Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 9, Issue 2, Pages 275-281Publisher
SPRINGER
DOI: 10.1007/s11051-006-9149-7
Keywords
Vickers hardness; gypsum; nanoparticles; compaction; construction material; nano-needle; nanocomposites
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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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