Godin:Protocols/Multilayer PDMS: Difference between revisions
No edit summary |
No edit summary |
||
Line 16: | Line 16: | ||
*[http://en.wikipedia.org/wiki/Isopropanol Isopropanol] | *[http://en.wikipedia.org/wiki/Isopropanol Isopropanol] | ||
*Stereo microscope | *Stereo microscope | ||
*''Scotch'' tape | |||
*Pipette tip | *Pipette tip | ||
*Tweezers | *Tweezers | ||
*Polystyrene dish | *Polystyrene dish | ||
*Vacuum | |||
*Oven | *Oven | ||
*Aluminum foil | *Aluminum foil | ||
*Weighing dish | *Weighing dish | ||
*Scale | *Scale | ||
*PDMS | *[http://www.dowcorning.com/applications/search/products/Details.aspx?prod=01064291&type=PROD PDMS] | ||
*[[Godin:Protocols/Sonicator]] | *[[Godin:Protocols/Sonicator]] | ||
*[[Godin:Protocols/Spin coater]] | *[[Godin:Protocols/Spin coater]] | ||
Line 36: | Line 38: | ||
*'''Mix PDMS 7:1''' | *'''Mix PDMS 7:1''' | ||
For most devices, 80g of PDMS is sufficient to produce reasonably-sized devices. Weigh 70g of silicone elastomer base on the scale using the weighing dish, then add 10g of curing agent. Make sure to maintain the 7:1 ratio; if too much is added, add more base as required. Use a pipette tip to mix the solution for 10 min under the fume hood. Blow dry the valve master with nitrogen, and place in a polystyrene dish. Use ''Scotch'' tape to fix the wafer at the center of the dish by taping all sides. We want to prevent the wafer from floating up, or PDMS from getting under the wafer. Close the dish with the lid. | |||
*'''30 min degass''' | |||
Place | |||
*'''12 min @ 80°C''' | *'''12 min @ 80°C''' | ||
*'''Punch valve holes''' | *'''Punch valve holes''' |
Revision as of 08:36, 17 May 2011
Safety
Materials
DescriptionThis protocol details the fabrication of a 2 layer PDMS device, consisting of a valve layer (top) and channel layer (below). It is assumed that masters for respective layers have already been fabricated (see Godin:Protocols/SU-8 Master, Godin:Protocols/AZ Master). The idea is to modify the silicone elastomer base to curing agent ratio, thereby modifying PDMS elasticity. Valve Layer
For most devices, 80g of PDMS is sufficient to produce reasonably-sized devices. Weigh 70g of silicone elastomer base on the scale using the weighing dish, then add 10g of curing agent. Make sure to maintain the 7:1 ratio; if too much is added, add more base as required. Use a pipette tip to mix the solution for 10 min under the fume hood. Blow dry the valve master with nitrogen, and place in a polystyrene dish. Use Scotch tape to fix the wafer at the center of the dish by taping all sides. We want to prevent the wafer from floating up, or PDMS from getting under the wafer. Close the dish with the lid.
Place
Fluidic Layer
Device Fabrication
|