Full Content is available to subscribers

Subscribe/Learn More  >

Droplet Manipulation Over a Hydrophobic Surface With Roughness Patterns

[+] Author Affiliations
Jia-Hui Chen, Jing-Tang Yang, Ker-Jer Huang

National Tsing Hua University, Hsinchu, Taiwan

Chih-Sheng Yu, Joseph Yih-Chiuen Hu

National Science Council, Hsinchu, Taiwan

Paper No. HT-FED2004-56472, pp. 477-484; 8 pages
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 4
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4693-8 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME


A novel concept is proposed to manipulate droplets without external power sources in this study. The proposed device is a hydrophobic surface containing specific roughness gradients, which is composed of several textured regions with gradually increased structural roughness. Four types of hydrophobic materials, AZ6112, Teflon, Parylene C, and plasma polymerization fluorocarbon film (PPFC), are adopted to fabricate the textured surfaces and tested. Actuating forces come from the different Laplace pressures exerting on a droplet across different hydrophobic surfaces, whereas dragging forces come from the contact angle hysteresis. Two patterns of devices are shown in this article, the chain-shaped and the concentric circular. The former functions as a droplet transporting route and the latter provides both transporting and orientation functions. Theoretical estimation and experimental verification of the droplet motion, including actuation and drag forces, on the device are conducted. Optimal design will be achieved based on accurate estimations of the acting forces. The proposed device provides a simpler fabrication process and shows better biocompatibility for droplet manipulation in microfluidic systems.

Copyright © 2004 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In