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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

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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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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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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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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Pore Size Distribution01:23

Pore Size Distribution

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

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Core-shell colloidal particles with dynamically tunable scattering properties.

Guangnan Meng1, Vinothan N Manoharan, Adeline Perro

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA.

Soft Matter
|September 14, 2017
PubMed
Summary

Researchers developed tunable core-shell particles that change their light scattering properties with temperature or salt concentration. These smart materials could be used for optical switches and filters.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optics

Background:

  • Core-shell particles offer unique optical properties.
  • Stimuli-responsive polymers enable dynamic material behavior.
  • Controlling light scattering is crucial for optical applications.

Purpose of the Study:

  • To design and characterize polystyrene-poly(N'-isopropylacrylamide-co-acrylic acid) core-shell particles.
  • To investigate the tunable scattering properties of these particles in response to environmental stimuli.
  • To explore potential applications in optical switching and filtering.

Main Methods:

  • Synthesis of core-shell particles via emulsion polymerization.
  • Characterization of particle morphology and composition.
  • Measurement of light scattering properties (scattering cross-section, anisotropy) under varying temperature and salt concentrations.

Main Results:

  • Particles exhibit dynamically tunable scattering, transitioning from Rayleigh to Mie scattering regimes.
  • Scattering cross-section and forward scattering increase with temperature and salt concentration.
  • The degree of scattering change is controllable via solvent conditions and core size.

Conclusions:

  • The designed core-shell particles demonstrate tunable optical properties.
  • These particles can function as responsive optical elements.
  • Potential applications include tunable optical switches and filters with adjustable opacity.