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Thermal behaviour of Ni(II) nitrate hydrate and its aerosols

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Abstract

Fine, hollow, spherical particles with an average size of one micronmeter were formed through pyrolysis of aerosol of nickel nitrate solution. The aerosol product obtained by fast heating to 450°C consisted of tiny crystallites of NiO, hydrated nitrate, and other non-crystalline phase(s). By heating above 480°C, it consisted only of crystalline NiO. To understand the reactions occurring during the aerosolization process, thermal analysis was conducted on nickel nitrate hexahydrate in stagnant and flowing air using different heating rates. The mechanism for the decomposition of nickel(II) nitrate hexahydrate is proposed.

Zusammenfassung

Durch Pyrolyse eines Aerosols von Nickelnitratlösung werden feinkörnige, hole, kugelförmige Partikel mit einer durchschnittlichen Größe von einem Mikrometer gebildet. Das durch schnelles Erhitzen auf 450°C erhaltene Aerosolprodukt bestand aus winzigen NiO-Kristallen, aus hydratiertem Nitrat und aus anderen nichtkristallinen Phasen. Durch Erhitzen über 480°C erhält man ausschließlich kristallines NiO. Zum Verständnis der während des Aerosolierungsvorganges ablaufenden Reaktionen wurde in ruhender und dynamischer Luftatmosphäre sowie bei verschiedenen Aufheizgeschwindigkeiten eine Thermoanalyse von Nickelnitrat-Hexahydrat durchgeführt. Im Ergebnis konnte ein Mechanismus für die Zersetzung von Nickel(II)-nitrat-Hexahydrat entwickelt werden.

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Authors and Affiliations

  1. Chemical Engineering Department, Texas A & M University, 77843, College Station, TX, USA

    A. M. Gadalla & Hsuan -Fu Yu

Authors
  1. A. M. Gadalla
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  2. Hsuan -Fu Yu
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We gratefully acknowledge support of this research by the Regents of Texas A & M University through the AUF-sponsored Materials Science and Engineering Program.

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Gadalla, A.M., Yu, H.F. Thermal behaviour of Ni(II) nitrate hydrate and its aerosols. Journal of Thermal Analysis 37, 319–331 (1991). https://doi.org/10.1007/BF02055934

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  • DOI: https://doi.org/10.1007/BF02055934

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