Jakub Haberko oral presentation (RM-Thu2-2-4)
Core-shell polymer microspheres – depth profiling using cluster ions and XPS
1 AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. A. Mickiewicza 30, 30-059 Krakow, Poland
2 Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Krakow, Poland
3 Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, H. Sienkiewicza 112, 90-363 Lodz, Poland
4 The Marian Smoluchowski Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Krakow, Poland
Argon gas cluster ion beams (Ar-GCIB) have proven to be a powerful tool in depth profiling of organic materials. Their superiority with respect to monoatomic ions relies on the fact that the energy of the projectile is deposited close to the sample surface and that they introduce considerably less damage to the chemical structure of the studied materials.
In this work we combine Ar-GCIB with X-Ray Photoemission Spectrometry, which allows us to determine accurate chemical composition of organic samples and to verify how this composition changes as a function of the analysis depth. We present polymer microspheres consisting of a copolymer with a polystyrene (PS) and polyglycidol (PGL)-derivative moieties [1-2]. The microspheres possess a core-shell geometry with a PS-rich core and the outer later enriched in PGL. The difference in the chemical compositions means that these regons can readily be identified via XPS/Ar-GCIB. We compare different fabrication routes and try to pin-point how the synthesis details influence the final morphology of the spheres and specifically the amount of PGL moiety in the outer shell. The PGL derivative is hydrophilic, which renders the microspheres compatible with polar solvents. At the same time the ability to tune the content of PS allows to change the microspheres' properties, e.g. their refractive index.
 M. Gosecka et al. Coll. Surf. A. 507, 2016, 200
 M. Gosecki et al. Polymers 8, 2016, 227