scholarly journals Shapes of Nonsymmetric Capillary Bridges

2021 ◽  
Author(s):  
L. R. Pratt ◽  
D. T. Gomez ◽  
A. Muralidharan ◽  
N. Pesika
Keyword(s):  
Capillary Bridges

scholarly journals Formation of stable aggregates by fluid-assembled solid bridges

2020 ◽  
Author(s):  
Douglas Jerolmack ◽  
Ali Seiphoori
Keyword(s):  
Thermal Equilibrium ◽  
Colloidal Suspension ◽  
Wetting And Drying ◽  
Atomic Force ◽  
Capillary Bridges ◽  
Industrial Materials ◽  
Capillary Pressures ◽  
Microfluidics Channel ◽  
Particle Weight

<p>Earh's surface is covered with soil; particulate mixtures subject to cycles of wetting and drying. The role of this transient hydrodynamic forcing in creating and destroying aggregates is virtually unexplored. We examine this process at the grain scale. When a colloidal suspension is dried, capillary pressure may overwhelm repulsive electrostatic forces, assembling aggregates that are out of thermal equilibrium. This poorly understood process confers cohesive strength to many geological and industrial materials. Here we observe evaporation-driven aggregation of natural and synthesized particulates, and then probe their stability under rewetting using a microfluidics channel as a flume to determine the entrainment threshold. We also directly measure bonding strength of aggregates using an atomic force microscope. Cohesion arises at a common length scale (~5 microns), where interparticle attractive forces exceed particle weight. In polydisperse mixtures, smaller particles condense within shrinking capillary bridges to build stabilizing “solid bridges” among larger grains. This dynamic repeats across scales forming remarkably strong, hierarchical clusters, whose cohesion derives from grain size rather than mineralogy. Transient capillary pressures are even sufficiently large to sinter the smallest particles together. These results may help to understand the strength and erodibility of natural soils, and other polydisperse particulates that experience transient hydrodynamic forces.</p>

scholarly journals Non-contact printing of optical waveguides using capillary bridges

2018 ◽  
Vol 26 (9) ◽  
pp. 11934 ◽  
Author(s):  
Pius M. Theiler ◽  
Fabian Lütolf ◽  
Rolando Ferrini
Keyword(s):  
Optical Waveguides ◽  
Contact Printing ◽  
Capillary Bridges

Hardening of particle/oil/water suspensions due to capillary bridges: Experimental yield stress and theoretical interpretation

2018 ◽  
Vol 251 ◽  
pp. 80-96 ◽  
Author(s):  
Krassimir D. Danov ◽  
Mihail T. Georgiev ◽  
Peter A. Kralchevsky ◽  
Gergana M. Radulova ◽  
Theodor D. Gurkov ◽  
...  
Keyword(s):  
Yield Stress ◽  
Theoretical Interpretation ◽  
Water Suspensions ◽  
Capillary Bridges ◽  
Experimental Yield ◽  
Oil Water

Humidity-Induced Cohesion Effects in Granular Media

2000 ◽  
Vol 627 ◽  
Author(s):  
Nathalie Fraysse ◽  
Luc Petit
Keyword(s):  
Granular Medium ◽  
Granular Media ◽  
Global Scale ◽  
Interparticle Forces ◽  
Wetting Properties ◽  
Small Glass ◽  
Capillary Bridges ◽  
Scale Properties ◽  
Comparison Of The Results ◽  
Maximal Stability

ABSTRACTExperiments were performed under accurately-controlled humidity conditions in order to quantify effects induced by humidity on granular materials. Measurements of the maximal stability angle of a pile made of small glass beads are reported as a function of the relative vapor pressure in the cell, up to close to saturation. The comparison of the results obtained with fluids differing in their molecular interactions with glass, namely water and heptane, shows that the wetting properties of the interstitial liquid on the grains have a strong influence on the cohesion of the non-saturated granular medium. This suggests that gravimetric experiments which could indirectly give information on the size of the capillary bridges that form between grains should be useful to understand the close connection that exists, through interparticle forces, between microscopic properties such as wetting properties and surface roughness of the grains, and global-scale properties of the pile, as its stability and flowability.

Formation and rupture of capillary bridges in atomic scale friction

2012 ◽  
Vol 137 (16) ◽  
pp. 164706 ◽  
Author(s):  
Itay Barel ◽  
Aleksander E. Filippov ◽  
M. Urbakh
Keyword(s):  
Atomic Scale ◽  
Capillary Bridges

Investigation of capillary bridges growth in NIL process

2007 ◽  
Author(s):  
Stefan Landis ◽  
Tanguy Leveder ◽  
Nicolas Chaix ◽  
Cecile Gourgon
Keyword(s):  
Capillary Bridges

Simulation of Capillary Bridges between Nanoscale Particles

Langmuir ◽  
2014 ◽  
Vol 30 (4) ◽  
pp. 1055-1062 ◽  
Author(s):  
Michael Dörmann ◽  
Hans-Joachim Schmid
Keyword(s):  
Nanoscale Particles ◽  
Capillary Bridges

scholarly journals Investigation of Single and Binary of “Sandwich” Type Convex Liquid Capillary Bridges, Stretched between Two Flat Surfaces (Experimental Approach)

2019 ◽  
Vol 3 (4) ◽  
pp. 68 ◽  
Author(s):  
Plamen V. Petkov ◽  
Boryan Radoev
Keyword(s):  
Static Stretching ◽  
Immiscible Liquids ◽  
Geometrical Properties ◽  
Flat Surfaces ◽  
Capillary Bridges ◽  
Sandwich Type ◽  
New Type ◽  
Receding Contact ◽  
Receding Contact Angle ◽  
Solid Liquid

The interest to monophasic liquid capillary bridges (CB) has a long history. These shapes are attractive not only because of their interesting surface properties but also because of the possibility of their behavior to be analytically predicted by the equations of differential geometry. In the current paper we extend our previous studies by implementation of an approach for prediction of liquid gravityless CB behavior during their quasi-static stretching. It was found, that a simple linear relation, h r m ~ ln R r m , is valid the case of good wetting, 0° ≤ θ ≤ 90°, where h is the height of CB, R is the radius at the contact surface, rm is the CB waist radius, and θ is the solid/liquid (static, receding) contact angle. We experimentally studied the geometrical properties evolution of monophasic cedar oil and water CBs between two glass plates during their quasi-static (stepwise with equilibration after each step for 1–2 min.) stretching. In addition, we investigated a binary CB of a new type, resembling “sandwich”. There, due to the stronger glass wetting by the water, the oil phase is adhered at the water/gas interface, partially engulfed with a tendency to stand in the zone around the waist (minimal surface energy). During the stretching, it tends to replace the water in the CB waist region. A simple mechanism for interaction of the two immiscible liquids leading to creation of “sandwich” like binary structures, is proposed. Experiments of capillary bridges (CB) stretching between two flat surfaces have been carried for all liquids at different volume proportions. The investigation is extended also to identification of CB profile generatrix shape. We experimentally found that for monophasic CB, it can be described by a circle during the quasi-static stretching. If the CB height is increased, before the rupture, the shape evolves consecutively to an ellipse, parabola, or possibly to a hyperbola. The investigated binary CB evolves a similar way. Conclusions are drawn and directions for further investigations are given.

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