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Related Concept Videos

Colloids03:22

Colloids

20.3K
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 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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Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface
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Chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings.

Thitiporn Kaewpetch1, James F Gilchrist2,3

  • 1Polymer Science and Engineering, Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA, USA.

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This study tracks colloidal film drying using microscopy, revealing how stable and attractive colloids form distinct microstructures. Understanding these drying dynamics is key for advanced material applications.

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Area of Science:

  • Materials Science
  • Colloid Science
  • Soft Matter Physics

Background:

  • Colloidal films are vital for coatings, biomaterials, and drug delivery.
  • Controlling microstructure during film formation is crucial but challenging.
  • In-situ investigation of colloidal microstructure evolution during drying is limited.

Purpose of the Study:

  • To investigate the in-situ microstructural evolution of colloidal films during drying.
  • To differentiate microstructural changes in stable versus attractive colloidal suspensions.
  • To understand the role of drying mechanics on final film microstructure.

Main Methods:

  • Utilized high-speed laser scanning confocal microscopy to track fluorescent colloids.
  • Studied both stable and attractive colloidal suspensions during the drying process.
  • Analyzed microstructural evolution and quantified particle arrangements.

Main Results:

  • Stable colloidal suspensions exhibited continuous microstructural evolution with a lognormal Voronoi polyhedra distribution.
  • Attractive colloidal suspensions showed heterogeneous, non-monotonic microstructures due to internal convection and capillary forces.
  • The final microstructure retained evidence of the drying-induced rearrangement mechanisms.

Conclusions:

  • In-situ microscopy provides critical insights into colloidal film formation dynamics.
  • Colloid interactions significantly dictate the resulting film microstructure during drying.
  • This research advances the understanding of colloidal self-assembly for material design.