Receding contact angle
The contact angle is the angle, conventionally measured through the liquid, where a liquid/vapor interface meets a solid surface. It quantifies the wettability of a solid surface by a liquid via the Young equation. A given system of solid, liquid, and vapor at a given temperature and pressure has a unique equilibrium contact angle. However, in practice contact angle hysteresis is observed, ranging from the so-called advancing (maximal) contact angle to the receding (minimal) contact angle. The equilibrium contact is within those values, and can be calculated from them. The equilibrium contact angle reflects the relative strength of the liquid, solid, and vapor molecular interaction.

This is an excerpt from the article Receding contact angle from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
The article Receding contact angle at en.wikipedia.org was accessed 22 times in the last 30 days. (as of: 11/08/2013)
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Contact angle - Wikipedia, the free encyclopedia
However, in practice contact angle hysteresis is observed, ranging from the so- called advancing (maximal) contact angle to the receding (minimal) contact angle  ...
en.wikipedia.org/wiki/Contact_angle
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Wetting - MIT
6) Wettability, non-wettability and contact angle hysteresis ... Advancing contact angle (θA < θR) is always larger than or equal to the Receding contact angle.
web.mit.edu/nnf/education/wettability/wetting.html
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ramé-hart Contact Angle
The contact angle is critical to understanding wetting, adhesiveness or adhesion, and for measuring solid surface free energy.
www.ramehart.com/contactangle.htm
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Contact angle | Attension Tensiometers
When the drop has recently contracted the angle is said to represent the 'receded ' contact angle. These angles fall within a range with advanced angles ...
www.attension.com/applications/measurements/contact-angle
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Contact Angle and Wetting Properties - Springer
the liquid are referred to as the advancing contact angle θa and the receding contact angle θr, respectively (Fig. 1.3). These angles fall within a range, with the  ...
www.springer.com/cda/content/document/cda_downloaddocument/9783642342424-c1.pdf?SGWID=0-0-45-1368817-p174704744
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Recipe for Advancing and Receding Contact Angle Measurements
The advancing angle is the largest possible angle and the receding is the smallest possible contact angle. Both are presumed to be measured at thermodynamic ...
www.firsttenangstroms.com/faq/RecipeForRecedingAngles.html
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Reliable Measurement of the Receding Contact Angle - Langmuir ...
Mar 1, 2013 ... Surface wettability is usually evaluated by the contact angle between the perimeter of a water drop and the surface. However, this single ...
pubs.acs.org/doi/abs/10.1021/la400009m
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What is Contact Angle? - Kyowa Interface Science
The “contact angle” is very intuitive and easy to understand as an indicator of ... This case simulates (with the advancing contact angle and receding contact ...
www.face-kyowa.co.jp/english/en_science/en_theory/en_what_contact_angle/
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contact angle hysteresis
advancing - receding angles hysteresis: no unique value for contact angle pinning force: H = γ (cos ... what will we do: • contact line deformation of single defect.
www.utwente.nl/tnw/pcf/education/jmbc_course_on_capillarity_driv/Presentations/snoeijer_hysteresis.pdf
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Contact angle - KRÜSS GmbH
In the case of complete wetting (spreading), the contact angle is 0°. Between 0° and 90°, the solid is wettable and above 90° it is not wettable. In the case of ...
www.kruss.de/services/education-theory/glossary/contact-angle/
Search results for "Receding contact angle"
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Receding contact angle in science
Reliable measurement of the receding contact angle.
Mar 11, 2013 ... Molecular Materials, Department of Applied Physics, Aalto University School of Science (former ... Surface wettability is usually evaluated by the contact angle ... Measuring the Receding contact angle can be challenging, ...
Contact Angle - Surface Science Western
Contact angle measurements / goniometry measures this angle... ... Western at the University of Western Ontario » Analytical Services » Contact Angle ... Static and dynamic drops; Advancing and Receding contact angles; Surface tension ...
The Effect of Drop (Bubble) Size on Advancing and Receding ...
Apr 19, 2002 ... The advancing and Receding contact angles were measured for ... a Department of Metallurgical Engineering, University of Utah, WBB 412, Salt ...
[PDF]4 study of advancing & receding contact angles - Bibliothèque et ...
University: University of Toronto. Three types of experiments were used to study advancing and Receding contact angles (and contact angle hysteresis), narnely ...
Contact Angle - UWEB - University of Washington
Immediately following the advancing contact angle experiment, it is useful to obtain a 'Receding contact angle' value by monitoring the contact angle as ...
