DefinePK

Abstract

In this investigation, the critical micelle concentration of local surfactant was measured with the CMC is 6ml dissolved in 19 ml of water. It has ability to decrease the surface tension from 72 to 29.0 dyne/m. The foam capacity of the local surfactant in solution was investigated. The foam was generated by using a foam generator continuously. The variation of CMC then used to measure the foam capacities dynamically in foam generator. With the concentration 1x, 2x, 3x CMC, the surfactant was possible to produce foam capacity A, B and C cm. The foam capacity then measure in the presence of the coffee colloidal particle and Cd ion contaminant with the foam capacity, E, F and G cm for 1x, 2x, 3x CMC respectively. The foam capacity of SDS was first evaluated at different concentrations. The results show that the decreased foam capacity and stability was more distinct in the presence of coffee colloidal particles than Cd ions contaminant. The colloidal particles of coffee may have stronger interaction with SDS and thus reduce the formation of the foam.