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Related Concept Videos

Colloids03:22

Colloids

17.8K
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...
17.8K
Colloidal precipitates01:09

Colloidal precipitates

723
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...
723
Colloids and Suspensions01:17

Colloids and Suspensions

2.0K
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...
2.0K

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Synthesis and Characterization of Supramolecular Colloids
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Colloidal Rod-Like Particles with Temperature-Driven Tunable Interactions.

Lucille Chambon1,2, Mohan Das1,2, Evangelia Vasilaki1,2

  • 1Department of Materials Science and Technology, University of Crete, 700 13Heraklion, Crete, Greece.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 20, 2022
PubMed
Summary
This summary is machine-generated.

Synthesized temperature-sensitive colloidal particles with grafted poly(2-(dimethylamino)ethyl methacrylate) (PDMA) show aggregation above their lower critical solution temperature (LCST). However, irreversible aggregation occurred in rod-like particles, unlike spherical ones.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Colloid Science

Background:

  • Grafting temperature-responsive polymers onto colloidal particles creates smart materials.
  • Silica rods offer unique anisotropic properties for advanced applications.
  • Polymer stability at the particle interface is crucial for material performance.

Purpose of the Study:

  • To synthesize temperature-sensitive rod-like colloidal particles.
  • To investigate the stability of grafted polymers on silica rods.
  • To explore the thermo-responsive behavior and reversibility of these anisotropic particles.

Main Methods:

  • Surface-initiated atom transfer radical polymerization to graft PDMA onto silica rods.
  • Synthesis of a barrier layer using poly(methyl methacrylate) to improve polymer stability.
  • Dynamic light scattering, microscopy, and rheological measurements to characterize particle behavior.

Main Results:

  • Successfully synthesized temperature-sensitive rod-like particles with grafted PDMA.
  • A poly(methyl methacrylate) barrier layer significantly suppressed polymer degrafting.
  • Particles aggregated above the lower critical solution temperature (LCST) of PDMA.
  • Rod-like particles exhibited irreversible aggregation, unlike spherical counterparts.

Conclusions:

  • Grafting PDMA onto silica rods yields temperature-sensitive anisotropic colloids.
  • A hydrophobic barrier layer enhances the stability of grafted polymers.
  • Irreversible aggregation in rod-like particles presents challenges for complete thermo-reversibility.