Séminaires - Pôle PCM
Vendredi 25 novembre 2022, 13h00 - Amphi/Teams
Le 25 nov. 2022
Nom : Dr Ali ABOUDZADEH
Titre: "Cyclic Polyethylene Glycol as Gold Nanoparticle Surface Ligand: Synthesis, Colloidal Stability and Unexpected Behaviour in Ethanol".
Abstract: Cyclic polymers behave different than linear polymers due to the lack of end groups and smaller coil dimensions. On the other hand, gold nanoparticles (AuNPs) continue to attract attention across a wide range of fields due to their optical properties and biocompatibility. In this study, an approach to synthesize macrocyclic poly(ethylene glycol)s (PEGs) containing a pendant thiol group is introduced, which is demonstrated to be able to attach to gold surfaces [1]. Then, the possibility of applying synthesized cyclic PEG on inorganic gold nanoparticles (AuNPs) is explored, with particular attention to how this polymer topology might affect the colloidal stability [2]. Finally, it will be shown that the use of PEG brush with cyclic topology as a stabilizer for AuNPs prevents their sedimentation, ensuring the colloidal stability in ethanol at −25 °C (as the second most important solvent after water for biological applications) for at least some months [3].
1. M. Ali Aboudzadeh et al., Polym. Chem., 2019, 10, 6495-6504.
2. M. Ali Aboudzadeh et al., ACS Macro Lett. 2020, 9, 11, 1604–1610.
3. M. Ali Aboudzadeh et al., Soft Matter, 2021,17, 7792-7801.
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