DOI > 10.5291/ILL-DATA.9-10-1518

This proposal is publicly available since 07/05/2023

Title

Oxidation Kinetics of Oleic Acid in Mixed Fatty Acid Monolayers: Miscible Vs Immiscible Mixtures.

Abstract

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

Experimental Report

Download Data

Please note that you will need to login with your ILL credentials to download the data.

Download Data

Data Citation

The recommended format for citing this dataset in a research publication is in the following format:

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

Cited by

This data has not been cited by any articles.

Metadata

Experiment Parameters

  • Environment temperature

    ambient
  • Experiment energy

    2-20 A
  • Experiment moment

    0.007-0.2 A^-1
  • Experiment res energy

    10%
  • Experiment res moment

    14%

Sample Parameters

  • Formula

    • h-stearic acid
    • d-stearic acid (CD3(CD2)16CO2H)
    • d-oleic acid (CD3(CD2)7CD=CD(CD2)7CO2H)
    • h-palmitoleic acid
    • d-palmitoleic acid (CD3(CD2)5CD=CD(CD2)7COOH)