Aqueous chemical grafting of modified-PEG onto maghemite nanoparticles: Influence of grafting conditions
Claire-Hélène Brachais
1
/
Ling Hu
2*
/ Diana Hach
1
/ Denis Chaumont
2
/ Aurélien Percheron
2
/ Jean-Pierre Couvercelle
1
1Synthèses Hybrides Multifonctionnels (SYMS), Institut de Chimie Moléculaire de l’Université de Bourgogne, ICMUB, CNRS UMR 5260, Université de Bourgogne, 9 Avenue Alain Savary, BP 47870 21078 DIJON Cedex, France.
2*Groupe d’Etudes et de Recherches sur les Microondes (GERM), Institut Carnot de Bourgogne, ICB, CNRS UMR 5209, Université de Bourgogne, 9 Avenue Alain Savary, BP47870 21078 DIJON Cedex, France; e-mail: hlfly510@hotmail.com
2Groupe d’Etudes et de Recherches sur les Microondes (GERM), Institut Carnot de Bourgogne, ICB, CNRS UMR 5209, Université de Bourgogne, 9 Avenue Alain Savary, BP47870 21078 DIJON Cedex, France
Cite as: Claire-Hélène Brachais, Ling Hu, Diana Hach, Denis Chaumont, et al.
Aqueous chemical grafting of modified-PEG onto maghemite nanoparticles: Influence of grafting conditions, nano Online. (2016). DOI: https://doi.org/10.1515/nano.0013.00061
Cite as: Claire-Hélène Brachais, Ling Hu, Diana Hach, Denis Chaumont, et al..
Aqueous chemical grafting of modified-PEG onto maghemite nanoparticles: Influence of grafting conditions, e-Polymers. 10, 1436 (2010). DOI: https://doi.org/10.1515/epoly.2010.10.1.1436
Abstract
The synthesis of maghemite nanoparticles coated with triethoxysilanemonomethylether-PEG (Si-mPEG), is presented in aqueous conditions, by the “grafting to” process. This procedure is performed in one step, starting from anchored polymer and native nanoparticles. The maghemite nanoparticles obtained were first identified by XRD and the average diameter is about 10 nm according to the Nitrogen adsorption, XRD and TEM techniques. The nature of the catalysts (acetic acid, triethylamine, NH4OH and dibutyl-tin-dilaurate) used for the establishment of the covalent bond between the γ-Fe2O3 particles and the SimPEG, as well as the influence of the temperature and the reaction time, were evaluated on the grafting rate of the particles in water by TGA and FTIR techniques. Using the size exclusion chromatography, SEC technique, we showed that the monomethoxy-PEG was resistant to mild acidic up to strong basic conditions. The best ratio “time/amount of polymer” for the highest grafting rate was the use of tinbased organometallic compound (DBTL) at 80 °C during 48 h. In these conditions, a grafting rate of 54 % is achieved.
