Work

Validation of cantilever-enhanced photoacoustic particle-size-resolved light absorption measurement using nigrosin reference particles and Mie modelling

Year: 2025

Type: article

Abstract: . Particle light absorption enhancement, also known as the lensing effect, is a complex phenomenon where particles undergo optical transformation as they age. This process is influenced by several factors, including particle size. To investigate the lensing effect, this study introduces a novel method and technique for measuring size-resolved light absorption of particles. The key instrument in this method is a 3-wavelength Cantilever-Enhanced Photoacoustic Spectrometer, which is a fast and sensitive tool that measures absorption directly in the aerosol phase. By coupling the CEPAS with a conventional Differential Mobility Analyzer, particle-size resolved measurements are achieved. Evaluation of the developed system showed a strong correlation (R2 > 0.97) with Mie-modelled light absorption of nigrosin reference particles, paving the way for intriguing new opportunities in future studies.

Source: Aerosol Research

DOI: 10.5194/ar-3-1-2025