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Autor

  • Borcherding, H. (2)
  • Dietrich, Paul (2)
  • Hennig, Andreas (2)
  • Resch-Genger, Ute (2)
  • Schedler, U. (2)
  • Thiele, T. (2)
  • Unger, Wolfgang (2)
  • Hemmann, Felix (1)
  • Hoffmann, Angelika (1)
  • Holzweber, Markus (1)
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Erscheinungsjahr

  • 2015 (1)
  • 2014 (1)

Schlagworte

  • SEM (2)
  • Surface analysis (2)
  • XPS (2)
  • Beads (1)
  • Fluorescent dye labeling (1)
  • Fluorine labeling (1)
  • NEXAFS (1)
  • NMR (1)
  • Poly(acrylic acid)-grafted microparticles (1)
  • Poly(acrylic acid)-grafted particles (1)
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Organisationseinheit der BAM

  • 6.1 Oberflächenanalytik und Grenzflächenchemie (2) (entfernen)

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Surface analytical study of poly(acrylic acid)-grafted microparticles (beads): characterization, chemical derivatization, and quantification of surface carboxyl groups (2014)
Dietrich, Paul ; Hennig, Andreas ; Holzweber, Markus ; Thiele, T. ; Borcherding, H. ; Lippitz, Andreas ; Schedler, U. ; Resch-Genger, Ute ; Unger, Wolfgang
We report a surface analytical study of poly(methyl methacrylate) (PMMA) microparticles (beads) with a grafted shell of poly(acrylic acid) (PAA) with thicknesses up to 4 nm using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and near-edge X-ray adsorption fine structure (NEXAFS) spectroscopy. These polymer microparticles were analyzed before and after reaction of the surface carboxyl (CO2H) groups with 2,2,2-trifluoroethylamine (TFEA) to gain a better understanding of methods with use of covalently bound probe molecules for surface group analysis. The results obtained with chemical derivatization XPS using TFEA are discussed in terms of surface quantification of reactive CO2H groups on these PAA-coated microparticles. A labeling yield of about 50% was found for TFEA-derivatized particles with amounts of surface-grafted CO2H groups of 99 µmol/g or more, which is consistent with predicted reaction yields for homogeneously dispersed PAA hydrogels.
En route to traceable reference standards for surface group quantifications by XPS, NMR and fluorescence spectroscopy (2015)
Hennig, Andreas ; Dietrich, Paul ; Hemmann, Felix ; Thiele, T. ; Borcherding, H. ; Hoffmann, Angelika ; Schedler, U. ; Jäger, Christian ; Resch-Genger, Ute ; Unger, Wolfgang
The fluorine content of polymer particles labelled with 2,2,2-trifluoroethylamine was reliably quantified with overlapping sensitivity ranges by XPS and solid-state NMR. This provides a first step towards reference materials for the metrological traceability of surface group quantifications. The extension of this concept to fluorescence spectroscopy is illustrated.
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