George Wandera Kisimbiri PhD student

PhD researcher interested in climate and air quality. My research focuses on the atmospheric chemistry of air pollutants from non-exhaust emissions, particularly gases derived from vehicle braking, and top-of-rail friction modifier products during wheel–rail contact. To investigate these emissions, I use experimental approaches, including the chemical characterization and quantification of volatile organic compounds released from brake wear and top-of-rail friction modifier products. Given the profound impacts of transport emissions on climate, air quality, and human health, my research aims to provide new insights into their environmental and atmospheric implications.

I utilise a pin-on-disc Tribometer to simulate the real-world braking process under a controlled laboratory setup. State-of-the-art online mass spectrometry tools like the high-resolution time-of-flight chemical ionization mass spectrometer (HR-ToF-CIMS) and a proton transfer reaction mass spectrometer (PTR-MS) chemically characterise emitted compounds at a molecular level

I have expertise in utilising synchrotron-based techniques (APXPS and NEXAFS) to study the surface chemistry of atmospheric relevant aerosol particles.

I am a member of the Swedish Institute Network for Global Professionals (SINFGL).