Glass surface evolution following gas adsorption and particle deposition from indoor cooking events as probed by microspectroscopic analysis

Abstract

Microspectroscopic analyses of glass surfaces following a single day of cooking events reveal organic depositions that can be traced back to emission sources and airborne distributions.

Emerging investigator series: chemical and physical properties of organic mixtures on indoor surfaces during HOMEChem

“…Analysis of the physical properties of this manually removed material is ongoing; the description provided here comes from the observed behaviour when a sample was pressed down onto an Attenuated Total Reectance-Fourier Transform Infrared spectroscopy crystal for Or et al (2020). 2 The total area that was scraped with the razor blade was approximately the same as the solvent extraction.…”

“…Flatter particles with a low aspect ratio were observed suggesting that the freshly deposited particles on this surface have a low viscosity. 2 For the modelled viscosity, eqn (1) estimates the model parameter, T g , based only on chemical composition and was derived from a dataset mostly with saturated compounds comprising OH and COOH functional groups. 55,57 While this method has been successful in predicting viscosity of atmospheric SOA, 30,31 it could signicantly overestimate the T g of compounds containing carbonyl and ester groups.…”

“…Organic lms on indoor surfaces can be formed through the deposition of semi-volatile organic compounds (SVOC) and aerosol particles. [1][2][3][4][5] Due to the high surface area to volume ratio indoors, [6][7][8] these lms play important roles in the chemistry of indoor environments as a medium for chemical reactions 9 and as a location for partitioning of gas-phase molecules including SVOCs as well as ammonium and HONO. [10][11][12][13][14][15][16] Previous studies evaluating the chemical components of these lms focused on measuring SVOCs.…”

Quantifying proximity, confinement, and interventions in disease outbreaks: a decision support framework for air-transported pathogens

“…In comparison, removal of 1-μm particles is dominated by air exchange and easily altered by ventilation. A good understanding of indoor deposition rates therefore underlies quantification of ventilation effectiveness, but these loss rates are infrequently measured, and measured deposition is usually faster than theoretical predictions (30).…”

“…Impaction and other mechanisms should stop many 10-µm particles, but they can escape by leaking around the material of an unsealed mask. Oberg and Brosseau (30) reported surgical mask penetration of less 1% to 67% for 3.1-μm particles, with most of the penetration values below than 1%. For 10-μm particles, we used penetration values of 1–30% to account for cloth masks and poor fits.…”