Measurement of contact angles in a simulated microgravity environment generated by a large gradient magnetic field

Liu, Yong-Ming; Chen, Ruiqing; Wu, Zi-Qing; Zhu, Jing; Shi, Jian-Yu; Lu, Hui‐Meng; Shang, Peng; Yin, Da‐Chuan

doi:10.1063/1.4963359

Cited by 8 publications

(8 citation statements)

References 53 publications

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“…The levitation in a SMF has been used to simulate wettability in microgravity. 29 The magnetic force F exerting on the droplet can be estimated using the expression…”

Section: Resultsmentioning

confidence: 99%

Reduced Wettability of Solids by a Liquid Ga–In–Sn Alloy in a Steady Magnetic Field

Cao

Lippmann

et al. 2018

J. Phys. Chem. C

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Wettability of solids by liquid metals plays an important role in numerous technological processes. In this work, the effect of a steady magnetic field (SMF) on the wettability of copper and silica substrates by a Ga−In−Sn liquid alloy was investigated using the sessile drop technique. It was found that the contact angles on both substrates increased with increasing SMF intensity. The reduced wettability can be attributed to a change in liquid surface tension under the action of an SMF. In combination with the equations of state, the increase of the contact angle with the SMF intensity is predicted, which is in reasonable agreement with experimental results.

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“…The levitation in a SMF has been used to simulate wettability in microgravity. 29 The magnetic force F exerting on the droplet can be estimated using the expression…”

Section: Resultsmentioning

confidence: 99%

Reduced Wettability of Solids by a Liquid Ga–In–Sn Alloy in a Steady Magnetic Field

Cao

Lippmann

et al. 2018

J. Phys. Chem. C

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“…Recently, Bormashenko imposing the transversality conditions on the variational problem of wetting also demonstrates that gravity does not influence equilibrium contact angles [35][36][37]. However, many experimental observations [15][16][17][18][19][20][21][22][23][24][25][26][27] under some gravities (≤2G) differed from these theoretical conclusions. This discrepancy becomes an important issue, especially in the space era, when interfacial phenomena frequently draw more attention because they are dominant events in microgravity and much different from those observed on Earth.…”

Section: Introductionmentioning

confidence: 99%

“…The contact angles on these low contact angle hysteresis surfaces are very close to Young's contact angle. Previous experimental studies [15][16][17][18][19][20][21][22][23][24][25][26][27]43] at different gravities used ordinary surfaces. Thus, the results of the effect of gravity on the contact angle may be caused by contact angle hysteresis.…”

Section: Introductionmentioning

confidence: 99%

The Possibility of Changing the Wettability of Material Surface by Adjusting Gravity

Liu

Bao

et al. 2020

Research

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The contact angle, as a vital measured parameter of wettability of material surface, has long been in dispute whether it is affected by gravity. Herein, we measured the advancing and receding contact angles on extremely low contact angle hysteresis surfaces under different gravities (1-8G) and found that both of them decrease with the increase of the gravity. The underlying mechanism is revealed to be the contact angle hysteresis and the deformation of the liquid-vapor interface away from the solid surface caused by gradient distribution of the hydrostatic pressure. The real contact angle is not affected by gravity and cannot measured by an optical method. The measured apparent contact angles are angles of inclination of the liquid-vapor interface away from the solid surface. Furthermore, a new equation is proposed based on the balance of forces acting on the three-phase contact region, which quantitatively reveals the relation of the apparent contact angle with the interfacial tensions and gravity. This finding can provide new horizons for solving the debate on whether gravity affects the contact angle and may be useful for the accurate measurement of the contact angle and the development of a new contact angle measurement system.

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“…However, the CA is only 136.4 and 129.9° tested with the same volume (5 μL) of liquid sulfur, which is much smaller than that of water. This phenomenon is caused by the fact that the density of sulfur, at 1.806 g/cm 3 , is almost twice that of water . With the decrease of sulfur droplet volume, the CA of liquid sulfur rapidly rises above 150° (Figure S3).…”

Section: Results and Discussionmentioning

confidence: 99%

“…This phenomenon is caused by the fact that the density of sulfur, at 1.806 g/cm 3 , is almost twice that of water. 26 With the decrease of sulfur droplet volume, the CA of liquid sulfur rapidly rises above 150°(Figure S3). When the volume is about 2.5 μL, the CA is 152.7 ± 2.5°and 151.3 ± 0.5°on P−Fe and F−Fe, respectively (Figure 2Ac,d).…”

Section: Resultsmentioning

confidence: 99%

Ultralow Adhesion and Phase Change Behaviors of Sulfur Droplets on the Superhydrophobic Surface and Its Application in the Granulation Process

Liu

Huang

et al. 2021

Langmuir

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Traditional sulfur granulation process is often accompanied by high dust and mechanical friction, which are dangerous and harmful to the environment. In this work, the application of the superhydrophobic surface to sulfur granulation is expected to solve the above problem. Two superhydrophobic metal sheets were prepared, and the rolling angles of the two samples are both less than 10°. The contact angles of liquid sulfur are 152.7 ± 0.5 and 151.3 ± 0.1°, respectively. The adhesion rates of both samples are less than 0.5 wt %. The solidifying process of a sulfur drop on the superhydrophobic surface was recorded and simulated, conforming that the substrate temperature has a great influence on the solidifying process. Based on the above findings, static granulation and rolling to granulation were proposed. The product obtained by the two methods has uniform particle size distribution and excellent compressive strength, showing a good industrial application prospect. This study provides a referral strategy for an economical and environmentally friendly sulfur granulation process.

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Measurement of contact angles in a simulated microgravity environment generated by a large gradient magnetic field

Cited by 8 publications

References 53 publications

Reduced Wettability of Solids by a Liquid Ga–In–Sn Alloy in a Steady Magnetic Field

Reduced Wettability of Solids by a Liquid Ga–In–Sn Alloy in a Steady Magnetic Field

The Possibility of Changing the Wettability of Material Surface by Adjusting Gravity

Ultralow Adhesion and Phase Change Behaviors of Sulfur Droplets on the Superhydrophobic Surface and Its Application in the Granulation Process

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