Fabrication of Co/Al2O3 Composite Nanofiber via Electrospinning with Tunable Magnetic Properties

Zhang, Zidong; Zhang, Wenjin; Chen, Min; Jiang, Yuansheng; Tian, Rui; Zhang, Jian; Fan, Runhua

doi:10.1007/s12221-020-1409-0

Cited by 6 publications

(3 citation statements)

References 80 publications

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“…In all these cases, the distribution of the magnetic nanoparticles and their amount are highly relevant. In many cases, homogeneously distributed nanoparticles are favored [ 31 , 32 , 33 ]. The nanoparticle distribution is especially relevant, since it defines the magnetic properties of the nanofiber mats.…”

Section: Introductionmentioning

confidence: 99%

Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques

et al. 2022

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Electrospinning can be used to produce nanofiber mats containing diverse nanoparticles for various purposes. Magnetic nanoparticles, such as magnetite (Fe3O4), can be introduced to produce magnetic nanofiber mats, e.g., for hyperthermia applications, but also for basic research of diluted magnetic systems. As the number of nanoparticles increases, however, the morphology and the mechanical properties of the nanofiber mats decrease, so that freestanding composite nanofiber mats with a high content of nanoparticles are hard to produce. Here we report on poly (acrylonitrile) (PAN) composite nanofiber mats, electrospun by a needle-based system, containing 50 wt% magnetite nanoparticles overall or in the shell of core–shell fibers, collected on a flat or a rotating collector. While the first nanofiber mats show an irregular morphology, the latter are quite regular and contain straight fibers without many beads or agglomerations. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) reveal agglomerations around the pure composite nanofibers and even, round core–shell fibers, the latter showing slightly increased fiber diameters. Energy dispersive X-ray spectroscopy (EDS) shows a regular distribution of the embedded magnetic nanoparticles. Dynamic mechanical analysis (DMA) reveals that mechanical properties are reduced as compared to nanofiber mats with smaller amounts of magnetic nanoparticles, but mats with 50 wt% magnetite are still freestanding.

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Section: Introductionmentioning

confidence: 99%

Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques

et al. 2022

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“…In this study, a tri-layer composite consisting of negative-ε´ and positive-ε´ layers is explored. For a positive-ε´ layer, there are many candidates for composites with various llers (dielectrics and ceramics) [18,19]. However, for a negative-ε layer, positive-ε layers are di cult to match because of larger absolute values of negative permittivity.…”

Section: Introductionmentioning

confidence: 99%

Boosted energy storage density of sandwich-structurecomposites: A unique strategy via introducing negative permittivity layer

Song

Zhang

Fan

et al. 2023

Preprint

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Dielectric materials exhibiting high power densities have garnered significant interest as crucial constituents for capacitors employed in energy storage systems and diverse electronic devices. Regrettably, the intrinsic low energy densities of dielectrics pose significant limitations to their practical application. Hence, the pursuit of enhanced energy storage properties and superior dielectric performance in dielectric materials necessitates the exploration of novel approaches to material design and processing. Here, a special design that introduces a negative-ε´ layer in a sandwich structure is explored for simultaneously realising high breakdown strength and permittivity, which are two critical factors influencing energy density. In a tri-layer composite, the outer positive-ε´ layer consisting of BN/PVDF offers high breakdown strength due to the presence of abundant BN sheets and micro-interfaces in the composite can effectively block the electric trees expansion. Simultaneously, the negative-ε´ layer of MWCNTs/PVDF provides elevated permittivity and enhanced energy density due to the synergistic effect between the positive and negative-ε´ layers, along with interfacial polarizations in the micro-interfaces connecting adjacent layers. As a result, the tri-layer composite, with a thickness ratio of 1:20:1, achieves an extraordinary permittivity of 432. Importantly, a high discharge energy density of approximately 27 J/cm3 is obtained by carefully balancing the dielectric properties of single layers. This investigation presents a novel insight on the design of high-energy-density dielectric materials through introducing a negative ε´ layer, offering significant benefits for energy storage applications.

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“…For example, Ca, Si, Co, Ba, Er, Yb, Y, La, Mg, and Ce have been adopted in ZrO 2 nanofibers to construct stable binary nanofibers at high temperatures. [9][10][11][12][13][14][15][16][17] Numerous oxide ceramic nanofibers have been fabricated by electrospinning, but fabrication of inorganic nanofibers for use in harsh environments is very challenging.…”

Section: Introductionmentioning

confidence: 99%

Flexible Al₂O₃/ZrO₂ nanofibrous membranes for thermal insulation

Zhang

et al. 2022

CrystEngComm

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Fabrication of Co/Al2O3 Composite Nanofiber via Electrospinning with Tunable Magnetic Properties

Cited by 6 publications

References 80 publications

Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques

Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques

Boosted energy storage density of sandwich-structurecomposites: A unique strategy via introducing negative permittivity layer

Flexible Al₂O₃/ZrO₂ nanofibrous membranes for thermal insulation

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Fabrication of Co/Al2O3 Composite Nanofiber via Electrospinning with Tunable Magnetic Properties

Cited by 6 publications

References 80 publications

Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques

Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques

Boosted energy storage density of sandwich-structurecomposites: A unique strategy via introducing negative permittivity layer

Flexible Al2O3/ZrO2 nanofibrous membranes for thermal insulation

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Product

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Flexible Al₂O₃/ZrO₂ nanofibrous membranes for thermal insulation