The influence of alumino-silicate matrix composition on surface hydrophobic properties

Kljajević Ljiljana M.; Melichova Zuzana; Kisić Danilo D.; Nenadović Miloš T.; Todorović Bratislav Ž.; Pavlović Vladimir B.; Nenadović Snežana S.

doi:10.2298/SOS1902163K

Science of Sintering (Jan 2019)

The influence of alumino-silicate matrix composition on surface hydrophobic properties

Kljajević Ljiljana M.,
Melichova Zuzana,
Kisić Danilo D.,
Nenadović Miloš T.,
Todorović Bratislav Ž.,
Pavlović Vladimir B.,
Nenadović Snežana S.

Affiliations

Kljajević Ljiljana M.: Department of Materials Science, Vinča Institute of Nuclear Sciences, University of Belgrade, Serbia
Melichova Zuzana: Faculty of Natural Sciences, Matej Bel University, Banska Bystrica, Slovakia
Kisić Danilo D.: Laboratory for Atomic Physics, Vinča Institute of Nuclear Sciences, University of Belgrade, Serbia
Nenadović Miloš T.: Department of Materials Science, Vinča Institute of Nuclear Sciences, University of Belgrade, Serbia
Todorović Bratislav Ž.: Faculty of Technology of Leskovac, University of Niš, Serbia
Pavlović Vladimir B.: Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, University of Belgrade, Belgrade, Serbia
Nenadović Snežana S.: Department of Materials Science, Vinča Institute of Nuclear Sciences, University of Belgrade, Serbia

DOI: https://doi.org/10.2298/SOS1902163K
Journal volume & issue: Vol. 51, no. 2
pp. 163 – 173

Abstract

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The purpose of this investigation is to investigate the hydrophobicity of geopolymers, new alumino-silicate materials and the influence of Si/Al ratio on their surface properties. Contact angle measurement (CAM) as reliable indicator of hydrophobicity was determined for synthesized geopolymers using water and ethylene-glycol as reference liquids. Geopolymers were synthesized from various precursors: kaolin, bentonite and diatomite. Characterization of phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. Contact angle measurements confirmed that the geopolymers synthesized from metakaolin are the most porous, which can be explained by the smallest Si/Al ratio. The maximum value of contact angle and free surface energy (110.2 mJ/m2) has been achieved for geopolymer synthesized by diatoms (GPMD). SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel and is significantly different from the micrographs of other two geopolymer samples, GPMB and GPMK. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III 45012 and Grant no. III 45005]

Published in Science of Sintering

ISSN: 0350-820X (Print); 1820-7413 (Online)
Publisher: International Institute for the Science of Sintering, Beograd
Country of publisher: Serbia
LCC subjects: Technology: Chemical technology
Website: http://www.doiserbia.nb.rs/journal.aspx?issn=0350-820X

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