Evaluation of the Molecular Conformation of Surface Alkyl Chains of Alkylsilane-Derived Hybrid Films Using Sum-Frequency Generation Spectroscopy
Alkylsilane-derived hybrid films exhibiting excellent dynamic dewetting behaviors toward various liquids are promising, since they are smooth, highly transparent, and a low environmental burden. However, the detailed mechanism of their unique dynamic dewetting behaviors and its relation to the surfa...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Solids |
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| Online Access: | https://www.mdpi.com/2673-6497/3/1/10 |
| _version_ | 1797442114489942016 |
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| author | Rika Mizuno Chihiro Urata Ken Watanabe Atsushi Hozumi Takayuki Miyamae |
| author_facet | Rika Mizuno Chihiro Urata Ken Watanabe Atsushi Hozumi Takayuki Miyamae |
| author_sort | Rika Mizuno |
| collection | DOAJ |
| description | Alkylsilane-derived hybrid films exhibiting excellent dynamic dewetting behaviors toward various liquids are promising, since they are smooth, highly transparent, and a low environmental burden. However, the detailed mechanism of their unique dynamic dewetting behaviors and its relation to the surface segregation of alkylsilanes during the film formation have not yet been clearly identified. In this study, we prepared various hybrid films by varying the mixing ratios of tetraethoxysilane (TEOS) and <i>n</i>-dodecyltriethoxysilane (C12TES) and investigated the changes in the s-CH<sub>2</sub>/s-CH<sub>3</sub> peak strength ratios of the resulting hybrid films under dry and wet conditions by sum-frequency generation (SFG) spectroscopy. When the static/dynamic water contact angles significantly changed, it was clearly observed that the s-CH<sub>2</sub>/s-CH<sub>3</sub> ratio of each hybrid film under dry and wet condition also changed markedly. With increasing TEOS concentration, the static contact angles became smaller, while the contact angle hysteresis tended to increase because of the increase in gauche defects at the air interface and hydrogen bonds. This finding suggests that the concentration and conformation of the alkyl chains derived from surface-segregated C12TES molecules play an important role in determining the final dewetting behaviors of the hybrid films to water. |
| first_indexed | 2024-03-09T12:37:08Z |
| format | Article |
| id | doaj.art-9fb437413d3f4ea9adc256ca05407591 |
| institution | Directory Open Access Journal |
| issn | 2673-6497 |
| language | English |
| last_indexed | 2024-03-09T12:37:08Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Solids |
| spelling | doaj.art-9fb437413d3f4ea9adc256ca054075912023-11-30T22:23:38ZengMDPI AGSolids2673-64972022-03-013114715410.3390/solids3010010Evaluation of the Molecular Conformation of Surface Alkyl Chains of Alkylsilane-Derived Hybrid Films Using Sum-Frequency Generation SpectroscopyRika Mizuno0Chihiro Urata1Ken Watanabe2Atsushi Hozumi3Takayuki Miyamae4Graduate School of Engineering, Chiba University, Chiba 263-8522, JapanInnovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, JapanInnovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, JapanInnovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, JapanGraduate School of Engineering, Chiba University, Chiba 263-8522, JapanAlkylsilane-derived hybrid films exhibiting excellent dynamic dewetting behaviors toward various liquids are promising, since they are smooth, highly transparent, and a low environmental burden. However, the detailed mechanism of their unique dynamic dewetting behaviors and its relation to the surface segregation of alkylsilanes during the film formation have not yet been clearly identified. In this study, we prepared various hybrid films by varying the mixing ratios of tetraethoxysilane (TEOS) and <i>n</i>-dodecyltriethoxysilane (C12TES) and investigated the changes in the s-CH<sub>2</sub>/s-CH<sub>3</sub> peak strength ratios of the resulting hybrid films under dry and wet conditions by sum-frequency generation (SFG) spectroscopy. When the static/dynamic water contact angles significantly changed, it was clearly observed that the s-CH<sub>2</sub>/s-CH<sub>3</sub> ratio of each hybrid film under dry and wet condition also changed markedly. With increasing TEOS concentration, the static contact angles became smaller, while the contact angle hysteresis tended to increase because of the increase in gauche defects at the air interface and hydrogen bonds. This finding suggests that the concentration and conformation of the alkyl chains derived from surface-segregated C12TES molecules play an important role in determining the final dewetting behaviors of the hybrid films to water.https://www.mdpi.com/2673-6497/3/1/10SFGliquid-repellent surfaceswater contact angledewetting |
| spellingShingle | Rika Mizuno Chihiro Urata Ken Watanabe Atsushi Hozumi Takayuki Miyamae Evaluation of the Molecular Conformation of Surface Alkyl Chains of Alkylsilane-Derived Hybrid Films Using Sum-Frequency Generation Spectroscopy Solids SFG liquid-repellent surfaces water contact angle dewetting |
| title | Evaluation of the Molecular Conformation of Surface Alkyl Chains of Alkylsilane-Derived Hybrid Films Using Sum-Frequency Generation Spectroscopy |
| title_full | Evaluation of the Molecular Conformation of Surface Alkyl Chains of Alkylsilane-Derived Hybrid Films Using Sum-Frequency Generation Spectroscopy |
| title_fullStr | Evaluation of the Molecular Conformation of Surface Alkyl Chains of Alkylsilane-Derived Hybrid Films Using Sum-Frequency Generation Spectroscopy |
| title_full_unstemmed | Evaluation of the Molecular Conformation of Surface Alkyl Chains of Alkylsilane-Derived Hybrid Films Using Sum-Frequency Generation Spectroscopy |
| title_short | Evaluation of the Molecular Conformation of Surface Alkyl Chains of Alkylsilane-Derived Hybrid Films Using Sum-Frequency Generation Spectroscopy |
| title_sort | evaluation of the molecular conformation of surface alkyl chains of alkylsilane derived hybrid films using sum frequency generation spectroscopy |
| topic | SFG liquid-repellent surfaces water contact angle dewetting |
| url | https://www.mdpi.com/2673-6497/3/1/10 |
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