Cassie-State Wetting Investigated by Means of a Hole-to-Pillar Density Gradient

Spori, Doris M.; Drobek, Tanja; Zürcher, Stefan; Spencer, Nicholas D.

doi:10.1021/la904714c

Cited by 44 publications

(40 citation statements)

References 33 publications

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“…The maximum density of silane coverage could be readily achieved with each silane, according to previously published results [36,37,44,45,53,54]. Further confirmations concerning films structures and homogeneity of the coverage were obtained by XPS.…”

Section: Discussionsupporting

confidence: 82%

Effects of Tailored Surface Chemistry on Desorption Electrospray Ionization Mass Spectrometry: a Surface-Analytical Study by XPS and AFM

Penna

Careri

Spencer

et al. 2015

J. Am. Soc. Mass Spectrom.

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Abstract. Since it was proposed for the first time, desorption electrospray ionizationmass spectrometry (DESI-MS) has been evaluated for applicability in numerous areas. Elucidations of the ionization mechanisms and the subsequent formation of isolated gas-phase ions have been proposed so far. In this context, the role of both surface and pneumatic effects on ion-formation yield has recently been investigated. Nevertheless, the effect of the surface chemistry has not yet been completely understood. Functionalized glass surfaces have been prepared, in order to tailor surface performance for ion formation. Three substrates were functionalized by depositing three different silanes [3-mercaptopropyltriethoxysilane (MTES), octyltriethoxysilane (OTES), and 1H,1H,2H,2H-perfluorooctyltriethoxy-silane (FOTES)] from toluene solution onto standard glass slides. Surface characterization was carried out by contact-angle measurements, tapping-mode atomic force microscopy, and X-ray photoelectron spectroscopy. Morphologically homogeneous and thickness-controlled films in the nm range were obtained, with surface free energies lying between 15 and 70 mJ/m 2 . These results are discussed, together with those of DESI-MS on lowmolecular-weight compounds such as melamine, tetracycline, and lincomycin, also taking into account the effects of the sprayer potential and its correlation with surface wettability. The results demonstrate that ionformation efficiency is affected by surface wettability, and this was demonstrated operating above and below the onset of the electrospray.

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Section: Discussionsupporting

confidence: 82%

Effects of Tailored Surface Chemistry on Desorption Electrospray Ionization Mass Spectrometry: a Surface-Analytical Study by XPS and AFM

Penna

Careri

Spencer

et al. 2015

J. Am. Soc. Mass Spectrom.

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“…When the drop is small enough where gravity can be neglected and the Laplace pressure is constant between the front (of high curvature) and the rear (of smaller curvature), sagging of the droplet can be neglected and is assumed to be at, and then f SL + f LA ¼ 1. 53,54 Based on this assumption, eqn (3) reduces to: Thus only the Cassie-Baxter wetting theory can be used for explaining the wetting behaviour, which assumes water bridges the cavities on the surface. The fractions of solid-liquid contact can be calculated to be 0.03 and 0.01 for S-H-10 and S-H-15, respectively (eqn (4)).…”

Section: Wettability Propertiesmentioning

confidence: 99%

Wettability of hierarchically-textured ceramic coatings produced by suspension HVOF spraying

et al. 2015

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A novel but simple path for the preparation of superhydrophobic and superhydrophilic coatings has been demonstrated via a recently developed technology, namely suspension high velocity oxy-fuel spraying.Potential uses for robust superhydrophobic coatings include antifouling applications such as aeroplane wings, ship hulls, offshore wind turbine blades, or the above-deck structures on ice breaker vessels.Several fabrication techniques have been reported for preparing inorganic superhydrophobic surfaces, but existing coatings either lack the necessary robustness for engineering applications and/or their deposition methods are not suitable for industrial scale-up. In this work, the industrially established HVOF coating process was adapted to use a liquid suspension of commercially available nano-particles (titania-TiO 2 , and hexagonal boron nitride-h-BN) as feedstock to produce nanostructured suspension HVOF TiO 2 /h-BN coatings for the first time on stainless steel. Results indicate that agglomerates in the nano-feedstock can be dispersed by h-BN due to poor mutual wettability between h-BN and molten TiO 2 . It also inhibits the anatase-to-rutile transformation of TiO 2 during coating deposition by inhibiting sintering of TiO 2 in the HVOF flame. The resultant coating becomes superhydrophobic when the addition of h-BN reaches 10 wt% due to the presence of hierarchical nano-texture on the surface. The superhydrophobicity (contact angle of 163-170 ) is maintained over a long period of time (>13 months, test still ongoing) and remains stable after exposure to light and tape test. A potential route for industrial preparation of robust water-repellent coatings is therefore highlighted by the study.

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“…These factors include leaf surface composition, surface tension of the solution, environmental effects (such as weathering), adjuvant type, drop size, and others. [21][22][23][24][25][26] The physical picture is further complicated by wetting dynamics, which can play an important role during droplet-leaf impact with respect to splashing and run-off. This is also consistent with the results of wetting studies on a variety of highly structured synthetic surfaces.…”

Section: Introductionmentioning

confidence: 99%

Uptake of phosphorus from surfactant solutions by wheat leaves: spreading kinetics, wetted area, and drying time

et al. 2016

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The delivery and uptake of nutrients at the surface of plant leaves is an important physicochemical phenomenon that depends on leaf surface morphology and chemistry, fertilizer formulation chemistry (including adjuvant and associated surfactants), wetting dynamics, and many other physical, chemical and biological factors. In this study, the role of spreading dynamics in determining uptake of the macronutrient phosphorus from phosphoric acid fertilizer solution in combination with three different adjuvants was measured in the absence of droplet run-off and splashing. When run-off and splashing losses were zero, spreading and drying rates had a small to negligible effect on the uptake efficiency. The results suggest that uptake may be much less sensitive to the specific choice of adjuvant and long time-scale spreading behaviour than one might intuitively expect.

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Cassie-State Wetting Investigated by Means of a Hole-to-Pillar Density Gradient

Cited by 44 publications

References 33 publications

Effects of Tailored Surface Chemistry on Desorption Electrospray Ionization Mass Spectrometry: a Surface-Analytical Study by XPS and AFM

Effects of Tailored Surface Chemistry on Desorption Electrospray Ionization Mass Spectrometry: a Surface-Analytical Study by XPS and AFM

Wettability of hierarchically-textured ceramic coatings produced by suspension HVOF spraying

Uptake of phosphorus from surfactant solutions by wheat leaves: spreading kinetics, wetted area, and drying time

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