Laser scanning confocal microscopic analysis of metakaolin-based geopolymers

Jonathan L. Bell, Waltraud M Kriven, Angus P R Johnson, Frank Caruso

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Laser scanning confocal microscopy (LSCM) is a microscopy technique that has the capability of transmitting light through thin sections of material, to visualize a 2-dimensional plane of the sample interior. Computer software is then used to form 3-dimensional representations of the sample from multiple 2-dimensional scans. In this study, LSCM was employed to resolve the distribution of the formed geopolymer phase and metakaolin precursors in geopolymers with varying molar ratios (M2O·Al 2O3 ·xSiO2, where x = 0, 1, 2 and M = Na+, K+, or Na/K = 1) and make correlations between the observed distributions and the degree of reaction between the two precursors. LSCM analysis agreed with results in NMR and microstructural studies presented in literature- increasing concentrations of silica and higher sodium to potassium ratios resulted in less reaction between metakaolin particles and alkalisilicate solutions. When potassium is used, the resultant microstructure consisted of finer precipitate sizes and porosity regardless of the amount of silica added. The use of LSCM allowed for a 3-D microstructural perspective of pores, unreacted metakaolin, and formed geopolymer precipitates.

Original languageEnglish (US)
Title of host publicationDevelopments in Porous, Biological and Geopolymer Ceramics - A Collection of Papers Presented at the 31st International Conference on Advanced Ceramics and Composites
Pages273-282
Number of pages10
Volume28
Edition9
StatePublished - 2008
Event31st International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
Duration: Jan 21 2007Jan 26 2007

Other

Other31st International Conference on Advanced Ceramics and Composites
CountryUnited States
CityDaytona Beach, FL
Period1/21/071/26/07

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Laser scanning confocal microscopic analysis of metakaolin-based geopolymers'. Together they form a unique fingerprint.

  • Cite this

    Bell, J. L., Kriven, W. M., Johnson, A. P. R., & Caruso, F. (2008). Laser scanning confocal microscopic analysis of metakaolin-based geopolymers. In Developments in Porous, Biological and Geopolymer Ceramics - A Collection of Papers Presented at the 31st International Conference on Advanced Ceramics and Composites (9 ed., Vol. 28, pp. 273-282)