Evaluation of 1H Time domain NMR methods for cryoporosimetry experiments

• Grant number: 22/03724-9
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2022
• End date: December 31, 2022
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Eduardo Ribeiro de Azevedo
• Grantee: Bruno Trebbi
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

1H domain nuclear magnetic resonance (TD-NMR) techniques experienced great development for the characterization of porous media in the last years. Based on different physical principles, the method is capable of estimating pore dimensions from the nanometer scale (nm) to hundreds of micrometers (¼m). While pores with dimensions in the range of hundreds of nm to tens of ¼m can be characterized by various TD-NMR methods based on relaxation times and molecular diffusion, pores with dimensions ranging from tens to hundreds of nm can be characterized using the so-called NMR cryoporosimetry. NMR cryoporosimetry probes variations in the melting temperatures of fluids confined in nanometric spaces using different TD-NMR methods. The characterization of nanoporous materials finds applications in different types of systems such as biomasses, and nanostructures for absorption of heavy metals among others. This scientific initiation project involves the implementation, testing, and characterization of the standard spin echo technique used for NMR cryoporosimetry by NMR using (usually referred to as Hahn echoes), as well as the evaluation of dipolar echoes-based techniques, which have been shown to be quite efficient to probe dynamic processes. Since the realization of the project involves the understanding of concepts of electromagnetism and quantum mechanics (NMR principle and techniques) and thermodynamics (phase transitions in confined fluids) the IC project can contribute significantly to student formation in Physics.(AU)