2. Materials and methods
2.1.Materials
Oil-in-water emulsions containing 10vol% of dispersed phase were produced in all cases. The oil phase was either commercially available sunflower oil or silicone oil (Sigma Aldrich ,United Kingdom) with density values shown in Table1. The aqueous phase was passed through a reverse osmosis unit and then a milli-Q water system. The emulsions were stabilized by Tween 20(polysorbate20, Sigma Aldrich, United Kingdom) dissolved in the continuous phase using at a concentration of 1 wt% of the whole emulsion system. The continuous phase viscosity was modified using varying quantities of Glycerol (Sigma Aldrich , United Kingdom) between 1and 87.5wt%. All materials were used with no further purification or modification of their properties.