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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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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: Jul 28, 2025

Generation of Size-controlled Poly ethylene Glycol Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices
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Engineering the Coacervate Microdroplet Interface via Polyelectrolyte and Surfactant Complexation.

Chengying Yin1, Zi Lin2, Xingyu Jiang1

  • 1Key Laboratory of Biomedical Engineering of Ministry of Education, Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China.

ACS Applied Materials & Interfaces
|June 5, 2023
PubMed
Summary

Researchers engineered stable, selective complex coacervate microdroplets using a membrane-like layer. This breakthrough enhances control over bioinspired microcompartments for applications like drug delivery and microreactors.

Keywords:
coacervate microdropletsinterfacial self-assemblymicroreactorpolyelectrolyte−surfactant complexesstability

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Area of Science:

  • Biomaterials Science
  • Soft Matter Physics
  • Origin of Life Studies

Background:

  • Complex coacervate microdroplets are formed by liquid-liquid phase separation of oppositely charged polyelectrolytes.
  • These microdroplets are promising for origin of life research, membraneless subcellular compartments, bioreactors, and drug delivery.
  • Improving the stability and selectivity of coacervate microdroplets remains a significant challenge.

Purpose of the Study:

  • To develop a method for enhancing the stability and selectivity of complex coacervate microdroplets.
  • To engineer functional bioinspired microcompartments with tunable properties.

Main Methods:

  • Generated a membrane-like layer on coacervate microdroplets using electrostatic interactions between oppositely charged surfactants and polyelectrolytes.
  • Investigated the effect of different surfactants on droplet permeability and solute sequestration.
  • Assessed the impact of the membrane-like layer on DNA hybridization.

Main Results:

  • Achieved tunable permeability and enhanced stability of coacervate microdroplets simultaneously.
  • Demonstrated that the membrane-like layer imparts selective solute sequestration based on surfactant choice.
  • Showed that the coated microdroplets can either promote or inhibit DNA hybridization.

Conclusions:

  • The developed approach provides a practical method for engineering functional bioinspired microcompartments.
  • The membrane-like layer-coated coacervate microdroplets offer tunable properties for advanced applications.
  • Potential applications include controlled drug release systems and microreactor technologies.