Civil Engineering Reference
In-Depth Information
2.4.8
Miscellaneous Bacterial Cellulose Hybrids
Li
et al.
[282] and Yiang
et al.
[283] studied de formation of BC hybrids with cadmium
suli de NPs (BC/CdS NPs) by
in situ
deposition at er solvent exchange of water by
ethanol, followed by soaking with a Cd
2+
/thiourea mixture followed by hydrothermal
treatment, leading to the formation of CdS spherical NPs of about 8 nm [282], or hex-
agonal shape [283]. h e BC/CdS NPs nanocomposites are shown to have high visible
light photocatalytic ei ciency in the degradation of methyl orange. Cadmium selenide-
based hybrids (BC/CdSe NPs) have also been studied by Yiang
et al.
[284], following
similar approach to that used for CdS NPs, aiming at producing l exible membranes
with good mechanical properties and a strong green photoluminescence (Figure 2.33)
which are promising for applications in the i elds of security papers, sensors and l ex-
ible luminescent membranes.
h e preparation of BC hybrids with ZnO nanoparticles (BC/ZnO NPs) has been
addressed in some studies by
in situ
thermal treatment of Zn
2+
aqueous solutions [268,
269, 270]. It was demonstrated that BC is a good template to prepare ZnO NPs nearly
spherically in shape and with the average sizes of 20-50 nm [268] and 50-100 nm [270]
(Figure 2.34). h ese BC/ZnO NPs can also serve as sources of pure ZnO NPs upon BC
calcination [268].
Figure 2.33
Micrographs of BC/CdSe NPs membranes without (a) and with excitation. Reproduced with
permission from [284].
Figure 2.34
Typical aspect of BC/ZnO NPs prepared with dif erent concentrations of zinc acetate:
a) 0.25 wt%, b) 0.5 wt%, c) 1 wt% and d) 5 wt%. Reproduced with permission from [270].
