Surfactant mixtures are widely used in detergent, personal care, enhanced oil recovery and flotation applications. Adsorption of nonionic/cationic/anionic (ex: n-dodecyl-â-D-maltoside(DM), and sodium dodecyl sulfonate) on solids such as alumina was studied in this work at different solution conditions of pH, mixing ratio and salt contents along with the wettability and zeta potential. Solution interactions were studied by analytical ultra centrifuge, surface tension, small angle neutron scattering and cryoTEM. It was found that surfactant adsorption is dramatically affected under certain pH conditions. The effects of pH, however, are reduced by synergistic interactions in the case of nonionic/anionic mixtures. Surface tension results reveal a negative interaction parameter suggesting that there are synergistic interactions between them. Importantly, only one peak indicative of one type of micelle was identified using analytical ultracentrifugation in the case of the above anionic/nonionic mixtures, while two types of aggregates were observed in the case nonionic/nonionic mixtures. The above information on surfactant aggregation helps to reveal the mechanisms of interactions between surfactants as well as their efficient application in various industrial processes.