A novel micropump is proposed for delivering liquid with constant flow rates of 0∼250 nl/s continuously. The liquid is pumped by the surface transpiration in a micro evaporator, which consists of a gradient capillary surface by microfabricating micropost arrays. The micropost arrays are patterned such that the gaps between microposts reduce gradually away from the center microwell to surface edge, by which a capillary force formed to pull the liquid spreading on the evaporator surface. The simple analytical model is proposed to obtain the primary characteristics of the micropump, by which the influences of geometric parameters and the contact angle of fluid on the flow rate, and also the corresponding parameters during the operation of micropump are analyzed in detail. The most striking feature of the micropump is that it can be precisely and simply controlled only by varying the surface wall temperature. A much linear relationship between the flow rate and solid wall temperature can be achieved by the present design. Other features of this novel micropump include its simplicity, no-moving-parts, and ease of controlling the temperature of biological samples. The present micropump concept may be potentially used in delivering a precisely-controlled, continuous flow rate for many new applications in the fields of biotechnology, environmental testing, and instrumentation for analytical chemistry.
Skip Nav Destination
2007 First International Conference on Integration and Commercialization of Micro and Nanosystems
January 10–13, 2007
Sanya, Hainan, China
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4265-7
PROCEEDINGS PAPER
Conceptual Analysis of an Evaporation-Based Micropump Consisting of a Gradient-Capillary Microstructure Surface Available to Purchase
Xiao-Ze Du,
Xiao-Ze Du
North China Electric Power University, Beijing, China
Search for other works by this author on:
T. S. Zhao
T. S. Zhao
Hong Kong University of Science and Technology, Hong Kong, China
Search for other works by this author on:
Xiao-Ze Du
North China Electric Power University, Beijing, China
T. S. Zhao
Hong Kong University of Science and Technology, Hong Kong, China
Paper No:
MNC2007-21099, pp. 319-327; 9 pages
Published Online:
June 8, 2009
Citation
Du, X, & Zhao, TS. "Conceptual Analysis of an Evaporation-Based Micropump Consisting of a Gradient-Capillary Microstructure Surface." Proceedings of the 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. First International Conference on Integration and Commercialization of Micro and Nanosystems, Parts A and B. Sanya, Hainan, China. January 10–13, 2007. pp. 319-327. ASME. https://doi.org/10.1115/MNC2007-21099
Download citation file:
7
Views
Related Proceedings Papers
Related Articles
A Novel Way to Control Wall Temperature Distribution by Grading Blowing Rate
J. Heat Mass Transfer (March,2023)
Related Chapters
Summary and future direction
Nanomaterials in Glucose Sensing: Biomedical & Nanomedical Technologies - Concise Monographs
Introduction
Bacteriophage T4 Tail Fibers as a Basis for Structured Assemblies
General Considerations
Process Piping: The Complete Guide to ASME B31.3, Fourth Edition