| Note de contenu : |
- What is a foam ?
- A foam is less stable than a liquid
- Lifeline in a foam
- Elasticity is an essential factor
- Fig. 1 : Directly after their formation, the gas bubbles in the liquid rise
- Fig. 2 : In the drainage effect, liquid flows out the film surrounding the gas bubble, until the lamella finally tears
- Fig. 3 : Surfactant molecules consist of a hydrophilic and a hydrophobic part
- Fig. 4 : In the course of time, a "polyhedral foam" is formed from spheical foam bubbles
- Fig. 5 : Due to the drainage effect, the two interfaces of the lamella shift closer and closer together until the repulsion caused by the effect of charges with the same sigh prevents the liquid from flowing away completely |
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Accueil
Defoamers - an introduction in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/99 (10/1999)
