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- Phase transfer of TiO2 nanoparticles from water to ionic liquid triggered by phosphonic acid grafting doi link

Auteur(s): Bhandary R., Alauzun J. G., Hesemann Peter, Stocco A., In M., Mutin P. Hubert

(Article) Publié: Soft Matter, vol. 13 p.8023 - 8026 (2017)


Ref HAL: hal-01653105_v1
DOI: 10.1039/c7sm01424d
WoS: 000415352100002
Exporter : BibTex | endNote
11 Citations
Résumé:

Controlling the interface between TiO2 nanocrystals and ionic liquids is of high fundamental and applied interest for energy storage and conversion devices. Phase transfer of nanoparticles from a synthesis medium to a processing or an application medium plays a significant role in nanotechnology. Here we demonstrate that surface modification with phosphonic acids bearing cationic end-groups can trigger the phase transfer of TiO2 nanoparticles from an aqueous sol to a typical water-immiscible ionic liquid, [Emim][NTf2]. The transfer involves both the grafting of the phosphonic acid moiety and the exchange of the counter ion of the cationic end-group by NTf2 anions, as demonstrated by solid-state NMR, elemental analysis and independent grafting and ion exchange experiments. Furthermore, the colloidal stability of the TiO2 sols in [Emim][NTf2] strongly depends on the hydrophobic character of the cationic end-groups.