Contact angle and sessile drop diameter hysteresis on metal surfaces

Gajewski, Andrzej

doi:10.1016/j.ijheatmasstransfer.2008.01.027

Cited by 35 publications

(21 citation statements)

References 12 publications

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“…All authors observe contact angle behaviour depending on the thermal properties and surface roughness of the substrate. Gajewski (2008) evidence the hysteresis effect on the sessile drops contact angles with increasing drop diameters and decreasing diameters even on metallic surfaces. They evidence that aluminum and stainless steel loose their hydrophobic properties during the drop diameter increase or decrease procedure while they do not observe this behaviour with copper and brass.…”

Section: Introductionmentioning

confidence: 65%

Sessile Drop in Microgravity: Creation, Contact Angle and Interface

Brutin

Zhu

Rahli

et al. 2009

Microgravity Sci. Technol.

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We present in this paper the results obtained from a parabolic flight campaign regarding the contact angle and the drop interface behavior of sessile drops created under terrestrial gravity (1g) or in microgravity (μg). This is a preliminary study before further investigations on sessile drops evaporation under microgravity. In this study, drops are created by the mean of a syringe pump by injection through the substrate. The created drops are recorded using a video camera to extract the drops contact angles. Three fluids have been used in this study : de-ionized water, HFE-7100 and FC-72 and two heating surfaces: aluminum and PTFE. The results obtained evidence the feasibility of sessile drop creation in microgravity even for low surface tension liquids (below 15 mN m −1 ) such as FC-72 and HFE-7100. We also evidence the contact angle behavior depending of the drop diameter and the gravity level. A second objective of this study is to analyze the drop interface shape in microgravity. The goal of the these experiments is to obtain reference data on the sessile drop behavior in microgravity for future experiments to be performed in an French-Chinese scientific instrument (IMPACHT).

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Section: Introductionmentioning

confidence: 65%

Sessile Drop in Microgravity: Creation, Contact Angle and Interface

Brutin

Zhu

Rahli

et al. 2009

Microgravity Sci. Technol.

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“…The Moistsense measurements had a linear correlation to the corneometer readings. Such that a dry skin corneometer measurement (20) correlated to a moistsense reading of 19; a normal skin corneometer reading (55) correlated to a moistsense reading of 49 and a moist skin corneometer reading (85) correlated to a moistsense reading of 70.…”

Section: Moisture Surveysmentioning

confidence: 99%

“…Work by [20] examining water contact angles across a range of materials has shown that Brass is more wettable (hydrophilic) than Steel. Both are more hydrophilic than Polypropelene and this may explain why Steel has the lowest friction coefficient in this study, following the argument of Adams et al [14].…”

Section: Materials Effectsmentioning

confidence: 99%

Understanding the Friction Mechanisms Between the Human Finger and Flat Contacting Surfaces in Moist Conditions

et al. 2010

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Human hands sweat in different circumstances and the presence of sweat can alter the friction between the hand and contacting surface. It is therefore important to understand how hand moisture varies between people, during different activities and the effect of this on friction.In this study a survey of fingertip moisture was done. Friction tests were then carried out to investigate the effect of moisture.Moisture was added to the surface of the finger, the finger was soaked in water, and water was added to the counter-surface; the friction of the contact was then measured. It was found that the friction increased, up until a certain level of moisture and then decreased. The increase in friction has previously been explained by viscous shearing, water absorption and capillary adhesion. The results from the experiments enabled the mechanisms to be investigated analytically. This study found that water absorption is the principle mechanism responsible for the increase in friction, followed by capillary adhesion, although it was not conclusively proved that this contributes significantly. Both these mechanisms increase friction by increasing the area of contact and therefore adhesion. Viscous shearing in the liquid bridges has negligible effect. There are, however, many limitations in the modelling that need further exploration.

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“…The origin of the self-cleaning property of lotus leaves has been revealed to be a cooperative effect of micro-and nano-scale structures on their surfaces [5]. Cheng and his colleagues [6] emphasized the importance of the lotus leaf's nanoscale hair-like structure on its self-cleaning ability. Barthlott et al assumed that 'Lotus effect' can be transferred to artifi cial surfaces (e.g.…”

Section: Hydrophobic Surfacesmentioning

confidence: 99%

“…The prospect of producing surfaces that repel water suggests huge opportunities in the area of corrosion inhibition for metal components, chemical and biological agent protection for clothing, antifouling for marine vehicles, among many other applications [6]. Generally, metals are hydrophilic or wettable.…”

Section: Hydrophobicity Of Metalsmentioning

confidence: 99%

Friction, wear and corrosion: learning from nature

Stoilov¹,

Northwood²

2014

Int. J. DNE

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Friction, wear and corrosion play a central role in diverse systems and phenomena that at fi rst sight may seem unrelated. On closer scrutiny, however, bio-system phenomena such as the lotus leaf effect (hydrophobicity) and surface passivation are found to display common features that are shared by many tribological processes in technological (manufacturing and automotive) and geological (drilling and mining) applications. Through the process of natural selection, nature has produced surface textures and water-based lubricant systems that far outclass the best oil-based lubricants of most man-made devices. To emulate these systems is one of today's great challenges.

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Contact angle and sessile drop diameter hysteresis on metal surfaces

Cited by 35 publications

References 12 publications

Sessile Drop in Microgravity: Creation, Contact Angle and Interface

Sessile Drop in Microgravity: Creation, Contact Angle and Interface

Understanding the Friction Mechanisms Between the Human Finger and Flat Contacting Surfaces in Moist Conditions

Friction, wear and corrosion: learning from nature

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