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Related Concept Videos

Colloids03:22

Colloids

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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Liquid marbles prepared from pH-responsive sterically stabilized latex particles.

Syuji Fujii1, Motomichi Suzaki, Steven P Armes

  • 1Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Osaka 535-8585, Japan. s.fujii@chem.oit.ac.jp

Langmuir : the ACS Journal of Surfaces and Colloids
|June 3, 2011
PubMed
Summary

Stable liquid marbles were created using pH-responsive polystyrene particles. Their integrity depends on pH, with alkaline conditions ensuring long-term stability due to particle interactions.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Submicrometer-sized polystyrene (PS) latex particles with pH-responsive properties are crucial for advanced material applications.
  • Sterically stabilized particles offer enhanced colloidal stability in various media.

Purpose of the Study:

  • To synthesize and characterize pH-responsive polystyrene latex particles using a poly[2-(diethylamino)ethyl methacrylate]- (PDEA-) based macroinitiator.
  • To investigate the formation and stability of liquid marbles prepared from these particles across a range of pH values.

Main Methods:

  • Dispersion polymerization in isopropyl alcohol to synthesize PDEA-PS latex particles.
  • Characterization using particle size distribution, morphology, chemical composition, and pH-responsive behavior analysis.
  • Liquid marble preparation by rolling water droplets on dried latex powder and stability testing under varying pH conditions.

Main Results:

  • Successfully synthesized submicrometer-sized, pH-responsive PDEA-PS latex particles.
  • Prepared stable millimeter- and centimeter-sized liquid marbles with aqueous volumes from 15 μL to 2.0 mL.
  • Demonstrated that liquid marble stability is pH-dependent, with superior integrity at alkaline pH (≥ 8) correlating to the PDEA stabilizer's pKa (7.3).

Conclusions:

  • PDEA-PS latex particles are effective for creating stable liquid marbles.
  • Liquid marble stability is directly linked to the pH-responsive nature of the stabilizing polymer chains.
  • The findings provide insights into designing responsive colloidal systems for controlled applications.