmospheric window, and reflects 94.76% of the solar radiation. In outdoor environments under 605 W/m2 solar radiation, the dual-layer composite fiber film obtains an average 3.1 °C subambient cooling temperature, with the highest cooling temperature reaching 6.4 °C. We believe that this study not only provides an efficient method for preparing DRC fiber films with photonic structures but also offers a potential solution for the design of radiative cooling materials and lays a solid foundation for its practical application.
研究领域:
材料科学
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纳米技术
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光学
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热工学
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高分子科学
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POLYMER
·
2024
·
IF 4.1
Aowen Huang,Chen Dong,Yiren Gao,Lu Liu,Xiaoshan Yan,Panchao Yin
The perfluorosulfonic acid (PFSA) polymers have achieved great success as proton exchange membranes (PEMs) in various energy storage and conversion devices; nevertheless, the improvements regarding PEMs' synthetic cost, mechanical properties, stability and processability are still urgently required. Herein, 1 nm super acidic metal oxide cluster, H 3 PW 12 O 40 (PW 12 ), is complexed with the blends of polyvinylpyrrolidone (PVP) and polyvinylidene fluoride (PVDF) to afford nanocomposite PEMs that enables the stable and effective operation of hydrogen fuel cell devices. As the polymer matrix , the PVDF is blended with PVP via inter-chain hydrogen bonding to provide mechanical support for the nanocomposite PEMs. The further introduced PW 12 clusters can interact strongly with PVP via electrostatic attraction to enhance the PEMs' mechanical strength (E = 231 MPa) and prevent the leaching of PW 12 for long-term stability. Meanwhile, the incorporation of the super acidic PW 12 can facilitate the fast proton transportation and therefore, lead to the significant increasement of proton conductivity to 9.8 × 10 −3 S cm −1 at 70 °C and 100% RH. Due to the excellent mechanical properties and the supramolecular interaction among the components, the PEMs’ thickness can be controlled to be challenging ∼10μm for feasible large-scale continuous processing. Finally, the molecular design enables the successful fabrication of the nanocomposite PEMs into fuel cell devices with the power density as 342.8 mW cm −2 . The studies not only shed light on the structure-properties of polymer nanocomposites , but also pave avenues to the design of robust composite PEMs for fuel cell appliacations.
研究领域:
材料科学
·
能源工程
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 11
·3957-3968
·
IF 7.393
Qiao Li,Shanyong Chen,Hong Yu,Jinlei Chen,Xingwu Yan,Lu Li,Maowen Xu
Core–shell structure can endow silver nanowire (AgNW) with excellent stability. However, its application is greatly hindered by non-industrial preparation process and bad dispersity of the present passivation shell layer. Polymer shell material can solve these problems but no researchers have adopted because apart from removing the polymer, there is no method which can overcome the conductivity limit of the insulating polymer at present. Herein, inspired by the tunnel effect of scanning tunneling microscope, we report a tunneling-current junction welding strategy which can preserve the polymer and overcome its conductivity limit simultaneously: (1) the key point for overcoming the conductivity limit is controlling the polymer thickness to generate tunneling current; (2) because the junction resistance is much higher than the nanowire resistance and Joule heat mainly accumulates on the inside of the junction, fixed-point junction welding can be realized to merely remove polymer on the inside of the junction to fuse AgNWs and the polymer in other places can be preserved. Based on this strategy and a welding law refined by us, silver@polyvinylpyrrolidone core–shell (Ag@PVP) nanowire film is welded and the results demonstrate that this strategy is effective. Ag@PVP film exhibits good stability and high opto-electrical performance, indicating that PVP shell layer greatly improves the stability of AgNW but hardly affects its opto-electrical performance. Finally, an optoelectronic device employing the Ag@PVP film as the electrode is fabricated and shows efficiencies comparable to those of an optoelectronic device on indium tin oxide.
研究领域:
材料科学
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纳米技术
·
电子工程
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