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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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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...
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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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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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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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Preparation and 3D Tracking of Catalytic Swimming Devices
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Diffusiophoretic self-propulsion for partially catalytic spherical colloids.

Joost de Graaf, Georg Rempfer, Christian Holm

    IEEE Transactions on Nanobioscience
    |March 10, 2015
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    Summary
    This summary is machine-generated.

    Platinum-coated colloidal spheres exhibit self-propulsion in hydrogen peroxide. Theoretical models reveal that particle velocity strongly depends on catalytic coating levels and molecule-surface interactions, even reversing motion direction.

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    Area of Science:

    • Colloid Science
    • Physical Chemistry
    • Nanotechnology

    Background:

    • Colloidal spheres with catalytic surfaces can exhibit self-propelled motion in solutions containing fuel, such as hydrogen peroxide.
    • Understanding the mechanisms driving this autophoretic motion is crucial for controlling and utilizing these active particles.

    Purpose of the Study:

    • To theoretically analyze the self-propulsion velocity of platinum-coated colloidal spheres in hydrogen peroxide.
    • To derive and validate the slip-layer approximation from a full multi-component model.
    • To investigate the influence of molecule-surface interactions and catalytic coating levels on particle velocity and motion direction.

    Main Methods:

    • Development and application of a continuum multi-component, self-diffusiophoretic model.
    • Derivation and analysis of the slip-layer approximation.
    • Exploration of the dependence of particle velocity on catalytic coating and molecule-surface interactions.

    Main Results:

    • The slip-layer approximation was derived and its validity limits established.
    • Particle velocity shows a strong, asymmetric dependence on the level of catalytic coating.
    • The direction of motion can be reversed by altering the catalytic coating percentage.
    • Results are robust with respect to variations in reaction rates at the catalytic-inert interface.

    Conclusions:

    • The theoretical model accurately describes the self-diffusiophoretic motion of catalytic colloids.
    • Molecule-surface interactions and catalytic coverage are critical parameters for controlling active particle behavior.
    • Findings provide valuable insights for interpreting experimental data on self-propelled colloids.