SANS investigation of PDMS hybrid materials prepared by gamma-irradiation

S. R. Gomes, F. M.A. Margaça, I. M. Miranda Salvado, A. N. Falcão, L. Almásy, J. Teixeira

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Gamma-irradiation from a 60Co source was used to prepare hybrid materials from a mixture of polydimethylsiloxane with tetraethylortosilicate and zirconium propoxide. The obtained materials are monolithic and transparent after drying in air. They had been previously characterized by thermal analysis, X-ray diffraction, Rutherford backscattering and elemental analysis. The present work reports a small angle neutron scattering study on a few samples of these materials to investigate their microstructure at the nanoscale. This study showed the presence of inorganic oxide regions with mass fractal structure, their size and fractal density increasing with the tetraethylortosilicate content. Although the presence of zirconium propoxide is required to obtain a stable hybrid material yet the increase in its content leads to less dense mass fractal oxide units. It was found that the structure of the oxide regions developed through a reaction-limited aggregation mechanism. The further addition of isopropanol in the sample preparation stage causes the inorganic fractal structure to extend over the whole sample.

Original languageEnglish
Pages (from-to)5166-5170
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume266
Issue number24
DOIs
Publication statusPublished - Dec 1 2008

Keywords

  • Gamma-irradiation
  • Hybrids
  • PDMS
  • SANS

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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