I have a setup where I want to move a knife like blade through a body of liquid inside a container and I want to control the blade from outside the container. Apart from using magnets to move the blade, is there any way to form a dynamic seal around the blade as it moves along the container length?
I was thinking of using two long lengths of rubber that sandwiched the 1mm blade, but I am not sure how this would hold once some pressure was added to the container, especially if the blade had an oddly shaped cross section (like sharp curves that would be hard to seal).
There is a fused silica layer at the top of the container, which is in contact with the liquid.
So I am wondering if there are any seals anyone knows of that could be used in this scenario? I'm thinking of possibly using ferrofluid as a seal at this stage.