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Related Concept Videos

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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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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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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Phase-Contrast Microscopes
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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Anisotropic structural color particles from colloidal phase separation.

Huan Wang1,2, Yuxiao Liu2, Zhuoyue Chen2

  • 1Department of Clinical Laboratory, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing 210008, China.

Science Advances
|January 18, 2020
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Summary
This summary is machine-generated.

Researchers developed novel anisotropic structural color particles (SCPs) using graphene oxide and nanoparticles. These functional materials exhibit brilliant colors and controllable properties for biomedical sensing applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Structural color materials are widely studied for their unique optical properties.
  • There is a growing trend towards developing functional structural color materials with novel components and structures for diverse applications.
  • Graphene oxide (GO) and colloidal nanoparticles are key components in advanced material design.

Purpose of the Study:

  • To investigate the coassembly of graphene oxide (GO) and colloidal nanoparticles in droplets.
  • To create novel anisotropic structural color particles (SCPs) with unique morphologies and optical properties.
  • To explore the potential of these SCPs and their hydrogel derivatives in biomedical applications, particularly for dynamic cell monitoring and sensing.

Main Methods:

  • Coassembly of graphene oxide (GO) and colloidal nanoparticles within droplets.
  • Induction of component phase separation to form anisotropic structures.
  • Fabrication of inverse opal hydrogel derivatives from the anisotropic SCPs.

Main Results:

  • Achieved previously unknown anisotropic structural color particles (SCPs) with hemispherical colloidal crystal clusters and oblate GO components.
  • The anisotropic SCPs and their hydrogel derivatives exhibited brilliant structural colors.
  • Demonstrated controllable capabilities including fixation, location, orientation, and responsiveness of the anisotropic SCPs.
  • Showcased the suitability of anisotropic hydrogel SCPs for dynamic cell monitoring and sensing.

Conclusions:

  • Anisotropic SCPs and their inverse opal hydrogel derivatives possess unique structural, morphological, and compositional features.
  • These materials exhibit brilliant structural colors and controllable functionalities, making them ideal for advanced applications.
  • The anisotropic hydrogel SCPs demonstrate significant potential for dynamic cell monitoring and sensing in biomedical fields.