Nsf Graduate Research Fellow
Madison, Wisconsin
Researching collisions at the air-liquid interface using mass spectroscopy and molecular beam scattering under Gilbert Nathanson. Our research has illuminated the impact of salts and organic surfactants on reactions of N2O5 at the surface of aerosol particles. At night, N¬2O5 serves as a reservoir for nitric oxides produced when fossil fuels are burned. Uptake and reaction of N2O5 in aerosol droplets has a profound effect on the concentrations of ozone, hydroxyl, and methane in our atmosphere,… Show more Researching collisions at the air-liquid interface using mass spectroscopy and molecular beam scattering under Gilbert Nathanson. Our research has illuminated the impact of salts and organic surfactants on reactions of N2O5 at the surface of aerosol particles. At night, N¬2O5 serves as a reservoir for nitric oxides produced when fossil fuels are burned. Uptake and reaction of N2O5 in aerosol droplets has a profound effect on the concentrations of ozone, hydroxyl, and methane in our atmosphere, but the interfacial reactivity of N2O5¬ is poorly understood because it depends upon the ions and organics present in aerosols. We interrogate the reactivity of N2O5 at the gas-liquid interface in vacuum by directing a beam of N2O5 molecules at the surface of a water microjet containing LiBr and either alkylammonium or alcohol surfactants. Br- ions in the interfacial region attack N2O5 to produce Br2 which we observe desorbing from solution using mass spectroscopy. Our results expose a dramatic capturing of Br2 by the solution when surfactant molecules are present. Previously, I utilized the microjet to investigate interactions of acids, bases, and organic molecules with different functional groups (such as HCl, carboxylic acids, amines, alcohols, esters, and ethers) with water surfaces. These studies illustrate the influential effect that cations in solution hold on the near-interfacial solubility of amines and demonstrate the powerful ability of surface water molecules to trap and solvate impinging acids and bases. Show less