Abstract
Gypsums played a vital role in the building materials, and gypsum whiskers were fiber-like crystals with small diameters and high aspect ratios, which performed lightweight, high strength, and green. The traditional methods of anhydrous gypsum whiskers through high temperature mostly involve high energy consumption and have potential environmental impacts. New methods of anhydrous gypsum whiskers even nano-whiskers had faced many challenges now. In this study, acetic acid and dilute sulfuric acid formed mixed acid, and anhydrous calcium sulfate nano-whiskers were directly fabricated by calcium carbonate slurry in a microemulsion solution. After modification, the anhydrous calcium sulfate nano-whiskers were modified with organosilicon quaternary ammonium salt and ion-exchanged with fatty acid methyl ester sulfonate. The particle performed phase evolution and surface structure changes. When 1% modified calcium sulfate was added into the cement slurry, the compressive strength of the cement slurry increased at 28 d. This method pointed out a new way to develop different technologies for building materials.
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The present work is financially supported by the Innovation Group Fund Project of Hubei Province (No.2020CFA039) and the Key Research and Development Program of Hubei Province (No.2020BCA077).
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Chen, S., Liu, Q., He, X. et al. One-step synthesis of nanoscale anhydrous calcium sulfate whiskers: direct conversion of calcium carbonate by mixed acid with microemulsion method. J Nanopart Res 24, 4 (2022). https://doi.org/10.1007/s11051-021-05387-y
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DOI: https://doi.org/10.1007/s11051-021-05387-y