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Capillarity in Fluid01:19

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
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The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Capillary interactions between soft capsules protruding through thin fluid films.

Maarten Wouters1, Othmane Aouane, Marcello Sega

  • 1Department of Applied Physics, Eindhoven University of Technology, De Rondom 70, 5612 AP, Eindhoven, The Netherlands. m.p.j.wouters@tue.nl.

Soft Matter
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Summary
This summary is machine-generated.

Drying soft particles in a film show weaker capillary interactions as they deform less. This study investigates how particle softness impacts drying dynamics and cluster formation.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Colloid Science

Background:

  • Film drying involves particle aggregation due to capillary forces as fluid evaporates.
  • Capillary interactions between rigid particles are understood, but soft particle behavior remains unclear.

Purpose of the Study:

  • Investigate the role of particle softness in capillary interactions during film drying.
  • Analyze the impact of softness on menisci deformation and lateral forces.

Main Methods:

  • Utilized a novel numerical method coupling lattice Boltzmann for fluid dynamics and finite element analysis for deformable particles.
  • Simulated the drying process of a film with suspended soft particles.

Main Results:

  • Menisci deformations and capillary forces decrease with increasing particle softness.
  • Lateral interaction forces are weaker for softer particles compared to rigid ones.
  • At larger distances, forces approach those observed for rigid particles.

Conclusions:

  • Particle softness significantly reduces capillary interactions during film drying.
  • Softer particles exhibit weaker lateral forces and reduced menisci deformation.
  • The study provides insights into cluster formation dynamics in drying soft particle films.