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Wettability of partially suspended graphene.

ABSTRACT: The dependence of the wettability of graphene on the nature of the underlying substrate remains only partially understood. Here, we systematically investigate the role of liquid-substrate interactions on the wettability of graphene by varying the area fraction of suspended graphene from 0 to 95% by means of nanotextured substrates. We find that completely suspended graphene exhibits the highest water contact angle (85° ± 5°) compared to partially suspended or supported graphene, regardless of the hydrophobicity (hydrophilicity) of the substrate. Further, 80% of the long-range water-substrate interactions are screened by the graphene monolayer, the wettability of which is primarily determined by short-range graphene-liquid interactions. By its well-defined chemical and geometrical properties, supported graphene therefore provides a model system to elucidate the relative contribution of short and long range interactions to the macroscopic contact angle.

SUBMITTER: Ondarcuhu T

PROVIDER: S-EPMC4829856 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature

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Wettability of partially suspended graphene.

Ondarçuhu Thierry T Thomas Vincent V Nuñez Marc M Dujardin Erik E Rahman Atikur A Black Charles T CT Checco Antonio A

Scientific reports 20160413

The dependence of the wettability of graphene on the nature of the underlying substrate remains only partially understood. Here, we systematically investigate the role of liquid-substrate interactions on the wettability of graphene by varying the area fraction of suspended graphene from 0 to 95% by means of nanotextured substrates. We find that completely suspended graphene exhibits the highest water contact angle (85° ± 5°) compared to partially suspended or supported graphene, regardless of th ...[more]

PMID: 27072195

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