casting_pdms

casting_pdms - Harvard-MIT Division of Health Sciences and...

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Casting PDMS When we cast microfluidic devices in PDMS, we are dealing with structures that have very small feature sizes. In this class, the feature sizes are on the order of 25-50 micrometers, but many microfluidic devices have even smaller features. To ensure that our devices have the correct structures, it is important to have a thoroughly clean master. The first step in this process is washing the master. After getting the master wet, it should be cleaned with soap and then rinsed in tap water (note: this applies to the plastic masters only; silicon masters must be treated more gently). After washing the master, it should go through several rinse stages. First, rinse it with deionized (DI) water. This removes residue left behind by the tap water. Harvard-MIT Division of Health Sciences and Technology HST.410J: Projects in Microscale Engineering for the Life Sciences, Spring 2007 Course Directors: Prof. Dennis Freeman, Prof. Martha Gray, and Prof. Alexander Aranyosi
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Next, it should be rinsed with isopropyl alcohol. This step picks up oils and other debris that can affect the casting.
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The master should then quickly be dried with pressurized air, either from an air canister as shown here or from a central air pump.
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casting_pdms - Harvard-MIT Division of Health Sciences and...

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