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ACS Nano. 2020 Mar 30. doi: 10.1021/acsnano.0c00621. [Epub ahead of print]

Diatom Frustule Silica Exhibits Superhydrophilicity and Superhemophilicity.

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Biomedical Science and Engineering Interdisciplinary Program, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
Department of Biomedical Engineering, SKKU Institute for Convergence, SungKyunKwan University (SKKU), Seobu-ro 2066, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea.
Michael Smith Laboratories, Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
JDKBIO lnc., Jeju-si, Jeju-do 63023, Republic of Korea.


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.


diatom silica; hemophilicity; hemowettability; nanoarchitecture; viscoelasticity


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