[PDF]Determination of the Receding Contact Angle of Sessile Drops on ...
Department of Chemistry, Kocaeli University, 41300, I˙zmit, Kocaeli, Turkey, ... The Receding contact angles of water drops on PMMA and PET surfaces were ...
Drop Rebound after Impact: The Role of the Receding Contact Angle
Aug 19, 2013 ... Department of Engineering, University of Bergamo, Viale Marconi 5, 24044 ... It was found that the Receding contact angle is the key wetting ...
[PDF]Reliable Measurement of the Receding Contact Angle - American ...
Mar 1, 2013 ... Receding contact angles also need to be measured. Measuring ..... work made use of Aalto University Nanomicroscopy Center. (Aalto-NMC) ...
[PDF]contact angle hysteresis
Physics of Fluids - University of Twente contact angle hysteresis ... advancing - receding angles hysteresis: no unique value for contact angle pinning force: H = γ ...
[PDF]Contact Angles for Liquid Drops at a Model Heterogeneous Surface ...
Department of Metallurgical Engineering, University of Utah, Salt Lake City, Utah 84112, and Department ... Both contact angles, advancing and receding, were.
Books on the term Receding contact angle
Contact Angle, Wettability and Adhesion
Contact Angle, Wettability and Adhesion
K. L. Mittal, 2009
The wettability of real surfaces is, therefore, empirically characterized by the apparent contact angle subtended by the drop at the surface during advancement and receding events, known as the advancing and Receding contact angles.
Contact Angle, Wettability and Adhesion, Volume 6
Contact Angle, Wettability and Adhesion, Volume 6
Kash L. Mittal, 2009
The topic of wettability (measured in terms of contact angle) is of tremendous interest from both fundamental and applied points of view, Wettability plays an essential role in many industrial processes, so an understanding of factors dictating wettability and how to modulate it is of paramount importance. In the last years there has been an explos...
Advances in Contact Angle, Wettability and Adhesion
Advances in Contact Angle, Wettability and Adhesion
K. L. Mittal, 2013
19.3.1 Advancing and Receding contact angles The advancing and Receding contact angles depending on the ambient relative humidity are plotted in Figures 19.1a,b. It is clearly seen that humidity influences both the advancing and receding ...
Contact Angle, Wettability and Adhesion, Volume 5
Contact Angle, Wettability and Adhesion, Volume 5
Kash L. Mittal, 2008
This volume chronicles the proceedings of the 5th International Symposium on Contact Angle, Wettability and Adhesion, Toronto, Canada, June 2006. Wettability is of pivotal importance in many and varied arenas, ranging from mundane to micro-and nanofluidics to lithography to biomedical. It should be underscored that in the last years there has been ...
Encyclopedia of Surface and Colloid Science
Encyclopedia of Surface and Colloid Science
P. Somasundaran, 2006
The contact angle of the free interface (0ajr) between air and the liquid is Oa-,T = 180°. An advancing ... (A) As the drop retreats, the contact line crosses the flat tops of the asperities with the inherent Receding contact angle (0r.0). (B) When the ...
Contact Lens Practice, 2e
Contact Lens Practice, 2e
Nathan Efron BScOptom PhD (Melbourne) DSc (Manchester) FAAO (Dip CCLRT) FIACLE FCCLSA FBCLA FACO, 2010
Thoroughly revised and updated, this popular book provides a comprehensive yet easy to read guide to modern contact lens practice. Beautifully re-designed in a clean, contemporary layout, this second edition presents relevant and up-to-date information in a systematic manner, with a logical flow of subject matter from front to back. This book wonde...
Pore Structure of Cement-Based Materials: Testing, ...
Pore Structure of Cement-Based Materials: Testing, ...
Kalliopi K. Aligizaki, 2006
If the advancing contact angle, 0a, is different from the Receding contact angle, 6r, the retraction mercury curve will be different from the penetration curve. The advancing contact angle, 0a, is as a rule greater than the Receding contact angle, 6, ...
Dropwise Condensation on Inclined Textured Surfaces (SpringerBriefs in Applied Sciences and Technology / SpringerBriefs...
Dropwise Condensation on Inclined Textured Surfaces (SpringerBriefs in Applied Sciences and Technology / SpringerBriefs...
