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Measurement of contact angle under different gravity generated by a long-arm centrifuge

Published on Mar 5, 2020in Colloids and Surfaces A: Physicochemical and Engineering Aspects3.131
· DOI :10.1016/j.colsurfa.2019.124381
Yong-Ming Liu7
Estimated H-index: 7
(NPU: Northwestern Polytechnical University),
Zi-Qing Wu4
Estimated H-index: 4
(NPU: Northwestern Polytechnical University),
Da-Chuan Yin18
Estimated H-index: 18
(NPU: Northwestern Polytechnical University)
Abstract
Abstract The contact angle, as a vital measured parameter of wettability of a material surface, is pertinent to adhesion, nucleation, capillary phenomena, and liquid management in space. With the development of space exploration, the relationship between the contact angle and gravity has attracted increasing attention. In this study, we designed and manufactured a long-arm centrifuge (d =6 m) and a matched low-rate dynamic contact angle measurement system, which has the capacity to measure the advancing and receding contact angles of sessile drops under 1G-8G. The advancing and receding contact angles of water on smooth and rough surfaces were measured, and the results showed that 1) this apparatus is reliable for measuring the advancing and receding contact angles of sessile drops under 1G-8G, 2) the contact angle is not changed by gravity, while the measured apparent contact angles are changed by gravity owing to they are slope angles of liquid-vapor interface away from the solid surface due to limitation of the resolution of measurement system, and 3) wetting state of the rough surface can be changed by gravity.
  • References (52)
  • Citations (1)
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References52
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#1DrelichJaroslaw W (MTU: Michigan Technological University)H-Index: 1
#2BoinovichLudmila (RAS: Russian Academy of Sciences)H-Index: 1
Last. SiboniStefano (University of Trento)H-Index: 2
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The contact angle is one of the most sensitive experimental values describing a junction between three phases, being influenced by the composition and properties of contacting media as well as the ...
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#1Maja Vuckovac (Aalto University)H-Index: 3
#2Mika Latikka (Aalto University)H-Index: 5
Last. Robin H. A. Ras (Aalto University)H-Index: 35
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The most widely used method to quantify the wetting properties of surfaces is by measuring contact angles. Even though contact angle goniometry is a powerful technique for characterizing wetting properties, it is not accurate for very hydrophobic surfaces. As the technique relies on image processing, it has inherent errors due to optical limitations, especially near the three-phase contact line. This leads to uncertainties in the positioning of the baseline, which can cause large errors in the m...
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#1Inmaculada Ríos-López (A.U.Th.: Aristotle University of Thessaloniki)H-Index: 2
#2M. Petala (A.U.Th.: Aristotle University of Thessaloniki)H-Index: 13
Last. Thodoris D. Karapantsios (A.U.Th.: Aristotle University of Thessaloniki)H-Index: 25
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Abstract The majority of studies on forced wetting of sessile droplets refers to application of a steadily increasing normal or tangential force or to a specific combination of these forces arising from tilting the substrate. The above constitute well-defined test conditions but are not representative of what is encountered in most industrial applications. To approach realistic industrial conditions and so also expand existing wetting theories, an evaluation of droplet shape deformation under th...
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Abstract During the struvite (MgNH4PO4·6H2O) recovery from agricultural or industrial wastewater, the extensive existence of heavy metals would pose great threats to the planting and environment. This work revealed the association of kinds of heavy metals, as possible substances in the wastewater, with the struvite. The struvite has been synthesized in situ and employed to contact with both high and low concentration heavy metal (including Cu, Ni, Pb, Zn, Mn, Cr(III)) wastewater. The heavy metal...
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#1Jaroslaw Drelich (MTU: Michigan Technological University)H-Index: 40
Abstract A contact angle observed for a liquid-solid system is not necessarily a unique value and a few different contact angles need to be carefully considered in relation to liquid spreading, adhesion and phase separation. Despite the conceptual simplicity of the contact angle and over 200 years of investigation, interpretations of experimental contact angles remain controversial, and mistakes are quite common. Here, the physics behind equilibrium contact angles are restated and their misuse i...
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Normally, pendant drops adapt contact angles that are closer to 90° than their sessile analogues. This is due to the drop’s weight that pulls the pendant drop and straightens its contact angles. In this paper, we show a case in which the opposite happens: sessile drops that adapt contact angles that are closer to 90° than their pendant analogues. To achieve these peculiar states, one needs to increase the effective gravity on the drops and then relax it again to 1 g. Apparently, this and other p...
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#1Tommi Huhtamäki (Aalto University)H-Index: 4
#2Xuelin Tian (Aalto University)H-Index: 20
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Wetting, the process of water interacting with a surface, is critical in our everyday lives and in many biological and technological systems. The contact angle is the angle at the interface where water, air and solid meet, and its value is a measure of how likely the surface is to be wetted by the water. Low contact-angle values demonstrate a tendency of the water to spread and adhere to the surface, whereas high contact-angle values show the surface’s tendency to repel water. The most common me...
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#1Rafael Tadmor (BGU: Ben-Gurion University of the Negev)H-Index: 23
#2Sakshi B. Yadav (LU: Lamar University)H-Index: 3
Last. Maria Tadmor (LU: Lamar University)H-Index: 3
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It is shown that introducing gravity in the energy minimization of drops on surfaces results in different expressions when minimized with respect to volume or with respect to contact angle. This phenomenon correlates with the probability of drops to bounce on smooth surfaces on which they otherwise form a very small contact angle or wet them completely. Theoretically, none of the two minima is stable: the drop should oscillate from one minimum to the other as long as no other force or friction w...
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Abstract Solution of the Young-Laplace equation for fluid-fluid interface shapes is crucial in several applications related to colloids, capillarity, and surfaces. Despite significant progress in analysis and computation, the solution framework in literature is quite sparse with different norms for non-dimensionalisation and often limited to simplistic boundary conditions. These problems can be overcome and a unified solution framework can be developed if the relevant parameters are non-dimensio...
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