Interaction of Particles with Surfactant Thin Films: Implications for Dust Suppression
| Autor: | Deming Wang, Vincent S. J. Craig, Xiaolong Zhu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Foaming agent 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Contact angle Chemical engineering Pulmonary surfactant Electrochemistry Meniscus Particle General Materials Science Particle size Laplace pressure Thin film 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir. 35:7641-7649 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | Understanding the interaction of particles with foams is important in antifoaming applications and dust suppression. In the former, the aim is for the particles to break the foam, whereas in the latter it is desirable that the stability of the foam is maintained or enhanced. The interaction of particles of different wettabilities with thin surfactant films is investigated with a Sheludko cell, enabling the thinning and rupture of the films to be studied in the presence and absence of a particle, using white-light interferometry. The films were prepared from the surfactant cetyltrimethylammonium bromide and a commercial dust suppression foaming agent. The film lifetimes are extended upon the addition of hydrophilic particles and reduced upon the addition of hydrophobic particles with advancing contact angles >90°. The Laplace pressure in the film surrounding a particle is calculated as a function of the contact angle and particle size, revealing that the meniscus surrounding hydrophilic particles has a positive Laplace pressure, which increases the lifetime of the film. |
| Databáze: | OpenAIRE |
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