- Determination of pore space of a highly monodisperse O/W emulsion using NMR diffusometry. P Wiroonpochit, T Cosgrove, SW Prescott and Y Espidel. UK Colloids 2011, July 2011.
Emulsion systems are widely used in many commercial products in food, pharmaceutical, and cosmetic industries. They are also interesting to study the pore structure and connectivity. There are many non-NMR techniques which have been used to study these systems such as light scattering and optical and electron microscopy. However, for a highly concentrated emulsion a technique that can probe non-invasively and can be used in a concentrated emulsion is needed. Thus, NMR pulsed field gradient stimulated echo (PGSE NMR) method or NMR diffusometry is introduced.
A highly monodisperse oil-in-water (O/W) emulsion has been produced from polydimethylsiloxane (PDMS) and-Milli Q water with surfactants by a microfluidic method. After creaming, the highly concentrated emulsion has been studied using PGSE NMR looking at both the PDMS and water in the pore spaces around the PDMS droplets. Q-space data shows distinct minima which are directly related to the pore size distribution in the emulsion. Moreover, a nano-silicate particle (MQ resin, R3) was embedded in the PDMS droplets at concentration up to 50%wt. The MQ resin-PDMS emulsions are stable for a month or more.
Last edited: Friday September 10, 2010
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