INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Xu Zhang,Rui Hou,Jun Zhang,Qin Meng,Chong Shen,Guoliang Zhang
In this study, novel polymers of intrinsic microporosity (PIMs)-based hollow fiber structured packings were prepared by a facile pour-coating method and successfully applied as structured packings for isopropanol (IPA)/water distillation. The design of an ultrathin PIM-1 layer on the inner surface of hollow fibers effectively protected the membrane from mechanical damage, especially when assembled into the module. Based on the material properties and specific polymer chain structures, the hydrophobic PIM-1 layer made composite membranes to not only have a strong affinity for alcohols and moisture resistance but also possess a large surface area and excellent stability, which effectively decreased the membrane resistance and promoted the fast membrane transfer rate during the distillation process. The prepared PIM-1/PAN hollow fiber structured packings with a controllable defect-free PIM-1 layer down to 34 nm can be easily operated far beyond the normal flooding limit and achieve a very low height of a mass transfer unit (HTU) of 4.0 cm.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Zongjie Li,Yihan Lu,Tengfei Li,Yongyao Xiao,Yafang Li
Recently, significant attention has been directed towards piezoelectric nanogenerators (PENGs), serving as nanoscale devices for energy harvesting, in the realm of providing power to wearable electronics. However, the limited power output of PENGs has significantly impeded their widespread application. To address this issue, the present study successfully developed a ZIF-8 functionalized polyacrylonitrile/tetrabutylammonium hexafluorophosphate nanofiber membrane (ZIF-8@PAN/TBAHP-NM) with the aim of enhancing the energy harvesting efficiency of PENGs. The process entails the in-situ growth of ZIF-8 crystals onto the surfaces of PAN/TBAHP nanofibers. The experimental results show that the proportion of the planar zigzag conformation within the nanofiber membrane rises to 71.61 % upon the addition of TBAHP to pure PAN. Furthermore, the incorporation of ZIF-8 nanoparticles led to an increase in the proportion of the planar zigzag conformation to 79.60 %, thereby significantly enhancing the electromechanical energy conversion efficiency. The resultant PENGs exhibited a current output of approximately 2.5 μA and a voltage output of 14.8 V, marking an enhancement of 7.3 times and 4.9 times, respectively, compared to pure PAN nanofiber membranes. During a 5000-s durability test, the device maintained a stable electrical signal output, demonstrating robust durability. Additionally, simulations encompassing actions like walking, running, and jumping have further demonstrated the superior performance of piezoelectric nanosensors in tracking human motion, thereby laying the groundwork for advancements in the field of wearable electronics.
研究领域:
纳米技术
·
能量收集
·
可穿戴电子设备
·
材料科学
·
传感器
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Tong Yang,Hui Yang,Shu Jun Zhen,Cheng Zhi Huang
Reproducibility in surface enhanced Raman scattering (SERS) measurements is a challenge. This work developed a facile way to make highly dispersed uniform silver nanoparticles (AgNPs) loaded in the agar/polyacrylonitrile (PAN) nanofibers by the coupling the electrospinning technology from metal complex-containing polymer solution and in situ photoreductive technique. Agar, as hydrophilic component, was introduced into the electrospinning solution considering that its abundant hydroxyl group sites could greatly improve the contents of silver ions in the polymers because of the rich silver ion chelated with the hydroxyl group, whereas hydrophilic agar was integrated with hydrophobic PAN by −OH···N≡C– hydrogen bonds as a bridge. Meanwhile, the in situ photoreductive reaction was made under different light irradiations such as desk lamp, 365 nm UV-lamp, and 254 nm UV-lamp. High yield of stable AgNPs with highly uniform and dispersion are available in the agar/PAN nanofibers after the in situ photoreductive reaction, supplying the possibility of reproducible SERS signals. To identify that concept of proof, a facile approach for the determination of malachite green (MG) in three environmental practical samples was demonstrated by using the composite nanofibrous material irradiated by 365 nm UV-lamp, giving the minimum detection concentration of MG as low as 0.1 μmol/L with a good linear response ranging from 0.1–100 μmol/L (R2 = 0.9960).
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 42
·425601
·
IF 3.953
Wenwu Jiang,Yi Han,Yanhuai Ding
Electrospun PAN/PVdF-HFP membranes have the potential to be used as separators for Li-ion batteries owing to their good mechanical properties and high chemical stability. However, the application of PAN/PVdF-HFP separators has been hampered by their poor electrochemical performances. In this study, semi-aligned PAN/PVdF-HFP nanofiber separators have been fabricated by an electrospinning technology. Sepiolite and ZIF-67 co-modification was employed to enhance the physical properties of the PAN/PVdF-HFP separators. The test cells with the as-prepared composite separator showed better electrochemical performance than the commercial and raw PAN/PVdF-HFP separators.
