Hybrid nanocomposites from random polyelectrolytes and carbon dots

Postgraduate Thesis uoadl:3390568 22 Read counter

Unit:
Κατεύθυνση Επιστήμη Πολυμερών και Εφαρμογές της στη Βιομηχανία
Library of the School of Science
Deposit date:
2024-02-26
Year:
2024
Author:
Theodoropoulou Sophia
Supervisors info:
Αστέριος Πίσπας, Διευθυντής Ερευνών, Ινστιτούτο Θεωρητικής και Φυσικής Χημείας, Εθνικό Ίδρυμα Ερευνών (Επιβλέπων Καθηγητής)
Ερμόλαος Ιατρού, Καθηγητής, Τμήμα Χημείας, ΕΚΠΑ
Μαρίνος Πιτσικάλης, Καθηγητής, Τμήμα Χημείας, ΕΚΠΑ
Original Title:
Υβριδικά νανοσωματίδια τυχαίων πολυηλεκτρολυτών και κβαντικών τελειών άνθρακα
Languages:
Greek
Translated title:
Hybrid nanocomposites from random polyelectrolytes and carbon dots
Summary:
In this master thesis, we report the complexation of charged copolymers of random architecture with carbon quantum dots via electrostatic interactions. Carbon dot-based composite nanoparticles have attracted great interest due to their biological applications.
The current study focuses on the synthesis of double hydrophilic poly(2-dimethylaminoethyl methacrylate-co-oligo(ethylene glycol) methyl ether methacrylate), P(DMAEMA-co-OEGMA) copolymer via RAFT polymerization. In addition, negatively charged carbon dots (CDs) were produced by hydrothermal polycondensation reaction. Their complexation in aqueous solutions was achieved through electrostatic interactions between the oppositely charged units. Furthermore, the copolymer was converted into a strong cationic random polyelectrolyte and was used subsequently for the complexation with carbon dots. In addition, the weak anionic random polyelectrolyte poly(methacrylic acid-co-oligo(ethylene glycol) methyl ether methacrylate), P(MAA-co-OEGMA), was synthesized by RAFT polymerization and then used to study the complexation with positively charged carbon dots.
The molecular characterization of the novel copolymers was carried out using size exclusion chromatography (SEC) and spectroscopic techniques, namely, 1H-NMR and ATR-FT-IR. The obtained complexes were characterized through FT-IR spectroscopy as well. The physicochemical characterization of aqueous solutions of the copolymers and their complexes and also their response to external stimuli (pH, temperature, ionic strength) were conducted using dynamic and electrophoretic light scattering (DLS, ELS), and spectroscopic techniques such as UV-Vis, fluorescence and FT-IR. Finally, the interaction of selected complexes with iron (III) ions was studied through fluorescence spectroscopy.
Main subject category:
Science
Keywords:
Polyelectrolytes, carbon quantum dots, hybrid nanoparticles, complexes, RAFT polymerization
Index:
Yes
Number of index pages:
10
Contains images:
Yes
Number of references:
85
Number of pages:
129
File:
File access is restricted until 2024-08-27.

MSc_Thesis_TheodoropoulouSophia.pdf
5 MB
File access is restricted until 2024-08-27.