In order to test the sealing of the capillary tubing the PDMS I made a batch of PDMS with a recess in it (from a dime). Once this cured I used the UV Ozone process (@25C) to bond the PDMS to a glass microscope slide. When I arrived this morning the system was fully bound….
I wanted to update everyone on the recent attempts at the formation of the a closed flow system by bonding PDMS to our membrane chips, using capillary tubing for the inlet and outlets. Last week when we tried to preform the UV Ozone bonding it was unsuccessful. I initially thought the bonding did not occur…
This is just an update on the progress being made towards creating a closed flow cell by bonding PDMS to our membrane chips. For those who were not at the meeting on Tuesday we have successfully bonded PDMS to both glass cover slips as well as out membrane chips using the UV Ozone cleaner. Yesterday…
Yesterday afternoon I made a new batch of 10:1 (base : curing agent) PDMS and put it in the oven at 80C for two hours to allow it to cure faster (compared to the three days it takes at room temperature). Once the PDMS was cured Henry used the UV Ozone system to again try…
After posting my observed results from yesterday I came in today to find that one of the segment of the PDMS was strongly bound to the glass cover slip, so strong in fact that trying to remove it caused the cover slip to break. This result comes in response to the comment that Chris made…
I talked with Jim last Friday about a second possible dialysis system using PDMS bound to a glass cover slip. I made a batch of PDMS and let it cure at room temperature over the past few days. Jim had suggested I try bonding the PDMS to a glass cover slip using the UV/Ozone system…
Finally on Friday all the pieces came in that we ordered to connect the peristaltic pump tubing to the 238umOD capillary tubing. This is our first order, after last weeks meeting we ordered a smaller OD capillary tubing (164um) with the same 100umID. I connected all the pieces and attached the micropump to make sure…
Over the last few days I have spent some time learning the basics of the COMSOL modeling software. I have just started to understand the basics and I just wanted to show an example of what this program is capable of. Below are images of flow modeled through a “non-uniform pore”. This model assumes water…
The controls of the micropump are in units of frequency, voltage, and wave form, not in flow rates. Based on the manufacturers website they claim that the flow rate has a linear relation with voltage. I took some time to create calibration curves at two fixed frequencies (50Hz and 150Hz). I simply allowed the system…
Just wanted to let everyone know that the fused silica capillary tubing and adapter needed to connect them to the pump tubing have been ordered and should be in hopefully by Friday (Monday at the latest).