Foam - Decision tree foam

5 important questions on Foam - Decision tree foam

A foam (single system) is stable, how come?

The air-water interface is densely packed with proteins.

A foam (single system) is unstable, how come?

Not sufficient proteins on interface
  • Turbid --> aggregate formation
  • Fast formation but unstable --> too small
  • Strong charge? --> too much repulsion

A foam (mixed system) has repulsion between the proteins and polysaccharides and forms less easy and/or is less stable, how come?

There are less proteins on the interface
  • Due to increased viscosity, proteins more slower to the interface and foam formation is inhibited
  • Polymer prevents proteins to move to the interface

Increase disproportionation and coalescence
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A foam (mixed system) has attraction between the proteins and polysaccharides and is more stable, how come?

  • Thicker interface --> all PS are attached to the proteins --> Prevents disproportionation and coalescence
  • Thicker interface and interfacial film --> PS are attached to the proteins and excess PS in water film

A foam (mixed system) has attraction between the proteins and polysaccharides and is not more stable, how come?

Less proteins and PS on the interface --> due to coacervate formation, limited diffusion to interface --> increase disproportionation and coalescence (possible sedimentation of the coacervates

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