Phase behaviours study using different types of surfactant

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In this research, three types of surfactants were used: the first type is Sodium Dodecyl Sulfate SDS, the second type is commercial soap, and the third type is laboratory-prepared soap. Three soaps with different proportions were placed in a test tube containing an equal proportion of oil and water The samples were divided into two phases, one containing the original water salinity and the other containing the water salinity diluted to half. By exposing the samples to a different temperature, a layer of microemulsion was formed in both the soap that was prepared in the laboratory and the commercial soap. It was found that the first type of Sodium Dodecyl Sulfate SDS sulfactan mixed oil with water, and the microemulsion layer did not form.