Nanostructured, electroactive and bioapplicable materials

Figure 3-4. BJH pore size distributions obtained from the nitrogen desorption
isotherms at -196 °C for the water extracted silica spheres prepared
with fructose concentration ranging from 30 to 70 wt %.......................... 91
Figure 3-5. Representative TEM images for the porous silica spheres: Low
magnification TEM showing the uniform spheres with average
diameter of 420 nm. .................................................................................. 92
Figure 3-6. Representative TEM images for the porous silica spheres. (a) High
magnification TEM of one silica sphere revealing the low density
core. (b) TEM picture of an ultra-thin section of a ground silica
sphere showing the overall porous structure. (c) High resolution
TEM image of the edge area of the sphere shown in (b). The
sample exhibits interconnected wormlike pores with diameter of
~3-5 nm. .................................................................................................... 93
Figure 3-7. Typical SEM images of the silica spheres prepared with 50 wt %
of fructose and TEOS/EtOH (v/v) ratio of 1:10. (a) Particles
aggregated into clusters. (b) Broken particles exhibit hollow cores. ........ 94
Figure 3-8. Typical SEM images of the silica spheres prepared with 50 wt %
of fructose through a two-step water in oil method. (a) Particles
without breakage. (b) Particle with broken pieces around. (c)
Broken particles from a cluster showing the hollow core......................... 95
Figure 4-1. Representative X-ray energy dispersive spectra for gold-silica
nanocomposite......................................................................................... 118
Figure 4-2. N2 adsorption–desorption isotherms at –196 °C for the annealed
gold-silica nanocomposite samples with varied gold content after
removal of DBTA template..................................................................... 119
Figure 4-3. BJH pore size distribution curves of the mesoporous gold-silica
nanocomposite derived from desorption isotherm branches................... 120
Figure 4-4. Powder XRD patterns for the mesoporous gold-silica
nanocomposite sample GS50-10............................................................. 121
Figure 4-5. (a) Representative TEM image of mesoporous gold-silica
nanocomposite sample (GS50-10). The darkest round spots are
gold nanoparticles. The gray framework feature is silica matrix
with inter-connected wormlike pores. Insert: an electron diffraction
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