Biomedical Engineering Reference
In-Depth Information
Fig. 3
Schematic illustrations of SMA surface conformations. Cibacron Blue [Ciba]-
functionalized MPEO derivatives as SMA on
A
PEU-air and
C
PEU-water interfaces; and
stearic group [C
18
]-functionalized MPEO derivatives as SMA on
B
PEU-air and
D
PEU-
water interfaces. Legend for representing symbols applied in schemes is listed as shown
in Fig. 1 [77]. Reproduced from [173]
Fig. 4
Distributions of SMA hydrophobic stearic [C
18
] endgroups vs. hydrophilic PEG
spacer arms at various depth of MSPEO-modified PEU surface layer. Ratios of C
18
/C
1
s
vs.
cosine value of XPS takeoff angle [TOA] for SMAs with various-sized PEG spacers (2300
and 12 000 Da) respectively on air and water interfaces, as determined by angle-resolved
XPS [76]. Reproduced from [174]
asshowninFig.3b.Similarconformations(standing-upshowninFig.3c)
are also detected from the interface between water and the hydrophilic Ciba-
MPEO-modified PEU surfaces. This standing-up conformation reflects a very
congenial mixing state between the SMA bodies and the ambient phases. On
