PHYS01200704032 Debes Ray - Homi Bhabha National Institute

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Chapter 5: Correlating Block Copolymer Self-Assembly to the Gold Nanoparticle Synthesis show strong build-up of scattering intensity in the low-Q region with increase in the temperature. This is an indication of enhanced micellization with the increase in the temperature for all the block copolymers. Unlike F88, it is observed for P85 and P105 that the scattering at higher temperature (75 o C) show a linear Q-dependence on log-log scale in low- Q region, suggesting temperature-induced sphere-to-rod-like transition for P85 and P105 micelles. This is expected as a result of dehydration of PEO shell. On the other hand, highly hydrophilic F88 block copolymers form spherical micelles even up to at higher temperature. The fitted micellar parameters in these systems are given in Table 5.4. Table 5.4 shows that micelles coexist with unimers at lower temperature (30 o C). The micelles fraction depends on the hydrophilicity and increases in the order F88 < P85 < P105 as the hydrophilicity of the block copolymer decreases. As the temperature increases, more and more unimers convert to micelles. It is found that there are only micelles at 50 o C for all the block copolymers. The shape of the micelles remains same (spherical) for F88 whereas P85 and P105 micelles become ellipsoidal. As the temperature is increased to 75 o C, both P85 and P105 transform to rod-like micelles. It may be mentioned that since no lower cut-off in the SANS data for rod-like micelles are seen, the micelles are fitted having length greater than that can be measured from the accessible range (> 2π/Q min ~ 100 nm) of the present data. The role of self-assembly of block copolymer has been used to correlate with the synthesis of gold nanoparticles. The self-assembly is tuned as discussed above by varying chemical structure of block copolymer and temperature. 116
Absorbance Absorbance Chapter 5: Correlating Block Copolymer Self-Assembly to the Gold Nanoparticle Synthesis 5.3.2. Gold Nanoparticle Synthesis with Different Block Copolymers (a) 0.5 0.4 0.3 1 wt% F88 + 0.002 wt% HAuCl4.3H2O + 0.004 wt% HAuCl4.3H2O + 0.006 wt% HAuCl4.3H2O + 0.008 wt% HAuCl4.3H2O + 0.010 wt% HAuCl4.3H2O + 0.012 wt% HAuCl4.3H2O + 0.016 wt% HAuCl4.3H2O + 0.020 wt% HAuCl4.3H2O 0.2 0.1 0.0 400 500 600 700 800 Wavelength (nm) (b) 0.15 0.10 1 wt% P105 + 0.002 wt% HAuCl4.3H2O + 0.004 wt% HAuCl4.3H2O + 0.006 wt% HAuCl4.3H2O + 0.008 wt% HAuCl4.3H2O + 0.010 wt% HAuCl4.3H2O + 0.014 wt% HAuCl4.3H2O + 0.016 wt% HAuCl4.3H2O + 0.018 wt% HAuCl4.3H2O + 0.020 wt% HAuCl4.3H2O 0.05 0.00 400 500 600 700 800 Wavelength (nm) Figure 5.3. The gold salt concentration normalized SPR peaks of (a) 1 wt% F88 and (b) 1 wt% P105 with varying HAuCl 4 .3H 2 O concentration. The synthesis of gold nanoparticles similar to that for P85 (see Chapter 4) has also been carried out with block copolymers F88 and P105. These block copolymers vary in their 117
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SYNTHESIS AND CHARACTERIZATION OF B
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STATEMENT BY AUTHOR This dissertati
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DECLARATION I, hereby declare that
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Acknowledgements I would like to ex
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2. BLOCK COPOLYMER-MEDIATED SYNTHES
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5. CORRELATING BLOCK COPOLYMER SELF
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SYNOPSIS OF THE THESIS TO BE SUBMIT
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synthesis for its dependence on gol
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interactions between the templating
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utilized in the formation of nanopa
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nanoparticle-protein conjugate conf
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LIST OF FIGURES Figure 1.1. The len
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Figure 4.2. UV-visible absorption s
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Figure 5.9. (a) Absorbance (Abs max
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Figure 7.5. Integrated absorbance o
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Chapter 1 Synthesis, Characterizati
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Chapter 1: Synthesis, Characterizat
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Chapter 2 Block Copolymer-mediated
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Chapter 2: Block Copolymer-mediated
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Time-dependent Absorbance Chapter 2
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Chapter 3: Multi-Technique Approach
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d/d (cm -1 ) Chapter 7: Interaction
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d/d (cm -1 ) d/d (cm -1 ) Chapter 7
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Chapter 7: Interaction of Gold Nano
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Chapter 8: Summary Chapter 1 introd
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Chapter 8: Summary hence synthesis.
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Chapter 8: Summary irrespective of
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24. R. Elghanian, J.J. Storhoff, R.
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69. J.F. Hainfeld, D.N. Slatkin, T.
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119. N.S. Cameron, M.K. Corbierre a
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165. J.H. Lambert, Photometria sive
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210. D. Ray and V.K. Aswal, Confere
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9. SANS Studies of Temperature-depe
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14. Multi-technique Approach for th
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PHYS01200704032 Debes Ray - Homi Bhabha National Institute

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