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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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 the...
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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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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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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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Related Experiment Video

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Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
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Surface modification for polystyrene colloidal particles with controlled charge densities.

Jongman Lee1, Oh-Sun Kwon, Kwanwoo Shin

  • 1Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea.

Journal of Nanoscience and Nanotechnology
|December 1, 2007
PubMed
Summary

Polystyrene sulfonated acid (PSSA) and poly(styrene-ran-acrylic acid) (PSAA) adsorb onto polystyrene (PS) particles. Increasing charged segments enhances adsorption, improving surface charge distribution and particle dispersion stability.

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Area of Science:

  • Polymer Science
  • Surface Chemistry
  • Colloid Science

Background:

  • Polystyrene (PS) particles are widely used in various applications.
  • Controlling surface properties of PS particles is crucial for their performance.
  • Adsorption of charged polymers can modify particle surfaces.

Purpose of the Study:

  • To investigate the adsorption of polystyrene sulfonated acid (PSSA) and poly(styrene-ran-acrylic acid) (PSAA) onto PS particles.
  • To understand the effect of charged segments on adsorption behavior and particle properties.
  • To achieve well-distributed surface charge density on PS particles.

Main Methods:

  • Utilizing a swelling-quenching process with THF-water mixed solvents.
  • Employing aqueous dispersions for adsorption and characterization.
  • Measuring electrophoretic mobility and zeta-potential to assess surface charge.

Main Results:

  • Significant adsorption of PSSA and PSAA onto PS particles was achieved.
  • Functional PSSA groups were found to be randomly and tightly adsorbed.
  • Increased mol.% of charged segments led to enhanced adsorption and higher electrophoretic mobility and zeta-potential.

Conclusions:

  • The swelling-quenching process effectively adsorbs PSSA and PSAA onto PS particles.
  • Adsorption density and surface charge distribution are controllable by adjusting charged segment content.
  • This method allows for the creation of PS particles with well-defined surface charges for improved dispersion stability.