Biomedical Engineering Reference
In-Depth Information
separated by centrifugation the two-phase SC (1.6 wt%)-SA (0.4 wt%)-DSS (0.22 wt %)
system (point A on the phase diagram, Figure 5), containing 3 um particles. The emulsions
W-SC (0.44 wt%)-SA ( 0.67 wt%), W-SC (0.73 wt%)-SA (0.59 wt%), W-SC (1.02 wt%) -
SA (0.52 wt%), and W-SC (1.6 wt%)-SA (o.4 wt%) containing 15% vol, 25% vol, 35% vol
and 50% vol alginate-enriched dispersed phase and placed on the phase diagram along the
same tiel line connecting compositions of the coexisting phases were then characterized
through their viscoelastic behaviour. First, the mixture was presheared at 500/s for 900 s, in
order to wipe out any previous mixing history.
Figure 7. The dynamic modules in dependence on the frequency of the aqueous SC(1.6 wt%)-SA(0.4
wt%)-DSS(0.22 wt%) system at q=0.14 and 296 K.
The sample was allowed to relax for 60 s, leaving enough time for full relaxation of the
deformed droplets. Finally, a dynamical spectrum was measured in order to characterize the
state of the emulsion. The obtained results are presented in Figure 7. The spectrum of the
emulsion shows the existence of a low frequency plateau. Such a plateau would be the
signature of a weak (small G' values) network structure at the emulsion scale (lower
frequencies = larger structure scale).
C
ONCLUSION
The use of nano and micro particles to affect the phase separation and morphology in
(bio) polymer mixtures is a topic of great scientific and technological interest. We have
shown that if protein enriched phase of a two phase aqueous protein-polysaccharide system
Search WWH ::
Custom Search