Research Interests

We are interested in understanding the surface chemistry of environmental interfaces and are using state-of-the-art techniques to unravel the complex chemistry that occurs at these interfaces. Several ongoing projects include (i) understanding the molecular level details of the heterogeneous chemistry of trace gases with particulate matter; (ii) applications and implications of nanoscience and nanotechnology in environmental processes. A brief summary of these projects is given below. For more details please visit the Grassian group website.

Heterogeneous atmospheric chemistry: It has become increasingly clear that all kinds of particles - including ice, sea salt and mineral dust - are present in the Earth's atmosphere and that the surfaces of these particles play a role in the chemistry of the atmosphere. The ozone hole is one example of how heterogeneous chemistry involving chlorine-reservoir species on ice particles can decrease ozone levels in the stratosphere. In the troposphere, the region closest to the Earth's surface, there are many more particles and the heterogeneous chemistry of these particles with trace gases such as NO₂, HNO₃, SO₂, O₃ and organics is not well understood. In the Grassian research group, we are using a combination of surface spectroscopy, microscopy and particle analysis to gain a molecular level understanding of these important surface reactions. Reaction rate data measured in our laboratory for heterogeneous reactions of trace gases with mineral dust (CaCO₃, α-Fe₂O₃, aluminum silicates.) are currently being incorporated into global chemistry models. We are also trying to understand how the surface chemistry of atmospheric particles can impact other global processes including climate, biogeochemical cycles and human health.

Applications and Implications of Nanoscience and Nanotechnology in Environmental Processes: Nanoscience and nanotechnology have potential use in environmental applications. In collaboration with Sarah Larsen, we are investigating nanocrystalline zeolite materials as new adsorbents and catalysts for use in environmental remediation, environmentally benign synthesis and the decontamination of chemical warfare agents.

Another aspect of our work is in the implications of nanoscience and nanotechnology and the environmental consequences of nanomaterials. We are collaborating with colleagues in Public Health to better understand the potential health effects of manufactured nanomaterials should they become suspended in air.