Magnetic and Phase Behavior of Magnetic Water-in-Oil Microemulsions |
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| Authors: | Paul Brown Azmi Mohamed Tretya Ardyani Sarah E. Rogers Julian Eastoe |
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| Affiliation: | 1.Department of Chemical Engineering,Massachusetts Institute of Technology,Cambridge,USA;2.Department of Chemistry, Faculty of Science and Mathematics,Universiti Pendidikan Sulltan Idris,Tanjong Malim,Malaysia;3.ISIS, Science and Technology Facilities Council, Rutherford Appleton Laboratory,Chilton,UK;4.School of Chemistry,University of Bristol,Bristol,UK |
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| Abstract: | Magnetic water-in-oil microemulsions with anisotropic morphology have been generated by mixing single-chain magnetic surfactants (dodecyltrimethylammonium trichloromonobromoferrate, DTAF) with non-magnetic di-chain 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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| Keywords: | Magnetic microemulsions Cationic surfactants Small‐angle neutron scattering |
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