SI I

I I II I I II I. II


 X 44 umr




I I 1
i ,, ', ,, I *


 SB 10 eC 6 0 100 120


Figure 3.8 Profilometry data for non-treated (A) and plasma treated (B) 1.5 [im deep
elastomer textured surfaces at the 5 [im width spacing. Height of ridge: A = 1.433 rim, B
= 0.809 rm.



 Another feature of using a silicone surface is the effect of rearrangement of the

surface properties due to mobility of the chains and migration of low MW oligomers. To

examine this effect, unmodified elastomer samples were treated at two plasma power

levels, 50W and 100W using the same procedure as in the methods section of this

chapter. Contact angles of water on plasma treated samples were examined using the

sessile drop method immediately after treatment, 15 minutes after treatment, and one

week after treatment and the contact angles reported in Table 3.7.


Table 3.7
over time


- Water contact angles on plasma treated silicone samples after exposure to air

 Average Contact Angles (degrees)
 Treatment conditions 50 W, 5 min 100 W, 5 min
 Before Treatment 103 8 114 3
 Immediately after treatment < 10 <10
 15 minutes after treatment 15 4 <10
 1 week after treatment 77 + 7 45 28


X47um
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- I I I
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