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Related Concept Videos

Colloids03:22

Colloids

19.6K
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...
19.6K
Colloidal precipitates01:09

Colloidal precipitates

2.9K
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...
2.9K
Colloids and Suspensions01:17

Colloids and Suspensions

2.7K
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...
2.7K

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Related Experiment Video

Updated: Nov 23, 2025

Optical Trapping of Nanoparticles
13:39

Optical Trapping of Nanoparticles

Published on: January 15, 2013

22.7K

Complex colloidal structures with non-linear optical properties formed in an optical trap.

Oto Brzobohatý, Lukáš Chvátal, Martin Šiler

    Optics Express
    |December 31, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Dielectric nanoparticles form tunable colloidal structures under laser illumination. These structures act as gradient index lenses, offering controllable optical properties for advanced applications.

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    Area of Science:

    • Colloidal science
    • Non-linear optics
    • Nanotechnology

    Background:

    • Dielectric nanoparticles exhibit unique optical properties.
    • Optical forces can induce spatial redistribution of particles.
    • Laser beams can manipulate colloidal suspensions.

    Purpose of the Study:

    • To investigate the formation of colloidal structures using counter-propagating laser beams.
    • To characterize the optical properties of these self-assembled structures.
    • To explore the tunability of these structures as optical media.

    Main Methods:

    • Illumination of a colloidal suspension with counter-propagating laser beams.
    • Analysis of particle redistribution and structure formation.
    • Employing a weak probe beam to assess optical properties.
    • Investigating the effect of trapping laser power on structure formation.

    Main Results:

    • Formation of complex colloidal structures composed of thousands of nanoparticles.
    • Demonstration that colloidal structures act as non-linear optical media.
    • Observation of gradient index lens-like behavior.
    • External tunability of optical transformation properties by adjusting laser power.

    Conclusions:

    • Laser-induced optical forces enable the formation of tunable colloidal structures.
    • These structures function as externally controllable gradient index lenses.
    • The study provides insights into the self-assembly and optical behavior of nanoparticle colloids.