PHYS01200704032 Debes Ray - Homi Bhabha National Institute

d/d (cm -1 )
Chapter 4: Optimization of the Block Copolymer-mediated Synthesis of Gold Nanoparticles
formation of nanoparticles. The value of saturation represents the maximum yield obtained
from that system. The decrease in the integrated absorbance beyond saturation region, if any
suggests aggregation of particles in that system. The substantial decrease in the stability for 2
wt% P85 could be because of large size of the nanoparticles formed with increase in this
system.
5
4
2 wt% P85
1 wt% P85
0.5 wt% P85
3
2
1
0
0.015 0.1 0.3
Q (Å -1 )
Figure 4.12. SANS data with varying block copolymer concentration. The solid curves are
the theoretical fits to the experimental data.
Table 4.1. Fitted parameters of the micelle structure at different P85 concentrations.
[P85]
(wt%)
Core Radius
R c
(nm)
Radius of
Gyration
R g
(nm)
Aggregation
Number
N
Number
Density
N d
(m -3 )
0.5 3.63 1.2 53 6.6 10 23
1.0 3.63 1.2 53 13.2 10 23
2.0 3.62 1.2 53 26.4 10 23
101