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Related Concept Videos

Colloids03:22

Colloids

21.5K
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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Colloids and Suspensions01:17

Colloids and Suspensions

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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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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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Optically transparent dense colloidal gels.

M Zupkauskas1, Y Lan1,2,3, D Joshi1

  • 1Optoelectronics Group , Department of Physics , Cavendish Laboratory , University of Cambridge , J J Thomson Avenue , Cambridge CB3 0HE , UK .

Chemical Science
|October 4, 2017
PubMed
Summary
This summary is machine-generated.

We developed a novel, transparent colloidal gel using refractive index-matched fluorinated latex particles. This innovation allows detailed study of molecular transport within complex gel structures, advancing materials science.

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Area of Science:

  • Soft Matter Physics
  • Colloid Science
  • Materials Chemistry

Background:

  • Studying porous colloidal gels and molecular transport is challenging due to opacity caused by refractive index mismatches.
  • Traditional methods are limited in analyzing opaque gel systems, hindering understanding of internal dynamics.

Purpose of the Study:

  • To develop a novel colloidal gel system that overcomes opacity issues for detailed structural and transport studies.
  • To enable precise measurement of colloidal transport within gels using refractive index matching.
  • To functionalize these gels for advanced applications, such as DNA sequence attachment.

Main Methods:

  • Synthesis of fluorinated latex (FL) particles with a low refractive index (n = 1.37) via emulsion polymerization.
  • Functionalization of FL particles with polystyrene-b-poly(ethylene oxide) (PS-PEO) block copolymers using a swelling-deswelling method.
  • DNA attachment to block copolymers via a strain-promoted alkyne-azide click reaction.
  • Structural analysis of single and composite gels.
  • Measurement of tracer colloid diffusivity using Dynamic Differential Microscopy (DDM).

Main Results:

  • Demonstrated a novel, refractive index-matched colloidal gel using fluorinated latex particles, enabling optical transparency.
  • Successfully functionalized FL particles with DNA sequences via a PS-PEO brush layer.
  • Characterized structural properties of FL-only and composite gels.
  • Measured the diffusivity of tracer colloids within the transparent gel as a function of local confinement.

Conclusions:

  • The developed refractive index-matched colloidal gel provides a transparent platform for studying porous materials.
  • This system allows for detailed investigation of colloidal and molecular transport dynamics within gels.
  • The functionalization capability opens avenues for creating advanced smart materials and biomimetic systems.