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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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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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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 precipitates01:09

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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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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
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Mix-and-Melt Colloidal Engineering.

Theodore Hueckel1, Stefano Sacanna1

  • 1Molecular Design Institute, Department of Chemistry , New York University , 29 Washington Place , New York , New York 10003 , United States.

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|April 3, 2018
PubMed
Summary
This summary is machine-generated.

Mix-and-melt reactions (MMR) enable rapid, large-scale production of anisotropic core-shell colloids. This method allows modular control over particle shape and surface chemistry for advanced materials synthesis.

Keywords:
anisotropic colloidscore−shellpatchy particlesself-assemblyshape-changing

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Area of Science:

  • Colloid and interface science
  • Materials chemistry
  • Nanotechnology

Background:

  • Bottom-up self-assembly of smart colloidal particles is crucial for meta-materials.
  • Current methods for synthesizing well-defined particles are time-consuming and yield restrictive amounts.

Purpose of the Study:

  • To develop a rapid and scalable synthetic methodology for anisotropic core-shell colloids.
  • To enable modular control over particle properties through systematic core and shell manipulation.

Main Methods:

  • Mix-and-melt reactions (MMR) involving aggregation and reconfiguration of polystyrene shell particles onto core substrates.
  • Systematic variation of core and shell components and their size ratios.
  • Surface Evolver simulations to model shape evolution.

Main Results:

  • MMR allows for rapid prototyping and mass production of anisotropic core-shell colloids.
  • Particle size ratio influences shell thickness, aspect ratio, and access to specific shapes like tetrahedra.
  • Mixed shell systems create regular surface patches through a compartmentalization mechanism.

Conclusions:

  • MMR offers a versatile and efficient approach for synthesizing tailored anisotropic core-shell particles.
  • This methodology facilitates the modular design of particles for advanced meta-materials.
  • The findings provide a pathway for scalable production of functional colloidal building blocks.