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Oral Poster Presentation
Formation of monodisperse surfactant foamsWednesday (07.10.2020) 19:22 - 19:25
Foam is a dispersion of gas usually in liquid. It consists of gas bubbles that are separated from each other by thin lamellas. The structure of aqueous foams can be controlled in a targeted manner via the individual foam films via their stability and permeability. In the case of the liquid foams used to form polymer foams, their role is important. The stability of the individual films regulates the short-term stability of the foams. The gas permeability between the bubbles is important for the long-term stability of the liquid and the polymer foams.
The performed studies are part of the InSeL project – “Innovative Schaumstrukturen für effizienter Leichtbau”. One aim of the project is to prepre well defined liquid foams. These foams can be polymerised by selection of suitable mixtures of oligomers. The polymerised polymer solid foams are used as well defined templates for production of metal foams.
We measured the stability of individual foam films (lamellas) and their gas permeability. Nonionic and anionic microbiologically produced glycolipids are used as surfactants. Important questions for the choice of materials are the product purity and the content of functional groups in the hydrophilic and hydrophobic molecular parts.
With the help of a “Dynamic Foam Analyzer”, 3D foams were analysed and the results were compared with studies of single foam lamellae. A procedure for preliminary sorting of the suitability of the surfactants will be presented.