Magnetic and phase behavior of magnetic water-in-oil microemulsions

Brown Paul, Mohamed Azmi, Ardyani Tretya, Rogers Sarah E., Eastoe Julian,

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Type :	article
Subject :	TP Chemical technology
ISSN :	1097-3958
Main Author :	Brown Paul, Mohamed Azmi, Ardyani Tretya, Rogers Sarah E., Eastoe Julian,
Title :	Magnetic and phase behavior of magnetic water-in-oil microemulsions

Place of Production :	CrossMark
Year of Publication :	2017

Full Text :

Magnetic water-in-oil microemulsions with anisotropic morphology have been generated by mixing singlechain magnetic surfactants (dodecyltrimethylammonium trichloromonobromoferrate, DTAF) with non-magnetic dichain analogues (didodecyldimethylammonium bromide, DDAB). Full phase diagrams have been mapped as a function of surfactant composition, water content, and temperature. It was shown that for all surfactant concentrations [Surfactanttotal], on replacing 30 wt% DDAB with DTAF optimum (i.e. wt% of the total surfactant) w ratios (w = [water]/[surfactant]) could be achieved; up to w = 120 for [Surfactanttotal] = 0.050 M. Small-angle neutron scattering (SANS) indicated that microemulsion droplets have a rod-like morphology with a radius commensurate with the surfactant tail length and an aspect ratio between 6 and 35. In the presence of a large magnetic field (6.7 T) no reorientation of the droplets was observed by SANS.

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