<br/>Surfaces play a major role in the indoor environment, influencing the lifetimes and reactivity of indoor emissions. The physiochemical interactions between surfaces and deposited material impacts the lifetime of these compounds, potentially persisting on surfaces for months or years. Past studies have focused on characterizing the chemical composition and quantifying the amount of material deposited on indoor-relevant surfaces in both field and laboratory generated indoor environments. However, there have been a lack of studies directly probing the morphology and physical state these thin films or particle deposits. Furthermore, the underlying chemical and physical interactions involving these surface adsorbed compounds have not been thoroughly examined. Window glass, a ubiquitous indoor surface, was placed vertically in both in the field to single event indoor activities throughout the House Observations of Microbial and Environmental Chemistry(HOMEChem) campaign, and in the laboratory using a small Teflon environmental chamber to evaluate deposition both physically and spectroscopically. Atomic force microscopy-infrared(AFM-IR) spectromicroscopic analyses reveal that the deposition of submicron particulate matter is a significant contributor to modifying the chemical and physical state of glass surfaces due to cooking and cleaning events. Spectroscopic analyses of these particles reveal signatures of carboxylates bound to surfaces, suggesting the importance of chemisorption of these organic rich particles onto the glass surface. Reproducing these findings in the Teflon environmental chamber establishes the connection between the physical state of these surfaces and the chemical composition of the molecules binding to these surfaces.  Thus integration of laboratory studies under more controlled conditions and field studies such as HOMEChem is crucial for understanding the implications of surfaces in indoor air quality.<br/> <br/>

Nanoscale morphology and spectroscopic analyses of glass surfaces in indoor environments

2019 Fall National Meeting

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