研究领域:
材料科学
·
能源存储
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 1
·e70068
·
IF 3.4
Hailong Zhang,Ruimeng Li,Haishui Xu,Ling Quan,Chengyu Zhan,Peng Han,Kehan Xu,Yuping Tong
The accumulation of copper ions in the environment can devastate the ecological systems and threaten the health of organisms. Consequently, the development of effective adsorbents to extract Cu 2+ from aqueous solutions is urgently needed. Here, the Zeolitic Imidazolate Framework-8 (ZIF-8)/polyacrylonitrile (PAN) nanocomposite fibers were synthesized by electrospinning and further characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). ZIF-8 powders were uniformly distributed on the surface of the nanocomposite fibers, and amide CO NH bonds were formed between the NH 2 groups of ZIF-8 and the CO groups of PAN. The ZIF-8/PAN nanocomposite fibers demonstrated an exceptional Cu 2+ adsorption capacity of 275.7 mg g −1 at pH = 4.0. The adsorption process adhered to the pseudo-second-order kinetics and the Langmuir isotherm model. The adsorption mechanism, as conformed by FTIR and X-ray photoelectron spectroscopy (XPS) analysis, involves the coordination of the NH 2 and CO groups with Cu 2+ and the ion exchange processes between Cu 2+ and Zn 2+ for the nanocomposite fibers. This study provides a novel approach for the removal of Cu 2+ from aqueous solutions and addresses the challenge of recovering powder materials in wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Yan Hongsheng,Xiong Jie,Du Peijian,Wu Ermiao,Pan Tiandi,Li Ni
The construction of semiconductor heterojunctions is an effective way to enhance the photocatalytic activity. In this work, n–p heterojunction composed of ZnO nanorods and polypyrrole (PPy) nanospheres were loaded on polyacrylonitrile (PAN) nanofibers to fabricate ZnO/PPy/PAN nanofiber membranes (ZnO/PPy/PAN NFMs) via electrospinning, hydrothermal synthesis and chemical polymerization. The results showed that the photodegradation rate of ZnO/PPy/PAN NFM was about 4.8 times higher than that of ZnO/PAN NFM. Moreover, the membrane exhibited good cycling stability, which maintained the removal efficiency of rhodamine (RhB) at 79% after five cycles. The enhanced photocatalytic activity was mainly ascribed to the synergistic effect of PAN nanofibers adsorption and n–p heterojunctions catalysis, resulting in a narrow bandgap, an increase in the absorption of visible light and the separation efficiency of electron–hole. Meanwhile, the degradation mechanism of ZnO/PPy/PAN NFMs was proposed. This work provides a promising strategy to construct n–p heterojunction photocatalysts for removing organic pollutants in wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yinyin Peng,Ting Pan,Chuang Chen,Yuchen Zhang,Guoyuan Yuan,Derong Liu,Xiaoqin Pu,Wei Xiong
In this study, researchers developed a novel composite material called NH2-MIL-53-Al/PAN, which consists of metal–organic frameworks (MOFs) grown on electrospun PAN nanofibers (NFs). The successful formation of the composite was confirmed by X-ray diffraction (XRD) and Fourier transform infrared (FTIR), and the hydrophilicity of NH2-MIL-53-Al/PAN was demonstrated by the water contact angle (WCA). Batch experiments were conducted to investigate the adsorption performance of Co(II) under different conditions. The maximum adsorption capacity reached 58.72 mg/g, and almost 95% of the adsorption was achieved within the first 6 h. The adsorption process was found to be spontaneous and endothermic and followed the pseudo-second-order kinetics and Langmuir models. Chemisorption and molecular layer adsorption are the main mechanisms of adsorption, and X-ray photoelectron spectroscopy (XPS) analysis further reveals that the interaction between the adsorbent and cobalt is a coordination interaction. In this study, NH2-MIL-53-Al was grown in situ on PAN to ensure effective loading of MOFs and prevent agglomeration during the NF mixing process. This approach successfully addressed the challenge of exposing active sites within the embedded MOF crystals. Additionally, it overcame the difficulty of recycling traditional MOF adsorbents. As a result, the exceptional performance of MOF NFs offers a promising solution for the efficient removal of cobalt-containing wastewater.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Junxia Guo,Ming Gao,Jun Nie,Fengxiang Yin,Guiping Ma
Metal-organic frameworks (MOFs) derived materials have been used as promising eletrocatalysts. However, the aggregation and poor conductivity are still obstacles for those eletrocatalysts. Herein, an effective method has been developed to overcome this problem by in-situ growth of ZIF-67 nanocrystals on the PAN fibers (ZIF-67/PAN) followed by the pyrolysis of ZIF-67/PAN fiber in 800 °C (ZIF-67/PAN-800). The obtained nanocomposite fibers showed that the isolated metal particles were anchored and linked up by carbon fibers, leading to elevated conductivity, preventing metal particles migration, and increasing stability. Such network structure provides facile pathways for efficient mass transport and shortens the electronic transmission path. As evidences, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic tests in this study both showed that ZIF-67/PAN-800 had an excellent bifunctional electrocatalytic activity in alkaline electrolyte . This strategy may give on a new way to synthesis electrocatalytic nanocomposite fibers.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Lu-Ye Yang,Jian-Hua Cao,Bo-Ran Cai,Tian Liang,Da-Yong Wu
