Ion-polymer interaction analysis: An inversion of NMR spin echo experimental data

Rita C.O. Sebastião, João P. Braga, Luciano S. Virtuoso, Karla A.S. Karla, Carlos N. Pacheco, Luis H.M. da Silva

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A methodology for ion-polymer interaction estimation is discussed in the present work. This method is based on the inversion of experimental spin echo NMR data using Hopfield neural network to retrieve transverse relaxation time distributions. The adopted model systems consist of aqueous solutions of poly (ethylene oxide), molar mass 1500, 4000 and 35000 g mol-1 and sodium nitroprusside (NP) at different concentrations. Dipolar interaction is investigated in this work through the reduction in the transverse relaxation time and increase in the area under the distribution curves of the PEO protons which presented a linear correlation with the NP concentration. Neural network results were compared with the Simplex optimization procedure and experimental NMR values. The proposed methodology is robust, stable, non restrictive in relation to the system and more efficient to handle experimental data.

Original languageEnglish (US)
Pages (from-to)423-428
Number of pages6
JournalBrazilian Journal of Physics
Volume40
Issue number4
DOIs
StatePublished - Dec 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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