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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