Yang R-J – TechConnect Briefs

A new Method for Paper Porosity Estimation

Yang R-J, Prof, TW

A method is proposed for estimating the porosity of paper by comparing the electric current passing through a wax-printed channel patterned on the paper surface with that passing through a hollow PDMS channel. To ensure [...]

An Integrated Optofluidic System for Two-Dimensional Focus Point Control

Chao K.-S., Lin M.-S., Yang R-J, National Cheng Kung University, TW

Recently, optical methods have been widely used for biological and chemical detection in microﬂuidic or lab-on-a-chip systems. Precise adjustment of the optical path among multiple integrated components, such as flow cytometers, optical tweezers, and molecule [...]

Using epoxy resin to fabricate a master for microfluidic devices in poly(dimethylsiloxane)

Pan Y-J, Yang R-J, National Cheng Kung University, TW

This paper presents two methods for the production of UV epoxy resin masters for the replication of PDMS-based microfluidic chips. The epoxy resin master can be either fabricated by using a negative glass template which [...]

Enhancement of micro-flow mixing using DC nonlinear electrokinetic vortices

Chen J.K., Yang R-J, National Cheng Kung University, TW

Electroosmotic flow (EOF) is a fundamental electrokinetic phenomenon which finds extensive use in wide varieties of practical biochip applications and analyses. Generally, the dielectric materials (PDMS, glass, etc.) used to construct microchips have low dielectric [...]

Numerical and Experimental Investigation of Three-Dimensional Hydrodynamic Focusing in Polydimethylsiloxane (PDMS) Microchannels

Chang C-C, Yang R-J, National Cheng Kung University, TW

In this work, we have designed and fabricated a three-dimensional hydrodynamic focusing microfluidic device, as shown in Figure 1. The design of the device is modified from that of a previous study [1], which comprises [...]

Electrokinetic and Hydrodynamic Focusing/Switching in Microfluidics

Yang R-J, Chang C-C, Huang S-B, Lee G-B, National Cheng Kung University, TW

This paper presents an investigation on hydrodynamic/electrokinetic focusing and switching, which are crucial for microfluidic applications. The hydrodynamic/electrokinetic focusing phenomenon is first theoretically modeled by employing a potential flow theory, and this simple theoretical model [...]