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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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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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Growing a particle-stabilized aqueous foam.

Andrew T Tyowua1, Bernard P Binks2

  • 1Department of Chemistry and Biochemistry, University of Hull, Hull HU6 7RX, UK; Applied Colloid Science and Cosmeceutical Group, Department of Chemistry, Benue State University, PMB 102119, Makurdi, Nigeria.

Journal of Colloid and Interface Science
|December 9, 2019
PubMed
Summary
This summary is machine-generated.

Heating gas-filled colloidal particles expands aqueous foams. This study demonstrates that temperature-induced particle expansion leads to significant foam growth, creating ultra-stable foams upon cooling.

Keywords:
AdsorptionBubble coalescenceBubble coarseningContact angleCreamingDrainageFoamFoam growthSurface tensionWetting

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Foam technology

Background:

  • Certain gas-filled colloidal particles exhibit thermal expansion.
  • Surface-active particles can stabilize aqueous foams.
  • The relationship between particle expansion and foam stability is not well understood.

Purpose of the Study:

  • To investigate if aqueous foams stabilized by heat-expanding particles grow with increasing temperature.
  • To determine the effect of particle expansion on foam volume and stability.

Main Methods:

  • Aqueous foams were stabilized using hollow, heat-expanding micro-spherical particles.
  • Foams were prepared by aerating water with particles at various temperatures (40-85 °C).
  • Two preparation methods were employed: pre-heating water before aeration and heating foam post-aeration.

Main Results:

  • Foam volume increased with temperature, correlating with particle expansion starting at 60 °C.
  • Pre-soaking particles in hot water (80 °C) before aeration enhanced foam growth.
  • Foams exhibited remarkable stability, retaining their volume for over six months after cooling.

Conclusions:

  • Temperature-induced expansion of colloidal particles effectively increases aqueous foam volume.
  • The preparation method, specifically pre-heating particles, can optimize foam growth.
  • These heat-responsive, expanding particles can create ultra-stable aqueous foams.