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.

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Last edited: Friday September 10, 2010

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