Electrospinning preparation, energetic characteristics and reaction mechanism of corrosion-resistant Si@PVDF nanostructured energetic films

Zhang, Chun; Mao, Huiqing; Cui, Rui; Zhang, Xiandie; Yang, Jing; Ji, Jie; Zhou, Xiang

doi:10.1016/j.combustflame.2021.111887

Cited by 19 publications

(5 citation statements)

References 36 publications

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“…Figure 11 b shows the FTIR spectra of the EPS, ENM, and EPS–ENM samples. More specifically, in the case of the EPS–ENM sample, three strong peaks were observed at 1402, 1167, and 882 cm −1 , which correspond to the C–H, C–F, and C–C moieties of PVDF ENM, respectively [ 69 , 74 ]. Meanwhile, two strong peaks were found at 1658 and 1539 cm −1 , which correspond to the C=O and COO − groups of EPS, respectively.…”

Section: Resultsmentioning

confidence: 99%

Recovery of Extracellular Polymeric Substances from Excess Sludge Using High-Flux Electrospun Nanofiber Membranes

et al. 2023

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The recycling of extracellular polymeric substances (EPSs) from excess sludge in wastewater treatment plants has received increasing attention in recent years. Although membrane separation has great potential for use in EPS concentration and recovery, conventional membranes tend to exhibit low water flux and high energy consumption. Herein, electrospun nanofiber membranes (ENMs) were fabricated using polyvinylidene fluoride (PVDF) and used for the recovery of EPSs extracted from the excess sludge using the cation exchange resin (CER) method. The fabricated ENM containing 14 wt.% PVDF showed excellent properties, with a high average water flux (376.8 L/(m2·h)) and an excellent EPS recovery rate (94.1%) in the dead-end filtration of a 1.0 g/L EPS solution at 20 kPa. The ENMs displayed excellent mechanical strength, antifouling properties, and high reusability after five recycles. The filtration pressure had a negligible effect on the average EPS recovery rate and water flux. The novel dead-end filtration with an EPS filter cake on the ENM surface was effective in removing heavy-metal ions, with the removal rates of Pb2+, Cu2+, and Cr6+ being 89.5%, 73.5%, and 74.6%, respectively. These results indicate the potential of nanofiber membranes for use in effective concentration and recycling of EPSs via membrane separation.

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Section: Resultsmentioning

confidence: 99%

Recovery of Extracellular Polymeric Substances from Excess Sludge Using High-Flux Electrospun Nanofiber Membranes

et al. 2023

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“…The reaction can be roughly divided into two stages: ES-I, ES-II, PM-I, and PM-2. The main mass loss interval for Si/PVDF composites was reported to be around 450~520 °C [18]. The Si/NiF 2 /PVDF composites also exhibit a significant mass loss in this temperature range, which leads to the inference that redox reactions of PVDF and Si NP mainly occur at ES-I and PM-I, which correspond to exothermic peaks on the DSC curves.…”

Section: Thermal Analysismentioning

confidence: 98%

Electrostatic spraying preparation of Si/NiF₂/PVDF energetic composites and their reaction characteristics

Mao

Cui

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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Metastable intermolecular composites are widely used in energy-demanding fields, where metal fluorides/fluoropolymers as oxidants have been a hot research topic in recent years. In this study, Si/NiF2/PVDF ternary energetic composites were prepared by the electrostatic spraying method for the first time, where NiF2 functions as the oxidant. At the same time, PVDF serves as both the oxidant and the binder. The energetic characteristics of the samples were studied through thermal analysis and preliminary ignition and combustion tests. It is found that the prepared samples are generally in the form of microspheres, in which PVDF binds Si and NiF2 particles together. The addition of Si nanopowder can promote the early decomposition of NiF2, which can improve reactivity. Compared with a physically mixed counterpart, the exothermic reaction between Si and PVDF in microspheres starts at lower temperatures and proceeds to more completion. The electrostatically sprayed sample also shows a shorter combustion time and a more intense luminescence phenomenon.

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“…Wang [ 67 ] also reported the superior hydrophobicity of GAP/NC/Al@PVDF core–shell nanofibers with a superior reactivity of ~10× higher burning speed compared to Al/PVDF uniaxial fibers; these core–shell fibers can also be excited by a semiconductor bridge in situ. Zhang [ 68 ] measured the corrosion resistance of Si/PVDF nanofibers to deionized water and NaOH solution. After 72 h of immersion, the retained content of Si was 100% and 73.3%, respectively, indicating superior storage stability.…”

Section: Energetic Fibers (1d Ems)mentioning

confidence: 99%

Progress in Electrohydrodynamic Atomization Preparation of Energetic Materials with Controlled Microstructures

Zhang

et al. 2022

Molecules

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Constructing ingenious microstructures, such as core–shell, laminate, microcapsule and porous microstructures, is an efficient strategy for tuning the combustion behaviors and thermal stability of energetic materials (EMs). Electrohydrodynamic atomization (EHDA), which includes electrospray and electrospinning, is a facile and versatile technique that can be used to process bulk materials into particles, fibers, films and three-dimensional (3D) structures with nanoscale feature sizes. However, the application of EHDA in preparing EMs is still in its initial development. This review summarizes the progress of research on EMs prepared by EHDA over the last decade. The morphology and internal structure of the produced materials can be easily altered by varying the operation and precursor parameters. The prepared EMs composed of zero-dimensional (0D) particles, one-dimensional (1D) fibers and two-dimensional (2D) films possess precise microstructures with large surface areas, uniformly dispersed components and narrow size distributions and show superior energy release rates and combustion performances. We also explore the reasons why the fabrication of 3D EM structures by EHDA is still lacking. Finally, we discuss development challenges that impede this field from moving out of the laboratory and into practical application.

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Electrospinning preparation, energetic characteristics and reaction mechanism of corrosion-resistant Si@PVDF nanostructured energetic films

Cited by 19 publications

References 36 publications

Recovery of Extracellular Polymeric Substances from Excess Sludge Using High-Flux Electrospun Nanofiber Membranes

Recovery of Extracellular Polymeric Substances from Excess Sludge Using High-Flux Electrospun Nanofiber Membranes

Electrostatic spraying preparation of Si/NiF₂/PVDF energetic composites and their reaction characteristics

Progress in Electrohydrodynamic Atomization Preparation of Energetic Materials with Controlled Microstructures

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Electrospinning preparation, energetic characteristics and reaction mechanism of corrosion-resistant Si@PVDF nanostructured energetic films

Cited by 19 publications

References 36 publications

Recovery of Extracellular Polymeric Substances from Excess Sludge Using High-Flux Electrospun Nanofiber Membranes

Recovery of Extracellular Polymeric Substances from Excess Sludge Using High-Flux Electrospun Nanofiber Membranes

Electrostatic spraying preparation of Si/NiF2/PVDF energetic composites and their reaction characteristics

Progress in Electrohydrodynamic Atomization Preparation of Energetic Materials with Controlled Microstructures

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Electrostatic spraying preparation of Si/NiF₂/PVDF energetic composites and their reaction characteristics