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RESEARCH PRODUCT
Calcium Sulfate Nanoparticles with Unusual Dispersibility in Organic Solvents for Transparent Film Processing
Wolfgang SchärtlWolgang TremelSergi Plana-ruizSergi Plana-ruizMihail MondeshkiSebastian LeukelMartin Panthöfersubject
Materials sciencePrecipitation (chemistry)NanoparticleInfrared spectroscopy02 engineering and technologySurfaces and Interfaces010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciences0104 chemical scienceslaw.inventionBassaniteChemical engineeringlawElectrochemistryParticleGeneral Materials ScienceCrystalliteCrystallizationFourier transform infrared spectroscopy0210 nano-technologySpectroscopydescription
Calcium sulfate is one of the most important construction materials. Today it is employed as high-performance compound in medical applications and cement mixtures. We report a synthesis for calcium sulfate nanoparticles with outstanding dispersibility properties in organic solvents without further functionalization. The nanoparticles (amorphous with small γ-anhydrite crystallites, 5–50 nm particle size) form long-term stable dispersions in acetone without any sign of precipitation. 1H NMR spectroscopic techniques and Fourier-transform infrared spectroscopy (FTIR) reveal absorbed 2-propanol on the particle surfaces that induce the unusual dispersibility. Adding water to the nanoparticle dispersion leads to immediate precipitation. A phase transformation to gypsum via bassanite was monitored by an in situ kinetic FT-IR spectroscopic study and transmission electron microscopy (TEM). The dispersibility in a volatile organic solvent and the crystallization upon contact with water open a broad field of applicat...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-05-31 | Langmuir |