Highly water-repellent nanostructure on quartz surface based on cassie-baxter model with filling factor

Daisuke Ohori, Sou Takeuchi, Masahiro Sota, Teruhisa Ishida, Yiming Li, Jenn Hwan Tarng, Kazuhiko Endo, Seiji Samukawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We fabricated a highly water-repellent quartz nanopillar (NP) structure to investigate the effect of varying the contact angle (CA) by using 10-nm-order gaps and 10-nm-diameter NPs. Gaps from 15 to 30 nm led to CAs of more than 100°, showing hydrophobicity, to a maximum of 105°. The mechanism of repelling water on quartz could be explained by the Cassie-Baxter model with a filling factor. A gap of more than 30 nm fills with water due to capillarity, but a gap of less than 30 nm causes water to be repelled by air. We were able to repeatedly fabricate a quartz NP structure with a controllable gap by using a combination of a bio-template and neutral-beam etching and found this structure to be highly water-repellent. The structure has high durability and optical transparency. As a result, we conclude that it can be used in sensors and lenses on various devices such as cameras and radars.

Original languageEnglish
Article number2980629
Pages (from-to)1-5
Number of pages5
JournalIEEE Open Journal of Nanotechnology
Volume1
Issue number1
DOIs
Publication statusPublished - 2020

Keywords

  • Bio-template
  • Neutral beam etching
  • Quartz nanopillar
  • Water-repellent nanostructure

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

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