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Related Concept Videos

Colloids and Suspensions01:17

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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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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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Couette Flow01:22

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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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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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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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Colloids03:22

Colloids

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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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Interfacial Flow around Brownian Colloids.

Mehdi Molaei1, Nicholas G Chisholm1, Jiayi Deng1

  • 1Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Physical Review Letters
|June 21, 2021
PubMed
Summary
This summary is machine-generated.

Correlated displacement velocimetry measures flow around Brownian particles at interfaces. This reveals the interface

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Area of Science:

  • Fluid dynamics
  • Colloidal science
  • Soft matter physics

Background:

  • Understanding particle motion at interfaces is key to colloidal self-organization and hydrodynamic interactions.
  • Interfacial flows govern the behavior of colloids and soft materials.

Purpose of the Study:

  • To develop a method for measuring flow fields around interfacially trapped Brownian particles.
  • To analyze the resulting flow structures and their implications for interfacial properties.

Main Methods:

  • Correlated displacement velocimetry (CDV) was employed to track particle movement and map flow fields.
  • Interfacial flow fields were decomposed into hydrodynamic multipoles (monopole, dipole).

Main Results:

  • CDV successfully measured flow fields around interfacially trapped Brownian particles.
  • The analysis revealed interfacial multipole structures, providing insights into the interface's mechanical response.
  • The interface was found to be incompressible under specific conditions, indicating an ideal gaseous state with scant surfactant.

Conclusions:

  • The developed method offers key insights into interfacial mechanics and hydrodynamic coupling.
  • The interface's incompressibility and properties can be deduced from flow structures.
  • The dataset enables virtual experiments for predicting interfacial responses to complex forces.