Naslov
Electrokinetics of ripidolite and beidellite clays

Autori
Sondi, Ivan ; Milat, Ognjen ; Pravdić, Velimir

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

Izvornik
14th International Symposium "Chemistry of the Mediterranean". Chemical Speciation in the Marine Environment / Branica, Marko - Zagreb : CIM-IRB, 1996, 93-93

Skup
14th International Symposium:

Mjesto i datum
Primošten, Hrvatska, 15.05.1996. - 23.05.1996

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
electrokinetic measurements; ripidolite; beidellite clay

Sažetak
Ripidolite and beidillite show high negative electrokinetic potentials in the range from pH=2 (-10 mV; and 20 mV) to pH 10 (-60 mV; and 50 mV, respectively). Experiments were done of mechanical particle disintegration (dry milling), mimicking natural wear and weathering, resulting in increase of specific surface area (12.3 and 1.5 times) and of the cation exchange capacity (3.2, and 1.2 times, respectively). Such small particles, as shown by SEM and HRTEM figures, retain the crystal structure (X-ray) and surface bonds (FT-IR) unchanged, exhibiting reversal of charge (at pH 6.0, and 3.0, respectively). It was interpreted as creation of positively charged surfaces. These new surfaces exposed to fulvic acid in solution of NaCL at pH 6 showed no reversal of charge, but only a decrease for ripidolite, and no influence on beidellite.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA