Effect of the Synthesis Methods on Hydrophobic Properties of Modified Silicas
Composites based on fumed silica with surface hydrophobic groups were synthesized by chemical substitution of silanol groups' proton for trimethylsilyl (TMS) groups, adsorption of poly(dimethylsiloxane) (PDMS) and combined chemical-adsorption methods. Microcalorimetry measurements and values of...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SAGE Publications
2015-08-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.33.6-8.709 |
| _version_ | 1797282343943143424 |
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| author | Olena V. Goncharuk Iryna Ya. Sulym Konrad Terpilowski Evgeniy M. Pakhlov |
| author_facet | Olena V. Goncharuk Iryna Ya. Sulym Konrad Terpilowski Evgeniy M. Pakhlov |
| author_sort | Olena V. Goncharuk |
| collection | DOAJ |
| description | Composites based on fumed silica with surface hydrophobic groups were synthesized by chemical substitution of silanol groups' proton for trimethylsilyl (TMS) groups, adsorption of poly(dimethylsiloxane) (PDMS) and combined chemical-adsorption methods. Microcalorimetry measurements and values of the wetting contact angle with water (Θ) were obtained to investigate the hydrophobic properties of prepared materials. The hydrophilicity indexes (K h ) were determined from the relationship of heat of immersion in water Q w to non-polar decane Q d . The Θ and Q w demonstrated changes with increase of modification degree (d m ) for composites containing a monolayer of PDMS. All samples with excess of PDMS had high Θ (>110°) and relatively low Q w and K h . Composites modified with TMS groups demonstrated hydrophobic properties in accordance with K h at d m 0.7, whereas Θ > 90° is observed only for those samples with d m = 1.0. The different methods of synthesis may be applied based on the morphological characteristics and hydrophobicity of the samples. |
| first_indexed | 2024-03-07T17:11:27Z |
| format | Article |
| id | doaj.art-2207f601b94b4d00bd939298555dcee6 |
| institution | Directory Open Access Journal |
| issn | 0263-6174 2048-4038 |
| language | English |
| last_indexed | 2024-03-07T17:11:27Z |
| publishDate | 2015-08-01 |
| publisher | SAGE Publications |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj.art-2207f601b94b4d00bd939298555dcee62024-03-03T00:57:56ZengSAGE PublicationsAdsorption Science & Technology0263-61742048-40382015-08-013310.1260/0263-6174.33.6-8.709Effect of the Synthesis Methods on Hydrophobic Properties of Modified SilicasOlena V. Goncharuk0Iryna Ya. Sulym1Konrad Terpilowski2Evgeniy M. Pakhlov3Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Street, Kyiv 03164, Ukraine.Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Street, Kyiv 03164, Ukraine.Maria Curie-Skłodowska University, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland.Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Street, Kyiv 03164, Ukraine.Composites based on fumed silica with surface hydrophobic groups were synthesized by chemical substitution of silanol groups' proton for trimethylsilyl (TMS) groups, adsorption of poly(dimethylsiloxane) (PDMS) and combined chemical-adsorption methods. Microcalorimetry measurements and values of the wetting contact angle with water (Θ) were obtained to investigate the hydrophobic properties of prepared materials. The hydrophilicity indexes (K h ) were determined from the relationship of heat of immersion in water Q w to non-polar decane Q d . The Θ and Q w demonstrated changes with increase of modification degree (d m ) for composites containing a monolayer of PDMS. All samples with excess of PDMS had high Θ (>110°) and relatively low Q w and K h . Composites modified with TMS groups demonstrated hydrophobic properties in accordance with K h at d m 0.7, whereas Θ > 90° is observed only for those samples with d m = 1.0. The different methods of synthesis may be applied based on the morphological characteristics and hydrophobicity of the samples.https://doi.org/10.1260/0263-6174.33.6-8.709 |
| spellingShingle | Olena V. Goncharuk Iryna Ya. Sulym Konrad Terpilowski Evgeniy M. Pakhlov Effect of the Synthesis Methods on Hydrophobic Properties of Modified Silicas Adsorption Science & Technology |
| title | Effect of the Synthesis Methods on Hydrophobic Properties of Modified Silicas |
| title_full | Effect of the Synthesis Methods on Hydrophobic Properties of Modified Silicas |
| title_fullStr | Effect of the Synthesis Methods on Hydrophobic Properties of Modified Silicas |
| title_full_unstemmed | Effect of the Synthesis Methods on Hydrophobic Properties of Modified Silicas |
| title_short | Effect of the Synthesis Methods on Hydrophobic Properties of Modified Silicas |
| title_sort | effect of the synthesis methods on hydrophobic properties of modified silicas |
| url | https://doi.org/10.1260/0263-6174.33.6-8.709 |
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