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Molecular-scale Hydrophilicity Induced by Solute: Molecular-thick Charged Pancakes of Aqueous Salt Solution on Hydrophobic Carbon-based Surfaces
Shi, GS; Shen, Y; Liu, J; Wang, CL; Wang, Y; Song, B; Hu, J; Fang, HP; fanghaiping@sinap.ac.cn
2014
Source PublicationSCIENTIFIC REPORTS
ISSN2045-2322
Volume4
AbstractWe directly observed molecular-thick aqueous salt-solution pancakes on a hydrophobic graphite surface under ambient conditions employing atomic force microscopy. This observation indicates the unexpected molecular-scale hydrophilicity of the salt solution on graphite surfaces, which is different from the macroscopic wetting property of a droplet standing on the graphite surface. Interestingly, the pancakes spontaneously displayed strong positively charged behavior. Theoretical studies showed that the formation of such positively charged pancakes is attributed to cation-pi interactions between Na+ ions in the aqueous solution and aromatic rings on the graphite surface, promoting the adsorption of water molecules together with cations onto the graphite surface; i.e., Na+ ions as a medium adsorbed to the graphite surface through cation-pi interactions on one side while at the same time bonding to water molecules through hydration interaction on the other side at a molecular scale. These findings suggest that actual interactions regarding carbon-based graphitic surfaces including those of graphene, carbon nanotubes, and biochar may be significantly different from existing theory and they provide new insight into the control of surface wettability, interactions and related physical, chemical and biological processes.
KeywordAnion-p Interactions Aromatic-hydrocarbons Graphene Oxide Driving-force Wetting Layer Water Nanotubes Dynamics Cation Films
Indexed BySCI
Language英语
WOS IDWOS:000343980500001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/14251
Collection中科院上海应用物理研究所2011-2019年
Corresponding Authorfanghaiping@sinap.ac.cn
Recommended Citation
GB/T 7714
Shi, GS,Shen, Y,Liu, J,et al. Molecular-scale Hydrophilicity Induced by Solute: Molecular-thick Charged Pancakes of Aqueous Salt Solution on Hydrophobic Carbon-based Surfaces[J]. SCIENTIFIC REPORTS,2014,4.
APA Shi, GS.,Shen, Y.,Liu, J.,Wang, CL.,Wang, Y.,...&fanghaiping@sinap.ac.cn.(2014).Molecular-scale Hydrophilicity Induced by Solute: Molecular-thick Charged Pancakes of Aqueous Salt Solution on Hydrophobic Carbon-based Surfaces.SCIENTIFIC REPORTS,4.
MLA Shi, GS,et al."Molecular-scale Hydrophilicity Induced by Solute: Molecular-thick Charged Pancakes of Aqueous Salt Solution on Hydrophobic Carbon-based Surfaces".SCIENTIFIC REPORTS 4(2014).
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