Simulation of dynamics of adsorption of mixed protein-surfactant on a bubble surface

Vitasari, Denny and Grassia, Paul and Martin, Peter (2013) Simulation of dynamics of adsorption of mixed protein-surfactant on a bubble surface. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 438. pp. 63-76. ISSN 0927-7757 (https://doi.org/10.1016/j.colsurfa.2012.12.007)

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Abstract

The dynamics of adsorption of mixed protein–surfactant on a bubble surface is simulated mathematically. The model for the adsorption dynamics is developed based on the Ward–Tordai equation combined with the Frumkin adsorption isotherm. The simultaneous equations are solved using the Newton method for iteration. Base case adsorption and diffusion parameter values for the simulation were sourced from literature. It was found that protein arrives on the surface at a later time than surfactant. At this later time, the protein replaces the surfactant resulting in depletion of surfactant on the surface. There is, however, less protein adsorbed in the presence of more surfactant in the bulk. In contrast, more protein stays in the subsurface layer under these conditions. In addition to the base case simulation and a comparison to the experimental data available in the literature, a parametric study was performed to explore the effects of varying adsorption and diffusion parameters. The parametric study varying the protein surface affinity revealed that below a certain critical affinity, protein tends not to replace surfactant on the surface, even though the affinity of protein remains higher than that of surfactant. Therefore, protein molecules need to have sufficiently high affinity to displace surfactant molecules from the surface. Another parametric study setting a fixed protein surface affinity and varying relative diffusivity and surface affinity of surfactant (for a specified maximum possible surface capacity of surfactant) concluded that with high relative diffusivity and low surfactant affinity (relative to protein), the displacement of surfactant on the surface is more likely to occur.

  • Item type:Article
    ID code:52046
    Dates:
    Date
    Event
    5 December 2013
    Published
    Notes:Special Issue: A collection of papers presented at the 9th EUFOAM Conference, Lisbon, Portugal, 8--11 July 2012, edited by M. Emilia Rosa, M. Fátima Vaz and P. Teixeira
    Subjects:Technology > Chemical technology
    Department:Faculty of Engineering > Chemical and Process Engineering
    Depositing user: Pure Administrator
    Date deposited:03 Mar 2015 11:10
    Last modified:08 Apr 2024 22:08
    URI:https://strathprints.strath.ac.uk/id/eprint/52046
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