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Colloids and Suspensions01:17

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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 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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Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
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Design Example: Aggregate Gradation01:24

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The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
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A Gradient-generating Microfluidic Device for Cell Biology
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A Continuous Gradient Colloidal Glass.

Marius Schöttle1, Tobias Lauster1, Lukas J Roemling2

  • 1Department of Chemistry, University of Bayreuth, Universitätsstr. 30, 95447, Bayreuth, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|November 11, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to create colloidal glasses with a continuous size gradient. This breakthrough enables tunable light manipulation and structural colors in advanced photonic materials.

Keywords:
colloidal self-assemblygradient size distributionlight scatteringmesoscale gradients

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Colloidal crystals and glasses are known to influence light propagation based on their structure and composition.
  • Existing research has not fully explored mesostructures with continuous property gradients within constituent particles.
  • A knowledge gap exists regarding the fabrication and properties of colloidal systems with gradual variations.

Purpose of the Study:

  • To introduce a general synthetic approach for fabricating colloidal ensembles with continuous size gradients.
  • To demonstrate the creation of photonic colloidal glasses with a top-to-bottom size gradient.
  • To explore the light-manipulating properties of these novel mesogradient structures.

Main Methods:

  • Synthesis of a dispersion with a specifically designed gradual particle size distribution.
  • Bottom-up self-assembly of the synthesized dispersion to form a colloidal glass.
  • Utilizing local and bulk characterization methods to analyze the mesostructure's properties.

Main Results:

  • Successful fabrication of a photonic colloidal glass exhibiting a continuous size gradient.
  • Observation of vivid structural colors along the gradient due to controlled light interaction.
  • Demonstration of superior light scattering properties across the entire gradient.

Conclusions:

  • The developed technique provides a general pathway for creating mesoscopic gradients in colloidal systems.
  • This approach opens avenues for novel physical insights and functionalities in particle-based materials.
  • The method is potentially transferable to various other particle systems for gradient engineering.