microvalve – TechConnect Briefs

One-step White Blood Cell Separation from Whole Blood

Park J.M., Kim B.C., Lee J-G, Samsung Advanced Institute of Technology (SAIT), KR

Isolation of White Blood Cells (also called “WBC”) from whole blood is a first very important step for many in vitro assays. One currently accepted technique for WBC separation, referred to as the conventional manual [...]

Multifunctional Microvalves Control by Optical Illumination on Nanoheaters and its Application in Centrifugal Microfluidic Devices

Park J.M., Cho Y-K, Lee B-S, Lee J-G, Lee B-S, Lee J-G, Ko C., Samsung Advanced Institute of Technology, KR

We report ultrafast control of phase-change based microvalves utilizing nanoheaters; ferronanoparticles dispersed in paraffin wax, and heating by optical illumination using a 808 nm laser diode. High speed camera images showed that the actual response [...]

Computational Modeling of a Piezoelectrically Actuated Microvalve for the Control of Liquid Flowrate

Saeidi S.M., Khodadadi J.M., Johnson C.A., Lee C., Yang E.H., Auburn University, US

Computational modeling of liquid flow in a piezoelectrically actuated microvalve is discussed. A 3-D structured mesh with 330,000 hexahedral cells that represents the major features of the microvalve was generated for the numerical model. Due [...]

A Low Cost Polymer Based Piezo-Actuated Micropump for Drug Delivery System

Liu H., Tay A.A.O., Wan S.Y.M., Lim G.C., Institute of Materials Research & Engineering, SG

This paper presents the design, realization and simulation of a novel polymer based check-valve micropump actuated by piezoelectric disc. Comparing with silicon substrate, polymer materials have such advantages as flexibility, chemical and biological compatibility, 3D [...]

Microvalve Analysis: Wall Shear and Diffuser Effects

Carmona M., Marco S., Samitier J., Acero M.C., Plaza J.A., Esteve J., University of Barcelona, ES

This work deals with the analysis of silicon passive microvalves. The analysed microvalves consist of a circular central mass suspended by two flexible beams anchored on a pyrex substrate. The mechanical and fluidic analysis are [...]