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Related Concept Videos

Colloids03:22

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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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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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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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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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pH-Dependent Foam Formation Using Amphoteric Colloidal Polymer Particles.

Sayaka Fukui1, Tomoyasu Hirai1,2, Yoshinobu Nakamura1,2

  • 1Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.

Polymers
|March 4, 2020
PubMed
Summary
This summary is machine-generated.

Amphoteric polystyrene particles with amidino and carboxyl groups were synthesized. These pH-responsive particles act as effective foam stabilizers, with unique iridescent properties observed in dried foams.

Keywords:
adsorptionbubblefoaminterfacemoiré patternpH-sensitivepolymer particle

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Polymer Chemistry

Background:

  • Amphoteric particles offer tunable surface properties for various applications.
  • Controlling particle dispersion and interfacial behavior is crucial for material stability.
  • Foam stabilization is vital in many industrial processes.

Purpose of the Study:

  • To synthesize near-monodisperse micrometer-sized polystyrene particles with both amidino and carboxyl surface groups.
  • To investigate the pH-dependent dispersion, aggregation, and foam stabilization capabilities of these amphoteric particles.
  • To characterize the morphology and optical properties of foams stabilized by these particles.

Main Methods:

  • Soap-free emulsion polymerization using an amphoteric free radical initiator.
  • Characterization via scanning electron microscopy (SEM), optical microscopy (OM), sedimentation rate, and electrophoretic measurements.
  • Evaluation of foamability and foam stability at different pH values.

Main Results:

  • Well-dispersed particles at pH 2.0 (positive) and pH 11.0 (negative) due to electrostatic repulsion; weak aggregation at pH 4.8 (neutral).
  • Effective pH-sensitive foam stabilization observed, with higher foamability and stability at pH 2.0 and 4.8.
  • Formation of hexagonally close-packed arrays of particles on bubble surfaces and iridescent character in dried foam fragments.

Conclusions:

  • Amphoteric polystyrene particles exhibit pH-dependent dispersion and aggregation behavior.
  • These particles demonstrate significant potential as pH-sensitive foam stabilizers.
  • The unique structural and optical properties of the stabilized foams warrant further investigation.