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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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Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
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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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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Short-time self-diffusion in binary colloidal suspensions.

V Ruzzi1, S Buzzaccaro1, P Moretti1

  • 1Department of Chemistry, Materials Science, and Chemical Engineering (CMIC), Politecnico di Milano, Edificio 6, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.

The Journal of Chemical Physics
|September 23, 2024
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Summary
This summary is machine-generated.

The diffusion of tracer colloidal particles is affected by surrounding host particles, not just solvent viscosity. This study quanties these effects across various particle sizes, finding a weaker size-ratio dependence than predicted.

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Area of Science:

  • Colloid Science
  • Soft Matter Physics
  • Physical Chemistry

Background:

  • Brownian dynamics of colloidal particles are influenced by surrounding particles.
  • Existing research lacks detailed experimental data on these interactions, impacting microrheology and phoretic transport.
  • These effects are distinct from changes in solvent viscosity.

Purpose of the Study:

  • To experimentally investigate the short-time self-diffusion of tracer particles in binary colloidal mixtures.
  • To quantify the first-order correction to the tracer diffusion coefficient based on host particle concentration and size ratio.
  • To compare experimental findings with theoretical predictions for hard-sphere mixtures.

Main Methods:

  • Utilized dynamic light scattering (DLS) for extensive investigation.
  • Focused on systems with a very dilute "tracer" species and a concentrated "host" species.
  • Analyzed DLS correlation functions to determine diffusion coefficients across varying tracer-to-host size ratios (0.2 ≤ q ≤ 2).

Main Results:

  • Obtained the first-order correction (hs1s) to the tracer diffusion coefficient.
  • Experimental results support the theoretical functional relation of hs1s on the size ratio q.
  • Observed a weaker dependence of hs1s on the size ratio than theoretically predicted.

Conclusions:

  • The study provides the first detailed experimental survey of tracer particle diffusion in crowded colloidal environments.
  • Discrepancies with theoretical predictions may stem from non-ideal hard-sphere behavior due to stabilizing surfactant layers.
  • Hydrodynamic lubrication forces, influenced by surface layers, play a significant role in particle diffusion.