RT Dissertation/Thesis
T1 Applications of Surface Active Ionic Liquids
A1 Rodríguez Palmeiro, Iago
K1 surfactant ionic liquids
K1 nanoparticles
K1 ionanofluids
K1 enhanced oil recovery
AB The overall objective of this thesis is to take advantage of theexistence of polar/non-polar domains in ionic liquids, specificallysurfactants, to develop new applications of these salts.Silver chloride nanoparticles were synthesised using solelythe surfactant ionic liquid trihexyl(tetradecyl)-phosphoniumchloride and AgCl bulk powder. The nanoparticles werecharacterised and tested as nanocatalysts in the photodegradationof Orange II. An almost complete degradation can be achieved, inoptimal conditions, and the nanoparticles can be recycled.The same method of synthesis was used to prepareionanofluids consisting of AgI nanoparticles in the ionic liquidtrihexyl(tetradecyl)phosphonium chloride. High concentrate andstable nanofluids were obtained and characterised. The use of thismethod, with a careful consideration in the selection of the ionicliquid and nanoparticles, allows obtaining nanofluids of enhancedproperties.The capability of 1-alkyl-3-methylimidazolium surfactantionic liquids to improve surfactant enhanced oil recovery methodswas analysed. Liquid–liquid equilibria of water + [Cnmim][NTf2] (n= 10 or 12) + n-dodecane ternary systems were measured at298.15 and 348.15 K. These systems can be classified as WinsorIII. Some drawbacks were detected to use these ionic liquids in oilrecovery. However the PC-SAFT equation of state was able topredict the equilibria. Thus, this model can be a fast and cheapinitial method for the screening of possible surfactants for thisapplication. The bistrifluoromethylsulfonylimide anion of thepreviously tested ionic liquids was changed for acetate. Thedynamic interfacial tensions between several formulations,containing the ionic liquid, and crude oil (Saharan blend) wereevaluated by the spinning drop method. The results obtainedsignificantly improve upon previous results obtained up to withother ionic liquids.Surfactant ionic liquids can be used for the synthesis ofnanoparticles and ionanofluids, and are promising alternatives toevaluate for oil recovery.
YR 2016
FD 2016
LK http://hdl.handle.net/10347/15097
UL http://hdl.handle.net/10347/15097
LA eng
DS Minerva
RD 30 abr 2026