Indentation of graphene nano-bubbles

Faraji, Fahim; Neyts, Erik C.; Peeters, F. M.

doi:10.1039/d2nr01207c

Cited by 3 publications

(3 citation statements)

References 39 publications

(55 reference statements)

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“…9 This is another instance demonstrating the impact of confinement on material properties, a phenomenon we have previously explored in other examples. 26 One possible question is whether commensurability, which caused oscillating behavior in quantities like capillary pressure and shear stress at the wall, similarly influences the flow velocity. We believe it could be possible, as long as this influence is not dominated by the effects of spatial variations in viscosity (see Supporting Note 8).…”

Section: Of Ref 3)mentioning

confidence: 99%

“…Therefore, the anticipation is that γ oscillates due to confinement, despite the notion of surface tension as an intrinsic property of water valid down to the nanoscale . This is another instance demonstrating the impact of confinement on material properties, a phenomenon we have previously explored in other examples . One possible question is whether commensurability, which caused oscillating behavior in quantities like capillary pressure and shear stress at the wall, similarly influences the flow velocity.…”

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confidence: 97%

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Capillary Condensation of Water in Graphene Nanocapillaries

Faraji,

Neyts,

Milošević

et al. 2024

Nano Lett.

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Recent experiments have revealed that the macroscopic Kelvin equation remains surprisingly accurate even for nanoscale capillaries. This phenomenon was so far explained by the oscillatory behavior of the solid−liquid interfacial free energy. We here demonstrate thermodynamic and capillarity inconsistencies with this explanation. After revising the Kelvin equation, we ascribe its validity at nanoscale confinement to the effect of disjoining pressure. To substantiate our hypothesis, we employed molecular dynamics simulations to evaluate interfacial heat transfer and wetting properties. Our assessments unveil a breakdown in a previously established proportionality between the work of adhesion and the Kapitza conductance at capillary heights below 1.3 nm, where the dominance of the work of adhesion shifts primarily from energy to entropy. Alternatively, the peak density of the initial water layer can effectively probe the work of adhesion. Unlike under bulk conditions, high confinement renders the work of adhesion entropically unfavorable.

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Section: Of Ref 3)mentioning

confidence: 99%

mentioning

confidence: 97%

Capillary Condensation of Water in Graphene Nanocapillaries

Faraji,

Neyts,

Milošević

et al. 2024

Nano Lett.

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“…This additional equation is to describe the state of the gas inside the bubble. Several experiments have observed very high pressure for the gas in the graphene bubble, which is typically on the order of 1 GPa. , The gas pressure is so high that it may cause phase transition for the trapped substance, − or induce some high-pressure chemical reactions . It is thus important to investigate how to describe the gas inside the graphene bubble.…”

Section: Introductionmentioning

confidence: 99%

The Gas in Graphene Bubbles: An Improved van der Waals Equation Description

Wang

Jiang

2023

J. Phys. Chem. C

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An accurate description for the shape of the graphene bubbles is essential for research and application of these gas bubbles in tuning electronic, magnetic, and optical properties of the two-dimensional nano materials. The present work reveals that the structural parameters of the bubble can not be described by the theoretical model based on the ideal gas law, which underestimates the structure parameters by 48%. The invalidity of the ideal gas law is due to the extremely large pressure of the gas inside the bubble that can be as high as 1 gigapascal, far beyond the applicability condition of the ideal gas law. To capture this effect, we develop an improved van der Waals equation with the quadratic nonlinear term of the gas density, which is found to provide an accurate description for the shape of the bubble. Further molecular dynamics simulations show high coincidence with the above van der Waals equation model for both graphene bubbles and MoS 2 bubbles.

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Bubble-Induced Strong Thermal Contraction for Graphene

Qu,

Cui,

Jiang

2023

ASME Journal of Heat and Mass Transfer

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The thermal expansion coefficient (TEC) of van der Waals (vdW) layered structures is of crucial importance in governing the dependability and longevity of advanced optoelectronic equipment. Bubbles are commonly found within layered structures, yet their impact on the thermal expansion coefficient of the structure is still not well understood. We derive an analytical formula that describes the influence of bubbles on the variation in length, utilizing both the elastic membrane theory and the improved van der Waals gas state equation. The results demonstrate that as the temperature increases, bubbles can induce significant thermal contraction in few-layer graphene structures. The analytical predictions are validated through molecular dynamic (MD) simulations, confirming the accuracy and reliability of the proposed model. These findings hold significant value in enhancing our understanding of the dependability and durability of functional equipment that relies on van der Waals layered structures.

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Indentation of graphene nano-bubbles

Abstract: Molecular dynamics simulations are used to investigate the effect of an AFM tip when indenting graphene nano bubbles filled by a noble gas (i.e. He, Ne and Ar) up to...

Cited by 3 publications

References 39 publications

Capillary Condensation of Water in Graphene Nanocapillaries

Capillary Condensation of Water in Graphene Nanocapillaries

The Gas in Graphene Bubbles: An Improved van der Waals Equation Description

Bubble-Induced Strong Thermal Contraction for Graphene

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