Biomedical Engineering Reference
In-Depth Information
Figure 4.5
Schematic diagram of experimental apparatus. (1) Water bath, (2) microfeed
pump, (3) stirrer, (4) reactor, (5) N
2
gas, (6) EtOH/water/NH
3
solution, (7) EtOH/TEDS
solution [32].
NH
4
OH
Ethanol
Milli Q
water
After addition of 1.2 mL TEOS
& stirring white coloured ppts
of silica is formed
Figure 4.6
Graphical setup for the fabrication of silica particles.
added to this solution and total solution was stirred for three hours to get
white color precipitate. h is precipitate was washed with water 3-4 times
to remove traces of NH
4
OH and dried to collect in powder form. h is pro-
cedure yields silica particles which are highly monodispersed.
h is route is highly reproducible, produces monodispersed particles
and gives high yield. As characterization of nanoparticles is done using
spectroscopic and microscopic techniques. h erefore here silica particles
are characterized using SEM and TEM.
h ese particles prepared acts as core for preparation of core-shell nano-
composites like SiO
2
@Ag, SiO
2
@Au etc.
