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Surface modification and electrostatic charge of polystyrene particles.

O E Cassidy1, G Rowley, I W Fletcher

  • 1School of Health Sciences, Pasteur Building, University of Sunderland, Sunderland, Tyne and Wear SR1 3SD, UK.

International Journal of Pharmaceutics
|May 26, 1999
PubMed
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Poloxamer adsorption modifies particle charge and handling. The extent of poloxamer adsorption on polystyrene spheres correlates with charge reduction, influenced by poloxamer properties and surface conformation.

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Colloid Science

Background:

  • Particle surface properties, such as electrostatic charge, are critical for material handling and performance.
  • Poloxamers are non-ionic surfactants with potential applications in surface modification.

Purpose of the Study:

  • To investigate the effect of poloxamer adsorption on the electrostatic charge of polystyrene particles.
  • To understand the relationship between poloxamer adsorption parameters and charge alteration.

Main Methods:

  • Adsorption isotherm studies to quantify poloxamer uptake.
  • Surface analysis techniques including X-ray photoelectron spectroscopy (XPS) and Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS).

Main Results:

Related Experiment Videos

  • Poloxamer adsorption followed a Langmuir adsorption profile on polystyrene particles.
  • A clear correlation was observed between the extent of poloxamer adsorption and the reduction in electrostatic charge.
  • Surface analysis indicated a specific adsorption mechanism involving the polypropylene oxide component and a polyethylene oxide-rich outer layer.

Conclusions:

  • Poloxamer adsorption is an effective method for modifying the surface charge of polystyrene particles.
  • The observed charge alteration is dependent on poloxamer concentration, molecular weight, and conformation at the particle surface.
  • The structure of the adsorbed poloxamer layer, with a hydrophilic outer surface, plays a key role in modifying surface charge and potentially influencing material handling properties.