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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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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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Coagulation01:06

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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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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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Related Experiment Video

Updated: Aug 23, 2025

Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels
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Responsive microgels-based colloidosomes constructed from all-aqueous pH-switchable coacervate droplets.

Ritu Toor1, Amanda Neujahr Copstein1, Claire Trébuchet1

  • 1Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, 33400 Talence, France.

Journal of Colloid and Interface Science
|November 3, 2022
PubMed
Summary
This summary is machine-generated.

Stimuli-responsive microgels create elastic colloidosomes from coacervates, enabling tunable encapsulation and release of water-soluble payloads. These advanced polymeric capsules offer controlled transport and size-selective permeability for diverse applications.

Keywords:
CoacervateColloidosomesEncapsulationMicrogelResponsive membrane

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Area of Science:

  • Polymer Science
  • Materials Science
  • Colloid Science

Background:

  • Colloidosomes offer tunable pore distribution for advanced capsule design.
  • Coacervates stabilized by microgels provide a novel route to all-aqueous colloidosomes.

Purpose of the Study:

  • To develop and characterize stimuli-responsive colloidosomes using coacervates stabilized by microgel monolayers.
  • To investigate the encapsulation, release, and permeability properties of these novel polymeric capsules.

Main Methods:

  • Utilizing methacrylated poly(N-isopropylacrylamide) (pNIPAM) microgels to stabilize coacervates.
  • Cross-linking microgels via UV irradiation and analyzing assemblies with confocal microscopy.
  • Assessing permeability to dextrans and nanoparticles before and after coacervate dissolution.

Main Results:

  • PNIPAM microgels effectively stabilize coacervates, forming elastic colloidosomes after cross-linking.
  • The resulting colloidosomes maintain structural integrity after coacervate dissolution and exhibit significant surface deformability.
  • Coacervate core enables payload sequestration and controlled release, with size-selective membrane permeability tunable by microgel phase transitions.

Conclusions:

  • Coacervate-embedded colloidosomes present a versatile platform for encapsulation and extraction.
  • These systems facilitate controlled transport of water-soluble and dispersed species.
  • Tunable membrane properties open new avenues for smart material design.