Erratum: Breakdown in the Wetting Transparency of Graphene [Phys. Rev. Lett.<b>109</b>, 176101 (2012)]

Shih, Chih‐Jen; Wang, Qinghua; Lin, Shangchao; Park, Kyoo Chul; Jin, Zhong; Strano, Michael S.; Blankschtein, Daniel

doi:10.1103/physrevlett.115.049901

Cited by 49 publications

(93 citation statements)

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“…Some groups found an impact on the wetting properties of water depending on the substrate and the Gr layer number as a result of wetting transparency [10][11][12]. Other researchers deduced, based on a thermodynamic model and molecular dynamics simulations, decreasing water contact angles for the first 3 layers of unsupported Gr [13].…”

Section: Resultsmentioning

confidence: 99%

“…Researchers and engineers try to exploit these extraordinary properties for pushing forward the basic understanding of transport phenomena like quantum hall effect [4,5] and Klein tunneling [6] on the one hand, and relevant technological applications like high frequency transistors [7] or transparent electrodes [8] and pressure sensors [9] on the other hand. Recently, Gr has also been investigated towards the possibility to create surfaces with tunable wettability [10][11][12]. Contradictory results and interpretations of the findings triggered a discussion about Gr thickness dependent wetting properties of water [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Layer Dependent Wetting in Parahexaphenyl Thin Film Growth on Graphene

Kratzer

Klima

Teichert

et al. 2014

e-J. Surf. Sci. Nanotech.

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In order to exploit graphene (Gr) as a transparent electrode in organic optoelectronics, a profound understanding of molecular wetting and diffusion processes on this material is essential. Properties of Gr like band structure, work function, or elasticity depend significantly on the layer number. Here, we report on Gr layer dependent differences in the growth morphologies of hot wall epitaxy deposited sub-monolayer thin films of the one-dimensional conjugated parahexaphenyl (6P) molecule on exfoliated Gr/SiO2. At deposition temperatures around 363 K, 6P forms straight needles arranged in regular networks on single layer graphene. Within the first four Gr layers, the average needle height increases and the average needle length decreases thereby reducing the specific 6P-Gr interface area. The variations in morphology and wetting behavior with the Gr layer number arise from changes in the growth kinetics induced by differences in adhesion and diffusion properties with Gr thickness.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Layer Dependent Wetting in Parahexaphenyl Thin Film Growth on Graphene

Kratzer

Klima

Teichert

et al. 2014

e-J. Surf. Sci. Nanotech.

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“…However, a controversial scenario emerges from these studies, which can be summarized with the following question: "Is a monolayer of graphene transparent to water-substrate interactions or not?" A further model was proposed by Shih et al 23 suggesting that graphene wetting transparency depends on the wettability of the substrate. up to 5 nm) van der Waals (vdW) forces, whereas the transparency is lost, if the substrate forms short-range chemical bonds (i.e.…”

Section: Introductionmentioning

confidence: 95%

Elucidation of the wettability of graphene through a multi-length-scale investigation approach

Amadei

Lai²,

Esplandiu

et al. 2015

RSC Adv.

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Univocal conclusions around the wettability of graphene exposed to environmental conditions remain elusive despite the recent efforts of several research groups. The main discrepancy rests on the question of whether a graphene monolayer (GML) is transparent or not to water and more generally what the role is that the substrate plays in determining the degree of wetting of the GML. In this work, we investigate the water transparency of GML by means of a multi-length-scale approach. We complement traditional static contact angle measurements and environmental scanning electron microscopy experiments with atomic force microscopy based force spectroscopy to assess the role that intermolecular interactions play in determining the wetting of GML. To gain deeper insight into the wetting transparency issue, we perform experiments on inert metals, such as gold and platinum, covered or not covered by GML. The comparison of the results obtained for different systems (i.e. GML covered and uncovered inert metals), provides unambiguous evidence that supports the non-wetting transparency theory of GML. This work aims to assist the development of technologies based on graphene-water interaction, such as graphitic membranes for water separation processes. Fig. 5 Tip/surface dissipative interactions by means of AFM. (a) Dissipative interactions according to Cleveland's equation. 41 Energy dissipation for GML on metal substrate and bare metal. Data on the left hand side and right hand side refer to Pt system and Au system respectively. (b) Normalized energy dissipation profile of Pt system. Black line represents for bare Pt and gray line represents for GML/Pt. Red circles represent inflection points related to the presence of capillary phenomena.This journal is

