A postdoctoral position is available in the groups of Gil Nathanson and Tim Bertram to work on two projects:
1) Joint Nathanson/Bertram research on reactions of atmospheric gases with seawater microjets
2) Nathanson group research focusing on interfacial reactions of solvated electrons with surfactant-coated water microjets
The position is available immediately. See detailed information below.
We use gas-liquid scattering experiments to investigate the ways in which gas molecules react with common liquids and atmospheric aerosols. These liquids include jet fuel, sulfuric acid, liquid metals, glycerol, and aqueous solutions (using water microjets), each bare or coated with surfactants. The experiments enable us to explore the interfacial analogues of bulk solvation, hydrogen bonding, the “like dissolves like” rule, proton exchange and acid-base reactions, halogen atom transfer, and electron solvation and reaction. In our most important applications, we study reactions with sea spray mimics that regulate air quality and climate change, the evaporation of fuel in combustion engines, and reactions initiated by surface solvated electrons.
Much of our research focuses on surfactant control of reactions at gas-liquid interfaces. Representative pathways are illustrated in the figures for the production of Br2 from collisions of Cl2 with surfactant-coated glycerol containing Br- (left figure) and from collisions of N2O5 with surfactant-coated water containing Br- (right figure). These systems are used to model aerosol-mediated reactions for droplets containing water and organic molecules. These experiments demonstrate the remarkable power of cationic surfactants such as tetrahexylammonium (pictured in the left figure) to catalyze reactions of gaseous Cl2 and N2O5 with halide ions through their ability to drag the anion to the surface region, where it can react with an incoming gas molecule. Reactions of N2O5 with sea spray are particularly important because the hydrolysis and halogenation of this nighttime NOx reservoir influences the global concentrations of the ozone (a pollutant), hydroxyl radical (“chemical detergent of the atmosophere”, and methane ( a greenhouse gas).
POSTDOCTORAL POSITION INFORMATION
We are delighted to announce a postdoctoral opportunity in the labs of Gil Nathanson and Tim Bertram at the University of Wisconsin-Madison, a university and city that are wonderfully vibrant places to do science and to live. The research will focus on the dynamics of collisions and reactions using gas-microjet scattering experiments in two research fields:
1) interfacial reactions between atmospheric gases and sea spray mimics to explore aerosol-mediated chemistry (in Tim’s and Gil’s labs)
2) interfacial reactions between solvated electrons and liquid water solutions initiated by sodium atom ionization (in Gil’s lab)
The aqueous microjets in each project are composed of organic molecules, salts, and water to explore a diverse range of interfacial chemical reactions. These highly collaborative projects will involve interactions with researchers from around the world, including membership in the Center for Aerosol Impacts on Chemistry of the Environment, an NSF Phase II CCI. There will be abundant opportunities to brainstorm with experimental and theoretical chemists and to hone your scientific, mentoring, and professional skills.
To learn more about our earlier research, please follow the links to these publications:
solvated electron reactions at the vacuum-glycerol interface
atmospheric reactions of ambient gases with aerosol mimics
gas-liquid scattering review
Website links that describe our research are at:
The postdoctoral position is open immediately. We look forward to hearing from you,
Gil Nathanson and Tim Bertram