Whole-body nanoparticle aerosol inhalation exposures

Area of Science:

• Nanotechnology
• Toxicology
• Materials Science

Background:

• Inhalation is a primary exposure route for engineered nano-materials (ENM).
• Generating stable, homogenous nanoparticle aerosols for inhalation studies is challenging due to agglomeration.
• Existing aerosol generators fail to meet critical criteria for nanoparticle aerosol studies.

Purpose of the Study:

• To develop and validate a whole-body nanoparticle aerosol inhalation exposure system.
• To generate nano-titanium dioxide (TiO2) aerosols meeting specific concentration, homogeneity, and size distribution criteria.
• To enable reliable simulation of occupational, environmental, and domestic ENM aerosol exposures.

Main Methods:

• Fabrication of a novel nano-TiO2 aerosol generator and a 0.5 m³ whole-body inhalation exposure chamber.
• Continuous monitoring and control of chamber conditions (pressure, temperature, RH, O2, CO2).
• Measurement of particle size distribution (SMPS, ELPI) and mass concentration (gravimetric analysis, EDX).

Main Results:

• The system successfully generated nano-TiO2 aerosols with steady mass concentration and homogenous composition.
• Achieved stable particle size distributions with a count-median aerodynamic diameter of 157 nm.
• Validated system reliably and repeatedly created test atmospheres simulating ENM exposures.

Conclusions:

• The developed whole-body nanoparticle aerosol inhalation exposure system effectively addresses challenges in generating controlled nanoparticle aerosols.
• The system provides a reliable method for creating test atmospheres crucial for accurate nanoparticle inhalation toxicology studies.
• This technology supports the assessment of health risks associated with occupational and environmental exposure to engineered nano-materials.