The measurement of droplet size distribution of water-oil emulsion through NMR method

Document Type : Research Paper


1 Department of Chemical Engineering, University of Isfahan, Isfahan, Iran

2 Department of Chemistry, University of Isfahan, Isfahan, Iran


The effects of water/oil volume ratio, type and concentration of demulsifier, water salinity and mixing speed on the average water droplets size in water-oil emulsion are evaluated at different times through NMR measurements.The type and concentration of demulsifier have the greatest effects on the average droplet size with 38% and 31.5%, respectively. The water/oil volume ratio, water salinity and mixing speed are significant factors with 13.1%, 7.5% and 5.71%, respectively. The commercial demulsifier Break 6754 has the greater influenceon the average droplet size compared to the acrylic acid. The water droplets size increases upon increasing the concentration of demulsifier, the water volume ratio and the salinity of water and decreases upon increasing the mixing speed.


[1] I. B. Ivanov, P. A. Kralchevsky, Stability of emulsions under equilibrium and dynamic conditions, Colloids Surf. A: Physicochem. Eng. Asp., 128 (1997) 155-175.
[2] M. Fingas, B. Fieldhouse, M. Bobra, E. Tennyson, The physics and chemistry of emulsions. Environment Canada and Consult chem, Ottawa, Canada and US Minerals Management Service, Herndon, Virginia, 1993.
[3] D. B. Curtis, M. Aycibin, M. A. Young, V. H. Grassian, P. D. Kleiber, Simultaneous measurement of light-scattering properties and particle size distribution for aerosols: Application to ammonium sulfate and quartz aerosol particles, Atmos. Environ. 41 (2007) 4748-4758.
[4]S. Chodankar, V. K. Aswal, P. A. Hassan, A. G. Wagh, Structure of protein–surfactant complexes as studied by small-angle neutron scattering and dynamic light scattering, Physica B: Condens. Matter. 398 (2007) 112-117.
[5]D. S. Parker, W.J. Kaufman, D. Jenkins, Floc breakup in turbulent flocculation processes, J. Sanitary Eng. Div. 98 (1972) 79-99.
[6] P. S. Denkova, S. Tcholakova, N. D. Denkov, K. D. Danov, B. Campbell, C. Shawl, D. Kim, Evaluation of the precision of drop-size determination in oil/water emulsions by low-resolution NMR spectroscopy, Langmuir, 20 (2004) 11402-11413.
[7] C. P. Aichele, M. Flaum, T. Jiang, G. J. Hirasaki, W.acterization using a pulsed field gradient with diffusion editing (PFG-DE) NMR technique, J. Colloid interface Sci. 315 (2007) 607-619. G. Chapman, Water in oil emulsion droplet size characterization using a pulsed field gradient with diffusion editing (PFG-DE) NMR technique, J. Colloid interface Sci. 315 (2007) 607-619. 
[8] K.G. Hollingsworth, A.J. Sederman, C. Buckley, L.F. Gladden, M.L. Johns, Fast emulsion droplet sizing using NMR self-diffusion measurements, J. Colloid Interface Sci., 274 (2004), 244-250.
[9] N. van der Tuuk Opedal, G. Sørland, J. Sjöblom, Methods for droplet size distribution determination of water-in-oil emulsions using low-field NMR, Diffusion Fundamentals, 7 (2009) 1-29.
[10] P.P. Mitra, P.N. Sen, L.M. Schwartz, Short-time behavior of the diffusion coefficient as a geometrical probe of porous media, Phys. Rev. B, 47 (1993) 8565.
[11] M.D. Hurlimann, K.G. Helmer, L.L. Latour, C.H. Sotak, Restricted diffusion in sedimentary rocks. Determination of surface-area-to-volume ratio and surface relativity, J. Magn. Reson. A, 111 (1994) 169-178.
[12] K.S. Mendelson, M.H.  Cohen, The effect of grain anisotropy on the electrical properties of sedimentary rocks, Geophys., 47 (1982) 257-263.
[13] R. Roy, Design of experiments using the Taguchi approach, New York: Wiley; 2001.
Volume 2, Issue 1
March 2016
Pages 31-39
  • Receive Date: 14 April 2016
  • Revise Date: 24 September 2016
  • Accept Date: 26 September 2016
  • First Publish Date: 26 September 2016