Biomedical Engineering Reference
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1.535
85.0
TCDDMA
1.530
84.5
1.525
84.0
1.520
83.5
1.515
83.0
0
20
40
Temperature (
60
80
100
°
C)
Figure 9.4
Temperature dependence of the refractive index of the neat acrylic sheet at
589.30nm(filledcircles)andtheregular transmittanceofBCnanocomposites (opencircles)
at 590 nm for the TCDDMA neat acrylic sheet and BC nanocomposite. (Reused with
permissionfromMasayaNogi,KeishinHanda,AntonioNorioNakagaito,andHiroyukiYano,
Applied Physics Letters,2005.87,243110Copyright2005,AmericanInstituteofPhysics.)
after which the mats were soaked into binary solvents of water/acetone of different
compositions to prevent the fibers from adhering to each other and to leave more void
for resin impregnation. In the second manufacturing procedure, ethanol was used as
solvent. The resulting nanocomposites had a fiber content varying from 7.4 to 66.1 wt%.
In the 500-800 nm range, the regular admittance remained above 75% regardless of fiber
content and the transmittance at 590 nm, normalized to the nanocomposite thickness,
showed an expected decreasing trend with higher fiber content (Figure 9.5).
The loss
100
: Acrylic resin
: Heat drying
: Acetone exchange
: Ethanol exchange
97
94
91
88
85
0
20
40
60
80
100
Fiber weight ratio (wt %)
Figure 9.5
Normalized regular transmittance at 590 nm and 100 mm thickness of BC
nanocomposite against fiber content. (Reused with permission from Nogi, M.; Ifuku, S.;
Abe, K.; Handa, K.; Nakagaito, A.N.; Yano, H., Fiber-content dependency of the optical
transparency and thermal expansion of bacterial nanofiber reinforced composites. Applied
Physics Letters,2006,88(13),133124,Copyright2006,AmericanInstituteofPhysics.)
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