Surface Characterization of TiO2 Polymorphic Nanocrystals through 1 H-TD-NMR

Langmuir : the ACS Journal of Surfaces and Colloids
Massimo TawfilasRoberto Simonutti

Abstract

Nanocrystals (NCs) surface characterization is a fundamental step for understanding the physical and chemical phenomena involved at the nanoscale. Surface energy and chemistry depend on particle size and composition, and, in turn, determine the interaction of NCs with the surrounding environment, their properties and stability, and the feasibility of nanocomposites. This work aims at extracting more information on the surface of different titanium dioxide polymorphs using 1H-TD-NMR of water. Taking advantage of the interaction between water molecules and titanium dioxide NCs, it is possible to correlate the proton transverse relaxation times ( T2) as the function of the concentration and the specific surface area (δp· Cm) and use it as an indicator of the crystal phase. Examples of three different crystals phase, rutile, anatase, and brookite, have been finely characterized and their behavior in water solution have been studied with TD-NMR. The results show a linear correlation between relaxivity ( R2) and their concentration Cm. The resulting slopes, after normalization for the specific surface, represent the surface/water interaction and range from 1.28 g m-2 s-1 of 50 nm rutile nanocrystals to 0.52 for similar sized brookite...Continue Reading

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Citations

Aug 20, 2020·Journal of Colloid and Interface Science·Agathe FanostAnne-Laure Rollet
Jun 13, 2021·European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences·Kotaro OkadaYoshinori Onuki
Dec 27, 2019·Chemistry of Materials : a Publication of the American Chemical Society·Daniele SelliCristiana Di Valentin

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