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Related Concept Videos

Colloidal precipitates01:09

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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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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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The Colloidal State01:29

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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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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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Related Experiment Video

Updated: Apr 11, 2026

Synthesis and Characterization of Supramolecular Colloids
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Simple method for the synthesis of inverse patchy colloids.

P D J van Oostrum1, M Hejazifar, C Niedermayer

  • 1Institute for Biologically inspired materials Department of Nanobiotechnology BOKU: University of Natural Resources and Life Sciences Vienna, Muthgasse 11-II, 1190 Vienna, Austria.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 27, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a new, scalable method to create inverse patchy colloids (IPCs) without clean rooms. These particles offer tunable self-assembly for studying complex colloidal phase behavior.

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Supramolecular chemistry

Background:

  • Inverse patchy colloids (IPCs) are model systems for studying phase behavior of heterogeneously charged particles.
  • Unlike conventional patchy particles, IPCs feature repelling patches, leading to complex interactions.
  • Their phase behavior is influenced by patch characteristics, orientation, and substrate charge.

Purpose of the Study:

  • To present a novel, scalable, and clean-room-free method for fabricating IPCs.
  • To characterize the fabricated IPCs and demonstrate their utility in studying self-assembly.
  • To explore pH-tunable charge modification for steering self-assembly.

Main Methods:

  • Surface modification of colloidal particles to create oppositely charged polar and equatorial regions.
  • Characterization of patch size using electron microscopy.
  • Fluorescent labeling for phase behavior studies using confocal microscopy.
  • pH-mediated tuning of colloidal charges.

Main Results:

  • Successful fabrication of IPCs using a scalable, accessible method.
  • Demonstration of distinct charged regions on colloidal particles.
  • Visualization of self-assembly behavior using confocal microscopy.
  • Confirmation of pH as a control parameter for charge and self-assembly.

Conclusions:

  • The developed method provides an accessible route to synthesize IPCs.
  • IPCs offer a versatile platform for fundamental studies in colloid science.
  • pH-tunable charge presents a powerful tool for directing self-assembly processes.