Nanofiber Air Filters with High-Temperature Stability for Efficient PM<sub>2.5</sub> Removal from the Pollution Sources

Wei, Fei; Liu, Chong; Hsu, Po‐Chun; Zhang, Chaofan; Liu, Nian; Zhang, Jinsong; Lee, Hye Ryoung; Lü, Yingying; Qiu, Yongcai; Chu, Shirley S.; Cui, Yi

doi:10.1021/acs.nanolett.6b00771

Cited by 481 publications

(339 citation statements)

References 37 publications

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“…These results are comparable to published studies about vehicle cabin air inlet filters [29], somehow coinciding with the HEPA standards [15,26]. The design of automotive filters is based on their ability to filter particles, which is dependent on the mesh and the structure and composition of the fiber [30]. The analysis of CAFs showed spaces much larger than the fiber diameters, allowing substantial air flow, whereas fibers have a higher specific surface area.…”

Section: Discussionsupporting

confidence: 86%

Characterization of Airborne Particles Collected from Car Engine Air Filters Using SEM and EDX Techniques

Rivera

Rodriguez

2016

IJERPH

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Particulate matter accumulated on car engine air-filters (CAFs) was examined in order to investigate the potential use of these devices as efficient samplers for collecting street level air that people are exposed to. The morphology, microstructure, and chemical composition of a variety of particles were studied using scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX). The particulate matter accumulated by the CAFs was studied in two categories; the first was of removed particles by friction, and the second consisted of particles retained on the filters. Larger particles with a diameter of 74–10 µm were observed in the first category. In the second one, the detected particles had a diameter between 16 and 0.7 µm. These particles exhibited different morphologies and composition, indicating mostly a soil origin. The elemental composition revealed the presence of three groups: mineral (clay and asphalt), metallic (mainly Fe), and biological particles (vegetal and animal debris). The palynological analysis showed the presence of pollen grains associated with urban plants. These results suggest that CAFs capture a mixture of atmospheric particles, which can be analyzed in order to monitor urban air. Thus, the continuous availability of large numbers of filters and the retroactivity associated to the car routes suggest that these CAFs are very useful for studying the high traffic zones within a city.

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Section: Discussionsupporting

confidence: 86%

Characterization of Airborne Particles Collected from Car Engine Air Filters Using SEM and EDX Techniques

Rivera

Rodriguez

2016

IJERPH

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“…After cleaning, only fewer particles were found, suggesting that the sample CB3 could be reused due to its robustness (Figure E). Furthermore, comparison between CB3 and various porous materials in previous studies is shown in Table . It is demonstrated that as‐prepared CB3 exhibits a relatively high removal efficiency at an ultra‐low pressure drop, and undergoes a much higher testing temperature compared with other materials.…”

Section: Resultsmentioning

confidence: 96%

Novel design of alumina foams with three‐dimensional reticular architecture for effective high‐temperature particulate matter capture

et al. 2019

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Ceramic foams with extensive interconnected pores have great application potential in high‐temperature particulate matter (PM) capture. Considering that there are still challenges to synthesize ceramic foams with efficient filtration, a novel hierarchical‐structured alumina foam with three‐dimensional (3D) reticular architecture has been fabricated via combining chemical grafting pore‐forming agent and polyurethane (PU) foaming technology. Carbon black is grafted with carbamate functional groups in order to enable a better dispersion in highly viscous PU. Submicrometer and micrometer‐sized pores on the cell walls are observed in hierarchical‐structured ceramic foams. The resulting alumina foam exhibits 95.2% removal efficiency for PM particles and low pressure drop of only 50 Pa when grafted carbon black content is 3 wt%. This filtration performance is much higher than that of existing ceramic materials. These features, combined with our experimental design strategy, provide a new insight to design high‐temperature PM filtration materials with durable high performance.

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“…The PM was generated by burning incense and contained particles of sizes from <0.3 µm to >10 µm. 26,27 The PM 2.5 concentration data in the chamber was obtained using an air-quality monitor (BR-SMART 126, Bramc). Temperature data was measured using a digital thermometer (Testo 174T, TESTO).…”

Section: Resultsmentioning

confidence: 99%

Observation of convection phenomenon by high-performance transparent heater based on Pt-decorated Ni micromesh

Kim

et al. 2017

AIP Advances

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In this study, we report for the first time on the convection phenomenon for the consistent and sensitive detection of target materials (particulate matter (PM) or gases) with a high-performance transparent heater. The high-performance transparent heater, based on Pt-decorated Ni micromesh, was fabricated by a combination of transfer printing process and Pt sputtering. The resulting transparent heater exhibited excellent mechanical durability, adhesion with substrates, flexibility, and heat-generating performance. We monitored the changes in the PM concentration and temperature in an airtight chamber while operating the heater. The temperature in the chamber was increased slightly, and the PM2.5 concentration was increased by approximately 50 times relative to the initial state which PM is deposed in the chamber. We anticipate that our experimental findings will aid in the development and application of heaters for sensors and actuators as well as transparent electrodes and heating devices.

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Nanofiber Air Filters with High-Temperature Stability for Efficient PM_2.5 Removal from the Pollution Sources

Cited by 481 publications

References 37 publications

Characterization of Airborne Particles Collected from Car Engine Air Filters Using SEM and EDX Techniques

Characterization of Airborne Particles Collected from Car Engine Air Filters Using SEM and EDX Techniques

Novel design of alumina foams with three‐dimensional reticular architecture for effective high‐temperature particulate matter capture

Observation of convection phenomenon by high-performance transparent heater based on Pt-decorated Ni micromesh

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Nanofiber Air Filters with High-Temperature Stability for Efficient PM2.5 Removal from the Pollution Sources

Cited by 481 publications

References 37 publications

Characterization of Airborne Particles Collected from Car Engine Air Filters Using SEM and EDX Techniques

Characterization of Airborne Particles Collected from Car Engine Air Filters Using SEM and EDX Techniques

Novel design of alumina foams with three‐dimensional reticular architecture for effective high‐temperature particulate matter capture

Observation of convection phenomenon by high-performance transparent heater based on Pt-decorated Ni micromesh

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Product

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Nanofiber Air Filters with High-Temperature Stability for Efficient PM_2.5 Removal from the Pollution Sources