Sameer Khandekar and Krishnamurthy Muralidhar, 2013
Dropwise Condensation on Textured Surfaces presents a holistic framework for understanding dropwise condensation through mathematical modeling and meaningful experiments. The book presents a review of the subject required to build up models as well as to design experiments. Emphasis is placed on the effect of physical and chemical texturing and the...
Drops and Bubbles in Contact with Solid Surfaces
Drops and Bubbles in Contact with Solid Surfaces
Michele Ferrari, Libero Liggieri, Reinhard Miller, 2012
It is interesting that surfactant solutions display higher advancing contact angles on the PTFE surface compared to non-aqueous ... As CAH increases however ( e.g., as concentration increases and Receding contact angle (discussed below), ...
A Heat Transfer Textbook: Fourth Edition (Dover Civil and Mechanical Engineering)
A Heat Transfer Textbook: Fourth Edition (Dover Civil and Mechanical Engineering)
John H Lienhard V and John H Lienhard IV, 2011
This introduction to heat transfer offers advanced undergraduate and graduate engineering students a solid foundation in the subjects of conduction, convection, radiation, and phase-change, in addition to the related topic of mass transfer. A staple of engineering courses around the world for more than three decades, it has been revised and updated...
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Blog posts on the term
Receding contact angle
Dr. Amirfazli & His Colleagues Make the Cover of Langmuir! | Lassonde's Mechanical Engineering
Congratulations to Dr. Amirfazli and his colleagues, whose work made the cover of Langmuir, the ACS Journal of Surfaces and Colloids! Dr. Amirfazli, in collaboration with two European colleagues from University of Bergamo, Italy, and ETH in Switzerland, studied drop rebound, which is one of the most spectacular outcomes of drop impacting on a solid…
mechenglassonde.wordpress.com/2013/12/06/dr-amirfazli-his-colleagues-make-the-cover-of-langmuir/
"Droplet retention on an incline" by S. Ravi Annapragada, Jayathi Y. Murthy et al.
The present study seeks to understand and predict droplet retention on smooth hydrophobic surfaces. The droplet shape and the advancing and Receding contact angles are experimentally measured as a function of droplet size under the action of a gravitational force at different inclination angles. The advancing and Receding contact angles are correlated with static contact angle and Bond number. A Volume of Fluid Continuous Surface Force model with varying contact angles along the triple contact line is developed to predict droplet shape. The model is first verified against a two dimensional analytical solution. It is then used to simulate the shape of a sessile droplet on an incline at various angles of inclination and to determine the critical angle of inclination as a function of droplet size. Good agreement is found between experimental measurements and predictions. The contact line profile and contact area are also predicted. The contact area predictions based on a spherical-cap assumption are compared to the numerical predictions and are found to underpredict the droplet contact area. (C) 2011 Elsevier Ltd. All rights reserved.
docs.lib.purdue.edu/nanopub/1248/
Superhydrophobic Tracks: Guided Transport of Droplets
Recent research has shown that superhydrophobic tracks can be used for fast and simple transport of water droplets in microfluidic devices.
www.atascientific.com.au/blog/2012/06/15/superhydrophobic-tracks-guided-transport-droplets/
Solving the Problems of Plastics Adhesion | Adhesion Bonding
Plastic substrates are difficult to bond because they are hydrophobic, possess poor surface wettability, nonpolar inert structures and possess poor surface-chemical functionality. This article discusses the surface science to achieve strong adhesion bond strength.
www.adhesionbonding.com/2012/05/03/solving-the-problems-of-plastics-adhesion/
Mechanism of Water Infiltration and Defiltration through ZSM-5 Zeolite: Heating and Sodium Chloride Concentration Effect
The overall aim of the Journal of Nanomaterials is to bring science and applications together on nanoscale and nanostructured materials with emphasis on synthesis, processing, characterization, and applications of materials containing true nanosize dimensions or nanostructures that enable novel/enhanced properties or functions. It is directed at both academic researchers and practicing engineers. Journal of Nanomaterials will highlight the continued growth and new challenges in nanomaterials science, engineering, and nanotechnology, both for application development and for basic research. All papers should emphasize original results relating to experimental, theoretical, computational, and/or applications of nanomaterials ranging from hard (inorganic) materials, through soft (polymeric and biological) materials, to hybrid materials or nanocomposites.
