Surface Functionality and Water Adsorption Studies of α-Aluminium (III) Oxide Nanoparticles by near Infrared Spectroscopy

Peraya Hiranmartsuwan; Natthaya Siangdee; Alfred A. Christy

doi:10.4028/www.scientific.net/KEM.803.104

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 803Surface Functionality and Water Adsorption Studies...

Surface Functionality and Water Adsorption Studies of α-Aluminium (III) Oxide Nanoparticles by near Infrared Spectroscopy

Abstract:

The adsorption of water on aluminium (III) oxide nanoparticle surface was studied by near infrared (NIR) spectroscopy. The comparison of NIR spectra at 40% and 60% humidity were reported in this work and were analyzed using second derivative techniques. The second derivative spectra were used to understand the chemistry of adsorption of water molecules. Small amounts of samples were dried under vacuum at 230 °C before the analysis. The analysis of the spectra confirms the presence of three different hydroxyl groups on aluminium (III) oxide surface. The spectra acquired during the adsorption of water molecules show the characteristic peaks in the range of 5400-5100 cm^-¹ corresponding to the combination band of water molecules hydrogen bonded with hydroxyl groups. There is also evidence for the presence of free water in the bulk of aluminium oxide. Furthermore, the mass of water adsorption on Al₂O₃ nanoparticle surface have been determined by gravimetric analysis. The gravimetric analysis confirms the adsorption of water molecules by aluminium (III) oxide surface.

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Periodical:

Key Engineering Materials (Volume 803)

Pages:

104-108

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.803.104

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Online since:

May 2019

Authors:

Peraya Hiranmartsuwan*, Natthaya Siangdee, Alfred A. Christy

Keywords:

Aluminium (III) Oxide Nanoparticle, Near Infrared Spectroscopy, Second Derivative, Water Adsorption

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