Photobleaching absorbed Rhodamine B to improve temperature measurements in PDMS microchannels.
Rhodamine B based fluorescence thermometry is commonly used in microfluidics to measure fluid temperatures in microchannels. Notable absorption of Rhodamine B into PDMS channel walls, however, causes difficulties in obtaining accurate temperature measurements due to a steady increase in the overall fluorescent signal. A simple and effective technique is reported that removes the fluorescent signal from absorbed Rhodamine B dye by means of photobleaching with a high intensity light source before taking images for thermometry analysis. The temperature field at the convergence of hot and cold streams in a Y-channel fabricated in PDMS/glass microfluidic chip is studied to demonstrate the execution of the photobleaching technique.
Glawdel
Tomasz
T
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Canada.
Almutairi
Zeyad
Z
Wang
Shuwen
S
Ren
Carolyn
C