Needle-Trap Device Containing a Filter: A Novel Device for Aerosol Studies.

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Characterizing gaseous samples requires trapping particles, as they contain essential analytes.
• Conventional needle-trap devices (NTDs) have limitations in trapping efficiency, particularly for nanoparticles.
• Developing advanced materials is crucial for enhancing particle capture in analytical sampling.

Purpose of the Study:

• To develop and evaluate a polyacrylonitrile (PAN) aerogel filter for improved particle trapping in NTDs.
• To assess the trapping efficiency and mechanical stability of the novel aerogel filter.
• To compare the performance of the developed NTD with thin-film microextraction for breath sample analysis.

Main Methods:

• Fabrication of a PAN aerogel filter via electrospinning and freeze-drying.
• Thermal treatment (H-PAN) of the aerogel for enhanced stability.
• Testing trapping efficiency across various conditions and mechanical stability through repeated cycles.
• Comparative analysis with thin-film microextraction using breath samples.

Main Results:

• The H-PAN-packed NTD demonstrated high filtration efficiencies (>99%) for particles under all tested conditions.
• The aerogel filter exhibited excellent mechanical stability and repeatability over multiple extraction/desorption cycles (RSD <6%).
• The developed NTD successfully trapped both free and droplet-bound analytes in breath samples, unlike thin-film microextraction.

Conclusions:

• The PAN aerogel-based NTD offers a significant advancement for comprehensive gaseous sample analysis by efficiently trapping small particles.
• This technology provides a more complete characterization of analytes compared to methods limited to free analytes.
• The developed NTD shows promise for applications requiring sensitive and thorough analysis of airborne particles and associated compounds.