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Abstract
This paper reports the size of reverse micelles (RMs) in AOT/octane/H2O and CTAB/hexanol/H2O microemulsions using magnetic resonance (MR) pulsed field
gradient (PFG) measurements of diffusion. Diffusion data were measured using the pulsed gradient stimulated echo (PGSTE) experiment for surfactant molecules residing in the RM interface. Inverse Laplace transformation of these data generated diffusion coefficients for the RMs, which were converted into hydrodynamic radii using the Stokes−Einstein relation. This technique is complementary to those previously used to size RMs, such as dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS), but also offers several advantages, which are discussed. RM sizes, determined using the PGSTE method, in the AOT (sodium bis(2-ethylhexyl) sulfosuccinate) and CTAB (cetyltrimethylammonium bromide) microemulsions were compared with previous DLS and SAXS data, showing good agreement. Methods for determining number
distributions from the PGSTE data, through the use of scaling factors, were investigated.
gradient (PFG) measurements of diffusion. Diffusion data were measured using the pulsed gradient stimulated echo (PGSTE) experiment for surfactant molecules residing in the RM interface. Inverse Laplace transformation of these data generated diffusion coefficients for the RMs, which were converted into hydrodynamic radii using the Stokes−Einstein relation. This technique is complementary to those previously used to size RMs, such as dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS), but also offers several advantages, which are discussed. RM sizes, determined using the PGSTE method, in the AOT (sodium bis(2-ethylhexyl) sulfosuccinate) and CTAB (cetyltrimethylammonium bromide) microemulsions were compared with previous DLS and SAXS data, showing good agreement. Methods for determining number
distributions from the PGSTE data, through the use of scaling factors, were investigated.
Original language | English |
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Pages (from-to) | 11699 |
Number of pages | 8 |
Journal | Langmuir |
Volume | 28 |
DOIs | |
Publication status | Published - 14 Jul 2012 |
Keywords
- NMR
- reverse micelle sizing
- diffusion measurements
- pulsed gradient spin echo
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Dive into the research topics of 'Sizing of Reverse Micelles in Microemulsions using NMR Measurements of Diffusion'. Together they form a unique fingerprint.Projects
- 1 Finished
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Magnetic Resonance Investigation of Pattern Formation in the Belousov-Zhabotinsky Reaction Dispersed in an AOT Water-in-Oil Microemulsion
Britton, M. (Principal Investigator)
Engineering & Physical Science Research Council
15/03/06 → 14/03/09
Project: Research Councils