ABSTRACT
Due to the affinity of many surfactants, polymers, and proteins for the air-water interface, air can be readily dispersed in water (foams) and water can be dispersed in air (aerosols). While such systems have not found the widespread use in drug delivery applications as, e.g., emulsions, they are still interesting to consider in the present context, partly due to the similarities and differences between foams/ aerosols and emulsions, and partly due to some practical applications of aerosol and microbubble formulations in drug delivery.
