New aspects of surface wetting revealed
Emulsification during surface wetting affects the spreading of complex liquids on solid surfaces. Credit: MPI-DS

The composition of the liquid plays a part in the wet process. The dynamics of spreading are affected by phase separation within the liquid. Their findings can be used to inform research in a number of areas. The study was published in a peer reviewed journal.

The Greek liqueur Ouzo has a pale effect when water is added. Cloud formation in the sky or biomolecular condensation within biological cells are some of the contexts in which this process occurs. Phase separation usually requires contact with particles that have been wet.

The researchers from the MPI-DS have found that phase separation drives can be achieved with both wet and dry solutions. Liquid spreading is usually caused by classical forces. Phase separation drives the surface's wetness even faster. During manufacturing processes involving the phase change, thin films of complex liquids can be manipulated.

Liquid Spreading is affected by phase separation.

The impact of phase separation on liquid spreading was revealed by the researchers. There was an unexpected spreading phenomenon compared to the well-established spreading laws for single component liquids. Close to the edge of the droplet, phase separation allows liquid components to be directed to a specific area. There is a strong correlation between the wet and dry parts of the body.

Developing new strategies for surface processing could be made easier by the new insights of the study. Oil recovery from surfaces and applications in manufacturing are included.

Youchuang Chao et al, How liquid–liquid phase separation causes active spreading, was published in the National Academy of Sciences. 10.1073/pnas.

Journal information: Proceedings of the National Academy of Sciences