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Diatom Frustule Silica Exhibits Superhydrophilicity and Superhemophilicity

  • Jeehee Lee
    Jeehee Lee
    Biomedical Science and Engineering Interdisciplinary Program, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
    More by Jeehee Lee
  • Haesung A. Lee
    Haesung A. Lee
    Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
  • Mikyung Shin
    Mikyung Shin
    Department of Biomedical Engineering, SKKU Institute for Convergence, SungKyunKwan University (SKKU), Seobu-ro 2066, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
    More by Mikyung Shin
  • Lih Jiin Juang
    Lih Jiin Juang
    Michael Smith Laboratories, Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
  • Christian J. Kastrup
    Christian J. Kastrup
    Michael Smith Laboratories, Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
  • Gyung Min Go*
    Gyung Min Go
    JDKBIO lnc., Jeju-si, Jeju-do 63023, Republic of Korea
    *Email: [email protected]
    More by Gyung Min Go
  • , and 
  • Haeshin Lee*
    Haeshin Lee
    Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
    *Email: [email protected]
    More by Haeshin Lee
Cite this: ACS Nano 2020, 14, 4, 4755–4766
Publication Date (Web):March 24, 2020
Copyright © 2020 American Chemical Society

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    Abstract Image

    Special surface wettability attracts significant attention. In this study, dramatic differences in wettability are demonstrated for microparticles with the same chemical composition, SiO2. One is natural silica prepared from the diatom, Melosira nummuloides, and the other is synthetic silica. We found that surface properties of synthetic silica are hydro- and hemophobic. However, diatom frustule silica exhibits superhydrophilicity and even superhemophilicity. Interestingly, such superhydrophilicity of natural silica is not solely originated from nanoporous structures of diatoms but from the synergy of high-density silanol anions and the nanoarchitecture. Furthermore, the observation of superhemophilicity of natural silica is also an interesting finding, because not all superhydrophilic surfaces show superhemophilicity. We demonstrate that superhemowettability is a fundamental principle for developing micropowder-based hemostatic materials despite existing hemorrhaging studies using diatoms.

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    • Comparative X-ray photoelectron spectroscopy analysis between natural diatoms and diatom frustule silica; creep and recovery test showing viscoelastic behavior of diatom frustule silica (PDF)

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