Oxidation Kinetics of Oleic Acid in Mixed Fatty Acid Monolayers: Miscible Vs Immiscible Mixtures.
Fatty acid films at air-water boundaries modify the surface properties of water droplets, affecting cloud formation, and act as adsorption surfaces and/or mass transport barriers. These films are aged by atmospheric oxidants such as nitrate radicals (NO3). The kinetics of these reactions are different from those seen for gas-phase or bulk reactions. Current work explores how multi-component films differ from single-component films. Initial results suggested that oleic acid (OA) reacts more slowly with NO3 when stearic acid (SA) is present, but not when methyl oleate (MO) is co-deposited; recent work at ISIS has revealed that selective deuteration can affect measurements of surface coverage in immiscible mixed films (such as OA/SA, but not OA/MO). This calls into question the finding that OA reacts more slowly with NO3 when SA is present; this needs to be resolved before publication of the ILL work. The proposed work will test this hypothesis & provide more reliable kinetic parameters for the OA/NO3 reaction in SA presence. We will study a miscible system (OA/palmitoleic acid (POA)) to further confirm our hypothesis and determine the kinetics of the OA/NO3 system in POA presence
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Benjamin Thomas; Armando Maestro; MILSOM Adam; PFRANG Christian and SKODA Maximilian. (2018). Oxidation Kinetics of Oleic Acid in Mixed Fatty Acid Monolayers: Miscible Vs Immiscible Mixtures.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1518