Wetting Transparency of Graphene: A macroscopic Window but Nanoscopic Mirror
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arXiv
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| Format: | Preprint |
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2025
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| author | Wang, Yongkang Litman, Yair Cho, Minhaeng Cox, Stephen Bonn, Mischa |
| author_facet | Wang, Yongkang Litman, Yair Cho, Minhaeng Cox, Stephen Bonn, Mischa |
| contents | Graphene supported on a substrate in contact with water underpins a wide range of processes and technologies, yet its wettability remains controversial. Understanding how substrate charges and graphene's properties influence water organization is crucial. Here, we combine heterodyne-detected sum-frequency generation (HD-SFG) spectroscopy with molecular dynamics simulations to investigate CaF$_2$-supported graphene interfaces in contact with water. We find that interfacial water orientation is primarily governed by the CaF$_2$ substrate's pH-dependent local electrostatics, confirming graphene's macroscopic wetting transparency. However, at the nanoscale, graphene's polarizability induces a local inversion of water's molecular orientation above substrate charges, revealing subtle structural ordering that is masked in spatially averaged measurements. These insights elucidate the molecular origins of graphene's wetting behavior and suggest new avenues to tailor interfacial phenomena in graphene-based nanofluidic, sensing, and energy applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_04930 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Wetting Transparency of Graphene: A macroscopic Window but Nanoscopic Mirror Wang, Yongkang Litman, Yair Cho, Minhaeng Cox, Stephen Bonn, Mischa Chemical Physics Graphene supported on a substrate in contact with water underpins a wide range of processes and technologies, yet its wettability remains controversial. Understanding how substrate charges and graphene's properties influence water organization is crucial. Here, we combine heterodyne-detected sum-frequency generation (HD-SFG) spectroscopy with molecular dynamics simulations to investigate CaF$_2$-supported graphene interfaces in contact with water. We find that interfacial water orientation is primarily governed by the CaF$_2$ substrate's pH-dependent local electrostatics, confirming graphene's macroscopic wetting transparency. However, at the nanoscale, graphene's polarizability induces a local inversion of water's molecular orientation above substrate charges, revealing subtle structural ordering that is masked in spatially averaged measurements. These insights elucidate the molecular origins of graphene's wetting behavior and suggest new avenues to tailor interfacial phenomena in graphene-based nanofluidic, sensing, and energy applications. |
| title | Wetting Transparency of Graphene: A macroscopic Window but Nanoscopic Mirror |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2511.04930 |