Preprints

Filtering by Subject: Physical Chemistry

Fate of adsorbed organic compounds during transformation of ferrihydrite: implications for biogenic origin of Precambrian iron formations

Stanislav Jelavic, Andrew Mitchell, Karina Krarup Sand

Published: 2020-01-30
Subjects: Biogeochemistry, Chemistry, Earth Sciences, Physical Chemistry, Physical Sciences and Mathematics

The absence of organic compounds from Precambrian iron formations (IF) challenges the hypothesis of their biogenic origin. Here we address the fate of adsorbed organic compounds during transformation from ferrihydrite to hematite. We determined the binding energy between hematite and common molecular terminations found in extracellular polymeric substances and biofilms: carboxylic, alcohol and [...]

Pre-deliquescent water uptake in deposited nanoparticles observed with in situ ambient pressure X-ray photoelectron spectroscopy

Jack Jie Lin, Kamal Raj R, Stella Wang, Esko Kokkonen, Mikko-Heikki Mikkelä, Samuli Urpelainen, Nønne L. Prisle

Published: 2019-10-31
Subjects: Atmospheric Sciences, Chemistry, Oceanography and Atmospheric Sciences and Meteorology, Physical Chemistry, Physical Sciences and Mathematics

In this work we study the adsorption, or uptake, of water onto deposited inorganic sodium chloride and organic malonic acid and sucrose nanoparticles at low relative humidities from 0 to 16%. We employ the surface sensitive ambient pressure x-ray photoelectron spectroscopy technique, which has a detection sensitivity from parts per thousand. Our results show that water is adsorbed on sodium [...]

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