www.hindawi.com/journals/jnm/aip/249369/
What is “Hydrophobe” ? - LifeSun
Hydrophobe In chemistry, hydrophobicity is the physical property of a molecule (known as a hydrophobe) that is repelled from a mass of water. Hydrophobic molecules tend to be non-polar and, thus, prefer other
lifesun.info/what-is-hydrophobe/
"Investigations of surface-tension effects due to small-scale complex b" by Jiansheng Feng
In this Ph.D. dissertation, we have investigated some important surface-tension phenomena including capillarity, wetting, and wicking. We mainly focus on the geometric aspects of these problems, and to learn about how structures affect properties. . ^ In the first project (Chapter 2), we used numerical simulations and experiments to study the meniscus of a fluid confined in capillaries with complicated cross-sectional geometries. In the simulations, we computed the three-dimensional shapes of the menisci formed in polygonal and star-shaped capillaries with sharp or rounded corners. Height variations across the menisci were used to quantify the effect of surface tension. Analytical solutions were derived for all the cases where the cross-sectional geometry was a regular polygon or a regular star-shape. Power indices that characterize the effects of corner rounding were extracted from simulation results. These findings can serve as guide for fabrications of unconventional three-dimensional structures in Capillary Force Lithography experiments. Experimental demonstrations of the working principle was also performed. Although quantitative matching between simulation and experimental results was not achieved due to the limitation of material properties, clear qualitative trends were observed and interesting three-dimensional nano-structures were produced. ^ A second project (Chapter 3) focused on developing techniques to produce three-dimensional hierarchically structured superhydrophobic surfaces with high aspect ratios. We experimented with two different high-throughput electron-beam-lithography processes featuring single and dual electron-beam exposures. After a surface modification procedure with a hydrophobic silane, the structured surfaces exhibited two distinct superhydrophobic behaviors—high and low adhesion. While both types of superhydrophobic surfaces exhibited very high (approximately 160° water advancing contact angles, the water Receding contact angles on these two different types of surfaces differed by about 50° ∼ 60°, with the low-adhesion surfaces at about 120° ∼ 130° and the high-adhesion surfaces at about 70° ∼ 80°. Characterizations of both the microscopic structures and macroscopic wetting properties of these product surfaces allowed us to pinpoint the structural features responsible for specific wetting properties. It is found that the advancing contact angle was mainly determined by the primary structures while the Receding contact angle is largely affected by the side-wall slope of the secondary features. This study established a platform for further exploration of the structure aspects of surface wettability. ^ In the third and final project (Chapter 4), we demonstrated a new type of microfluidic channel that enable asymmetric wicking of wetting fluids based on structure-induced direction-dependent surface-tension effect. By decorating the side-walls
scholarworks.umass.edu/dissertations/AAI3556245/
"Numerical simulation of wall impinging drops" by Shiladitya Mukherjee
In this work, numerical investigations of impinging drops on dry and wet walls are reported. A multiple-relaxation-time (MRT) axisymmetric multiphase lattice-Boltzmann (LB) model is employed along with a model for simulating surface wettability. For simulations on wet walls, a recently developed high density-ratio LB model is employed. This model is extended in this work to include the MRT collision model and thereby achieve Reynolds number which are 50% higher, and adapted to an axisymmetric coordinate system. The model is evaluated by verifying the Laplace-Young relation for a liquid drop and comparing the computed frequency of oscillations of an initially ellipsoidal drop with analytical values. Agreement within 8% is obtained. ^ When the impingement is on dry walls, the outcomes are deposition, rebound and splash. In deposition, the dynamic contact angle evolution during spread and recoil was shown to be influenced by the drop inertia and transient effects of the varying contact line speed. The tendency to rebound increases with increase in static advancing and Receding contact angles, and the shape of the drop at the time of rebound becomes elongated as Weber number (We) and equilibrium contact angle increase. The transition to splash depends on We and Oh. Splash at low We and high Oh leads to formation of a liquid crown before it breaks up into smaller droplets. ^ When the impingement is on wet walls, the growth of the liquid crown and its breakup are influenced by the wall liquid film thickness and the ambient gas density and viscosity. When the wall-film thickness is small, the growth rates of the crown radius and height increase with increasing thickness and breakup time is increased. On thicker films, however, the growth rates have the opposite trend. The crown breakup time is further increased. When the gas density increases, the growth rates of crown radius and height decrease, and crown breakup occurs at a longer time. Increasing the gas viscosity has a weak influence on the growth rate of crown radius. However, at higher gas viscosity the crown height grows faster and breaks up earlier. ^
docs.lib.purdue.edu/dissertations/AAI3263610/
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