Biomedical Engineering Reference
In-Depth Information
Figure 14.
(a) Measured dependencies of di
m
ensionless radii of the drop base,
L
=
L/L
m
, and radii
of the wetted region inside the porous layer,
l
=
l/l
∗
, over dimensionless time,
t
=
t/t
p
,where
t
p
is
the total time of imb
ib
ition into porous substrate [86]. (b) Dimensionless radius,
L
=
L/L
m
,against
dimensionless time,
t
=
t/t
max
, curve for the behaviour of different liquids spreading/evaporating on
solid substrates [97].
I. Superspreading
Since the early 90s, silicone surfactants have been the subject of substantial scien-
tific interest. Due to their exceptional wetting abilities, trisiloxanes, in particular,
have drawn significant attention recently. Trisiloxane surfactants are commonly
denoted as M(D
EO
n
R)M, where M represents the trimethylsiloxy group, M
=
,thetermD
=−
Si(CH
3
)(R
)
,whereR
=
(
CH
3
)
3
-SiO
−
−
(
CH
2
)
3
onto which is
polyoxyethylene group, EO
n
=
(
CH
2
CH
2
O)
n
, attached, with
n
as the average num-
ber of polyoxyethylene groups, and R stands for an end-capping group, usually
−
H,
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