Contact angle hysteresis of liquid drops as means to measure adhesive energy of zein on solid substrates

Pramana ◽  
2006 ◽  
Vol 66 (3) ◽  
pp. 563-574 ◽  
Author(s):  
L. Muthuselvi ◽  
Aruna Dhathathreyan
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
Liquid Drops ◽  
Solid Substrates ◽  
Adhesive Energy

scholarly journals Nanoscale Soft Wetting Observed in Co/Sapphire during Pulsed Laser Irradiation

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 268
Author(s):  
Jung Won Choi ◽  
Daseul Ham ◽  
Seonghyun Han ◽  
Do Young Noh ◽  
Hyon Chol Kang
Keyword(s):  
Contact Angle ◽  
Sapphire Substrate ◽  
Pulsed Laser ◽  
Contact Angles ◽  
Metal Thin Films ◽  
Liquid Drops ◽  
Wetting Behavior ◽  
Solid Substrates ◽  
Co Nanoparticles ◽  
Amorphous Al2o3

Liquid drops on deformable soft substrates exhibit quite complicated wetting behavior as compared to those on rigid solid substrates. We report on a soft wetting behavior of Co nanoparticles (NPs) on a sapphire substrate during pulsed laser-induced dewetting (PLID). Co NPs produced by PLID wetted the sapphire substrate with a contact angle near 70°, which is in contrast to typical dewetting behavior of metal thin films exhibiting contact angles greater than 90°. In addition, a nanoscale γ-Al2O3 wetting ridge about 15 nm in size and a thin amorphous Al2O3 interlayer were observed around and beneath the Co NP, respectively. The observed soft wetting behavior strongly indicates that the sapphire substrate became soft and deformable during PLID. Moreover, the soft wetting was augmented under PLID in air due to the formation of a CoO shell, resulting in a smaller contact angle near 30°.

Motion of Newtonian drops deposited on liquid-impregnated surfaces induced by vertical vibrations

2019 ◽  
Vol 876 ◽  
Author(s):  
Paolo Sartori ◽  
Elia Guglielmin ◽  
Davide Ferraro ◽  
Daniele Filippi ◽  
Annamaria Zaltron ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Contact Angle ◽  
Fast Rate ◽  
Contact Angle Hysteresis ◽  
Solid Surfaces ◽  
Distilled Water ◽  
Liquid Drops ◽  
Dynamical Phase ◽  
Viscous Drops ◽  
Vertical Vibrations

We have studied the motion of drops on inclined liquid-impregnated surfaces (LISs) subject to vertical vibrations. The liquid drops comprise distilled water and different aqueous solutions of glycerol of increasing viscosity. The use of weak pinning LISs strongly affects the dynamical phase diagram. First of all, there is no trace of the dominant static region at low oscillating amplitudes reported for oscillating solid surfaces characterized by contact angle hysteresis. On the contrary, at sufficiently low oscillating amplitudes, the drops always move downwards with a velocity that depends only on the drop viscosity. Further increasing the oscillating amplitude may drive the drop upwards against gravity, as reported for dry surfaces. The use of more viscous drops widens this climbing region. Arguably, the main novelty of this work concerns the observation of two distinct descending regimes where the downhill speed differs by a factor of five or more. Fast-rate videos show that the evolution of the drop profile is diverse in the two regimes, likely because the vertical oscillations reduce the effect of the oil meniscus surrounding the drop at high accelerations.

A NEW APPROACH TO INVESTIGATE CONTACT ANGLE HYSTERESIS

2018 ◽  
Author(s):  
Qiao Liu ◽  
Abbasali Abouei Mehrizi ◽  
Hao Wang
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
New Approach

Drop impact on solids: contact-angle hysteresis filters impact energy into modal vibrations

2021 ◽  
Vol 923 ◽  
Author(s):  
Vanessa R. Kern ◽  
Joshua B. Bostwick ◽  
Paul H. Steen
Keyword(s):  
Contact Angle ◽  
Impact Energy ◽  
Contact Angle Hysteresis ◽  
Drop Impact

Abstract

scholarly journals An inversion of contact angle hysteresis when a liquid drop slides up on an inclined plane under the spark discharge action

2021 ◽  
Vol 33 (6) ◽  
pp. 061707
Author(s):  
Alexander E. Dubinov ◽  
Djamilya N. Iskhakova ◽  
Valeria A. Lyubimtseva
Keyword(s):  
Contact Angle ◽  
Liquid Drop ◽  
Contact Angle Hysteresis ◽  
Spark Discharge ◽  
Inclined Plane

scholarly journals Biomimetic Approach for the Elaboration of Highly Hydrophobic Surfaces: Study of the Links between Morphology and Wettability

Biomimetics ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 38
Author(s):  
Quentin Legrand ◽  
Stephane Benayoun ◽  
Stephane Valette
Keyword(s):  
Contact Angle ◽  
Ginkgo Biloba ◽  
Contact Angle Hysteresis ◽  
Contact Angles ◽  
Textured Surfaces ◽  
Replication Process ◽  
Wetting Behavior ◽  
Static Contact ◽  
Biomimetic Approach ◽  
Highly Hydrophobic

This investigation of morphology-wetting links was performed using a biomimetic approach. Three natural leaves’ surfaces were studied: two bamboo varieties and Ginkgo Biloba. Multiscale surface topographies were analyzed by SEM observations, FFT, and Gaussian filtering. A PDMS replicating protocol of natural surfaces was proposed in order to study the purely morphological contribution to wetting. High static contact angles, close to 135∘, were measured on PDMS replicated surfaces. Compared to flat PDMS, the increase in static contact angle due to purely morphological contribution was around 20∘. Such an increase in contact angle was obtained despite loss of the nanometric scale during the replication process. Moreover, a significant decrease of the hysteresis contact angle was measured on PDMS replicas. The value of the contact angle hysteresis moved from 40∘ for flat PDMS to less than 10∘ for textured replicated surfaces. The wetting behavior of multiscale textured surfaces was then studied in the frame of the Wenzel and Cassie–Baxter models. Whereas the classical laws made it possible to describe the wetting behavior of the ginkgo biloba replications, a hierarchical model was developed to depict the wetting behavior of both bamboo species.

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