Effect of pore morphology and surface roughness on wettability of porous titania films
Surface hydrophobicity/hydrophilicity of titania (TiO _2 ) films, spin-coated on silicon wafers, were tuned by introducing surface mesopores with various morphologies using a triblock copolymer F38 as the template agent of different weight ratios via a sol-gel method. It is found that both the poros...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/abc770 |
| _version_ | 1797746894434205696 |
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| author | Bangyun Xiong Jingjing Li Chunqing He Xiuqin Tang Zizhao Lv Xiaofeng Li Xiqiang Yan |
| author_facet | Bangyun Xiong Jingjing Li Chunqing He Xiuqin Tang Zizhao Lv Xiaofeng Li Xiqiang Yan |
| author_sort | Bangyun Xiong |
| collection | DOAJ |
| description | Surface hydrophobicity/hydrophilicity of titania (TiO _2 ) films, spin-coated on silicon wafers, were tuned by introducing surface mesopores with various morphologies using a triblock copolymer F38 as the template agent of different weight ratios via a sol-gel method. It is found that both the porosity (2.92 ∼ 33.03%) and the surface roughness (0.22 ∼ 0.43 nm for arithmetic mean roughness and 0.28 ∼ 0.58 nm for root mean square roughness) of the films increase monotonically as increasing F38 ratio from 5 to 25 wt%, accompanied by distinct changes of pore morphology from isolated mesopores with pore sizes of 5 ∼ 7 nm to longer worm-like pores (30 ∼ 100 nm in length). The apparent static contact angle ( θ *) of the films with isolated mesopores is enhanced from ca. 90.6° to 100.1° as indicated by an increase of the roughness factor with incresing F38 from 5 to 15 wt%, which is in qualitative agreement with the Wenzel’s equation. Interestingly, the films with interconnected worm-like pores show obvious hydrophilicity ( θ * = 80.7°) with further increasing F38 ratio higher than 20 wt%. The reversed surface wettability show that not only surface roughness but also pore morphology could significantly affect the wettability of the mesoporous TiO _2 films. |
| first_indexed | 2024-03-12T15:43:19Z |
| format | Article |
| id | doaj.art-9a5b355e06324cdfb616d8f4232a4e24 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:43:19Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-9a5b355e06324cdfb616d8f4232a4e242023-08-09T15:52:12ZengIOP PublishingMaterials Research Express2053-15912020-01-0171111501310.1088/2053-1591/abc770Effect of pore morphology and surface roughness on wettability of porous titania filmsBangyun Xiong0https://orcid.org/0000-0001-7874-9220Jingjing Li1https://orcid.org/0000-0001-6048-5036Chunqing He2https://orcid.org/0000-0001-6439-4094Xiuqin Tang3Zizhao Lv4Xiaofeng Li5Xiqiang Yan6Guangdong Key Laboratory for Hydrogen Energy Technologies, School of Materials Science and Hydrogen Energy, Foshan University , Foshan 528000, People’s Republic of ChinaGuangdong Key Laboratory for Hydrogen Energy Technologies, School of Materials Science and Hydrogen Energy, Foshan University , Foshan 528000, People’s Republic of ChinaKey Laboratory of Nuclear Solid State Physics Hubei Province, School of Physics and Technology, Wuhan University , Wuhan 430072, People’s Republic of ChinaR & D Center for Non-power Nuclear Technology, School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology , Xianning 437100, People’s Republic of ChinaGuangdong Key Laboratory for Hydrogen Energy Technologies, School of Materials Science and Hydrogen Energy, Foshan University , Foshan 528000, People’s Republic of ChinaGuangdong Key Laboratory for Hydrogen Energy Technologies, School of Materials Science and Hydrogen Energy, Foshan University , Foshan 528000, People’s Republic of ChinaGuangdong Key Laboratory for Hydrogen Energy Technologies, School of Materials Science and Hydrogen Energy, Foshan University , Foshan 528000, People’s Republic of ChinaSurface hydrophobicity/hydrophilicity of titania (TiO _2 ) films, spin-coated on silicon wafers, were tuned by introducing surface mesopores with various morphologies using a triblock copolymer F38 as the template agent of different weight ratios via a sol-gel method. It is found that both the porosity (2.92 ∼ 33.03%) and the surface roughness (0.22 ∼ 0.43 nm for arithmetic mean roughness and 0.28 ∼ 0.58 nm for root mean square roughness) of the films increase monotonically as increasing F38 ratio from 5 to 25 wt%, accompanied by distinct changes of pore morphology from isolated mesopores with pore sizes of 5 ∼ 7 nm to longer worm-like pores (30 ∼ 100 nm in length). The apparent static contact angle ( θ *) of the films with isolated mesopores is enhanced from ca. 90.6° to 100.1° as indicated by an increase of the roughness factor with incresing F38 from 5 to 15 wt%, which is in qualitative agreement with the Wenzel’s equation. Interestingly, the films with interconnected worm-like pores show obvious hydrophilicity ( θ * = 80.7°) with further increasing F38 ratio higher than 20 wt%. The reversed surface wettability show that not only surface roughness but also pore morphology could significantly affect the wettability of the mesoporous TiO _2 films.https://doi.org/10.1088/2053-1591/abc770titania filmpore morphologysurface structurewettability |
| spellingShingle | Bangyun Xiong Jingjing Li Chunqing He Xiuqin Tang Zizhao Lv Xiaofeng Li Xiqiang Yan Effect of pore morphology and surface roughness on wettability of porous titania films Materials Research Express titania film pore morphology surface structure wettability |
| title | Effect of pore morphology and surface roughness on wettability of porous titania films |
| title_full | Effect of pore morphology and surface roughness on wettability of porous titania films |
| title_fullStr | Effect of pore morphology and surface roughness on wettability of porous titania films |
| title_full_unstemmed | Effect of pore morphology and surface roughness on wettability of porous titania films |
| title_short | Effect of pore morphology and surface roughness on wettability of porous titania films |
| title_sort | effect of pore morphology and surface roughness on wettability of porous titania films |
| topic | titania film pore morphology surface structure wettability |
| url | https://doi.org/10.1088/2053-1591/abc770 |
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