Soap film
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Soap films are thin layers of liquid surrounded by air. For example, if two soap bubbles come into contact, they merge and a thin film is created in between. Thus, foams are composed of a network of f
Figure 3: thin film interference in a soap bubble. Notice the golden yellow colour near the top where the film is thin and a few even thinner black spots
Figure 4: Picture of a film taken during its generation. The film is pulled out of a soapy solution and drains from the top.
Figure 5: Magnified view of black spots in a soap film
Wetting
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Wetting is the ability of a liquid to maintain contact with a solid surface by displacing another substance or material – either a gas, or other liquid not miscible with the wetting liquid – due to th
Water bead on a fabric that has been made non-wetting by chemical treatment.
Figure 6: Schematic of advancing and receding contact angles
Figure 9: Petal effect vs. lotus effect
Strands of an uncharged ferrocene-substituted polymer are tethered to a hydrophobic silica surface. Oxidation of the ferrocenyl groups produces a hydrophilic surface due to electrostatic attractions between the resulting charges and the polar solvent.