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“…Refs. [18,19]). Molecular simulations, and especially force field molecular dynamics, have proved extremely useful in investigating structural and dynamical properties of confined liquids elucidating molecular level information that is challenging for experiments to obtain.…”

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confidence: 99%

Friction of Water on Graphene and Hexagonal Boron Nitride from Ab Initio Methods: Very Different Slippage Despite Very Similar Interface Structures

2014

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Friction is one of the main sources of dissipation at liquid water/solid interfaces. Despite recent progress, a detailed understanding of water/solid friction in connection with the structure and energetics of the solid surface is lacking. Here we show for the first time that ab initio molecular dynamics can be used to unravel the connection between the structure of nanoscale water and friction for liquid water in contact with graphene and with hexagonal boron nitride. We find that whilst the interface presents a very similar structure between the two sheets, the friction coefficient on boron nitride is ≈ 3 times larger than that on graphene. This comes about because of the greater corrugation of the energy landscape on boron nitride arising from specific electronic structure effects. We discuss how a subtle dependence of the friction on the atomistic details of a surface, that is not related to its wetting properties, may have a significant impact on the transport of water at the nanoscale, with implications for the development of membranes for desalination and for osmotic power harvesting.Nanofluidics is an exciting field that offers alternative and sustainable solutions to problems relating to energy conversion, water filtration and desalination [1][2][3][4][5][6][7][8][9]. Miniaturization towards nanofluidic devices inevitably leads to an enhanced influence of surface and interface properties as opposed to those of the bulk. Friction is the most important interface property that limits fluid transport at the nanoscale, and its understanding is therefore crucial for the design of more efficient membranes, nanotubes and pores that exhibit low liquid/solid friction. The behavior of liquid flow at scales on the order of a few tens of nanometres departs from continuum fluid dynamics and desirable transport properties emerge at such small scales [10]. For instance, carbon nanotubes have a very high water permeability as compared to the prediction of macroscopic fluid dynamics [2]. Further, a vanishing friction has been found, giving rise to superlubric behavior of water chains inside tubes of sub-nanometre radii [11].Besides carbon, boron nitride (BN) nanostructures have recently been explored for the development of nanofluidic devices for fast water transport and efficient power generation [1,12,13]. Recent interest has been fueled by the demonstration that salinity concentration gradients across BN nanotube membranes can leed to the generation of very large electric currents [1]. It has also very recently been shown that there is a very large interlayer friction between in multiwalled BN nanotubes [14], as opposed to the superlubric behavior of the (homopolar) carbon nanotubes [15]. This suggests that the frictional properties of BN and C nanostructures might be quite different. However, to the best of our knowledge there has been no attempt to measure or compute the friction of water at the interface with BN sheets or nanotubes. Given that ab initio results have shown very similar contact angles of water drople...

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Erratum: Breakdown in the Wetting Transparency of Graphene [Phys. Rev. Lett.109, 176101 (2012)]

Cited by 49 publications

References 0 publications

Layer Dependent Wetting in Parahexaphenyl Thin Film Growth on Graphene

Layer Dependent Wetting in Parahexaphenyl Thin Film Growth on Graphene

Elucidation of the wettability of graphene through a multi-length-scale investigation approach

Friction of Water on Graphene and Hexagonal Boron Nitride from Ab Initio Methods: Very Different Slippage Despite Very Similar Interface Structures

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