The phase behavior and solubilization of isopropyl myristate in microemulsions containing hexadecyl trimethyl ammonium bromide and sodium dodecyl sulfate

Add time:09/10/2019    Source:sciencedirect.com

The phase behavior and solubilization of isopropyl myristate in microemulsions containing CTAB-SDS/IPM/butan-1-ol/aqueous NaCl (w = 0.05) with different XSDS values (the molar fraction of SDS in CTAB and SDS mixture) were studied using the ε − β diagram method. The microemulsion systems containing mixed CTAB-SDS surfactants have lower alcohol solubility (SA) and lower mass fraction of the alcohol in the interfacial layer (AS), but higher solubilization ability (SP*) compared to the microemulsions containing single surfactant SDS and CTAB. At different oil-to-water ratios (α), CTAB and SDS in microemulsions display significant synergistic effect, and the order of magnitude for SP* values is CTAB-SDS > CTAB ~ SDS. As the value of α increases, the order of magnitude for SA and AS values for different microemulsions can be ranked as: CTAB-SDS < CTAB < SDS. However, the SP* value of the SDS-based microemulsions would decrease, the SP* value of the CTAB-based microemulsions would increase, and the SP* value of the CTAB-SDS-based microemulsions would increase at first, and remain constant thereafter. In microemulsion systems CTAB (SDS, CTAB-SDS)/butan-1-ol/oil/aqueous NaCl (w = 0.05), the SA values in different oil phases have the order of magnitude: IPM > dodecane > octane, while the order of magnitude for SP* values is octane > IPM > dodecane. IPM has solubilization ability between octane and dodecane. With increasing salinity of the microemulsions, the SP* values, especially SP* values of the CTAB-SDS microemulsion systems would increase observably.

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