NMR methods for studying soft materials: application to eletroluminescent polymers and intercalation nanocomposites

• Grant number: 08/11675-0
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: May 01, 2009
• End date: September 30, 2013
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Eduardo Ribeiro de Azevedo
• Grantee: Márcio Fernando Cobo
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 07/08688-0 - Electronic and optoelectronic polymer devices, AP.TEM

Abstract

The aim of this project is to use, develop, and adapt Nuclear Magnetic Resonance (NMR) techniques for studying structural and dynamic features of polymer-based systems. Concerning the method development we plan: i) to adapt some pulse sequences for efficiently studying molecular dynamics on solid luminescent polymers; ii) to develop an experimental apparatus for simultaneously executing low filed NMR and optical spectroscopy, in particular Raman spectroscopy. The later experiment is particularly important in the study of luminescent polymers because it may provide a direct correlation between dynamics (measured by NMR) and chain conformation (measure by Raman spectroscopy). Besides the method development, this doctorate project also comprises specific NMR studies on some systems of interest, which includes the study of phase transitions in luminescent polymers and the elucidation of structural and dynamic features in soft polymers as well as in intercalation nanocomposites, with the aim o understand features o interest for the rheology of these materials. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

COBO, MARCIO FERNANDO; REICHERT, DETLEF; SAALWAEHTER, KAY; DEAZEVEDO, EDUARDO RIBEIRO. A double-component Anderson-Weiss approach for describing NMR signals of mobile SIn units: Application to constant-time DIPSHIFT experiments. JOURNAL OF MAGNETIC RESONANCE, v. 248, p. 115-125, NOV 2014. (08/11675-0, 09/18354-8)

FILGUEIRAS, JEFFERSON G.; DA SILVA, UILSON B.; PARO, GIOVANNI; D'EURYDICE, MARCEL N.; COBO, MARCIO F.; DEAZEVEDO, EDUARDO R.. Dipolar filtered magic-sandwich-echoes as a tool for probing molecular motions using time domain NMR. JOURNAL OF MAGNETIC RESONANCE, v. 285, p. 47-54, DEC 2017. (08/11675-0, 09/18354-8)

COBO, MARCIO FERNANDO; ACHILLES, ANJA; REICHERT, DETLEF; DEAZEVEDO, EDUARDO RIBEIRO; SAALWAECHTER, KAY. Recoupled separated-local-field experiments and applications to study intermediate-regime molecular motions. JOURNAL OF MAGNETIC RESONANCE, v. 221, p. 85-96, AUG 2012. (08/11675-0, 09/18354-8)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

COBO, Márcio Fernando. Exploration of dipolar NMR methods and analytical approximations to study reorientations of molecular segments. 2013. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) São Carlos.