Phase equilibrium and physical properties of biobased ionic liquid mixtures

Author(s)

Hijo, Ariel A. C. Toledo ^[1] ; Maximo, Guilherme J. ^[1] ; Cunha, Rosiane L. ^[1] ; Fonseca, Felipe H. S. ^[2] ; Cardoso, Lisandro P. ^[2] ; Pereira, Jorge F. B. ^[3] ; Costa, Mariana C. ^[4] ; Batista, Eduardo A. C. ^[1] ; Meirelles, Antonio J. A. ^[1]

Affiliation

^[1] Univ Estadual Campinas, Sch Food Engn, R Monteiro Lobato 80, BR-13083862 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Inst Phys Gleb Wataghin IFGW, BR-13083859 Campinas, SP - Brazil

^[3] Univ Estadual Paulista, Sch Pharmaceut Sci, BR-14800903 Araraquara, SP - Brazil

^[4] Univ Estadual Campinas, Sch Chem Engn, BR-13083852 Campinas, SP - Brazil

• Document type: Journal article
• Source: Physical Chemistry Chemical Physics; v. 20, n. 9, p. 6469-6479, MAR 7 2018.
• Web of Science Citations: 5

Abstract

Protic ionic liquid crystals (PILCs) obtained from natural sources are promising compounds due to their peculiar properties and sustainable appeal. However, obtaining PILCs with higher thermal and mechanical stabilities for product and process design is in demand and studies on such approaches using this new IL generation are still scarce. In this context, this work discloses an alternative way for tuning the physicochemical properties of ILCs by mixing PILs. New binary mixtures of PILs derived from fatty acids and 2-hydroxy ethylamines have been synthesized here and investigated through the characterization of the solid-solid-{[}liquid crystal]-liquid thermodynamic equilibrium and their rheological and critical micellar concentration profiles. The mixtures presented a marked nonideal melting profile with the formation of solid solutions. This work revealed an improvement of the PILCs' properties based on a significant increase in the ILC temperature domain and the obtainment of more stable mesophases at high temperatures when compared to pure PILs. In addition, mixtures of PILs also showed significant changes in their non-Newtonian and viscosity profile up to 100 s(-1), as well as mechanical stability over a wide temperature range. The enhancement of the physicochemical properties of PILs here disclosed by such an approach leads to more new possibilities of their industrial application at high temperatures. (AU)

• FAPESP's process: 16/08566-1 - Phase equilibrium thermodynamics for the improvement of physical properties of food bioproducts and their prediction in industrial and digestive processes
• Grantee: Guilherme José Maximo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/24461-5 - Synthesis, characterization and application of ionic liquids by using fatty acids, choline and phosphoethanolamine in the food and biopharmaceuticals industries
• Grantee: Ariel Antonio Campos Toledo Hijo
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 14/16424-7 - Optimization and scale-up of liquid-liquid extraction process with ionic liquids (ILs) as a sustainable tool for the separation of the anti-leukemia biopharmaceutical L-asparaginase (ASPase)
• Grantee: Jorge Pereira
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 12/05027-1 - Solid-liquid equilibrium of fatty compounds and biodiesel flash point
• Grantee: Mariana Conceição da Costa
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Young Investigators Grants
• FAPESP's process: 14/03992-7 - Phase equilibrium thermodynamics for the comprehension and improvement of thermal and mechanical properties of lipidic biocompounds and biofuels
• Grantee: Guilherme José Maximo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 14/21252-0 - Equilibrium and production processes of biofuels and bioproducts
• Grantee: Antonio José de Almeida Meirelles
• Support Opportunities: Research Projects - Thematic Grants