shows the effect of homogenization duration
on emulsion droplet size at different PMMA and BSA
concentrations with an organic to aqueous volume ratio
of 10:2 homogenized at 5000 rpm using the micro-tip
system. The viscosity of PMMA/MeCI2 solution (the
continuous phase) at 0.2, 0.4 and 0.6 g/ml was determined
to be 9.2, 44 and 313 cP, respectively. For aqueous
BSA solutions (the dispersed phase) at 0.2, 0.3
and 0.4 g/ml, their viscosities are 4.3, 40 and 410 cP,
respectively. The emulsion size decreases with time for
each condition studied. A more viscous continuous