Dantas, Tereza Neuma de CastroFernandes, Jéssica Emanuela de Araújo2017-03-292017-03-292016-04-25FERNANDES, Jéssica Emanuela de Araújo. Síntese de tensoativos aminados e estudo das suas influências na molhabilidade de rochas carbonáticas. 2016. 135f. Tese (Doutorado em Química) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2016.https://repositorio.ufrn.br/jspui/handle/123456789/22511In this work two cationic surfactants were synthesized, dodecylaminium chloride (DAC) and N, N-diethyldodecylaminium (NNDAC) to investigate their ability to change the of carbonate rock wettability with treatment with microemulsion systems. The surfactant characterization was carried out through infrared spectroscopy technique, melting point and critical micelle concentration values (c.m.c.). Microemulsions with high composition of active matter, aqueous and oily phase and phase were characterized by droplet diameter, surface tension, density and viscosity. The limestone and calcium carbonate used were characterised by Fourier Transform Infrared Spectroscopy, thermal analysis (TG), x-ray diffraction (XRD) and x-ray fluorescence (FRX). Microemulsion systems prepared with DAC and characterized as spherical micelles showed smaller droplet diameters compared with similar systems for the NNDAC, with values between 100 and 225 nm for the first surfactant and between 500 and 980 to the second. The salt effect caused the reduction of electrostatic interactions between the polar heads of surfactant molecules, causing the micelle packaging with lower concentration and reducing the diameters. Viscosity and surface tension results confirmed the particle size data. The systems with lower surfactant concentrations presented viscosity values in the range of 3-4.5 cP, while the systems with higher concentrations of active matter, i.e. that suggest larger structural aggregates - lamella - exhibited results between 6.5 and 7.8 cP. The characterization of inorganic substrates showed the occurrence of calcite phase and the absence of substances or contaminants that compromise the limestone used. The wettability tests showed that all treatments have reversed the carbonate rock wettability of oil wet to water wet, but the lower contact angle values were obtained through treatment with microemulsion systems formed with the NNDAC in saline media. Microemulsion systems characterized by the occurrence of lamella were the most effective to reduce the contact angle values while systems with direct micelle promoted smaller micelles wettability change.Acesso AbertoTensoativo catiônicoSal de aminaRocha carbonáticaMicroemulsãoMolhabilidadedoctoralThesisCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA