Effect of a CNT based composite micromold on the replication fidelity during the microfabrication of polymeric microfluidic devices

RSC Advances ◽  
2014 ◽  
Vol 4 (24) ◽  
pp. 12448 ◽  
Author(s):  
R. K. Jena ◽  
C. Y. Yue ◽  
K. X. Yun
Keyword(s):  
Microfluidic Devices ◽  
Replication Fidelity ◽  
Polymeric Microfluidic

Tolerance Variation and Passive Alignment in Modular, Polymer Microfluidic Devices

2006 ◽  
Author(s):  
Byoung Hee You ◽  
Daniel S. Park ◽  
Christopher W. Mock ◽  
Wilfredo M. Caceres ◽  
Dimitris E. Nikitopoulos ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Microfluidic Devices ◽  
Mold Surface ◽  
Injection Point ◽  
Replication Fidelity ◽  
Commercial Package ◽  
Assembly Features ◽  
Injection Molded ◽  
Successful Replication ◽  
Passive Alignment

Simulations and experiments to assess the predictability of dimensional and locational tolerances of passive alignment structures on injection molded microfluidic components were performed. A center-gated disk with microscale assembly features, to aid metrology, was reproduced using injection molding. The feature dimensions were 100, 200, 300, and 400 μ. Dimensions of the features were measured using optical profilometery and optical microscopy. Simulations using a commercial package overestimated replication fidelity. Mold surface temperatures and injection speeds significantly affected the replication fidelity as the ratio of surface area to volume increased. The location of better replication fidelity, at each mold surface temperature, moved from the edge of the mold cavity to the injection point as the mold surface temperature increased from 100°C to 150°C. Therefore, process parameters and the design of a mold have to be considered for successful replication of the features.

Microfabrication (Hot-Embossing) of COC Microfluidic Devices: Effect of Norbornene Content on Replication Fidelity and Surface Modification by UV-Photografting

2013 ◽  
Vol 543 ◽  
pp. 51-54
Author(s):  
Rajeeb Kumar Jena ◽  
Chee Yoon Yue
Keyword(s):  
Surface Modification ◽  
Microfluidic Devices ◽  
Processing Parameters ◽  
Hot Embossing ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Experimental Conditions ◽  
Water Contact ◽  
Replication Fidelity ◽  
Modified Surface

The fabrication of polymer based microfluidic devices using the hot embossing technique and their surface modification for easy fluid flow through the devices has been a growing field of research. During hot embossing, the replication fidelity on polymer substrate not only depends on the processing parameters such as temperature, pressure and time but also on their chemical structure which affects their thermo-dependent viscoelastic properties. For copolymers such as cyclic olefin copolymer (COC) which comprises ethylene and norbornene units, such properties depend on their relative ethylene and norbornene content. We report in this paper, a systematic study of replication fidelity and surface modification on COC polymer with varying norbornene content from 65 to 82 wt%. Replication fidelity which includes the surface morphology and cross-section profiles of the microchannel were characterized using SEM and Confocal microscope respectively. The modified surface was evaluated using Fourier transform infrared spectroscopy (FTIR spectroscopy) and water contact angle measurement. It was observed that in hot embossing, higher norbornene content contributed to good replication fidelity at identical experimental conditions. Furthermore, it was observed that with increase in norbornene content, the grafting efficiency decreases resulting in poor surface modification.

scholarly journals Rapid and inexpensive fabrication of polymeric microfluidic devices via toner transfer masking

Lab on a Chip ◽  
2009 ◽  
Vol 9 (8) ◽  
pp. 1119 ◽  
Author(s):  
Christopher J. Easley ◽  
Richard K. P. Benninger ◽  
Jesse H. Shaver ◽  
W. Steven Head ◽  
David W. Piston
Keyword(s):  
Microfluidic Devices ◽  
Polymeric Microfluidic

Design and Simulation of a Novel Check Valve Made by SU-8

2012 ◽  
Vol 479-481 ◽  
pp. 2271-2274
Author(s):  
Tai Guo ◽  
Cong Chun Zhang ◽  
Gui Fu Ding
Keyword(s):  
Maximum Stress ◽  
Check Valve ◽  
Lab On A Chip ◽  
Microfluidic Devices ◽  
Maximum Deflection ◽  
Functional Material ◽  
Membrane Layer ◽  
Mems Technology ◽  
Simulation Results ◽  
Polymeric Microfluidic

In this paper, we describe the design, simulation of a novel check valve suitable for potentially embedding in polymeric microfluidic devices such as micro-pumps. Using SU-8 as functional material, the check valve can be fabricated by MEMS technology, such as, UV-LIGA and electroforming. The check valve mainly consists of two structural layers: inlet layer and valve membrane layer. From simulation, the maximum deflection of check valve membrane is 116μm under pressure of 2000Pa, and the maximum stress is 18.1MPa. We consider the fit thickness of valve membrane is 20μm. Simulation results demonstrate that this novel check valve can be potentially integrated in many micro-pumps and other lab-on-a-chip systems.

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