Structural and hydrophobic-hydrophilic properties of nanosilica/zirconia alone and with adsorbed PDMS |
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Authors: | I.Y. SulymM.V. Borysenko,O.V. GoncharukK. Terpilowski,D. SternikE. Chibowski,V.M. Gun&rsquo ko |
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Affiliation: | a Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kyiv, Ukraine b Faculty of Chemistry, Maria Curie-Sk?odowska University, 20031 Lublin, Poland |
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Abstract: | Two nanosilica A-300/zirconia (SZ) composites at zirconia content CZrO2=5 and 20 wt.% were synthesized using a wet impregnation method with zirconium acetylacetonate as a precursor. The specific surface area of SZ is larger than that of A-300 because zirconia is composed of nanoparticles (crystallites of 4 nm in average size at CZrO2=20 wt.%) smaller than those of the initial silica (dav ≈ 11 nm). A-300 and SZ modified by polydimethylsiloxane (PDMS at molecular weight 1700 and 7960) in amounts of 5, 10, 15, 20 and 40 wt.% remained in the powder state with aggregates of primary particles smaller than those of A-300. SZ is more hydrophilic than silica but PDMS/SZ is more hydrophobic (maximum hydrophobic at CPDMS 15-20 or 40 wt.%) than PDMS/A-300. |
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Keywords: | 61.05.C&minus 61.43.Er 61.43.Gt 67.30.hp 68.08.&minus p 68.35.bj 68.43.Pq 68.47.Jn |
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