Environmental Engineering Reference
In-Depth Information
m
n
O
O
CH
2
CH
2
O
CH
2
CH
2
x
CF
2
CF
2
y
F
Figure 2.22
Amphiphilic-block polymer formed by grafting a side chain with
luoralkyl and a PEG moiety to a block copolymer
2.5.3.3.2 Heterogeneous Surfaces
Another approach in the design of novel anti-fouling polymer surfaces is the
incorporation of surfaces with mixed characteristics. These surfaces generally have
both hydrophilic and hydrophobic characters.
Finlay and co-workers [86] designed a patterned surface containing alternating
luorinated and PEGylated strips of various widths, ranging from 2 to 500 mm on
silicon wafers using photolithography combined with vapour phase deposition.
The silicon square arrays measured 1 cm by 1 cm with either a homogeneous
PEGylated or luorinated background. The
Ulva
zoospores settled at a higher density
on the luorinated strip when compared to the PEGylated strips. The settlement of the
zoospores was highly dependent on both the width of the strips and their interaction.
On the luorinated background, the settlement of zoospores did not depend on the
size of the strip, whereas, the size of the PEGylated strip affected the settlement of
the spores. The lowest density of settlement was observed when the pattern spacing
