Soap molecules can self-assemble into bubbles when you blow air through a soapy loop. The soap bubble molecules form two layers that contain a layer of water in between. The soap forms a monolayer on the inside and a monolayer on the outside of the water. Each layer of soap is a self-assembled monolayer. The distance between the outer and inner layers of the bubble is about 150 nanometers. But the soap layer can become a bubble only when the conditions are just right. You need mostly air and very little water.
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