On the deposition and polymorphism of CaCO_3 crystals in the presence of the tetrapod-shaped ZnO nanomaterials and polydimethylsiloxane composite

IR (HANDLE) Research Data 1 References Open Access
  • Yamamoto, Natsuki
    Cooperative Program for Resources Engineering, Graduate School of Engineering, Kyushu University
  • Kioka, Arata
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • Yamada, Yasuhiro
    Cooperative Program for Resources Engineering, Graduate School of Engineering, Kyushu University Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University

Description

The calcium carbonate (CaCO_3) scale generated in water pipes and heat exchangers causes serious problems such as pipe blockage and corrosion. This study investigates the effect of the 4-to-10 μm-long and 350-to-700 nm centering-nucleus-wide ZnO tetrapod-like nanomaterials and polydimethylsiloxane composite (t-ZnO/PDMS) on deposition and polymorphism of CaCO_3 crystals on the stainless-steel substrate. The results showed that the t-ZnO/PDMS coating inhibited CaCO_3 depositions and represented an excellent antifouling coating. The weight-based inhibition efficiencies of CaCO_3 deposition were up to 81.3% and 63.2% at 20 °C and 60 °C, respectively. The t-ZnO/PDMS coating also exhibited good inhibition in the presence of liquid flow. The inhibition is primarily because the very fine concave-convex microstructure of the t-ZnO/PDMS coated surface lowered the surface energy of the substrates, making it difficult for CaCO_3 crystals to adhere to the surface. Also, metastable vaterite and aragonite precipitations were dominant in the t-ZnO/PDMS coated coupons at 20 °C and 60 °C, respectively, whereas the uncoated coupon exhibited calcite as the predominant polymorph in all the studied conditions. The t-ZnO/PDMS composite subject to the liquid flow made calcites distorted and framboidal vaterite aggregates, likely due to their mechanical effects. The inhibition of CaCO_3 depositions is due to achieving hydrophobicity on substrate surfaces, changing preferential polymorph formation, and tailoring the morphology of the given polymorph by the t-ZnO/PDMS composite.

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Details 詳細情報について

  • CRID
    1050298532703266048
  • ISSN
    26668459
  • HANDLE
    2324/6795102
  • Text Lang
    en
  • Article Type
    journal article
  • Data Source
    • IRDB
    • OpenAIRE

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