Abstract
The preparation of calcium sulfate by flame synthesis resulted in the continuous production of anhydrite nanoparticles of 20–50 nm size. After compaction and hardening by the addition of water, the anhydrite nanoparticles reacted to nano-gypsum which was confirmed by X-ray diffraction, diffuse reflectance IR spectroscopy and thermal analysis. Mechanical properties were investigated in terms of Vickers hardness and revealed an up to three times higher hardness of nano-gypsum if compared to conventional micron-sized construction material. The improved mechanical properties of nano-gypsum could in part be due to the presence of calcium sulfate nano-needles in the nano-gypsum as showed by electron microscopy.
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Acknowledgments
This work was financed by the ETH Zurich. The authors would like to thank Dr. F. Krumeich for transmission electron microscopy and Prof. L. J. Gaukler for SEM measuring time.
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Osterwalder, N., Loher, S., Grass, R.N. et al. Preparation of nano-gypsum from anhydrite nanoparticles: Strongly increased Vickers hardness and formation of calcium sulfate nano-needles. J Nanopart Res 9, 275–281 (2007). https://doi.org/10.1007/s11051-006-9149-7
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DOI: https://doi.org/10.1007/s11051-006-9149-7