Contact angle measurement of free-standing square-millimeter single-layer graphene

Prydatko, Anna V.; Belyaeva, L. A.; Jiang, Lin; Lima, Lia M. C.; Schneider, Grégory F.

doi:10.1038/s41467-018-06608-0

Cited by 126 publications

(107 citation statements)

References 59 publications

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“…The wettability of the carbon nanotube surface is a very important property that is influenced by both chemical composition and geometrical microstructure of the contact surface. In our work, drops of water were applied on the various spots of MWCNTs to measure their contact angles using a sessile drop technique [24]. (Figure 5b).…”

Section: Wettability Of Va-mwcntsmentioning

confidence: 99%

Functionalized, Vertically Super-Aligned Multiwalled Carbon Nanotubes for Potential Biomedical Applications

Komane

Kumar

Choonara

et al. 2020

IJMS

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Currently, there is a lack of ultrasensitive diagnostic tool to detect some diseases such as ischemic stroke, thereby impacting effective and efficient intervention for such diseases at an embryonic stage. In addition to the lack of proper detection of the neurological diseases, there is also a challenge in the treatment of these diseases. Carbon nanotubes have a potential to be employed in solving the theragnostic challenges in those diseases. In this study, carbon nanotubes were successfully synthesized for potential application in the detection and treatment of the neurological diseases such as ischemic stroke. Vertically aligned multiwalled carbon nanotubes (VA-MWCNTs) were purified with HCl, carboxylated with H2SO4:HNO3 (3:1) and acylated with SOCl2 for use in potential targeting studies and for the design of a carbon-based electrode for possible application in the diagnosis of neurological diseases, including ischemic stroke. MWCNTs were washed, extracted from the filter membranes and dried in a vacuum oven at 60 °C for 24 h prior to functionalization and PEGylation. CNTs were characterized by SEM, TEM, OCA, DLS, CV and EIS. The HCl-treated CNT obtained showed an internal diameter, outer diameter and thickness of 8 nm, 34 nm and 75 µm, while these parameters for the H2SO4-HNO3-treated CNT were 8 nm, 23 nm and 41µm, respectively. PEGylated CNT demonstrated zeta potential, polydispersive index and particle size distribution of 6 mV, 0.41 and 98 nm, respectively. VA-MWCNTs from quartz tube were successfully purified, carboxylated, acylated and PEGylated for potential functionalization for use in targeting studies. For designing the carbon-based electrode, VA-MWCNTs on silicon wafer were successfully incorporated into epoxy resin for diagnostic applications. Functionalized MWCNTs were nontoxic towards PC-12 neuronal cells. In conclusion, vertically super-aligned MWCNTs have been successfully synthesized and functionalized for possible theragnostic biomedical applications in neurological disorders such as ischemic stroke.

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Section: Wettability Of Va-mwcntsmentioning

confidence: 99%

Functionalized, Vertically Super-Aligned Multiwalled Carbon Nanotubes for Potential Biomedical Applications

Komane

Kumar

Choonara

et al. 2020

IJMS

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“…However, the measurements of the contact angle are impacted by the nature of the solid surface (roughness and/or chemical heterogeneities, liquid penetration, surface deformation) and the experimental conditions (contamination of the solid substrate by adsorption of hydrocarbons). These experimental difficulties led to scattered values [17][18][19][20][21] of contact angle ranging from 42 to 125 o giving either a hydrophobic 18,[22][23][24] or hydrophilic 19,20,25 property to the graphene.…”

Section: Introductionmentioning

confidence: 99%

Associated molecular liquids at the graphene monolayer interface

Goujon

Ghoufi

Malfreyt

2021

The Journal of Chemical Physics

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We report molecular simulations of the interaction between a graphene sheet and different liquids such as water, ethanol and ethylene glycol. We describe the structural arrangements at the graphene interface in terms of density profiles, number of hydrogen bonds (HBs) and local structuration in neighboring layers close to the surface. We establish the formation of a two-dimensional HB network in the layer closest to the graphene. We also calculate the interfacial tension of liquids with a graphene monolayer and its profile along the direction normal to the graphene to rationalize and quantify the strengthening of the intermolecular interactions in the liquid due to the presence of the surface.

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“…Recently, inspirited by the growing application of membrane materials with adhesive contact to solids or liquids at small scales, numerous research works have been devoted to the study of adhesion mechanics of membrane materials (such as bio-membranes and graphene sheets) with small-sized solid particles [1][2][3][4][5][6][7][8][9][10][11][12][13][14] or liquid droplets [15][16][17][18][19]. It was soon recognized that the well-known classical models, such as the Johnson-Kendall-Roberts (JKR) model [20,21] developed for adhesion mechanics between two elastic bodies, and the Young's equation or Neumann equation [22,23] developed for liquid-solid or liquidliquid adhesion, cannot be directly applied to the adhesion mechanics of membrane material with solid particles or liquid droplets.…”

Section: Introductionmentioning

confidence: 99%

Adhesion of an elastic sphere on a tensioned membrane

2020

Mathematics and Mechanics of Solids

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Inspirited by the fact that classical models of adhesion contact (such as the Johnson–Kendall–Roberts model, Young’s equation or the Neumann equation) cannot be directly applied to adhesion of an elastic sphere on a membrane, the present work aims to develop an explicit general model for axisymmetric adhesion mechanics of an elastic sphere on a tensioned circular membrane. An explicit expression for the potential energy of the sphere–membrane system is derived, and explicit equations are given to determine the adhesion equilibrium state. The validity and accuracy of the proposed model are verified by good agreement between the predicted results and known results on both adhesion of a rigid sphere on a membrane and the critical condition for full wrapping of a rigid sphere by a membrane of non-zero bending rigidity.

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Contact angle measurement of free-standing square-millimeter single-layer graphene

Cited by 126 publications

References 59 publications

Functionalized, Vertically Super-Aligned Multiwalled Carbon Nanotubes for Potential Biomedical Applications

Functionalized, Vertically Super-Aligned Multiwalled Carbon Nanotubes for Potential Biomedical Applications

Associated molecular liquids at the graphene monolayer interface

Adhesion of an elastic sphere on a tensioned membrane

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