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Related Concept Videos

Colloids03:22

Colloids

21.8K
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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The Colloidal State01:29

The Colloidal State

45
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...
45
Colloids and Suspensions01:17

Colloids and Suspensions

3.7K
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...
3.7K
Colloidal precipitates01:09

Colloidal precipitates

6.6K
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...
6.6K
Micelles01:30

Micelles

78
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
78
Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

1.8K
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...
1.8K

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Colloidal capsules: nano- and microcapsules with colloidal particle shells.

Tobias Bollhorst1, Kurosch Rezwan1, Michael Maas1

  • 1Advanced Ceramics, Department of Production Engineering & MAPEX Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany. bollhorst@uni-bremen.de.

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Colloidal particles enable the creation of advanced nano- and microcapsules with tunable properties. This review details synthesis methods for these functional materials, advancing applications in engineering and medicine.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Colloidal particles offer a versatile platform for constructing nano- and microcapsule shells.
  • Integrating diverse building blocks into capsule shells yields novel material properties.

Purpose of the Study:

  • To provide a comprehensive review of synthesis strategies for colloidal capsules.
  • To discuss the progress and applications of these capsules in various scientific fields.

Main Methods:

  • Pickering-emulsion based formation
  • Colloidal particle deposition on templates
  • Amphiphilicity driven self-assembly
  • Nanoparticle membrane-loading of liposomes and polymersomes

Main Results:

  • Categorization of synthesis routes into four major themes.
  • Discussion of micro- and nano-scaled colloidal capsule research.
  • Highlighting biological applications including drug delivery and theranostics.

Conclusions:

  • Colloidal capsules are nearing practical application across multiple disciplines.
  • Advancements in synthesis are crucial for unlocking their full potential.
  • Biological applications show significant promise for pharmaceutical and medical uses.