Prado, Luís Antônio Sanchez de AlmeidaLuís Antônio Sanchez de AlmeidaPradoSriyai, MontiraMontiraSriyaiGhislandi, MarcosMarcosGhislandiBarros-Timmons, AnaAnaBarros-TimmonsSchulte, KarlKarlSchulte2018-12-122018-12-122010-09-02Journal of the Brazilian Chemical Society 12 (21): 2238-2245 (2010-01-01)http://tubdok.tub.tuhh.de/handle/11420/1926In the present paper we describe the surface modification of alumina nanoparticles using epoxy-containing alkoxysilanes (silane coupling agents, SCA). The materials were characterized using infrared spectroscopy and solid-state nuclear magnetic resonance. Whereas, neat alumina nanoparticles could be expectedly modified with the afore mentioned SCA, as evidenced by 13C CPMAS NMR, the presence of arylsulphonates at the surface of alumina caused the ringopening polymerization of the epoxide. This polymerization reaction facilitated the surface modification of alumina by the SCA. X-ray powder diffraction and 27Al MAS NMR clearly demonstrated that in spite of the SCA polymerization, there were neither structural changes nor phase transitions in the alumina after the surface modification. The surface modification decreased the thermal stability of alumina, in comparison to pristine alumina nanoparticles. © 2010 Sociedade Brasileira de Química.en1678-479020101222382245Sociedade Brasileira de Química, SBQhttps://creativecommons.org/licenses/by-nc/4.0/aluminasurface functionalizationstructure-properties relationshipthermal stabilityChemieJournal Articleurn:nbn:de:gbv:830-882.02462810.15480/882.192311420/192610.1590/S0103-5053201000120001010.15480/882.1923Other