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Related Concept Videos

The Colloidal State01:29

The Colloidal State

56
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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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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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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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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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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Related Experiment Video

Updated: Mar 9, 2026

Optical Trapping of Nanoparticles
13:39

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Published on: January 15, 2013

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Influencing colloidal formation with optical traps.

Ifat Jacob1, Eitan Edri1, Erel Lasnoy1

  • 1Department of Chemistry, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat Gan, 5290002, Israel. hagay.shpaisman@biu.ac.il.

Soft Matter
|January 12, 2017
PubMed
Summary
This summary is machine-generated.

Optical traps precisely control emulsion polymerization, creating custom-shaped colloids. This versatile method avoids chemical modifications for tailored particle synthesis.

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Area of Science:

  • Colloid and Polymer Science
  • Optical Physics
  • Materials Science

Background:

  • Emulsion polymerization is a key process for synthesizing polymer particles.
  • Controlling particle morphology and dimensions post-synthesis often requires complex chemical strategies.
  • Developing non-chemical methods for precise control over colloid formation is an ongoing challenge.

Purpose of the Study:

  • To introduce a novel method for controlling emulsion polymerization using optical traps.
  • To demonstrate the formation of spherical and elongated colloids with specific dimensions.
  • To highlight the versatility and ease of morphological control without chemical intervention.

Main Methods:

  • Utilizing optical traps to manipulate and influence the polymerization of emulsion droplets.
  • Directing the coalescence and partial fusion of intermediate nucleation sites within droplets.
  • Characterizing the dimensions and morphology of the resulting colloidal particles.

Main Results:

  • Successful application of optical traps to guide emulsion polymerization.
  • Formation of precisely dimensioned spherical and elongated colloidal particles.
  • Demonstration of morphological control through directed coalescence and fusion.

Conclusions:

  • Optical traps offer a powerful, non-chemical tool for tailoring colloid synthesis.
  • This technique provides a versatile platform for creating customized colloidal structures.
  • The method simplifies the production of specific particle shapes and sizes for advanced applications.