Naslov
Stability of nanoparticles and their interactions with polyelectrolytes

Autori
Kovačević Davor ; Begović, Tajana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
28HSKIKI Book of Abstracts / Rogošić, Marko - Zagreb, 2023, 89-89

Skup
28. hrvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Rovinj, Hrvatska, 28.03.2023. - 31.03.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
Nanoparticles ; Stability ; Interactions ; Polyelectrolytes

Sažetak
A very vital issue related to the application of various types of nanoparticles is a requirement for obtaining a stable dispersion. Due to the large specific surface area, nanoparticles tend to agglomerate over time which results in a separation of the dispersed phase from the continuous phase. One of the most promising tools for stabilization of nanoparticles is the adsorption of polyelectrolytes. The influence of polyelectrolytes on the stability of nanoparticles was explored in our study where the interactions of ceria nanoparticles with a strong polyanion, sodium poly(4-styrenesulfonate) were examined. For the interpretation of the experimental results obtained in our study we applied electrophoretic soft particles model, so called modified Ohshima model, based on the measurements of mobility of nanoparticles coated with a polyelectrolyte layer. The interpretation of the results leads to the value of the electrophoretic softness (i.e. the softness of the polyelectrolyte layer) of 1/λ = 3.03 nm, while the charge density of the polyelectrolyte is equal to ZeN = −0.032 mol dm-3. Finally, on the basis of performed experiments and calculations the adsorption density of polyelectrolyte adsorbed on ceria nanoparticles was found to be Γ = (5.42 ± 2.73) mg m−2. The results obtained for adsorption of polyelectrolytes on flat surfaces could also lead to the better understanding of the polyelectrolyte adsorption on nanoparticles. Therefore, we additionally studied the adsorption of PDADMA cations and PSS anions on Ti/TiO2 surface and a stable polymeric nanofilm that partially covers the surface was formed, without significant impact on the surface roughness. The obtained corrosion protection effectiveness values indicated that the corrosion properties were greatly enhanced upon polyion adsorption and polyelectrolyte coating formation on the flat TiO2 surface. The obtained results were additionally confirmed by inner surface potential measurements. The importance of presented adsorption experiments combined with appropriate interpretation lies in possible predictions of the behaviour of nanoparticles in polyelectrolyte solutions. Such findings could enable the preparation of suspensions having satisfactory stability which could lead to the improved applications of nanoparticles in various research fields.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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