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Related Concept Videos

Colloids03:22

Colloids

17.2K
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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Pinching-off of Coated Vesicles01:32

Pinching-off of Coated Vesicles

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Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
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Colloids and Suspensions01:17

Colloids and Suspensions

3.4K
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...
3.4K
Colloidal precipitates01:09

Colloidal precipitates

5.7K
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...
5.7K
The Colloidal State01:29

The Colloidal State

184
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...
184

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Compact Quantum Dots for Single-molecule Imaging
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Colloidal Multi-Dot Nanorods.

Gryphon A Drake1, Logan P Keating1, Conan Huang1

  • 1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

Journal of the American Chemical Society
|March 22, 2024
PubMed
Summary
This summary is machine-generated.

Colloidal nanorod heterostructures with multiple quantum dots (n-DNRs) were synthesized using alternating CdSe and CdS segments. These nanorods show tunable optical properties and increased photoluminescence quantum yield after doping.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Dot Research

Background:

  • Colloidal nanorod heterostructures offer tunable optoelectronic properties.
  • Controlling quantum dot morphology within nanorods is challenging.
  • Understanding electron occupation effects is crucial for device applications.

Purpose of the Study:

  • To synthesize colloidal nanorod heterostructures (n-DNRs) with controlled quantum dot segments.
  • To investigate the influence of synthesis parameters on nanorod morphology.
  • To explore electron occupation effects on the optical properties of n-DNRs.

Main Methods:

  • Solution heteroepitaxy for synthesizing alternating CdSe/CdS segments.
  • Exploiting reaction temperature, ripening, and lattice anisotropy to control QD morphology.
  • Unidirectional and bidirectional growth regimes for controlled n-DNR synthesis.

Main Results:

  • Successfully synthesized n-DNRs with varying numbers of quantum dots.
  • Demonstrated control over quantum dot segment morphology (length, diameter).
  • Observed color changes and increased photoluminescence quantum yield in asymmetric 2-DNRs upon doping.

Conclusions:

  • Colloidal nanorod heterostructures can be precisely engineered.
  • Synthesis parameters offer control over nanorod morphology and quantum dot arrangement.
  • Photochemical doping significantly impacts the optical properties of n-DNRs, particularly photoluminescence quantum yield.