Resumen de Are surfactant molecules really oriented in the interface?
In aqueous medium, cetyltrimethylammonium bromide reacts with potassium hexacyanoferrate(III) and forms a precipitate by an ion-exchange reaction. But a bubble blown from an aqueous solution of polyoxyethylene sorbitan monooleate (Tween 80) and cetyltrimethylammonium bromide does not form a precipitate when floated on the surface of a potassium hexacyanoferrate(III) solution, as long as the bubble remains intact. This event is an example of definite orientation of cetyltrimethylammonium bromide molecules (surfactants) in the bubble interfaces.
