Quaternary Ammonium-based Deep Eutectic Solvents, 17th International Symposium on Solubility Phenomena and Related Equilibrium Processes 2016, Mónia A. R. Martins, Liliana P. Silva, Paula V. A. Pontes, Guilherme J. Máximo, Olga Ferreira, Simão P. Pinho, Eduardo A. C. Batista, Antonio J. A. Meirelles and João A. P. Coutinho, Geneva, Switzerland