Chemistry Reference
In-Depth Information
50
40
30
20
10
0
-100
-50
0
50
100
ζ
(mV)
Figure 1 Effective mean droplet diameter d
32
values of the emulsions (
J
) and the
emulsion + saliva mixtures (
K
) as a function of the
z
-potential. Also shown
are some light microscopy pictures of the corresponding mixtures. Scale bar
¼
200
m
m
12
10
8
6
Reversible
flocculation
Irreversible
flocculation
4
No flocculation
2
0
-100
-50
0
50
100
ζ
(mV)
Figure 2 The width of the particle-size distribution, defined as (d
0.9
d
0.1
)/d
0.5
, for the
differently charged emulsions before mixing (
&
) and after mixing (
'
) with
saliva. Existence and reversibility of flocculation is indicated
distribution width showed no changes upon saliva addition for emulsions
stabilized with SDS, b-lg (pH
¼
6.7) and Tween 20 (
z
o
0 mV). On the other
hand, for positively charged emulsion droplets stabilized with b-lg (pH
¼
3.0),
Search WWH ::
Custom Search