Evaporation of droplets on strongly and weakly pinning surfaces and dynamics of the triple line

Bormashenko, Edward; Musin, Albina; Zinigrad, Michael

doi:10.1016/j.colsurfa.2011.06.016

Cited by 124 publications

(101 citation statements)

References 47 publications

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“…The influence of surface features, morphology and surface energy on substrate wettability, contact line dynamics and droplet evaporation has been studied extensively [13,14,[29][30][31][32]. Microstructured substrates are commonly modeled after the lotus leaf effect, where a change in philicity/phobicity are explained by the classic Wenzel and Cassie models [33].…”

Section: Introductionmentioning

confidence: 99%

“…In such technologies, the evaporation rate is a key contributor to the overall system efficiency -as it dictates the droplet lifetime and corresponding rates of heat and mass transfer. With this said, a droplet's evaporation rate ( _ m LG ) is commonly correlated with several interdependent factors/parameters, including contact line dynamics/motion [7,[13][14][15][16]; substrate surface structure [17], energy [18], and thermal conductivity [19]; vapor/gas concentration and convection [20,21]; and the thermofluid properties of the evaporating fluid itself [22]. Thus, from an overarching perspective, droplet evaporation can be considered a relatively complex phenomena.…”

Section: Introductionmentioning

confidence: 99%

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Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Gleason

Voota

2016

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Gleason

Voota

2016

International Journal of Heat and Mass Transfer

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“…The appearance of CAH would affect the evaporation mode of the droplet. Large CAH leads to a constant contact area of the droplet until the receding angle is reached [17,18]. This phenomenon is associated with the "coffee ring effect" [19].…”

Section: Introductionmentioning

confidence: 99%

Contact angle hysteresis at the nanoscale: a molecular dynamics simulation study

Wang

Zhao

2012

Colloid Polym Sci

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In this paper, the contact angle hysteresis (CAH) of nanodroplets on both rigid and flexible substrates with different wettabilities was studied using molecular dynamics (MD) simulations. The critical shear stress (CSS) that determines the motion of the contact line (CL) was investigated. A theoretical correlation between CAH and CSS was proposed. Both CAH and CSS reflect the energy dissipation at the CL of the droplet in response to the exerted force. MD results of CAH are qualitatively consistent with the theoretical model. Simulation results also show that, for the same liquid-solid interactions, CAH on the flexible substrate is larger than that on the rigid substrate. These findings aim to enhance our understanding of the mechanism of the CAH at the nanoscale.

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“…This behavior is similar to that described by Bormashenko et al (2011) in their investigation of contact angle observed on low-energy polymeric substrates, where an initial step with pinning of the triple-line is observed, followed by steady or irregular stick-slip behavior with decreasing contact radius and fluctuation of the contact angle above and below a certain value for at least part of the range of contact radius variation.…”

Section: Contact Anglesupporting

confidence: 66%

Investigation of the surface species formed on enargite in electrochemically controlled oxidising environments and in the presence of flotation collectors

Plackowski¹

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Arsenic sulphides such as enargite and tennantite can represent significant penalty elements in base metals production. There are significant economic advantages to achieving a separation of arsenic bearing minerals at an early stage in processing, but to date no feasible widely applicable commercial method of flotation separation has been developed. A review of the existing literature on the selective flotation of enargite considered its surface properties and floatability. Special consideration was given to the various approaches in the study of enargite surface chemistry, and the implications for the flotation of enargite. Developments in these approaches were critically reviewed and discussed.The surface oxidation and hydrophobicity of natural enargite (Cu3AsS4) and the formation of oxidation species at the mineral surface were examined by a novel experimental approach that combines electrochemical techniques and atomic force microscopy (AFM). Combined with ex situ cryo X-ray photoelectron spectroscopy (XPS), the surface speciation of oxidised enargite was obtained, and compared with the newly fractured natural enargite surface.At pH 4, surface layer formations consisting of metal-deficient sulphide and elemental sulphur were identified, associated with a limited increase in root-mean-square (rms) roughness (1.228 to 3.143 nm) and an apparent heterogeneous distribution of surface products as demonstrated by AFM imaging. A mechanism of initial rapid dissolution of Cu followed by diffusion-limited surface layer deposition was identified.At pH 10, a similar mechanism was identified although the differences between the initial and diffusion-limited phases were less definitive. Surface species were identified as copper sulphate and hydroxide. A significant increase in surface rms roughness was found (0.795 to 9.723 nm). Dynamic (receding) contact angle measurements obtained by a droplet evaporation method found no significant difference between the oxidised surface and a freshly polished surface. A significant difference was found between the polished surface and that oxidized at pH 4, with an increase in contact angle of about 13° (46° to 59°) after oxidation. Competing effects of hydrophilic and hydrophobic species on the mineral surface under oxidizing conditions at pH 4 and the change in surface roughness at pH 10 may contribute to the observed effects of electrochemically controlled oxidation on enargite hydrophobicity.The effects of X-ray radiation on the surface after electrochemical oxidation were investigated using XPS. Surface species present on unoxidized enargite were compared with those present after oxidation at pH 10, and the effects of X-ray irradiation time as a ii function of temperature were studied. XPS spectra characteristic of a copper (II) hydroxide surface layer reduced in intensity with increasing X-ray exposure time. Associated changes in the relative concentrations of surface oxygen species were also observed.Temperature was shown to significantly influence the rate of change. A...

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Evaporation of droplets on strongly and weakly pinning surfaces and dynamics of the triple line

Cited by 124 publications

References 47 publications

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Contact angle hysteresis at the nanoscale: a molecular dynamics simulation study

Investigation of the surface species formed on enargite in electrochemically controlled oxidising environments and in the presence of flotation collectors

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