Naslov
Stability of Nanodispersions

Autori
Kallay, Nikola ; Preočanin, Tajana ; Kovačević, Davor

Vrsta, podvrsta i kategorija rada
Poglavlja u knjigama, znanstveni

Knjiga
Handbook of Nanophysics ; Nanoparticles and Quantum Dots

Urednik/ci
Klaus D. Sattler

Izdavač
CRC Press ; Taylor & Francis

Grad
Boca Raton (FL)

Godina
2010

Raspon stranica
28-1

ISBN
978-1-4200-7544-1

Ključne riječi
Nanoparticles, Dispersions, Stability, Aggregation, Sedimentation

Sažetak
Dispersion of particles in liquid medium may remain stable for long time but may also undergo aggregation, and consequently sedimentation. Stability takes place if the particles repeal each other due to their electric charge or the protection layer of adsorbed long chain molecules. Dispersions of nanoparticles (nanodispersions), in absence of protection layer, are as a rule less stable with respect to ordinary colloid dispersions as a consequence of their low charge. The theoretical model for interaction of nanoparticles takes into account the common ionic cloud, but not the partial overlap as in the case of relatively larger ordinary colloid particles. The model based on the extended Brønsted concept for ionic interactions is described. The charge distribution among nanoparticles is also taken into account. It was shown that nanodisperions may be electrically stabilized only at low ionic strength if they are sufficiently charged.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA