These are flashcards an notes made by students on topics like 'component', 'thermodynamics' and 'coacervation', originating from:

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- Wageningen University
ISBN-13 9990002019708
665 Flashcards & Notes
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Study Cards on component, thermodynamics, coacervation

Thermodynamics uses the concept of potential, what does that mean?
A difference in potential between two areas means that there is a driving force for change
What are 2 important things to note about the chemical potential?
  1. Each component has it's own chemical potential
  2. The chemical potential consists of two terms
    1. Chemical potential of the reference medium, the chemical potential of a phase of pure i, dependent on pressure and temperature
    2. Describes the dependence of the chemical potential on the composition, ai is the activity of component i, which is directly related to the composition.
What is the effect of a small defect in the film?
At a porosity of 0.01%, the effective permeability has gone up more than a factor 150.
What are 3 different formation mechanisms?
  • Melt-based formation mechanism
  • Solvent evaporation
  • Coacervation
How can coacervation be used as a coating? And in which 2 different ways?
It involves the creation of an insoluble, usually polymeric substance (the coacervate), which precipitates onto an available surface (such as the product surface).
  • This layer can be formed by reducing the solubility of one polymer. The solubility can be reduced by adapting the pH, temperature, or adding a non-solvent or salts.
  • Application of 2 polymers with opposite charges, which together from a precipitate. This can be done with aqueous or non-aqueous solutions.
When is a good film on a smooth surface formed?
If the contact angle between the substrate and the coating is low.
  • When the contact angle is zero, the spreading will be spontaneous.
  • If it is sufficiently small, but at least smaller than 90 degrees, it will be possible to form a smooth film: wetting of the surface takes place.
  • If the contact angle is longer, the solution will have the tendency to form individual drops on the surface, impeding they formation of a smooth film.
What are the 7 guidelines for selection of edible-barrier films?
  1. Thermodynamics
  2. Required time span
  3. Estimation of the total permeance
  4. Selection of the barrier material
  5. Consider the mechanics of the coating and product
  6. Select and application procedure
  7. Impact on product and process
How is temperature and moisture migration related?
Higher temperature is faster moisture migration.
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