Imaging the air-water interface: Characterising biomimetic and natural hydrophobic surfaces using in situ atomic force microscopy

Elbourne, Aaron; Dupont, Madeleine; Collett, Simon; Truong, Vi Khanh; Xu, Xiumei; Vrancken, Nandi; Baulin, Vladimir A.; Ivanova, Elena P.; Crawford, Russell J.

doi:10.1016/j.jcis.2018.10.059

Cited by 20 publications

(23 citation statements)

References 80 publications

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“…In addition to contact line scanning, the AFM has been demonstrated for direct imaging of the liquid–air interfacial structure (Figure b) . Moosmann et al utilized the AFM to probe the shape of the liquid–air interface of a submerged superhydrophobic surface with air‐retaining pillar structures .…”

Section: Definition Of Surface Wettability: Beyond General Classificamentioning

confidence: 99%

Assessment and Interpretation of Surface Wettability Based on Sessile Droplet Contact Angle Measurement: Challenges and Opportunities

Kung

Sow

Zahiri

et al. 2019

Adv Materials Inter

121

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www.advmatinterfaces.de the sessile CA remains the favored method for quantifying wettability, mostly due to its conceptual and measurement simplicity. [9,31] However, the classification on the basis of the cut-off CA of 90° has attracted criticism. [32,33] The simplistic evaluation criteria of relative wettability are becoming inadequate in satisfying the needs of superwettability studies to classify different wetting phenomena. [34] Several works have questioned the accuracy of the sessile-droplet measurement as the CA value approaches the limits of 0° or 180°. [35,36] Yet, evaluation of surfaces in the superhydrophobic (CA > 150°) and superhydrophilic (CA < 10°) regimes is central in the development of enhanced wettabilities. Moreover, the interpretation of the CA results is often complicated by several factors, including surface smoothness, heterogeneity and cleanliness. [37] The Chun Haow Kung obtained his B.A.Sc. and M.A.Sc. in Chemical Engineering at the University of British Columbia (UBC). His graduate work with Prof. Mérida's group at UBC focused on the development and application of novel wetting characterization techniques, smart stimuli-responsive materials as well as electrochemical and hydrogen energy systems. He is currently a Research Scientist at Ballard Power Systems Inc. where he continues to pursue his interest in the polymer electrolyte membrane (PEM) fuel cell technology. Beniamin Zahiri is currently a researcher in the University of Illinois at Urbana-Champaign

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Section: Definition Of Surface Wettability: Beyond General Classificamentioning

confidence: 99%

Assessment and Interpretation of Surface Wettability Based on Sessile Droplet Contact Angle Measurement: Challenges and Opportunities

Kung

Sow

Zahiri

et al. 2019

Adv Materials Inter

121

View full text Add to dashboard Cite

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“…Atomic force microscopy (AFM) has been reported for accurate examination of numerous surfaces, including delicate biological systems and liquid interfaces. 117 AFM relies upon nanoscaled probes that usually make contact with the analysis surface/interface, and owing to its high precision, it can provide information on nanostructured surfaces. 117 AFM has been utilized for examining air-water interfaces for surfaces submerged underwater by many researchers (Fig.…”

Section: Force Methodsmentioning

confidence: 99%

“…11a). Both tapping mode 117,118 and non-contact mode 119,120 were applied for this purpose. Moosmann et al reported the examination of a micro-structured epoxy surface, both in air and underwater, which enabled estimating the water penetration depth.…”

Section: Force Methodsmentioning

confidence: 99%

“…118 For the previous light-based techniques, the visualization was limited to micro-scale structures, as the resolution of optical microscopy hinders observing smaller features. 117 In contrast, AFM can be beneficial in getting details on the nano-scale, which Elbourne et al utilized to map the surface of a Si-nanopillar textured sample. 117 Fig.…”

Section: Force Methodsmentioning

confidence: 99%

“…117 In contrast, AFM can be beneficial in getting details on the nano-scale, which Elbourne et al utilized to map the surface of a Si-nanopillar textured sample. 117 Fig. 11b shows the cross-section height profile for the sample, which highlights two things: the ability to distinguish nanoscale features and the penetration depth of water into the surface.…”

Section: Force Methodsmentioning

confidence: 99%

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The challenges, achievements and applications of submersible superhydrophobic materials

et al. 2021

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Mapping the Three‐Dimensional Nanostructure of the Ionic Liquid–Solid Interface Using Atomic Force Microscopy and Molecular Dynamics Simulations

Elbourne

Dupont²,

Kariuki

et al. 2023

Adv Materials Inter

Self Cite

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an IL was a pure salt with melting point below 100 °C, [1][2][3][4][5][6][7][8] however, this definition has expanded in recent years to include ionic solvents which have salt concentrations substantially greater than conventional electrolytes. [9,10] ILs can be broadly characterized into sub-classes based on their chemical structure or synthesis procedure, such as protic [8,11] and aprotic ILs, [12,13] among other classes. [14][15][16] ILs can be tailored to be highly thermally or chemically stable, have large electrochemical windows and/or negligible-volatility. [6,8,11,[17][18][19] These properties have made them interesting solvent candidates for a range of applications, including organic reaction media, [20][21][22][23] lubrication, [24,25] electrodeposition, [26][27][28][29][30] materials extraction, [31][32][33][34] catalysis, [35][36][37] and materials chemistry. [38][39][40][41][42][43] ILs are often nanostructured on the molecular length scale, both in the bulk liquid [3,[44][45][46][47] and at an interface. [48][49][50][51][52][53][54][55][56] Bulk IL nanostructure has been studied using numerous scattering techniques [44,45,[57][58][59][60][61][62][63][64][65] (X-rays, neutron, etc.) and a variety of computational approaches. [66][67][68][69][70] Together, these studies have suggested that many ILs form a self-assembled, heterogeneous Ionic liquids (ILs) are a widely investigated class of solvents for scientific and industrial applications due to their desirable and "tunable" properties. The IL-solid interface is a complex entity, and despite intensive investigation, its true nature remains elusive. The understanding of the IL-solid interface has evolved over the last decade from a simple 1D double layer, to a 2D ordered interface, and finally a liquid-specific, complex 3D ordered liquid interface. However, most studies depend solely on one technique, which often only examine one aspect of the interfacial nanostructure. Here, a holistic study of the protic IL-solid interface is presented, which provides a more detailed picture of IL interfacial solvation. The 3D nanostructure of the ethylammonium nitrate (EAN)-mica interface is investigated using a combination of 1D, 2D, and 3D amplitude modulated-atomic force microscopy and molecular dynamics simulations. Importantly, it is found that the EAN-mica interface is more complex than previously reported, possessing surface-adsorbed, near-surface, surface-normal, and lateral heterogeneity, which propagates at relatively large distances from the solid substrate. The work presented in this study meaningfully enhances the understanding of the IL-solid interface.

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Imaging the air-water interface: Characterising biomimetic and natural hydrophobic surfaces using in situ atomic force microscopy

Cited by 20 publications

References 80 publications

Assessment and Interpretation of Surface Wettability Based on Sessile Droplet Contact Angle Measurement: Challenges and Opportunities

Assessment and Interpretation of Surface Wettability Based on Sessile Droplet Contact Angle Measurement: Challenges and Opportunities

The challenges, achievements and applications of submersible superhydrophobic materials

Mapping the Three‐Dimensional Nanostructure of the Ionic Liquid–Solid Interface Using Atomic Force Microscopy and Molecular Dynamics Simulations

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