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Related Concept Videos

Colloids03:22

Colloids

20.2K
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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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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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...
2.8K

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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Bidisperse Nanospheres Jammed on a Liquid Surface.

Yige Gao1, Paul Y Kim2, David A Hoagland1

  • 1Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States.

ACS Nano
|August 19, 2020
PubMed
Summary

Researchers studied jammed packings of bidisperse nanospheres on liquid surfaces. Optimal size ratios around 1.5 minimize order, creating uniform nanoparticle monolayers for liquid interface technologies.

Keywords:
condensed matterelectron microscopyinterfacial jammingionic liquidnanoparticles

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Assembling uniform nanoparticle monolayers is crucial for advanced liquid interface technologies.
  • Understanding particle interactions and packing behavior at the nanoscale is essential for controlling material properties.

Purpose of the Study:

  • To investigate the formation and properties of jammed packings of bidisperse nanospheres on a liquid surface.
  • To determine the influence of size ratio and composition on the structural order and mixing of nanoparticle monolayers.

Main Methods:

  • Utilized in situ scanning electron microscopy to visualize single nanospheres.
  • Assembled PEGylated silica nanospheres with varying number fractions and size ratios on a nonvolatile liquid surface.
  • Assessed local order and degree of mixing using standard metrics on nanometer-resolution images.

Main Results:

  • Achieved reproducible formation of uniform nanoparticle monolayers with sufficient in-plane mobility prior to jamming.
  • Identified an optimal large-to-small size ratio of approximately 1.5 for equimolar mixtures, minimizing correlated orientational and positional order.
  • Observed clustering of similarly sized spheres at size ratios above 2 due to structural and depletion interactions, despite overall monolayer uniformity.

Conclusions:

  • Key design principles for creating uniform nanoparticle monolayers with high packing disorder were outlined.
  • Experimental findings support and buttress extensive theoretical and simulation literature on bidisperse disk jamming.
  • The study provides insights into controlling nanoparticle assembly for applications in liquid interface technologies.