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Title: Surfactant-assisted formation of organophilic CeO2 nanoparticles
Authors: Tunusoğlu, Özge
Muñoz-Espí, Rafael
Akbey, Ümit
Demir, Mustafa Muammer
Keywords: Ceria
Controlled precipitation
Rare-earth metal oxide
Redispersible nanoparticles
Surface modification
Issue Date: 5-Feb-2012
Publisher: Elsevier Ltd.
Source: Demir, M.M. Tunusoğlu, Ö., Mu˜noz-Espí, R., and Akbey, Ü. (2012). Surfactant-assisted formation of organophilic CeO2 nanoparticles. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 395, (10-17). doi:10.1016/j.colsurfa.2011.11.026
Abstract: We report a simple one-pot method to prepare organically functionalized CeO 2 nanoparticles by controlled chemical precipitation. The particles were nucleated by mixing aqueous solutions of Ce(NO 3) 3·6H 2O and ammonia at room temperature. Different small organic molecules were chosen as capping agents and injected into the reaction medium at the beginning of the synthesis: 3-(mercaptopropyl) trimethoxy silane (MPS), hexadecyltrimethyl ammonium bromide (CTAB), 3-mercapto propionic acid (3-MPA), and thioglycolic acid (TGA). The resulting nanocrystals were quasi-spherical and had a narrow mean size distribution with an average size smaller than 10nm. Dynamic nuclear polarization enhanced NMR (DNP-NMR) and FTIR measurements suggested a chemical grafting of the surfactant and a homogeneous surface modification. The colloidal stabilities were characterized by dynamic light scattering and zeta potential measurements. The stabilization by aliphatic groups was tested with a frequently used hydrophobic monomer, methyl methacrylate. According to the results, CTAB is the most effective of the used stabilizing surfactant. The mechanism of formation of the organophilic CeO 2 nanoparticles is discussed.
ISSN: 0927-7757
Appears in Collections:Chemistry / Kimya
Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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