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Related Concept Videos

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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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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In Vitro Growth of Mouse Preantral Follicles Under Simulated Microgravity
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Microgravity Removes Reaction Limits from Nonpolar Nanoparticle Agglomeration.

Andrea Pyttlik1, Björn Kuttich1, Tobias Kraus1,2

  • 1Structure Formation, INM Leibniz-Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|October 10, 2022
PubMed
Summary
This summary is machine-generated.

Microgravity significantly enhances nanoparticle agglomeration. Gold nanoparticles formed larger clusters in microgravity compared to Earth, indicating a shift towards diffusion-limited aggregation.

Keywords:
diffusion-limited agglomerationdynamic light scatteringmicrogravitynanoparticlesreaction-limited agglomeration

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Fluid Dynamics

Background:

  • Gravity influences nanoparticle behavior, affecting convection and sedimentation.
  • Understanding nanoparticle agglomeration is crucial for various applications.

Purpose of the Study:

  • To investigate the effect of microgravity on temperature-induced agglomeration of gold nanoparticles.
  • To compare nanoparticle agglomeration in microgravity versus standard gravity (1 g).

Main Methods:

  • Hexadecanethiol-capped gold nanoparticles (13 nm) dispersed in tetradecane.
  • Rapid cooling from 70°C to 10°C to induce agglomeration.
  • Observation using dynamic light scattering with 1-second time resolution at the ZARM drop tower.

Main Results:

  • Agglomerates formed in microgravity were 3-5 times larger than those formed on Earth after 8 seconds.
  • The difference in size was more pronounced at higher initial nanoparticle concentrations.

Conclusions:

  • Microgravity conditions promote faster and more extensive nanoparticle agglomeration.
  • The agglomeration process in microgravity approaches the diffusion-limited regime, unlike on Earth where it is closer to the reaction-limited regime.