Electret effect and electrotransport in disperse organic and inorganic systems

Shcherbachenko, L. A.; Borisov, Vladislav; Maksimova, N. T.; Baryshnikov, E. S.; Karnakov, V. A.; Ezhova, Ya. V.; Ruzhnikov, L. I.

doi:10.1134/s1063784209090199

Cited by 14 publications

(5 citation statements)

References 3 publications

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“…The intrinsically different electronic transport capabilities between HABE and PLA resulted in a charge barrier, and the formation of interfacial charges increased the number of deep charge traps. 57,58 Meanwhile, the movement of few volume charges from shallow to deep traps would also contribute to the amorphous−crystalline interfacial charge traps because electrons under an E-field are endowed with enough energy to be activated (Figure 3i). 59,60 The schematic diagram and photo for the filtration performance measurement setup are depicted in Figure 4a and Figure S7.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…An increased interphase of HABE–PLA and amorphous–crystalline PLA enhanced the polarization of HABE-modified PLA during solidification (Figure h). The intrinsically different electronic transport capabilities between HABE and PLA resulted in a charge barrier, and the formation of interfacial charges increased the number of deep charge traps. , Meanwhile, the movement of few volume charges from shallow to deep traps would also contribute to the amorphous–crystalline interfacial charge traps because electrons under an E-field are endowed with enough energy to be activated (Figure i). , …”

Section: Results and Discussionmentioning

confidence: 99%

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Bioelectrets in Electrospun Bimodal Poly(lactic acid) Fibers: Realization of Multiple Mechanisms for Efficient and Long-Term Filtration of Fine PMs

Tang

Jiang

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Despite the great potential in fabrication of biodegradable and eco-friendly air filters by electrospinning poly(lactic acid) (PLA) membranes, the filtering performance is frequently dwarfed by inadequate physical sieving or electrostatic adsorption mechanisms to capture airborne particulate matters (PMs). Here, using the parallel spinning approach, the unique micro/nanoscale architecture was established by conjugation of neighboring PLA nanofibers, creating bimodal fibers in electrospun PLA membranes for the enhanced slip effect to significantly reduce the air resistance. Moreover, the bone-like nanocrystalline hydroxyapatite bioelectret (HABE) was exploited to enhance the dielectric and polarization properties of electrospun PLA, accompanied by the controlled generation of junctions induced by the microaggregation of HABE (10–30 wt %). The incorporated HABE was supposed to orderly align in the applied E-field and largely promote the charging capability and surface potential, gradually increasing to 7.2 kV from the lowest level of 2.5 kV for pure PLA. This was mainly attributed to HABE-induced orientation of PLA backbone chains and CO dipoles, as well as the interfacial charges trapped at the interphases of HABE–PLA and crystalline region–amorphous PLA. Given the multiple capturing mechanisms, the micro/nanostructured PLA/HABE membranes were characterized by excellent and sustainable filtering performance, e.g., the filtration efficiency of PM0.3 was promoted from 59.38% for pure PLA to 94.38% after addition of 30 wt % HABE at a moderate airflow capacity of 32 L/min and from 30.78 to 83.75% at the highest level of 85 L/min. It is of interest that the pressure drop was significantly decreased, mainly arising from the slip effect between the ultrafine nanofibers and conjugated microfibers. The proposed combination of the nanostructured electret and the multistructuring strategy offers the function integration of efficient filtration and low resistance that are highly useful to pursue fully biodegradable filters.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Bioelectrets in Electrospun Bimodal Poly(lactic acid) Fibers: Realization of Multiple Mechanisms for Efficient and Long-Term Filtration of Fine PMs

Tang

Jiang

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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“…The intrinsically different electronic transport capabilities between PVDF and HAP resulted in a charge barrier, which is hard to overcome. As a result, charges tend to accumulate at the interfacial zones instead of being transferred from one to another, leading to the formation of interfacial charges [36] , [37] . It is worth noting that we propose that the classical Maxwell-Wagner effect can serve as an essential electret mechanism for ESNs, which might be identified as a progress since it has been employed to analyze the interfacial charges of buck bi-layer materials conventionally.…”

Section: Resultsmentioning

confidence: 99%

Ultrafine, self-crimp, and electret nano-wool for low-resistance and high-efficiency protective filter media against PM0.3

Cao

Yin

et al. 2020

Journal of Colloid and Interface Science

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“…This is because the addition of TiO 2 NPs increased the area between the crystalline and amorphous regions and introduced polar groups. The Maxwell-Wagner effect is caused by the interface between PVDF and TiO 2 NPs [37,38]. The charges in PVDF and TiO 2 NPs will move in the same direction under the action of an external electric field.…”

Section: 𝑃 = 𝑉 − 𝑉 𝑉mentioning

confidence: 99%

Electrospun 3D Curly Electret Nanofiber Air Filters for Particulate Pollutants

Zhao,

Tulugan,

Zhang

et al. 2024

Sustainability

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Amidst rapid industrialization and urbanization, air pollution has emerged as a global environmental challenge. Traditional air filtration materials face challenges in effectively filtering PM0.3 and often result in discomfort due to high air resistance when used for personal protection, as well as excessive energy consumption in industrial air purification applications. This study initially utilized extremely high environmental humidity to induce fiber formation, resulting in the preparation of a fluffy fiber membrane with a three-dimensional curly morphology, which increased the porosity to 96.93%, significantly reducing air resistance during filtration. Subsequently, rutile TiO2 with a high dielectric constant was introduced, exploiting the low pressure drop characteristic of the fluffy 3D curly fiber membrane combined with the electret effect of TiO2 nanoparticles to notably improve the issue of excessive pressure drops while maintaining filtration efficiency. The microstructure, morphology, and element distribution of the fibers were analyzed using FESEM and EDS. FTIR and XRD were employed to examine the functional groups and crystal structure within the fibers. The electret effect and filtration performance of the fiber membrane were investigated using an electrostatic tester and a particulate filtration efficiency tester. The results demonstrated that inducing fiber formation under high-humidity conditions could produce fibers with a 3D curly structure. The fiber membrane was highly fluffy, significantly reducing the pressure drop. Introducing an appropriate amount of titanium dioxide markedly improved the electrostatic effect of the fiber membrane, enhancing the filtration performance of the 3D curly PVDF/TiO2 composite fiber membrane. With a 0.5% addition of TiO2 nanoparticles, the filtration efficiency of the fiber membrane reached approximately 99.197%, with a pressure drop of about 49.83 Pa. This study offers a new approach to developing efficient, low-resistance air filtration materials, showcasing the potential of material innovation in addressing air quality challenges within the sustainable development framework.

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Electret effect and electrotransport in disperse organic and inorganic systems

Cited by 14 publications

References 3 publications

Bioelectrets in Electrospun Bimodal Poly(lactic acid) Fibers: Realization of Multiple Mechanisms for Efficient and Long-Term Filtration of Fine PMs

Bioelectrets in Electrospun Bimodal Poly(lactic acid) Fibers: Realization of Multiple Mechanisms for Efficient and Long-Term Filtration of Fine PMs

Ultrafine, self-crimp, and electret nano-wool for low-resistance and high-efficiency protective filter media against PM0.3

Electrospun 3D Curly Electret Nanofiber Air Filters for Particulate Pollutants

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