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Related Concept Videos

The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Colloidal precipitates01:09

Colloidal precipitates

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...
Colloids and Suspensions01:17

Colloids and Suspensions

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...
Colloids03:22

Colloids

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...
Coagulation01:06

Coagulation

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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Solubilization and Bio-conjugation of Quantum Dots and Bacterial Toxicity Assays by Growth Curve and Plate Count
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Published on: July 11, 2012

Impact dynamics of colloidal quantum dot solids.

Lejun Qi1, Peter H McMurry, David J Norris

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 28, 2011
PubMed
Summary
This summary is machine-generated.

Researchers explored quantum dot solids using aerosol techniques. Densely packed nanocrystal solids transition from liquid-like splashing to granular behavior like arching.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Colloidal Science

Background:

  • Quantum dot solids are promising materials with tunable properties.
  • Understanding their mechanical behavior is crucial for applications.

Purpose of the Study:

  • To investigate the cohesive and granular properties of quantum dot solids.
  • To explore how nanocrystal packing density affects material behavior.

Main Methods:

  • Aerosol techniques were used to form spherical nanocrystal agglomerates.
  • Nanocrystal agglomerates were impacted onto a substrate at varying velocities (0.01 m/s and 100 m/s).
  • Deposit morphology was analyzed to determine mechanical properties.

Main Results:

  • A liquid-to-solid transition was observed with increasing nanocrystal packing density.
  • Low-density agglomerates showed liquid-like splashing and coalescence.
  • High-density agglomerates exhibited granular behavior, including arching and thickening.

Conclusions:

  • The mechanical properties of quantum dot solids are tunable by controlling nanocrystal spacing.
  • Aerosol deposition offers a method to study the transition from liquid-like to granular behavior in nanomaterials.