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Related Concept Videos

Passive Filters01:27

Passive Filters

1.0K
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Air-entraining Agents01:27

Air-entraining Agents

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Air-entraining agents improve the durability and workability of concrete in climates with frequent freezing and thawing. These agents prevent cracks by introducing small air bubbles into the mix, creating spaces accommodating water expansion when temperatures drop. The air-entraining agents lower the surface tension of water, forming stable, small air bubbles. This method is more effective than having accidental large voids, as the intentional, smaller, and evenly distributed air voids improve...
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Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

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Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
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Measurement of Air Content in Concrete01:23

Measurement of Air Content in Concrete

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Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...
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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Air-sampled Filter Analysis for Endotoxins and DNA Content
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Triboelectric filtering for air purification.

Jianqing Liu1, Tao Jiang2, Xiaohui Li1

  • 1Beijing NairTENG Technology Co. Ltd, Beijing, 100085, People's Republic of China.

Nanotechnology
|March 9, 2019
PubMed
Summary
This summary is machine-generated.

Triboelectric nanotechnology offers an effective solution for air pollution by efficiently removing particulate matters (PMs). This review explores its mechanisms, applications, and advantages over traditional air filters.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Nanotechnology

Background:

  • Air pollution, particularly haze from particulate matters (PMs), is a growing global concern.
  • Effective air filtration technologies are crucial for mitigating environmental and health impacts.
  • Traditional methods like fibrous filtering and electrostatic precipitation have limitations.

Purpose of the Study:

  • To review recent advancements in air filtration using triboelectric nanotechnology.
  • To provide a comprehensive overview of triboelectric air filtering technologies.
  • To highlight the potential of triboelectric nanotechnology in addressing air pollution.

Main Methods:

  • Review of literature on triboelectric materials and nanotechnology.
  • Analysis of the coupling mechanism of triboelectric and mechanical filtering.
  • Categorization of air filtering approaches: TENG-driven, TENG-enhanced nanofiber, and self-powered systems.

Main Results:

  • Triboelectric nanotechnology demonstrates efficient air filtering capabilities with advantages over conventional methods.
  • The mechanism involves a synergistic combination of triboelectric and mechanical filtration principles.
  • Various approaches, including TENG-driven and self-powered systems, show promising filtering performance.

Conclusions:

  • Triboelectric nanotechnology presents a novel and effective strategy for air purification.
  • The technology offers significant potential for developing advanced air filters.
  • Industry products based on triboelectric filtering are emerging, indicating practical applicability.