resumo
In this work, we explore the mutual solubility of a number of mixtures of commonly used ionic liquids (imidazolium, pyridinium, phosphonium and ammonium ionic liquids) with partially fluorinated n-alcohols (C(7) to C(10)) or per fluoroheptane. The corresponding T-x diagrams at atmospheric pressure were measured through cloud-point temperature determinations. For some selected systems under near-critical isopleth conditions, pressure effects were also studied. The results are discussed in terms of (i) shifts in the immiscibility envelopes as the cation alkyl-chain length is changed, (ii) the nature of the cation or the anion, (iii) the increasing length of the fluorinated/alkylic moiety of the partially fluorinated alcohol, or (iv) comparisons with similar systems involving normal alcohols.
palavras-chave
ATOM FORCE-FIELD; PHASE BEHAVIOR; THERMODYNAMIC PROPERTIES; BINARY-MIXTURES; EQUILIBRIA; ALCOHOLS; HYDROFLUOROETHERS; SURFACTANTS; SYSTEMS
categoria
Chemistry; Science & Technology - Other Topics
autores
Ferreira, R; Blesic, M; Trindade, J; Marrucho, I; Lopes, JNC; Rebelo, LPN
nossos autores
Isabel Maria Delgado Jana Marrucho Ferreira
Professor CatedráticoGrupos
agradecimentos
This work was supported by the Fundacao para a Ciencia e Tecnologia (FC & T), Portugal ( POCI/QUI/57716/2004 and PTDC/CTM/73850/2006). M. B. thanks FC & T for a Ph. D. grant SFRH/BD/13763/2003. We would like to thank the QUILL team, Belfast, for the synthesis and characterization of several ionic liquids used in this work.