Degree: Master

Affiliation(s):

FCUP

Bio

My name is Carlos Filipe Pesqueira miranda and I have a Bachelor's and Master's degree in Chemistry by the Faculdade de Ciências da Universidade do Porto which were completed in 2017 and 2019, respectively. Currently, I am in the final year of a PhD in Chemistry in Faculdade de Ciências da Universidade do Porto under the supervision of Prof. Luís M. N. B. F. Santos. I was awarded with a FCT PhD Research Grant (ref. 2020.05717.BD). My Bachelor´s Degree project was on the development and optimization of electrodes for the quantification of potassium in cofee samples. After graduating I started to focus on the study of thermodynamic and physicochemical properties of ionic liquids by working in Prof. Luís M. N. B. F. Santos group. My Master thesis was focused on the phase behaviour/diagrams of binary mixtures of ionic liquids, as well as on the impact of certain structural effects on the physocohemical properties of ionic liquids such as, heat capacity, thermal stability, vaporization and solid-liquid equilibrium.

My PhD thesis "Impact of Ionic Structure of the Transport Properties of Ionic Liquids" is focused on the systematic study of the dynamic viscosity and electrical conductivity of several ionic liquids with the aim of estabilishing structure-property relations (cation, anion, alkylchain and isomerization effects). My PhD work also involved the design and development of a measuring system for the measurement of electrical conductivity of ionic fluids.


Projects
This CIQUP member does not yet have any projects linked with him.
Publications
Total 2 publications.
1. C2 methylation effect on the cohesive interaction of trifluoromethanesulfonate alkylimidazolium ionic liquidC2 methylation effect on the cohesive interaction of trifluoromethanesulfonate alkylimidazolium ionic liquids, Miranda, CFP Ferreira, AIMCL Santos, LMNBF in JOURNAL OF MOLECULAR LIQUIDS, 2022, ISSN: 0167-7322,  Volume: 353, 
Article,  Indexed in: crossref, scopus, wos  DOI: 10.1016/j.molliq.2022.118772 P-00W-6J5
Abstract This work presents the effect of methylation in the C2 position of the imidazolium in the cohesive interaction of trifluoromethanesulfonate ionic liquids (ILs). The effect of C2 methylation was evaluated and analyzed by comparison between the C2-methylated and C2-protonated analogues. It was found that the nature of the anion has a strong impact on the differentiation of the effect of the C2-methylation. While strong-coordinating and smaller anions promote the hydrogen bonding interaction with the acidic hydrogen at the C2 position of the imidazolium ring, for the case of a weak-coordinating and larger anions, the C2-methylation is expected to have a dominant contribution in the decrease of the liquid entropy, associated with the decrease of the anion-around-cation dynamics due to the presence of the bulkier methyl group (-CH3) in the position 2. The volatility, heat capacities, thermal stability, and phase behavior are presented for two ionic liquids methylated at the C2 position of imidazolium ring [(1)C(2)(2)C(1)(3)C(1)im][OTf] and [(1)C(4)(2)C(1)(3)C(1)im][OTf], and their. C2-protonated analogues [(1)C(2)(3)C(1)im][OTf] and [(1)C(4)(3)C(1)im][OTf]. It was found that the C2 methylation has a quite low impact on the volatility, due to an enthalpic - entropic compensation effect. However, the derived thermodynamic properties indicate a decrease of enthalpy and entropy of vaporization with the methylation at the C2 position, which is consistent with the existence of hydrogen bond interactions in the. C2-protonated [OTf]-based ILs. The methylation at position 2 of the imidazolium leads to an increase in the melting temperature. This effect is especially significant between [(1)C(2)(3)C(1)im][OTf] and [(1)C(2)(2)C(1)(3)C(1)im] [OTf] with an increase of 125 K in melting temperature. The experimental results suggest that this behavior is associated with an increase of enthalpy of fusion due to the substitution of the hydrogen at the C2 position by the bulkier methyl group (-CH3).
2. Volatility Study of Amino Acids by Knudsen Effusion with QCM Mass Loss Detection, Stejfa, V; Pokorny, V; Miranda, CFP Fernandes, OOP; Santos, LMNBF in CHEMPHYSCHEM, 2020, ISSN: 1439-4235,  Volume: 21, 
Article,  Indexed in: crossref, scopus, wos  DOI: 10.1002/cphc.202000078 P-00R-ZM2
Abstract This work presents a new Knudsen effusion apparatus employing continuous monitoring of sample deposition using a quartz-crystal microbalance sensor with internal calibration by gravimetric determination of the sample mass loss. The apparatus was tested with anthracene and 1,3,5-triphenylbenzene and subsequently used for the study of sublimation behavior of several proteinogenic amino acids. Their low volatility and thermal instability strongly limit possibilities of studying their sublimation behavior and available literature data. The results presented in this work are unique in their temperature range and low uncertainty required for benchmarking theoretical studies of sublimation behavior of molecular crystals. The possibility of dimerization in the gas phase that would invalidate the effusion experiments is addressed and disproved by theoretical calculations. The enthalpy of sublimation of each amino acid is analyzed based on the contributions in two hypothetical sublimation paths involving the proton transfer in the solid and in the gas phase.