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Related Concept Videos

Micelles01:30

Micelles

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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Precipitate Formation and Particle Size Control01:16

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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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Shape-tunable core-shell microparticles.

Matthias K Klein1, Nicolai R Saenger, Stefan Schuetter

  • 1Department of Chemistry and ‡Department of Physics, University of Konstanz , Universitätsstraße 10, 78457 Konstanz, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 22, 2014
PubMed
Summary

Researchers developed new shape-tunable polymer microparticles with polystyrene (PS) cores and poly(methyl methacrylate) (PMMA) shells. These core-shell particles can be made spherical or anisotropic, enabling long-term tracking with nonlinear optical microscopy.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Colloidal polymer particles are versatile materials with broad applications.
  • Controlling particle composition, shape, and functionality is crucial for advanced applications.
  • Existing methods for particle fabrication often lack precise shape control.

Purpose of the Study:

  • To introduce a novel class of shape-tunable core-shell microparticles.
  • To demonstrate methods for controlling particle morphology, including spherical and anisotropic shapes.
  • To explore the application of these particles in long-term tracking using advanced microscopy.

Main Methods:

  • Fabrication of cross-linked polystyrene (PS) cores.
  • Nonaqueous dispersion polymerization to create poly(methyl methacrylate) (PMMA) shells.
  • Post-fabrication treatments including thermal smoothing and thermomechanical stretching for shape manipulation.

Main Results:

  • Successfully synthesized PS/PMMA core-shell microparticles with tunable shell thickness.
  • Achieved spherical particle morphology via a tempering procedure to smooth wrinkled surfaces.
  • Generated shape-anisotropic particles using a thermomechanical stretching process.

Conclusions:

  • The developed method allows for precise control over the shape of polymer core-shell microparticles.
  • The unique composition enables selective vibrational analysis of PS and PMMA components.
  • The absence of photobleaching in nonlinear optical microscopy facilitates long-term particle tracking.