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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

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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...
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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 that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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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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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,...
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Couette Flow01:22

Couette Flow

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Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
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Colloidal precipitates01:09

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Related Experiment Video

Updated: Dec 9, 2025

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Self-Propelled Janus Colloids in Shear Flow.

Bishwa Ranjan Si1, Preet Patel1, Rahul Mangal1

  • 1Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 8, 2020
PubMed
Summary
This summary is machine-generated.

Artificial Janus particles (JPs) exhibit complex flow behaviors. Their motion transitions from random to directed movement along vorticity and then flow directions as shear rate increases.

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Area of Science:

  • Colloid Science
  • Soft Matter Physics
  • Microfluidics

Background:

  • Artificial active colloids offer tunable properties for advanced applications.
  • Understanding their response to external stimuli like flow is crucial for harnessing their potential.
  • Janus particles (JPs) are model systems for active matter research.

Purpose of the Study:

  • To investigate the behavior of SiO2-Pt Janus particles in shear flow.
  • To determine how varying fuel concentrations affect particle motion under flow.
  • To identify the key parameters governing JP transitions in flow.

Main Methods:

  • Experimental study of SiO2-Pt Janus particles in an aqueous medium within a capillary.
  • Controlled application of varying shear flow rates.
  • Manipulation of hydrogen peroxide (H2O2) fuel concentrations to control propulsion speed.

Main Results:

  • Observed a transition in JP motion from random to vorticity-directed, then flow-directed with increasing shear rate.
  • Noted a significant decrease in in-plane trajectory fluctuations during these transitions.
  • Identified a delay in shear-induced rolling due to JP activity, enabling vorticity-directed migration at moderate flows.

Conclusions:

  • JP motion transitions are governed by a nondimensional parameter λ, comparing shear flow to propulsion speed.
  • JP activity influences their orientation and migration patterns in shear flow.
  • The findings provide insights into controlling active colloids in complex fluid environments.