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Raman spectroscopy and in situ measurements of physico-chemical properties of ionic liquids and deep eutectic solvents.

Grant number: 23/16685-4
Support Opportunities:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): March 01, 2024
Effective date (End): February 29, 2028
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Mauro Carlos Costa Ribeiro
Grantee:Letícia Almeida Souza
Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:22/11983-4 - Spectroscopy signal enhancement: nanomaterials, theory, and computer simulation, AP.TEM

Abstract

The various applications proposed over the last two decades for ionic liquids (LIs) and deep euthetic solvents (DES) demand their characterization with thermal, reological and ionic conductivity measurements in function of temperature. Spectroscopic techniques are employed, in particular vibrational spectroscopy (Raman and infrared), for the rationalization of macroscopic properties in terms of molecular structure. However, spectroscopic measurements and basic physico-chemical properties often do not correspond to the same state of the system due to the great dependence of phase transitions on the thermal history experienced by these materials. In this project we intend to use accessories for Raman spectroscopy in which thermal and electrical measurements are made simultaneously with the recording of the spectrum. The target systems will be mainly protic ionic liquids and their euthetic mixtures in which, in addition to the conductivity due to ionic diffusion, there is also the possibility of protonic mobility in a network of hydrogen bonds.

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