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Related Concept Videos

Capillarity in Fluid01:19

Capillarity in Fluid

290
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.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
290
Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

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When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Capillary Assembly of Anisotropic Particles at Cylindrical Fluid-Fluid Interfaces.

Jack L Eatson1, Jacob R Gordon2, Piotr Cegielski3

  • 1Department of Physics & Mathematics, University of Hull, Hull HU6 7RX, U.K.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 18, 2023
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Summary

Researchers used computational modeling to control the assembly of rod-shaped particles at curved liquid interfaces. This method allows precise orientation and arrangement of particles for creating functional materials.

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Area of Science:

  • Colloid and surface science
  • Materials engineering
  • Computational physics

Background:

  • Colloidal particles at liquid interfaces offer unique assembly opportunities.
  • Interfacial curvature can direct colloidal self-assembly alongside particle properties.

Purpose of the Study:

  • To investigate the self-assembly of rod-shaped particles at a curved fluid-fluid interface.
  • To explore how interfacial curvature and particle properties influence colloidal assembly.

Main Methods:

  • Utilized the finite element method (Surface Evolver) for simulations.
  • Studied self-assembly of single and multiple rods on a sessile liquid drop with cylindrical geometry.
  • Varied particle properties: shape, contact angle, aspect ratio, and chemical heterogeneity.

Main Results:

  • The curved interface effectively controlled rod orientation (parallel, perpendicular, oblique).
  • Cylindrical geometry promoted tip-to-tip assembly for various rod shapes and patchy particles.
  • Triblock patchy rods showed spatial confinement due to capillary repulsion.

Conclusions:

  • Curved interfaces provide a facile strategy for manipulating rod-like particle configurations.
  • This capillary assembly method enables the organization of particles into functional materials.
  • The study demonstrates precise control over colloidal assembly through interfacial engineering.