JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Jingxian Hua,Chang Li,Hongxu Tao,Lei Wang,Eryue Song,Haiqian Lian,Chongqing Wang,Jinlong Jiang,Yichang Pan,Weihong Xing
Polymer coating post-treatment strategy of the zeolitic imidazolate framework (ZIF) membranes offers a versatile and feasible opportunity to restrict the intrinsic flexibility of ZIF framework and improve their gas separation performance. Herein, two different coating methods (Vacuum-assisted drip coating (VADC) and Static drip coating (SDC)) are utilized to prepare PDMS/ZIF-8 composite membranes based on ZIF-8 membranes with different compactness (high, medium and low-quality membrane) for investigating the effect of the contact area between PDMS layer and ZIF-8 membrane on C 3 H 6 /C 3 H 8 separation performance of PDMS/ZIF-8 composite membranes. The results reveal that the increase of the contact between PDMS layer and ZIF-8 membrane can enhance the contact confinement effect on the flexibility of ZIF-8 framework, resulting in a higher improvement of the separation performance for C 3 H 6 /C 3 H 8 of PDMS/ZIF-8 composite membranes with pressure. The prepared composite membrane based on VADC method showed a significant improvement in C 3 H 6 /C 3 H 8 separation factor (77–102) with slight increase in C 3 H 6 permeance (about 10%) at feed pressure of 7 bar. Moreover, this facile vacuum-assisted drip strategy attenuated the impact of the quality of ZIF-8 membranes on fabrication reproducibility of the composite membranes, which can withstand high pressure. Therefore, this work advances ZIF-8 membrane moving forward to industrial C 3 H 6 /C 3 H 8 separation.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ANALYST
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2021
·Vol. 146
·期 23
·7168-7177
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IF 4.616
Bingyong Lin,Yuanyuan Yao,Yueliang Wang,Palanisamy Kannan,Lifen Chen,Longhua Guo
The uneven distribution of metal nanoparticles is a vital influencing factor in the poor uniformity of surface-enhanced Raman scattering (SERS) substrates, which is a challenge in SERS quantitative analysis. Recent reports showed that the reproducibility of a nonuniform SERS substrate can be effectively improved by the use of an internal standard (IS). However, most of these approaches require the investment of time for precise regulation, and those approaches based on the addition of an IS are specific to a certain substrate. In this work, we proposed a simple, rapid and universal method to incorporate an IS into a SERS substrate for improving the reproducibility of Raman signals based on the systematic evaluation of the influencing factors of the competitive adsorption between the IS and the target analytes. Following the proposed pressure drop-coating (PDC) method, an IS-modified gold nanobipyramids (Au NBPs)/anodic aluminum oxide (AAO) SERS substrate was fabricated within 1 min, showing high reproducibility of Raman signals. In addition, the IS-modified Au NBPs/AAO SERS substrate was successfully applied to analyze thiram in freshly squeezed apple juice and the result showed a stable Raman signal with a relative standard deviation of less than 6.00%. What is more, three different commercial SERS chips were modified with an IS molecule using the PDC method. Compared to the traditional SERS chips, the Raman signal reproducibility of the functionalized SERS chips was improved significantly. Since the addition of an IS is not based on a certain substrate, the proposed approach could be useful for all the researchers working in the field of SERS.
研究领域:
分析化学
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材料科学
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纳米技术
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Yapeng Yao,Xiaodong Gou,Wei Liu,Zihang Liang,Jiangbo Zhang,Zhongliang Ma
Integrating energetic materials into microelectromechanical system (MEMS) to enhance their energy output characteristics has shown extensive potential across aerospace, defense, and civilian applications. Within this study, the MEMS compatible Cu/DNBT (DNBT = [5,5′-dinitro-3,3′-bi(1,2,4-triazole)]) and Cu/DNBT@nano-Al energetic films were successfully synthesized on the copper substrate using an electrochemical method and a drip coating method. The scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential thermal analyses (DTA), and a pulse laser ignition test were used to analyze the morphology, composition, thermal performance, and ignition properties of the prepared samples. The findings indicate that the prepared Cu/DNBT and Cu/DNBT@nano-Al energetic films exhibit a nanostructure, and their morphology can be effectively regulated via modifications to the deposition voltage, deposition time, and aluminum plating frequency. Furthermore, the energetic properties of Cu/DNBT@nano-Al films can be adjusted after the deposition of nano-Al. Their heat release, flame height and ignition duration can reach up to 1823.1 J·g–1, 13.5 mm, and 400 μs, respectively. These findings suggest that Cu/DNBT@nano-Al energetic films being a prime contender for initiating powders in MEMS pyrotechnics. In summary, this work offers valuable insights into the integration and application of energetic materials in MEMS ignition devices.
