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Surface micro-channel with self-transporting ability based on laser modification of wettability on silica glass

Research Project

Project/Area Number 26820020
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Production engineering/Processing studies
Research InstitutionTokyo Institute of Technology

Principal Investigator

Aono Yuko  東京工業大学, 大学院理工学研究科, 助教 (20610033)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords表面処理 / レーザ改質 / 微細流路 / 液滴自己輸送 / 濡れ性 / レーザ加工 / 液滴制御
Outline of Final Research Achievements

Local wettability of silica surface is modified by laser irradiation. The silica surface has hydrophobicity with particular terminal functional groups, which are decomposed by thermal treatment. Laser irradiation can control the number of decomposed groups according to the laser conditions. XPS analysis confirms that the number of groups corresponds to wettability; the contact angle on the modified surfaces range from 100 to 40°. The modification is achieved without causing any cracks or damages to the surface, as observed by SEM and AFM; moreover, transparency to visible light remains unaffected.
The proposed method is applied to plane flow channel systems. Dropped water spreads only on the hydrophilic and invisible modified line, which indicates that the line can act as a channel. Furthermore, self-transportation of liquid is also demonstrated on a channel with gradually-varied wettability along its length. A water droplet is self-transported without any actuators or external forces.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (5 results)

All 2016 2015

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Acknowledgement Compliant: 2 results) Presentation (3 results) (of which Invited: 1 results)

  • [Journal Article] Non-textured laser modification of silica glass surface: wettability control and flow channel formation2016

    • Author(s)
      Yuko Aono, Atsushi Hirata, Hitoshi Tokura
    • Journal Title

      Applied Surface Science

      Volume: 371 Pages: 530-537

    • DOI

      10.1016/j.apsusc.2016.03.040

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Laser Modification of Silicon and Borosilicate Glass Wettability for Micro-Fluidic Systems2015

    • Author(s)
      Yuko Aono, Wataru Shinohara, Hitoshi Tokura
    • Journal Title

      International Journal of Automation Technology

      Volume: 9 Issue: 6 Pages: 668-673

    • DOI

      10.20965/ijat.2015.p0668

    • NAID

      130007673920

    • ISSN
      1881-7629, 1883-8022
    • Year and Date
      2015-11-05
    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] レーザ照射による高機能表面の創製2015

    • Author(s)
      青野祐子,平田敦,戸倉和
    • Organizer
      第1回日本機械学会イノベーション講演会(iJSME2015)
    • Place of Presentation
      広島大学
    • Year and Date
      2015-11-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] レーザ照射による石英表面の官能基制御2015

    • Author(s)
      青野祐子,平田敦,戸倉和
    • Organizer
      日本機械学会2015年度年次大会
    • Place of Presentation
      北海道大学
    • Year and Date
      2015-09-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] Si/SiO2のレーザー表面改質による液滴制御法2015

    • Author(s)
      青野祐子,平田敦,戸倉和
    • Organizer
      レーザー学会学術講演会第35回年次大会
    • Place of Presentation
      東海大学
    • Year and Date
      2015-01-11 – 2015-01-12
    • Related Report
      2014 Research-status Report
    • Invited

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Published: 2014-04-04   Modified: 2017-05-10  

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