The Grassian group is involved in several research areas including surface chemistry of environmental interfaces, heterogeneous atmospheric chemistry, climate impact of atmospheric aerosols, and environmental and health aspects of nanoscience and nanotechnology.
The research tools that we use and the approach that we take in these studies are quite varied. In some cases, we make use of the pristine environment of an ultrahigh vacuum chamber to have complete control of surface composition. In other cases, high surface area nanoparticle powder samples are used with gas phase atmospheric pressures or liquid phase environments used. The different pressure regimes and techniques used to probe the chemistry of environmental interfaces depend upon the exact hypotheses we are testing and the environmental questions that we are trying to address. Below lists some of the research tools and techniques that we use to probe the chemistry of environmental interfaces including those of atmospheric particles (e.g. mineral dust, sea salt and soot) as well as nanoparticles (e.g. alpha-FeOOH nanorods or TiO2 nanoparticles). A brief description of each these tools is provided.
- Single Particle Inductively Coupled Plasma - Mass Spectrometry (spICP-MS)
- Aerosol Optical Tweezers
- Quartz Crystal Microbalance-Dissipation
- Micro-Raman spectroscopy
- ATR-FTIR spectroscopy with gas-phase flow cell reactor
- Multi-analysis aerosol reactor system (MAARS) with FTIR, SMPS, APS and CCN capabilities
- Aerosol scattering apparatus
- Environmental aerosol chamber
- ATR-FTIR spectroscopy with liquid cell
- Light scattering measurements of particles in solution
- Transmission FTIR spectroscopy
- Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS)
- Quantitative adsorption and solution phase photocatalytic reactions with HPLC