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| Content Provider | IET Digital Library |
|---|---|
| Author | Lai, Chia Chun Chung, Chen Kuei |
| Abstract | The traditional capillary mixing using a closed channel and a mixing unit without the delay valve encounters problems of backflow and clogging. Here, the polydimethylsiloxane (PDMS) mixing channel with the facile delay valve and open surface design has been demonstrated using the two-step moulding for long-term-hydrophilic capillary-pumping. The triggering of delay valve before the mixing unit is controlled by the specific channel height calculated using capillary theory. It can eliminate the problems of backflow, clogging and bubble defect. Also, the channel height in an open channel is reduced to 150 µm compared to the close one of 250 µm by numerical analysis. The CO2-laser-ablated polymethylmethacrylate (PMMA) mother mould can avoid the complicated fabrication process using photolithography and SU8 mould. Using the unique two-step PDMS moulding method can greatly diminish the defect from the laser-ablated PMMA mould for a smoother surface. The naturally hydrophobic PDMS is modified using the polyethylene glycol and O2 plasma treatment to solve the sticking problem and prolong the hydrophilicity up to 164 h and more which is tested in the contact angle aging measurement. |
| Starting Page | 1408 |
| Ending Page | 1411 |
| Page Count | 4 |
| Volume Number | 13 |
| e-ISSN | 17500443 |
| Issue Number | Issue 10, Oct (2018) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/mnl/13/10 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/mnl.2018.5067 |
| Journal | Micro & Nano Letters |
| Publisher Date | 2018-10-01 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Aerodynamics Ageing Angle of Contact Applied Fluid Mechanics Bubbles Capillarity Capillary Valve Fabrication Carbon Compounds Channel Flow Clogging CO2 CO2 Laser-ablated PMMA Mould Contact Angle Contact Angle Aging Measurement Design Engineering Engineering Material Facile Delay Valve Flow Control Flows in Ducts, Channel, And Conduits Fluid Mechanics Fluid Surface Energy Forming Processes Hydrophobic PDMS Hydrophobicity Interface Tension Lab-on-a-chip Laser Ablation Laser Material Processing Long-term-hydrophilic Capillary-pumping Mechanical Engineering Microfluidics Mixing Moulding Multiphase Flows Numerical Analysis O2 O2 Plasma Treatment Open Surface Design Oxygen Photolithography Plasma Application in Manufacturing And Material Processing Plasma Material Processing Polydimethylsiloxane Mixing Channel Polyethylene Glycol Polymer Semiconductor Technology Size 150.0 Mum Size 250.0 Mum Surface Tension Surface Treatment Time 164.0 Hour Two-step Moulding Process Valves Wetting |
| Content Type | Text |
| Resource Type | Article |
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