Izvorni znanstveni članak

https://doi.org/10.5562/cca2749

Iron Oxyhydroxide Aerogels and Xerogels by Hydrolysis of FeCl₃ ∙ 6 H₂O in Organic Media: Early Stages

Károly Lázár ; Centre for Energy Research, Hungarian Academy of Sciences, EKBI, Konkoly Thege M. 29-33, 1121 Budapest, Hungary
István Lázár ; Department of Inorganic Chemistry, University of Debrecen, Egyetem tér 1, 4010 Debrecen, Hungary
György Sáfrán ; Centre for Energy Research, Hungarian Academy of Sciences, MFA, Konkoly Thege M. 29-33, 1121 Budapest, Hungary
Anett Szilágyi ; Department of Inorganic Chemistry, University of Debrecen, Egyetem tér 1, 4010 Debrecen, Hungary

Sažetak

Formation of iron oxyhydroxide aerogel and xerogel by hydrolysis of FeCl₃ ∙ 6 H₂O was studied in organic media using water available solely from the starting iron salt. Ethylene glycol (EGLY), dimethyl sulfoxide (DMSO) and dimethyl formamide (DMFA) solvents were used. Products were analysed with specific surface area and TEM measurements. Early stages of hydrolysis and progress of gelation were followed by Mössbauer spectroscopy of frozen reaction mixtures. Presence of transient species and increase of the probability of the Mössbauer effect was observed in the early phase (0 – 60 min). Hydrolysis and gelation were the faster in EGLY, proceeded with medium rate in DMSO and were the slowest in DMFA.

Ključne riječi

iron hydrolysis; transient components; organic solvents; recoilless fraction; Mössbauer spectroscopy

Hrčak ID:

151117

URI

https://hrcak.srce.hr/151117

Datum izdavanja:

31.12.2015.

Posjeta: 2.160 *