研究领域:
材料科学
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化学工程
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机械工程
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航空航天工程
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国防技术
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2018
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IF 2.906
Bo Lin,Jian Chen,Zeng-Tian Li,Fu-An He,De-Hao Li
In this work, the fluoroalkylsilane-modified SiO 2 nanoparticles (NPs) were immobilized on the polyurethane sponges by a highly efficient drop-coating method using different polymers including poly(vinylidene fluoride), poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene), polystyrene , and polyurethane as the adhesives to achieve the superhydrophobic modification of the polyurethane sponges for oil-water separation. The successful fluoroalkylsilane modification for the SiO 2 NPs was confirmed by TEM, SEM , FITR, XPS, and TGA. Furthermore, the surface-modified polyurethane sponges were investigated by SEM and two-dimensional EDS mapping. The contact angles of the surface-modified polyurethane sponges were in the range of 151.6°–154.3°, which confirmed the realization of the superhydrophobic modification for the polyurethane sponges. The demonstration experiments showed that the resulting surface-modified polyurethane sponge could effectively remove oil from the oil-water mixture by direct absorption or gravity-driven filtration. Moreover, the surface-modified polyurethane sponges possessed not only high absorption capability for different oils including peanut oil, pump oil, and silicone oil but also good reusability . We believe that such novel surface-modified polyurethane sponges might be potential candidates for the oil-water separation.
研究领域:
材料科学
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环境工程
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纳米技术
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表面化学
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分离科学
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DOI
高影响因子
Nanoscale
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2025
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IF 5.1
Jinfu Liang,Erhai Hu,Ruina Zhang,Chen Zhou,Liang Ren,Lifei Meng,Yanshuo Li,Qingyu Yan,Wentao Hu,Wei Fang
This work developed flexible porous carbon fiber composite electrodes (Pt@C-PES cathode/RuO2@C-PES anode) for hydrogen and chlorine evolution reactions (HER/CER) in acidic NaCl electrolyte (1 M HCl + 5 M NaCl). Functionalized with Pt and RuO2 via electrodeposition and drop-coating, the electrodes demonstrated low overpotentials of 71 mV@25 mA cm-2 (HER) and 77 mV@25 mA cm-2 (CER). Applied in a two-electrode H-cell system, Faradaic efficiencies of 99.14% (HER) and 98% (CER) were achieved at a current density of 25 mA cm-2, and 30 mL of iodine solution (66.25 mmol L-1) was obtained within 5 hours for extensive sterilization (5 types of bacteria). As antibacterial electrodes, in-situ generated active chlorine enabled 100% inactivation of Staphylococcus aureus within 30 minutes. The porous structure, good hydrophilicity and mechanical flexibility of the electrodes enhanced electrolyte penetration, catalytic activity and wearability. This study provides a high-performance flexible electrode for acidic NaCl electrolysis, reducing energy consumption while broadening applications in hydrogen/chlorine production and antibacterial applications.
研究领域:
电化学
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材料科学
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能量转换
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环境科学
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生物医学工程
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DOI
PubMed
高影响因子
ACS Applied Energy Materials
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2021
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IF 6.024
Li Gong,Jun-Sen Zhang,Cheng Wang,Hao Fu,Yang-Fan Lu,Jian-Lin Chen,Jin-Cheng Fan,Zi-Sheng Chao
In this paper, the ion substitution mechanism of CsPbIBr2 films prepared by a drop-coating method is studied. CsI/CsBr methanol solution is drop-coated on a CsPbIBr2 precursor film to prepare the CsPbIBr2 perovskite film. After drop-coating, it is found that the color of the perovskite film changes with CsI/CsBr methanol solution drop-coated on the perovskite precursor film. When CsBr methanol solution is drop-coated on a CsPbIBr2 precursor film, the color of the obtained CsPbIBr2 film is orange. The color of the obtained CsPbIBr2 film is brown while CsI methanol solution is drop-coated on a CsPbIBr2 precursor film. Then, the hole-free, carbon-based CsPbIBr2 perovskite solar cells (FTO/ZnO/CsPbIBr2/C) are fabricated. For the solar cells fabricated by drop-coating with 30 μL of CsBr, without methanol solution, with 10 μL of CsI, with 50 μL of CsI, and with 90 μL of CsI, the power conversion efficiency (PCE) values are 2.98, 3.99, 6.04, 7.60, and 8.42%, respectively. The short-circuit current density (JSC) also increases with the changing of drop-coating solution. Therefore, we suppose that perhaps there is an ion substitution during the preparation of the CsPbIBr2 films. The ion substitution supposition is verified by the results of X-ray diffraction, ultraviolet–visible spectra, X-ray photoelectron spectroscopy, and secondary ion mass spectroscopy. Specifically, the I element is replaced by the Br element while drop-coating CsBr methanol solution. The Br element is substituted by the I element by drop-coating CsI methanol solution. Also, it is verified that the ion substitution occurs in the entire perovskite film.
研究领域:
材料科学
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化学
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物理学
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太阳能
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DOI
高影响因子
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