The influence of alumino-silicate matrix composition on surface hydrophobic properties
AuthorsKljajević, Ljiljana M.
Kisić, Danilo D.
Nenadović, Miloš T.
Todorović, Bratislav Ž
Pavlović, Vladimir B.
Nenadović, Snežana S.
Article (Published version)
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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 geopolyme...r samples, GPMB and GPMK.
Source:Science of Sintering, 2019, 51, 2, 163-173
- Belgrade : ETRAN
- Synthesis, processing and characterization of nanostructured materials for application in the field of energy, mechanical engineering, environmental protection and biomedicine (RS-45012)
- Functional, Functionalized and Advanced Nanomaterials (RS-45005)
- Slovak Grant Agency VEGA No. 1/0538/15
- Restoration and construction of infrastructure for ecological and environmental research at Matej Bel University in Banská Bystrica, ITMS 262101200245