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C. Lomoschitz, B. Feichtenschlager, N. Moszner, M. Puchberger, K. Müller, M. Abele, G. Kickelbick:
"Directing Alkyl Chain Ordering of Functional Phosphorus Coupling Agents on ZrO₂";
Langmuir, 27 (2011), 7; 3534 - 3540.

ZrO₂ powder (6.6 m²/g) was modified using polymerizable phosphorus-based coupling agents (P-CAs) (i.e., phosphonic acid, phosphoric acid, and bis-phosphonic acid), resulting in densely grafted layers as determined by thermogravimetry and elemental analysis (up to 4.2 molecules/nm2). The applied P-CAs contained a methacrylate group, which led to the covalent incorporation of a polymerizable moiety into the grafted layer. To direct the ordering of the alkyl chains in the layer, three different approaches were evaluated with respect to their structure-directing ability by means of FT-IR and nitrogen sorption at 77 K: (i) variation of the chain length, (ii) variation of the anchoring group and (iii) comodification with a defined amount of a nonfunctional phosphonic acid (variation of the functional/nonfunctional acid ratio). It was shown that the chain length and anchoring group size have significant effects on the alkyl chain ordering and morphology of the layer.

http://dx.doi.org/10.1021/la104527b

Project Head Guido Kickelbick:
Untersuchung der Wechselwirkungen von Haftkomponenten mit Zirkondioxid- und Edelmetall-Oberflächen sowie Bariumgläsern