A composite separator is prepared with polyacrylonitrile (PAN) and metal-organic framework (MOF) particles by electrospinning, and its physical properties, battery performances and the mechanism of how it improves the performance of high energy density lithium battery are studied. The MOF/PAN separator shows an outstanding thermal stability, an ultra-high electrolyte uptake (794±30%), a high ionic conductivity (2.83 mS cm −1 at 25 °C) and a wide electrochemical window (5.2 V vs. Li + /Li). The Li||separator||Li half-cell can operate stably for 1000 h at 5 mA cm −2 . A strong electrostatic interaction between MOF and PF 6 - in the electrolyte inhibits movement of the anions and enhances the Lithium-ion transference number ( t L i + ) up to 0.74, which is 64.4% higher than that of PAN separator. After 200 cycles at 0.2 C, the interfacial resistance between separator and electrode only increases from 22.00 to 30.58 Ω. The initial discharge capacity of the NCM811||10% MOF/PAN separator||Li battery system is 166.3 mAh g −1 with 81.3% capacity retention after 250 cycles at 5 C. This research offers an idea to design MOF-based composite separator that makes NCM811||Li battery outstanding in electrochemical stability and high rate performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yongzheng Shi,Dongzhi Yang,Yuan Li,Jin Qu,Zhong-Zhen Yu
Although TiO 2 -based photocatalysts have exhibited a great potential for degradation of organic pollutants, it is still necessary to simultaneously enhance their visible-light-driven photocatalytic efficiency and physical recyclability. Herein, highly efficient, visible-light-driven photocatalytically active, and recyclable nanofibrous membranes with thin TiO 2 /Ag heterojunction layer are prepared using electrospun polyacrylonitrile (PAN) nanofibrous membrane as the substrate. By regulating the concentration and hydrolysis process of Ti precursors, TiO 2 nanoparticles steadily grow on the PAN nanofibers with high-specific surface area to form a continuous mesoporous shell with the thickness of 20 nm for efficient degradation of organic pollutants. Furthermore, to form a stable heterojunction structure, Ag nanoparticles are deposited on the TiO 2 surface by using dopamine as a binder and reductant. The presence of Ag nanoparticles leads to an obvious red-shift from 380 nm to 490 nm, which improves the utilization efficiency of visible light, and reduces the electron/hole recombination rate simultaneously. The resulting PAN@TiO 2 /Ag membranes hold enhanced photocatalytic activity for methylene blue degradation within 1 h under visible light irradiation, and satisfactory recyclability, which endow them with a great potential for adsorption and photocatalytic applications.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 9
·3007-3017
·
IF 2.5
Chen Yatian,He Bin,Chen Qiufei,Malik Hamza,Zhu Hongqiang,Wang Yuhang,He Jian,Ma Bomou,Wang Xueli,Zhang Hui,Liu Yong
The effects of KBrO 3 modification on polyacrylonitrile (PAN) precursor fibers at different modification temperatures were studied. The mechanical properties, chemical structure, aggregation structure, morphological structure, and thermal behavior of PAN precursor fibers were analyzed. The mechanical properties of PAN precursor fibers are essentially unaltered after KBrO 3 modification, although oxygen-containing functional groups are introduced. KBrO 3 can ionize bromate ion in aqueous solution, which has good nucleophilicity and can attack the positively charged carbon atom in C≡N, so that the cyclization proceeds according to the ionic mechanism, allowing the transformation of C≡N to C = N in the PAN precursor fibers generated a cyclic trapezoidal structure containing primary aromatic amine, which reduced the peak temperature of the cyclization reaction from 284.5 °C to 275.1 °C and decreased the heat release. The sp3-hybridized carbon structure changes into a sp2 hybridized C = C structure with increasing aromatization, according to XRD and Raman data, and the KBrO 3 alteration accelerates the degradation of the original microcrystalline structure and transforms into a new polycyclic aromatic structure. The degree of conjugation and aromatization of the system rapidly increased with the rise in modification temperature. The stabilized fibers were discovered to have the lowest R-value, the highest aromatization, the smoothest surface, and the fewest flaws at impregnation temperature of 60 °C.
研究领域:
材料科学
·
高分子化学
·
纤维科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 7
·2945-2953
·
IF 2.817
Gong Xiaodong,Luo Huan,Liu Gang,Luo Cong,Niu Yanhua,Li Guangxian
The gel polymer electrolytes (GPEs) with poly(acrylonitrile-polyhedral oligomeric silsesquioxane)/poly(vinylidene fluoride) (PAN-POSS/PVDF) blends as free-standing porous membrane and ionic liquid (IL) as absorption substance were successfully prepared. By tuning the content of PAN-POSS, the porosity and absorptivity of the blended membranes could be regulated. Due to the higher porosity and absorptivity, the ionic conductivity of GPEs with 15 wt% PAN-POSS reaches to 1.91 × 10 −3 S cm −1 at 20 o C. Meanwhile, the electrolytes also show excellent mechanical properties, thermal stability, and fire resistance. More importantly, the high electrochemical window of 4.6 V (vs. Li/Li + ) has been acquired and the testing cells with Li metal anode and LiFePO 4 cathode show a tolerable rate performance. Such prepared GPEs are expected to be applied to lithium batteries with high safety and electrochemical performance.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）