Fluorosurfactant retention in the foam blanket during gravitational drainage of an aqueous film-forming foam
| Autor: | L.A. Richardson, David Megson, K. Shelbourne, J. Payne, J. Da Costa, H.K. Schofield |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
02 engineering and technology Blanket 010402 general chemistry 01 natural sciences chemistry.chemical_compound Colloid and Surface Chemistry Pulmonary surfactant Materials Chemistry Fluorocarbon Fluorosurfactant cardiovascular diseases Physical and Theoretical Chemistry Composite material chemistry.chemical_classification Heptane Aqueous solution 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Solvent Hydrocarbon chemistry lipids (amino acids peptides and proteins) 0210 nano-technology Biotechnology |
| Popis: | A model aqueous film-forming foam (AFFF) comprising a fluorocarbon surfactant (6:2 FTSaB), hydrocarbon surfactant, solvent, and water was deployed on a heptane fire with the gravimetrically-drained foam solution collected at regular time intervals and analysed for surfactant concentration. Foam drainage behaviour within the model foam system was non-linear for both control (no fire exposure) and fire-exposed tests, as would be expected. However, the concentration of fluorosurfactant within the drainage solution was initially lower, increasing with time. This suggests that the fluorosurfactants are retained within the foam blanket for longer than other constituents of the model foam. This is proposed to result from the unequal probability of rupture in bubbles comprising the foam blanket: as the rate of foam collapse decreases with time, bubbles with lower stability burst until those with a higher persistence and higher surfactant content remain. |
| Databáze: | OpenAIRE |
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