Issue 12, 2002
From the journal:

Journal of Materials Chemistry

Solid state 1H NMR study, humidity sensitivity and protonic conduction of gel derived phosphosilicate glasses

N. J. Clayden,a   S. Esposito,b   P. Pernicec  and  A. Aronne*c  

* Corresponding authors

a School of Chemical Science, University of East Anglia, Norwich, UK

b Laboratorio Materiali del Dipartimento di Meccanica, Strutture, Ambiente e Territorio, Facoltà di Ingegneria dell'Università di Cassino, Via G. Di Biasio 43, 03043 Cassino (Fr), Italy

c Department of Materials and Production Engineering, University of Naples Federico II Piazzale Tecchio, 80125 Napoli, Italy
E-mail: anaronne@unina.it

Abstract

1H Magic Angle Spinning (MAS) NMR and 1H T1 and T1ρ relaxation times measurements were used to investigate structural aspects of gel derived glasses of composition 10P2O5·90SiO2 (10P) and 30P2O5·70SiO2 (30P), with the aim of understanding the different humidity sensitive behaviour observed for films of the same composition. The experimental evidence suggests that 10P and 30P gel samples heat treated at 100 °C have a similar POH environment while further heating causes a different structural evolution of POH units. In particular, the 30P sample heat treated at 400 °C shows a single 1H resonance while a number of resonances are seen in the 1H spectrum of the 10P sample heat treated at 400 °C. Further evidence of the different structure of 10P and 30P samples was given by the NMR relaxation times measurements, the gels were found to be heterogeneous on a nanometric scale. Domains, about 60 nm in size, related to 1H resonance in POH were evenly distributed in the matrix of both gels, only in the 10P gel also larger domains (about 700 nm) were found that can be related to 1H resonance in SiOH groups. Finally, MAS in combination with variable temperature static NMR spectra provided detailed information on the network structural features present in the 30P sample heat treated at 300 °C as well as in the 10P sample heat treated at 400 °C and allowed investigation of the dynamic processes taking place in these samples.

Graphical abstract: Solid state 1H NMR study, humidity sensitivity and protonic conduction of gel derived phosphosilicate glasses

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Article information

DOI
https://doi.org/10.1039/B205950A
Article type
Paper
Submitted
20 Jun 2002
Accepted
10 Sep 2002
First published
16 Oct 2002

J. Mater. Chem., 2002,12, 3746-3753

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Solid state 1H NMR study, humidity sensitivity and protonic conduction of gel derived phosphosilicate glasses

N. J. Clayden, S. Esposito, P. Pernice and A. Aronne, J. Mater. Chem., 2002, 12, 3746 DOI: 10.1039/B205950A

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