20210326 3Dcell labnotes
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Revision as of 17:24, 26 March 2021 by Dagkd@uio.no (talk | contribs)
Pressure control of gel
- Set up gel preparation for small amounts of agarose gel (~0.5 ml)
- For other gels this can work with even smaller amounts of fluid
- When gel is ready the pressure input (needle) and fluid output (tube) is glued to gas tighten with UV glue
- Small ID tubing assures little waste of gel
- Even 3 mbar is enough to flow gel through chip.
- Changing which channel has higher pressure (by 2-3 mbar) reverses the flow of gelling fluid
- Nice control and it will work when circuit is more hydrophobic!
- Main problems:
- I had forgotten to sharpen tube (since hole was very small)
- Difficult to know how long it takes for fluid to reach chip. Fill tube before plugging in chip to have control of when it happens
- Accidental fluid into chip when I pressed tube in. Go to 0 pressure (and perhaps 3 mbar counterpressure) to avoid accidentaly filling
- Circuit was not sufficiently hydrophobic
- There should have been 2-3 posts at end of lamellae to make the difference in capillary pressure greater and avoid breaking through to the wrong side