Optimizing Hydrophobicity and Photocatalytic Activity of PDMS-Coated Titanium Dioxide
| Autor: | Werner Steffen, Sanghyuk Wooh, Lijun Ye, Hans-Jürgen Butt, Michael Kappl, Jie Liu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
wetting
Materials science Polydimethylsiloxane titanium dioxide technology industry and agriculture 02 engineering and technology macromolecular substances 010402 general chemistry 021001 nanoscience & nanotechnology photocatalytic 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Titanium dioxide Immersion (virtual reality) Photocatalysis General Materials Science Wetting hydrophobic grafted PDMS layer 0210 nano-technology Research Article |
| Zdroj: | ACS Applied Materials & Interfaces ACS Applied Materials and Interfaces |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Polydimethylsiloxane (PDMS) can be linked to the surface of metal-oxide photocatalysts by immersion and UV illumination. The surfaces become hydrophobic and keep their hydrophobicity even under extended UV exposure. Titanium dioxide (TiO2) is a prominent example of a metal-oxide photocatalyst. Here, we studied the influence of a grafted PDMS layer on the photocatalytic activity and wetting properties of TiO2. By varying the molecular weight of PDMS, we controlled the thickness of the polymer layer from 0.6 to 5.5 nm. We recommend a PDMS molecular weight of 6.0 kDa. It leads to a grafted PDMS layer thickness of 2.2 nm, a receding contact angle of 94°, a low contact angle hysteresis of 9°, and the layer is still photocatalytically active. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|