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

Ljiljana Kljajević | Zendy; Zuzana Melichová | Zendy; Danilo Kisić | Zendy; Miloš Nenadović | Zendy; Bratislav Todorović | Zendy; Vladimir B. Pavlović | Zendy; Snežaenadović | Zendy

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

Author(s) -

Ljiljana Kljajević,

Zuzana Melichová,

Danilo Kisić,

Miloš Nenadović,

Bratislav Todorović,

Vladimir B. Pavlović,

Snežaenadović

Publication year - 2019

Publication title -

science of sintering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.309

H-Index - 25

eISSN - 1820-7413

pISSN - 0350-820X

DOI - 10.2298/sos1902163k

Subject(s) - contact angle , materials science , geopolymer , metakaolin , silicate , ethylene glycol , surface energy , chemical engineering , microstructure , micrograph , fourier transform infrared spectroscopy , aluminosilicate , composite material , scanning electron microscope , cement , fly ash , organic chemistry , chemistry , engineering , catalysis

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.

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