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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
Capillarity in Fluid01:19

Capillarity in Fluid

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...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Steady, Laminar Flow in Circular Tubes01:23

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Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
Steady, Laminar Flow Between Parallel Plates01:17

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.

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Updated: Jun 14, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Structural evolution of colloidal gels during constricted microchannel flow.

Jacinta C Conrad1, Jennifer A Lewis

  • 1Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA. jcconrad@uh.edu

Langmuir : the ACS Journal of Surfaces and Colloids
|April 8, 2010
PubMed
Summary
This summary is machine-generated.

Colloidal gels flowing through microchannel constrictions exhibit increased velocity and density downstream. Shear-induced yielding at dense cluster boundaries creates structural heterogeneity, impacting flow dynamics.

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Area of Science:

  • Rheology
  • Soft Matter Physics
  • Microfluidics

Background:

  • Colloidal gels are complex fluids with unique flow properties.
  • Understanding their behavior in confined geometries is crucial for applications.
  • Microfluidic devices offer a controlled environment to study these phenomena.

Purpose of the Study:

  • To investigate the structural evolution of colloidal gels during flow through microchannel constrictions.
  • To analyze the impact of constrictions on local flow profiles and particle distribution.
  • To elucidate the mechanisms of shear-induced yielding in dense colloidal suspensions.

Main Methods:

  • Confocal microscopy was employed to visualize the gel structure in situ.
  • Microfluidic channels with controlled constrictions were used for flow experiments.
  • Particle tracking and density analysis were performed to quantify flow behavior.

Main Results:

  • Increased average velocity and particle density were observed downstream of the constriction.
  • Stagnation zones formed at the constriction entry, leading to heterogeneous local flow.
  • Dense clusters exhibited shear-induced yielding at intercluster boundaries.
  • Structural heterogeneity was enhanced at the constriction outlet.

Conclusions:

  • Microchannel constrictions significantly alter colloidal gel flow dynamics.
  • Nonuniform flow profiles and yielding phenomena contribute to structural changes.
  • The findings provide insights into the rheology of soft materials in confined spaces.