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Yusuf Hamied Department of Chemistry


Leverhulme Trust Early Career Fellow

Research Interests

My research broadly relates to the reactivity of volcanic ash from explosive eruptions in the Earth system. Specifically, this work utilises a range of experimental and analytical techniques to investigate the properties and processes that govern:

  • The capacity of ash surfaces to take up and react with trace gases such as sulphur dioxide and ozone in the eruption plume and the atmosphere
  • The activity of ash particles in promoting ice nucleation in the eruption plume and the atmosphere
  • The role of ash emissions as a source of soluble, and potentially bioavailable, iron for the surface ocean

Previous Positions

  • Marie Skłodowska-Curie Research Fellow (2018-2020) School of Earth and Environment, University of Leeds, United Kingdom
  • Postdoctoral Researcher (2017) Laboratory of Physics and Chemistry of the Atmosphere, Université du Littoral Côte d'Opale, France


  • PhD Geochemistry (2016) Earth and Life Institute, Université catholique de Louvain, Belgium
  • MSc Environmental Science and Management (2012) University of York, United Kingdom
  • BSc Biological Sciences (2010) University of Calgary, Canada


Journal Articles

Volcanic ash ice-nucleating activity can be enhanced or depressed by ash-gas interaction in the eruption plume (2020) Maters EC, Cimarelli C, Casas AS, Dingwell DB, Murray BJ. Earth and Planetary Science Letters. 551, 116587, doi:10.1016/j.epsl.2020.116587

Iceland is an episodic source of atmospheric ice-nucleating particles relevant for mixed-phase clouds (2020) Sanchez-Marroquin A, Arnalds O, Baustian-Dorsi KJ, Browse J, Dagsson-Waldhauserova P, Harrison AD, Maters EC, Pringle KJ, Vergara-Temprado J, Burke IT, McQuaid JB, Carslaw KS, Murray BJ. Science Advances. 6(26), eaba8137, doi:10.1126/sciadv.aba8137

The importance of crystalline phases in ice nucleation by volcanic ash (2019) Maters EC, Dingwell DB, Cimarelli C, Müller D, Whale TF, Murray BJ. Atmospheric Chemistry and Physics. 19(8), 5451-5465, doi:10.5194/acp-19-5451-2019

Reactive uptake of sulfur dioxide and ozone on volcanic glass and ash at ambient temperature (2017) Maters EC, Delmelle P, Rossi MJ, Ayris PM. Journal of Geophysical Research: Atmospheres. 122(18), 10,077-10,088, doi:10.1002/2017JD026993

Controls on iron mobilisation from volcanic ash at low pH: Insights from dissolution experiments and Mössbauer spectroscopy (2017) Maters EC, Delmelle P, Gunnlaugsson HP. Chemical Geology. 449, 73-81, doi:10.1016/j.chemgeo.2016.11.036

Controls on the surface chemical reactivity of volcanic ash investigated with probe gases (2016) Maters EC, Delmelle P, Rossi MJ, Ayris PM, Bernard A. Earth and Planetary Science Letters. 450, 254-262, doi:10.1016/j.epsl.2016.06.044

Smectites and zeolites in ash from the 2010 summit eruption of Eyjafjallajökull volcano, Iceland (2016) Paque M, Detienne M, Maters EC, Delmelle P. Bulletin of Volcanology. 78(9), doi:10.1007/s00445-016-1056-x

Atmospheric processing of volcanic glass: Effects on iron solubility and redox speciation (2016) Maters EC, Delmelle P, Bonneville S. 2016. Environmental Science & Technology. 50(10), 5033-5040, doi:10.1021/acs.est.5b06281

Spatial analysis of Mount St. Helens tephra leachate compositions: Implications for future sampling strategies (2015) Ayris PM, Delmelle P, Pereira B, Maters EC, Damby DE, Durant AJ, Dingwell DB. Bulletin of Volcanology. 77(7), doi:10.1007/s00445-015-0945-8

HCl uptake by volcanic ash in the high temperature eruption plume: Mechanistic insights (2014) Ayris PM, Delmelle P, Cimarelli C, Maters EC, Suzuki YJ, Dingwell DB. Geochimica et Cosmochimica Acta. 144, 188-201, doi:10.1016/j.gca.2014.08.028

Comment on “Scavenging of sulfur, halogens and trace metals by volcanic ash: The 2010 Eyjafjallajökull eruption” by Bagnato et al. (2013) (2014) Delmelle P, Ayris PM, Maters EC. 2014. Geochimica et Cosmochimica Acta. 127, 381-384, doi:10.1016/j.gca.2013.07.021


High Temperature Reactions between Gases and Ash Particles in Volcanic Eruption Plumes (2018) Delmelle P, Wadsworth F, Maters E, Ayris P. In: King P; Fegley B; Seward T (eds.) Reviews in Mineralogy and Geochemistry, Volume 84: High Temperature Gas-Solid Reactions in Earth and Planetary Processes. Mineralogical Society of America, Geochemical Society, 285-308, doi:10.2138/rmg.2018.84.8

Volcanic Influences on the Carbon, Sulfur, and Halogen Biogeochemical Cycles (2015) Delmelle P, Maters E, Oppenheimer C. In: Sigurdsson H, Houghton B, McNutt S, Rymer H, Stix J (eds.) The Encyclopedia of Volcanoes, Second Edition. Elsevier, 881-893, doi:10.1016/B978-0-12-385938-9.00050-X

Research Group

Telephone number

01223 748895

Email address