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Can mycelles of soap form without grease/oil in the middle?

Physics Asked on March 7, 2021

Does soap form mycelles even if there is no grease in the water, like the image below? (Is it even possible to form mycelles without grease/oil in the middle)?

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Or do soap molecules stand on their own with both parts imersed in water (hydrophilic and hydrophobic) like the image below?

enter image description here

One Answer

Yes, above a critical concentration called critical micelle concentration (CMC) a surfactant will form micelles spontaneously. It till depend also on the temperature. This is roughly because the reduction in entropy due to aggregation is compensated by the fact that now the surfactants are together and thus "more happy", gaining an energetical benefit from forming micelles. Having a kind of oil will help though.

Correct answer by JalfredP on March 7, 2021

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