low-cost microreactor development by ali alhamadah, alex najdek, and michael ong
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Low-Cost Microreactor Development By Ali Alhamadah, Alex Najdek, and Michael Ong Oregon State University School of Chemical, Biological, and Environmental Engineering. Screenprinting. Expose photo emulsion. What is a microreactor ?. Etch slide in NH 4 HF 2. Create patterns on transparency. - PowerPoint PPT PresentationTRANSCRIPT
Low-Cost Microreactor DevelopmentBy Ali Alhamadah, Alex Najdek, and Michael Ong
Oregon State UniversitySchool of Chemical, Biological, and Environmental Engineering
What is a microreactor?
Masks
Screenprinting
A reactor with flow channel dimensions less than 1 millimeter, also called microchannels.
Microchannels provide stability to reactions which are unstable at normal conditions, making many chemical processes cheaper and safer.
Developing a low-cost fabrication procedure would provide students more learning opportunities with reactors.
• Develop a process to manufacture low-cost microreactors.
• Investigate different methods and materials for creating high-resolution microchannels.
• Final cost of no more than $8.00 per reactor.
• Create patterns using Diazo photo emulsion Instead of Yudu sheets.• Curing time of 6 min.• Technique is key!
Slides bonded using calcium assisted technique. Calcium creates a bridge between the glass slides.
Chemical Injection Site
Microscope Slide
Etched Micro Channel
Mixing Junction Outlet
Patterns
Screenprinter (Yudu)
Squeegee
References• Cong, H., Pan, T., Photopatternable Conductive PDMS Materials for
Microfabrication, Advanced Functional and Materials• Varin et al. Exploration of low-cost implementation of reactive systems
in microreactors. Oregon State University. 2009.
AcknowledgementsWe would like to thank Dr. Alex Yokochi and Dr. Phil Harding for their guidance. We would also like to thank Nicholas Au Yeung, Alex Bistrika, Kevin Caple, Andy Brickman and Manfred Dittrich for their help.
Drilling and Interconnects• Holes drilled using two drill bits
- 1/16” tungsten carbide and 3/16” diamond tipped• Constant drip of water over slides during
drilling to prevent shearing.• Epoxy luer locks into place.
Microreactor Development
Create patterns on
transparency
Drill interconnects in cover slip
Screenprint gloss enamel paint
Etch slide in NH4HF2
Expose photo emulsion
Epoxy luer lock interconnects
Test reactor with conductivity
probe
Bond slides using calcium assisted
technique
Bonding
Mask Stayed Adhered to submerged
glass in etch bath
Produced a clear screenprinted
pattern
Polyurethane paint Yes No
Acrylic paint No YesOutdoor latex paint No Yes
Candle wax Yes NoPDMS Yes No
High gloss enamel pain
Yes Yes
Diazo photo emulsion
No Yes
Goals