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Related Concept Videos

Colloids03:22

Colloids

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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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Gain01:15

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Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
Gain:
Suppose Vin is the input and Vout is the output signal to a circuit.
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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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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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Properties of Enantiomers and Optical Activity02:24

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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A model for optical gain in colloidal nanoplatelets.

Qiuyang Li1, Tianquan Lian1

  • 1Department of Chemistry , Emory University , 1515 Dickey Drive, NE , Atlanta , GA 30322 , USA .

Chemical Science
|April 10, 2018
PubMed
Summary
This summary is machine-generated.

Researchers studied optical gain in cadmium chalcogenide nanoplatelets (NPLs). They found optical gain depends on NPL size and density, and developed a model explaining these properties for better lasing applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Cadmium chalcogenide nanoplatelets (NPLs) show promise for lasing due to low gain thresholds.
  • Improving NPL optical gain is limited by a lack of predictive models for gain characteristics.
  • Understanding gain dependence on NPL properties like size and density is crucial.

Purpose of the Study:

  • To systematically study optical gain (OG) in CdSe NPLs.
  • To investigate the influence of NPL lateral area and optical density on OG thresholds and saturation.
  • To develop a model for predicting NPL optical gain properties.

Main Methods:

  • Transient absorption spectroscopy of colloidal solutions.
  • Amplified spontaneous emission (ASE) measurements of thin films.
  • Development and application of a novel optical gain model.

Main Results:

  • Optical gain threshold is independent of NPL lateral area at constant optical density.
  • Saturation gain amplitude depends on NPL lateral area at constant optical density.
  • Both OG and ASE thresholds increase with optical density for constant NPL thickness and lateral area.
  • Proposed model accurately predicts observed dependences on lateral area and optical density.
  • Model indicates OG originates from bi-exciton states, with thresholds related to exciton occupation.

Conclusions:

  • The developed model provides a microscopic understanding of optical gain in NPLs.
  • Findings offer guidance for optimizing lasing performance in NPLs and other low-dimensional nanomaterials.
  • NPLs exhibit lower optical gain thresholds compared to quantum dots (QDs).