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The conductivity and ultrafiltration methods are used to study the behavior of pure SDS, mixed SDS+C12OH and SDS+DTAB aqueous surfactant solution at 25 oC. The conductivity data indicate that the CMC of mixed surfactant solution decreases with increasing the addition of C12OH. This is due to the decrease of electrical repulsion at increasing the addition of alcohol. Contrast result with DTAB, the CMC increases with increasing of the addition of C12TAB (DTAB).
The ultrafiltration is performed for aqueous SDS solutions at different g-forces and pore sizes of membrane. The CMC of solution under different pressure, estimated from break point of filtrate concentration (Cfiltrate) versus initial concentration of SDS before filtration (CSDS) curve, decreases at increasing the g-force. For ultrafiltration SDS solution at 5,000 and 10,000 MWCO (5k and 10k) membrane, it was found that when CSDS below CMC concentration, the Cfiltrate is nearly same with the ¬CSDS, which represent all monomer of surfactant passed through the membrane. For CSDS above the CMC concentration, the Cfiltrate was found lower compare to CSDS. There are possibilities that the micelle deformed and passed through the membrane or the original of sub-micelle portion in the surfactant solution passed through the membrane.
The ultrafiltration of mixed SDS+C12OH aqueous surfactant solution gave lower filtrate concentration compare to the result from ultrafiltration of pure SDS. The addition of DTAB to SDS gave the contrast result with the addition C12OH. The filtrate concentration result is higher compare to the pure SDS. It seems the conductivity method affected the result of filtrate concentration. The results of ultrafiltration SDS and mixed SDS aqueous surfactant solution from this study are also compared with other researcher’s result.

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