Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Poster Session III
CPP 33.11: Poster
Dienstag, 13. März 2018, 14:00–16:00, Poster C
Orientation of Halloysite nanotubes embedded in a polymer matrix — •Oliver Löhmann1, Olivier Felix2, Yuri Lvov3, Gero Decher2, and Regine von Klitzing1 — 1Technische Universität Darmstadt — 2Institut Charles Sadron — 3Louisiana Tech University
Halloysites are inorganic, biocompatible nanotubes consisting of alumosilcates with a length of 0.5 - 2 microns and a diameter of 50 - 80 nm. [1] The surface of the inner lumen is predominated by alumina with a positive surface charge and therefore available for adsorption and protection of small molecules. The nanotubes have an overall negative surface potential at moderate pH due to predomination of silica at the outside. That opens the possibility to embed them into positively charged polyelectrolytes. Zhao et al. showed that Halloysites orientate parallel to each other at the liquid-substrate contact line during solvent evaporation. [2] Based on this we built up multilayers of orientated halloysite over a larger area by controlled spraying method.
Here, we show that halloysites can be orientated by gracing incident spray coating. [3] Multilayers of Halloysites and polyelectrolytes are built up by alternating spray coating. Topology as well as mechanical properties of composites with different layer numbers and compositions measured with Atomic force microscopy will be presented.
[1] Lvov et al., Prog Polym Sci 38 (2013) 1690 - 1719
[2] Zhao et al., J Colloid Interf Sci 440 (2015) 68 - 77
[3] Blell et al., ACS Nano 11 (2017) 84 - 94