Fraunhofer Institute for
Applied Polymer Research IAP
Fraunhofer Institute for
Applied Polymer Research IAP

Molecular and colloid chemical characterization

Particle size analysis (PG)

Analyte

  • Polymers, colloids and nanoparticles in solutions (aqueous and organic solutions)
  • Particle sizes
  • Size range: 0.1 nm – 2000 µm
  • Concentration range: 0.001 – 40 %

 

Equipment

  • Delsa Nano +C (Beckman Coulter)
  • Zetasizer Nano (Malvern)
  • Zetamaster S (Malvern)
  • BI-90 (Brookhaven)
  • Mastersizer X (Malvern)
  • Particle sizer LS 13320 (Beckman Coulter)
  • AS 200, Retsch company, dry and wet sieving

 

Target

  • Determination of diffusion coefficient and hydrodynamic radius by means of dynamic light scattering
  • Mathematical determination of particle sizes by cumulate, contin, Marquardt and NNLS methods
  • Determination of intensity, volume and number distribution functions
  • Particle size distribution of nano- and microparticles

 

Application

  • Determination of the hydrodynamic radius of polymers and polyelectrolytes as a function of solvent, electrolyte content and pH value
  • Investigation of symplex formation between cationic starch and anionic polyelectrolytes
  • Derivations concerning the property profile of polymer dispersions (viscosity, sedimentation / flotation etc.)

 

Measuring method

  • Investigations concerning the symplex formation between cationic starch and anionic polyelectrolytes (see PDF)
  • R. H. Müller / R. Schumann, Teilchengrößenmessung in der Laborpraxis, apv-Paperback, Volume 38, Wiss. Verlagsgesellschaft Stuttgart, 1996

 

Methods of comparison and supplementation

  • Electron microscopy