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Essential oil has been widely used in many products. In this work, the location of the microemulsion region with eugenol was studied in two different surfactants namely sodium dodecyl sulphate, SDS (ionic) and Tween 80 (non-ionic). The phase diagrams were constructed for water/ SDS:hexanol (30:70)/eugenol oil and water/ Tween 80/ eugenol oil systems by titrating to turbidity. The result showed that microemulsion regions were present in both systems with the SDS:hexanol system formed a larger water-in-oil microemulsion region compared to Tween 80 system. In order to study the behaviour of the microemulsion with eugenol oil subjected to several conditions such as evaporation and rheology test, several weight ratios of eugenol oil to surfactants were studied. The weight loss during evaporation was carried under ambient condition. The rheological behaviour was also observed in both systems. The evaporation rate for the microemulsion with SDS was found to be higher than the equivalent counterpart but with Tween 80. The rheology study showed that the flow is of Newtonian behaviour with little or no shear thinning

Weight Loss in Microemulsion with Eugenol Oil