Comparative Study on the Structure of Water in Reverse Micelles Stabilized with Sodium Bis(2-ethylhexyl) Sulfosuccinate or Sodium Bis(2-ethylhexyl) Phosphate in n-Heptane

Add time:09/29/2019    Source:infona.pl

The microstructure of water solubilized in H 2 O/surfactant/n-heptane ternary systems has been investigated by employing 1 H-NMR and FT-IR spectroscopic techniques. Two reverse micellar systems were prepared and studied, i.e., sodium bis(2-ethylhexyl) sulfosuccinate in n-heptane (H 2 O/AOT/n-heptane) and sodium bis(2-ethylhexyl) phosphate (cas 141-65-1) in n-heptane (H 2 O/NaDEHP/n-heptane). 1 H-NMR data showed that the chemical shift of water protons for the AOT and NaDEHP reverse micelles varied downfield and upfield, respectively, with an increase of the water content. The opposite shift directions with increasing water content are interpreted as due to a composition change of the solubilized water associated with head-groups and sodium counterions in reverse micellar systems. On the basis of deconvolution results of FT-IR spectra, a four-component model is proposed to interpret the FT-IR and 1 H-NMR results.

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