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Characterization of Titanium Dioxide Nanoparticles Dispersed in Organic Ligand Solutions by Using a Diffusion‐Ordered Spectroscopy‐Based Strategy
Author(s) -
Van Lokeren Luk,
Maheut Géraldine,
Ribot François,
Escax Virginie,
Verbruggen Ingrid,
Sanchez Clément,
Martins José C.,
Biesemans Monique,
Willem Rudolph
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200601722
Subject(s) - nanoparticle , titanium dioxide , acetonitrile , titanium , acetylacetone , chemistry , nuclear magnetic resonance spectroscopy , spectroscopy , analytical chemistry (journal) , materials science , inorganic chemistry , organic chemistry , nanotechnology , physics , quantum mechanics , metallurgy
Diffusion‐ordered NMR spectroscopy (DOSY NMR) is presented as a tool for the determination of the diffusion coefficients of organic ligands in suspensions of titanium dioxide nanoparticles. The nanoparticles were prepared by a sol‐gel process by hydrolysis and condensation reactions of titanium tetra‐ n ‐butoxide in the presence of pentane‐2,4‐dione (acacH: acetylacetone), as well as para ‐toluenesulfonic acid ( p TsA) and n ‐butanol ( n BuOH). NMR spectroscopic studies were performed in various deuterated solvents, on both dispersed xerosols and diluted sols. The bipolar‐pulsed field gradient longitudinal eddy‐current delay (LED) pulse sequence was used for data acquisition. The data were processed by inverse Laplace transformation (ILT), by using a maximum entropy algorithm, to afford 2D DOSY spectra. Different diffusion regimes for organic ligands in the bound and unbound states were successfully discriminated, more particularly in [D 3 ]acetonitrile, thus allowing assessment of their interactions with the nanoparticles.